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         description => protected'<p class="text-justify">Martin Brandt is a Professor at the Walter Schottky 
            Institut and at the Physik-Department of the Technische Universität München 
            in Garching, Germany. After studying physics at Universität Bonn, University
             of Oxford and TU München, he joined the group of Manuel Cardona at the Max-
            Planck-Institut für Festkörperforschung and received his Dr. rer. nat. degre
            e from Universität Stuttgart in 1992. In 1993, he was a postdoc at Xerox Pal
            o Alto Research Center supported by a Feodor Lynen fellowship of the Alexand
            er von Humboldt foundation. Also that year, Martin Brandt was awarded the Ot
            to-Hahn-Medal of the Max-Planck-Society. In 1994, he joined the Schottky Ins
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            er Professor in 2006. His work focuses on the physics and applications of do
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            d oxides. The main research tool of his group is magnetic resonance, spearhe
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            c transport measurements to increase the sensitivity of this type of spectro
            scopy. Martin Brandt has published more than 250 papers, mostly in peer-revi
            ewed journals, and holds 16 patents. He has been a member of the DFG-funded 
            Collaborative Research Centers 348, 563 and 631 and of the Research Unit 149
            3 “Diamond Materials for Quantum Applications”. Furthermore, he was initiato
            r and member of the Priority Program 1602 “New Frontiers in Sensitivity for 
            EPR Spectroscopy”. Currently, Martin Brandt is a core member of the Munich C
            enter for Quantum Science and Technology. He is a member of the editorial bo
            ard of the journal physica status solidi and has served on numerous conferen
            ce program committees, including chairing the 2016 Gordon Conference on Defe
            cts in Semiconductors.</p>' (1850 chars)
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         title => protected'Brandt Group' (12 chars)
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         description => protected'<p>Our research addresses new <strong>semiconductor materials</strong> and n
            ew <strong>spectroscopic methods</strong> for their characterization. For qu
            antum information processing, we develop new tools based on magnetic resonan
            ce which allow to manipulate and detect the spin state of quantum bits via e
            lectrical transport measurements. As qubits, we in particular study the nucl
            ear spins of ionized donors, which based on our pioneering work have been de
            monstrated to have coherence times of the order of an hour at room temperatu
            re, by far exceeding any other solid-state-based qubit system.</p>' (598 chars)
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            nd nonlinear optical properties of semiconductors and 2D materials, and our 
            ability to engineer intersubband transitions in semiconductor heterostructur
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            rudimental state of mid-IR and THz photonics technology (compared to that in
             near-infrared and visible) provides a fruitful environment for high-impact 
            research.</p>
<p>Please refer to the Research section for the list of curre
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                  shortdescription => protected'Today, we are witnessing a scientific and technological revolution in which 
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                  shortdescription => protected'In the WSI, we develop new semiconductors, catalytic assemblies, and nanosys
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                  shortdescription => protected'We aim at structuring materials down to the atomic level or to dimensions sp
                     ecific to the envisioned experiment.' (112 chars)
                  description => protected'<p>Our research in nanofabrication focuses on the precise manipulation of ma
                     terials at the atomic and molecular levels. By employing cutting-edge techni
                     ques such as electron beam lithography, atomic layer deposition, and nanoimp
                     rint lithography, we can create intricate patterns and structures with unpre
                     cedented accuracy even down to the single atom level. These techniques allow
                      us to fabricate components that are smaller, faster, and more efficient tha
                     n ever before.&nbsp;</p>
<p>Nanofabrication is a cornerstone of modern semi
                     conductor technology, enabling the creation of devices and structures at the
                      nanometer scale. The research is crucial for the advancement of various tec
                     hnologies, including micro- and nanoelectronics, photonics, energy conversio
                     n and quantum computing. We are dedicated to pushing the boundaries of nanof
                     abrication to develop innovative solutions that address the corresponding ch
                     allenges of the future.</p>
<p>At our institute, we are committed to advanc
                     ing the field of nanofabrication through interdisciplinary collaboration and
                      cutting-edge research. Our work not only contributes to the scientific comm
                     unity but also has a profound impact on industry and society. By training th
                     e next generation of scientists and engineers, we are ensuring that the inno
                     vations of today will lead to the technological breakthroughs of tomorrow.</
                     p>' (1370 chars)
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                  paragraph2 => protected'<h3>The Center for Nanotechnology and Nanomaterials</h3>
<p>The Walter Scho
                     ttky institute of the TUM operates the Center for Nanotechnologies and Nanom
                     aterials (ZNN), as a shared nanofabrication facility. Students, researchers,
                      and scholars from the greater scientific Munich area have access to state-o
                     f-the-art nanolithography and -analytic instruments for building and charact
                     erizing nanoscale electronic, optoelectronic, and photonic circuits. The nan
                     ofabrication methodologies include ebeam-, focused-ion-beam-, and helium-ion
                     -lithography.</p>' (549 chars)
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                  shortdescription => protected'In the WSI, we develop new semiconductors, catalytic assemblies, and nanosys
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                  shortdescription => protected'Photonic and optoelectronic phenomena on the nanometer scale are at the hear
                     t of fundamental science and technology. The institute explores various opto
                     electronic systems.' (171 chars)
                  description => protected'<p>Photonic and optoelectronic phenomena on the nanometer scale are at the h
                     eart of fundamental science and technology. The institute explores various o
                     ptoelectronic systems.</p>' (178 chars)
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                     title => protected'Widely-tunable room-temperature THz quantum cascade laser sources' (65 chars)
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                     shortdescription => protected'<p>THz spectral range is teeming with mainstream concepts. However, it is st
                        ill in need of a convenient and compact semiconductor source and detector te
                        chnology. In particular, THz radiation sources are bulky, complex in operati
                        on, and expensive to manufacture. Real-world applications require <i>room-te
                        mperature</i> broadly-tunable or frequency-comb THz sources that are similar
                         in operation simplicity and mass producibility to diode lasers and mid-IR q
                        uantum cascade lasers (QCLs).<br /><br />We have recently achieved significa
                        nt progress in the development of such sources [1,2]. Our devices are based 
                        on efficient frequency mixing inside of dual-wavelength mid-IR QCLs. Their a
                        ctive regions are quantum-engineered to provide a giant nonlinearity for dif
                        ference-frequency generation (DFG) with population inversion [1,2] and their
                         waveguides are designed for Cherenkov phase-matching of DFG that enables TH
                        z extraction through the substrate [3]. As a result, these devices (referred
                         to as THz DFG-QCLs) can now provide up to nearly 2 mW of peak THz power out
                        put and over 10 µW of continuous-wave THz power at room temperature [1,2]. A
                         schematic of a Cherenkov THz DFG-QLC is shown in the figure on the right.&n
                        bsp;</p>' (1224 chars)
                     description => protected'<p>A typical single mode device performance is shown in Fig. 1(a). We have a
                        lso demonstrated that THz DFG-QCL chips can be continuously tuned over nearl
                        y the entire 1-6 THz range using an external cavity setup [3-5] or in monoli
                        thic configurations [6,7], see Fig. 2(b). We have further recently confirmed
                         that, in continuous-wave operation, these devices provide a narrow (sub-MHz
                        ) emission linewidth which makes them suitable to be used as local oscillato
                        rs for heterodyne spectroscopy [8]. The THz DFG-QCL platform holds a high pr
                        omise for developing efficient broadband THz frequency comb sources for spec
                        troscopic and metrological applications.<br /><br />Our ongoing work is aime
                        d at improving the THz radiation outcouping efficiency (estimated to be belo
                        w ~5% in the current devices) [9,10], enhancing the optical nonlinearity in 
                        the QCL active regions to increase THz output power, improving device therma
                        l packaging, generating THz frequency combs, developing miniature broadly-tu
                        nable THz systems, and demonstrating compact semiconductor-based THz instrum
                        entation such as spectroscopy and imaging systems, dual-comb spectrometers, 
                        and microscopy systems.</p>' (1167 chars)
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                     paragraph2 => protected'<p class="text-center">REFERENCES</p>
<ol><li>K. Fujita, S. Jung, Y. Jiang,
                         J.H. Kim, A Nakanishi, A. Ito, M. Hitaka, T. Edamura, and M.A. Belkin, “Rec
                        ent progress in terahertz difference-frequency quantum cascade laser sources
                        ,” <i>Nanophoton.</i> <strong>7</strong>, 1795-1817 (2018).</li><li>M.A. Bel
                        kin and F. Capasso, “New frontiers in quantum cascade lasers: high performan
                        ce room temperature terahertz sources,” <i>Phys. Scr.</i> <strong>90</strong
                        >, 118002 (2015).</li><li>K. Vijayraghavan, Y. Jiang, M. Jang, A. Jiang, K. 
                        Choutagunta, A. Vizbaras, F. Demmerle, G. Boehm, M. C. Amann, and M. A. Belk
                        in, “Broadly tunable terahertz generation in mid-infrared quantum cascade la
                        sers,” <i>Nature Commun.</i> <strong>4</strong>, 2021 (2013).</li><li>Y. Jia
                        ng, K. Vijayraghavan, S. Jung, F. Demmerle, G. Boehm, M.-C. Amann, and M.A. 
                        Belkin “External cavity terahertz quantum cascade laser sources based on int
                        racavity frequency mixing with 1.2-5.9 THz tuning range,” <i>J. Opt.</i> <st
                        rong>16</strong>, 094002 (2014).</li><li>Y. Jiang, K. Vijayraghavan, S. Jung
                        , A. Jiang, J.H. Kim, F. Demmerle, G. Boehm, M.C. Amann, and M.A. Belkin, “S
                        pectroscopic study of terahertz generation in mid-infrared quantum cascade l
                        asers,” <i>Sci. Rep.</i> <strong>6</strong>, 21169 (2016).</li><li>S. Jung, 
                        A. Jiang, Y. Jiang, K. Vijayraghavan, X. Wang, M. Troccoli, and M.A. Belkin,
                         “Broadly tunable monolithic room-temperature terahertz quantum cascade lase
                        r sources,” <i>Nature Commun.</i> <strong>5</strong>, 4267 (2014).</li><li>A
                        . Jiang, S. Jung, Y. Jiang, K. Vijayraghavan, J. Kim, and M.A. Belkin, “Wide
                        ly tunable terahertz source based on intra-cavity frequency mixing in quantu
                        m cascade laser arrays,” <i>Appl. Phys. Lett.</i> <strong>106</strong>, 2611
                        07 (2015).</li><li>L. Consolino, S. Jung, A. Campa, M. De Regis, S. Pal, K. 
                        Fujita, A. Ito, M. Hitaka, S. Bartalini, P. De Natale, M.A. Belkin, and M.S.
                         Vitiello, “Spectral purity and tunability of terahertz quantum cascade lase
                        r sources based on intra...' (2573 chars)
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                     title => protected'Integrated mid-infrared photonics' (33 chars)
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                     shortdescription => protected'<p>Near-infrared (wavelengths approximately in the range of 1-2.5 microns) p
                        hotonic integrated circuits (PICs) based on the silicon-on-insulator (SOI) o
                        r III-V platforms have undergone a tremendous expansion in recent years, dri
                        ven initially by applications in fiber-optics communications and optical int
                        erconnects and later expanding to beam combining and steering, chemical and 
                        biological sensing, and frequency comb generation. Near-infrared PIC systems
                         are now commercialized for several different applications by companies such
                         as Infinera, Sisco Systems, SICOYA, and many others.<br /><br />In contrast
                         to the near-infrared spectral range, mid-IR laser-based systems have so far
                         been designed around free-space optics. Integration of a semiconductor lase
                        r with a suitable mid-IR photonics platform will enable the development of m
                        id-IR PICs for a wide range of applications from spectroscopy and sensing to
                         beam steering aund ab nd new frequency generation. We have recently started
                         investigating approaches for developing mid-IR PICs using both silicon and 
                        III-V platforms.</p>' (1084 chars)
                     description => protected'<p>Figure 2(a) shows the electron microscope image of a mid-IR QCL epi-trans
                        ferred to Silicon-on-Sapphire (SOS) wafers using 250-nm-thick SU-8 epoxy as 
                        an adhesive. Efficient coupling of mid-IR light from the laser cavity to sil
                        icon waveguides was achieved using tapered QCL waveguides as shown in Fig. 3
                        (a) after Ref. [1]. Similar transfer-printing methods can be used to integra
                        te other mid-IR light sources, such as diode lasers and interband cascade la
                        sers (ICLs) with silicon waveguides.<br /><br />Hybrid mid-IR systems based 
                        on III-V laser materials transferred to silicon photonic waveguides are expe
                        cted to perform well with mid-IR diode lasers and ICLs that have relatively 
                        low (few tens of milliwatts) optical powers and thermal power dissipation. H
                        owever, long-wavelength room-temperature operation of these devices is limit
                        ed to the 5-6 microns spectral range. In addition, the use of the Si-based p
                        latforms limits the spectral range of mid-IR PICs to below 7 μm due to optic
                        al absorption in Si.<br /><br />QCLs are currently the only room-temperature
                         electrically pumped semiconductor light sources that can operate in the ent
                        ire mid-IR range (from 3 to 15 microns) with optical powers over 1 W. Given 
                        the very high thermal dissipation in QCL active regions, achieving long-term
                         reliability and continuous-wave operation of heterogeneously integrated dev
                        ices on silicon platforms is challenging. Therefore, we have recently starte
                        d working on homogeneous integration of mid-IR QCLs with low-loss III-V pass
                        ive waveguides epitaxially grown on InP substrates, see Fig. 2(b). The homog
                        eneous integration approach uses materials, growth, and processing steps nea
                        rly identical to those used for conventional high-performance mid-IR QCLs, w
                        hich offers superior reliability and performance of photonic integrated circ
                        uits. Devices integrated with III-V waveguides show more than an order of ma
                        gnitude higher output power from passive waveguides, compared to devices int
                        egrated with the SOS wav...' (2275 chars)
                     image2 => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (2 items)
                     paragraph2 => protected'<p class="text-center">REFERENCES</p>
<ol><li>S. Jung, J. Kirch, J.H. Kim, 
                        L.J. Mawst, D. Botez, and M.A. Belkin, “Quantum cascade lasers transfer-prin
                        ted on silicon-on-sapphire,” <i>Appl. Phys. Lett.</i> <strong>111</strong>, 
                        211102 (2017).</li><li>S. Jung, D. Palaferri, K. Zhang, F. Xie, Y. Okuno, C.
                         Pinzone, K. Lascola, and M.A. Belkin, “Homogeneous photonic integration of 
                        mid-infrared quantum cascade lasers with low-loss passive waveguides on InP 
                        platform,” <i>Optica</i> <strong>6</strong>, 1023-1030 (2019).</li></ol>' (528 chars)
                     institution => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (empty)
                     publications => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (empty)
                     paragraph3 => protected'' (0 chars)
                     contributors => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (empty)
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                  0000000000000d630000000000000000 => Dasoe\Wsi\Domain\Model\Topicprototypepersistent entity (uid=34, pid=79)
                     title => protected'Quantum-engineered nonlinear metamaterials' (42 chars)
                     image => protectedTYPO3\CMS\Extbase\Domain\Model\FileReferenceprototypepersistent entitymax depth (uid=415, pid=79)
                     link => protected'' (0 chars)
                     shortdescription => protected'<p>The mid-IR and THz regions are particularly suitable for creating enginee
                        red materials based on the concepts of quantum-engineering of electron state
                        s, plasmonics, and metamaterials. We have recently demonstrated the potentia
                        l of this approach by creating large-area ultrathin metasurfaces with record
                        -high nonlinear optical response. The metasurfaces operate by coupling modes
                         in electromagnetically-engineered plasmonic nanoresonators with quantum-eng
                        ineered intersubband nonlinearities in a thin semiconductor heterostructure.
                        <br /><br />Subwavelength thickness of our metasurfaces precludes phase matc
                        hing constrains associated with traditional nonlinear optical crystals and t
                        hus allows for broadband frequency conversion. Furthermore, since very low o
                        ptical intensity is required to produce strong nonlinear effects, our metasu
                        rfaces may be pumped using compact continuous-wave semiconductor lasers such
                         as QCLs or diode lasers. Continuously-pumped metasurfaces may be used, for 
                        example, to achieve self-referencing and frequency shift of low-power micror
                        esonator-based optical frequency comb sources to anywhere in mid-IR and THz,
                         to generate large amounts of THz radiation using high-power mid-IR pump las
                        ers (e.g., CO<sub>2</sub> lasers or high-power QCLs), and to up-convert mid-
                        IR and THz optical signals for focal-plane-array imaging.</p>' (1353 chars)
                     description => protected'<p>The basic schematic of the metasurface is given in Fig. 4 and its operati
                        on is explained in the figure caption. We achieved over 0.075 % of mid-IR se
                        cond-harmonic power conversion efficiency using only 15 kW/cm<sup>2</sup> of
                         pump intensity [1,2]. The second-order nonlinear susceptibility of our late
                        st metasurfaces at low pump intensity is estimated to be over 10<sup>6</sup>
                         pm/V, 4 orders of magnitude higher than that of traditional nonlinear mater
                        ials such as LiNbO3. From the fundamental standpoint, our metasurfaces provi
                        de the foundation for the “flat nonlinear optics paradigm” in which we can s
                        imultaneously produce high nonlinear conversion efficiency and achieve full 
                        control of the wavefront of the nonlinear output, as demonstrated by us in R
                        ef. [3].<br /><br />We are now investigating numerous directions in which th
                        e effective nonlinearity and conversion efficiency of the metasurfaces may b
                        e further improved, particularly, by optimizing plasmonic nanoresonator desi
                        gns to achieve higher field enhancement and higher nonlinear overlap integra
                        l [4,5] and by increasing the intersubband nonlinearity and saturation inten
                        sity of the semiconductor heterostructure using more sophisticated MQW desig
                        ns. Theoretical simulations indicate that up to 10% of power conversion effi
                        ciency is possible in fully-optimized structures using input intensities ~10
                        -100 kW/cm<sup>2</sup>. Additional ongoing and planned future research on th
                        is topic include<br /><br />&nbsp;</p>
<ul><li>Design and experimental test
                        ing of metasurfaces for THz difference-frequency generation [6];</li><li>Met
                        asurfaces for efficient up-conversion of mid-IR and THz signals for detectio
                        n and imaging;</li><li>Nonlinear metasurfaces for mid-IR and THz Raman lasin
                        g and other four-wave mixing processes such as phase conjugation and all-opt
                        ical control;</li><li>Investigating quantum effects in individual highly-non
                        linear nanoscale optical resonators [7].</li></ul>' (1950 chars)
                     image2 => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (1 items)
                     paragraph2 => protected'<p class="text-center">REFERENCES</p>
<ol><li>J. Lee, M. Tymchenko, C. Argy
                        ropoulos, P. Y. Chen, F. Lu, F. Demmerle, G. Boehm, M. C. Amann, A. Alu, and
                         M.A. Belkin, “Giant nonlinear response from plasmonic metasurfaces coupled 
                        to intersubband transitions,” <i>Nature</i> <strong>511</strong>, 65 (2014).
                        </li><li>J. Lee, N. Nookala, J. S. Gomez-Diaz, M. Tymchenko, F. Demmerle, G.
                         Boehm, M.-C. Amann, A. Alù, and M.A. Belkin “Ultrathin second-harmonic meta
                        surfaces with record-high nonlinear optical response,” <i>Adv. Opt. Mat.</i>
                         <strong>4</strong>, 664-670 (2016).</li><li>N. Nookala, J. Lee, J.S. Gomez-
                        Diaz, M. Tymchenko, F. Demmerle, G. Boehm, K. Lai, G. Shvets, M.-C. Amann, A
                        . Alù, and M.A. Belkin, “Ultrathin gradient nonlinear metasurface with a gia
                        nt nonlinear response,” <i>Optica</i> <strong>3</strong>, 283-288 (2016).</l
                        i><li>N. Nookala, J. Xu, O. Wolf, S. March, R. Sarma, S. Bank, J. Klem, I. B
                        rener, and M. A. Belkin, “Mid-infrared second-harmonic generation in ultra-t
                        hin plasmonic metasurfaces without a full-metal backplane,” <i>Appl. Phys. B
                        .</i> <strong>124</strong>, 132 (2018).</li><li>R. Sarma, D. de Ceglia, N. N
                        ookala, M. Vincenti, S. Campione, O. Wolf, M. Scalora, M. Sinclair, M. Belki
                        n and I. Brener, "Broadband and efficient second-harmonic generation from a 
                        hybrid dielectric metasurface/semiconductor quantum-well structure," <i>ACS 
                        Photon.</i> <strong>6</strong>, 1458 (2019).</li><li>M. Tokman, Z. Long, S. 
                        Al Mutairi, Y. Wang, V. Vdovin, M. Belkin, and A. Belyanin, “Purcell enhance
                        ment of the parametric down-conversion in two-dimensional nonlinear material
                        s,” <i>APL Photonics</i> <strong>4</strong>, 034403 (2019).</li><li>M. Tymch
                        enko, J. S. Gomez-Diaz, J. Lee, M.A. Belkin, and A. Alù, “Highly-efficient T
                        Hz generation using nonlinear plasmonic metasurfaces,” <i>J. Opt.</i> <stron
                        g>19</strong>, 104001 (2017).</li></ol>' (1863 chars)
                     institution => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (empty)
                     publications => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (empty)
                     paragraph3 => protected'' (0 chars)
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                  0000000000000d090000000000000000 => Dasoe\Wsi\Domain\Model\Topicprototypepersistent entity (uid=35, pid=79)
                     title => protected'Mid-infrared vertical cavity surface emitting lasers (VCSELs)' (61 chars)
                     image => protectedTYPO3\CMS\Extbase\Domain\Model\FileReferenceprototypepersistent entitymax depth (uid=416, pid=79)
                     link => protected'' (0 chars)
                     shortdescription => protected'<p>Gas sensing based on direct laser diode absorption spectroscopy is one of
                         the most sensitive and selective detection methods and it is widely used in
                         industry. Because of their geometry, vertical cavity surface emitting laser
                        s (VCSELs) are known to have significant advantages over edge-emitting diode
                         lasers, including extreme compactness, about two orders of magnitude lower 
                        power consumption (due to smaller active region volume), round (rather than 
                        elliptical) beam shape, and intrinsic single-mode operation without the need
                         for complex distributed feedback gratings used in single-mode edge-emitting
                         lasers (due to much smaller laser cavity size).<br /><br />Mid-IR spectral 
                        range is often called the ‘molecular fingerprint region’ because any chemica
                        l compound can be uniquely described by its molecular absorption fingerprint
                        . The development of continuous-wave (CW) mid-IR VCSELs is highly desired fo
                        r the creation of compact chemical sensors with high detectivity and specifi
                        city. Currently, however, such VCSELs do not exist. We are working on the de
                        velopment of CW room-temperature mid-IR VCSELs in the wavelength range 3-5 µ
                        m.</p>' (1146 chars)
                     description => protected'<p>Due to current unavailability of CW VCSELs operating in the wavelength ra
                        nge of the fundamental molecular roto-vibrational absorption lines, devices 
                        operating at shorter near-infrared (near-IR) wavelengths (often around 1550 
                        nm) are used to target the absorption lines corresponding to “overtones” (hi
                        gher-order harmonics) of fundamental molecular vibrations. However, these li
                        nes are typically about 2 orders of magnitude weaker than the fundamental ab
                        sorption lines. Figure 5(a) shows the absorption spectrum of methane display
                        ing both fundamental absorption lines around 3300&nbsp;nm and overtone lines
                         at 1550 nm and 2300 nm. Additionally, the overtone line spectrum of molecul
                        ar compounds is more complex and spectrally dense compared to the spectrum o
                        f the fundamental lines. As a result, it is often difficult to select an ove
                        rtone absorption line of a target molecule that is free from interference pr
                        oduced by overtone lines of other gases.<br /><br />Our research efforts foc
                        us on developing CW room-temperature mid-IR VCSELs operating in the 3-5 µm w
                        avelength range using InAlGaAsSb heterostructures grown on GaSb substrates. 
                        The schematic of a VCSEL structure is shown in Fig. 5(b). The Chair has prod
                        uced devices that define the current state of the art in the mid-IR VCSEL te
                        chnology, including CW VCSELs at 3 µm wavelength [1] and at 4 µm wavelength 
                        [2] with near-room-temperature operation, see Fig. 6.<br /><br />Current res
                        earch efforts are focused on improving the active region design of the devic
                        es using both type-I and type-II active region schemes, improving the mirror
                         design and the current injection aperture design in these devices, optimizi
                        ng thermal packaging and more. The development of the first CW mid-IR VCSELs
                         is also expected to lead to various opportunities in application of these d
                        evices for gas sensing and spectroscopy.</p>' (1868 chars)
                     image2 => protectedTYPO3\CMS\Extbase\Persistence\ObjectStorageprototypeobjectmax depth (2 items)
                     paragraph2 => protected'<p class="text-center">REFERENCES</p>
<ol><li>A. Andrejew, S. Sprengel, and
                         M.-C. Amann, "GaSb-based vertical-cavity surface-emitting lasers with an em
                        ission wavelength at 3 μm", <i>Opt. Lett.</i> <strong>41</strong>, 2799 (201
                        6).</li><li>G.K. Veerabathran, S. Sprengel, A. Andrejew, and M.-C. Amann, "R
                        oom-temperature vertical-cavity surface-emitting lasers at 4 μm with GaSb-ba
                        sed type-II quantum wells", <i>Appl. Phys. Lett.</i> <strong>110</strong>, 0
                        71104 (2017).</li></ol>' (479 chars)
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