Browsing by Author "Yu, Nanfang"

Now showing items 1-16 of 16

    • Coherent Coupling of Multiple Transverse Modes in Quantum Cascade Lasers 

      Yu, Nanfang; Diehl, Laurent; Cubukcu, Ertugrul; Bour, David; Corzine, Scott; Hoefler, Gloria; Wojcik, Aleksander K.; Crozier, Kenneth B.; Belyanin, Alexey; Capasso, Federico (American Physical Society, 2009)
      Quantum cascade lasers are a unique laboratory for studying nonlinear laser dynamics because of their high intracavity intensity, strong intersubband optical nonlinearity, and an unusual combination of relaxation time ...

    • Controlled Modification of Erbium Lifetime by Near-Field Coupling to Metallic Films 

      Yu, Nanfang; Belyanin, Alexey; Bao, Jiming; Capasso, Federico (Institute of Physics, 2009)
      Systematic measurements of the photoluminescence lifetime of the 1.54 μm transition of erbium implanted at different energies in SiO2 films with different metallic overlayers are reported. The lifetime shows a strong ...

    • Deformed Microcavity Quantum Cascade Lasers with Directional Emission 

      Wang, Qi; Yan, Changling; Diehl, Laurent; Hentschel, Martina; Wiersig, Jan; Yu, Nanfang; Pflügl, Christian; Edamura, Tadataka; Yamanishi, Masamichi; Kan, Hirofumi; Belkin, Mikhail A.; Capasso, Federico (Institute of Physics, 2009)
      We report the experimental realization of deformed microcavity quantum cascade lasers (QCLs) with a Limaçon-shaped chaotic resonator. Directional light emission with a beam divergence of \(\theta_{\|} \approx 33^{\circ}\) ...

    • Designer spoof surface plasmon structures collimate terahertz laser beams 

      Yu, Nanfang; Wang, Qi Jie; Kats, Mikhail A; Fan, Jonathan A.; Khanna, Suraj P.; Li, Lianhe; Davies, A. Giles; Linfield, Edmund H.; Capasso, Federico (Nature Publishing Group, 2010)
      Surface plasmons have found a broad range of applications in photonic devices at visible and near-infrared wavelengths. In contrast, longer-wavelength surface electromagnetic waves, known as Sommerfeld or Zenneck waves, ...

    • Directional Emission and Universal Far-Field Behavior from Semiconductor Lasers with Limacon-Shaped Microcavity 

      Capasso, Federico; Yan, Changling; Wang, Qi Jie; Diehl, Laurent; Hentschel, Martina; Wiesig, Jan; Yu, Nanfang; Belkin, Mikhail A.; Edamua, Tadataka; Yamanishi, Masamichi; Kan, Hirofumi; Pflügl, Christian (American Institute of Physics, 2009)
      We report experimental demonstration of directional light emission from limaçon-shaped microcavity semiconductor lasers. Quantum cascade lasers (QCLs) emitting at \(\lambda \approx 10 \mu m\) are used as a model system. ...

    • Gain competition in dual wavelength quantum cascade lasers 

      Geiser, Markus; Pflügl, Christian; Belyanin, Alexey; Wang, Qi Jie; Yu, Nanfang; Edamura, Tadanaka; Yamanishi, Masamichi; Kan, Hirofumi; Fischer, Milan; Wittmann, Andreas; Faist, Jérôme; Capasso, Federico (The Optical Society, 2010)
      We investigated dual wavelength mid-infrared quantum cascade lasers based on heterogeneous cascades. We found that due to gain competition laser action tends to start in higher order lateral modes. The mid-infrared mode ...

    • High Efficiency Near Diffraction-Limited Mid-Infrared Flat Lenses Based on Metasurface Reflectarrays 

      Zhang, Shuyan; Kim, Myoung-Hwan; Aieta, Francesco; She, Alan Jenting; Mansuripur, Tobias Siavash; Gabay, Ilan; Khorasaninejad, Mohammadreza; Rousso, David; Wang, Xiaojun; Troccoli, Mariano; Yu, Nanfang; Capasso, Federico (The Optical Society, 2016)
      A limiting factor in the development of mid-infrared optics is the lack of abundant materials that are transparent, low cost, lightweight, and easy to machine. In this paper, we demonstrate a metasurface device that ...

    • Multi-Beam Multi-Wavelength Semiconductor Lasers 

      Capasso, Federico; Yu, Nanfang; Kats, Mikhail A; Pflügl, Christian; Geiser, Markus; Wang, Qi Jie; Belkin, Mikhail A.; Fischer, Milan; Wittmann, Andreas; Faist, Jérôme; Edamura, Tadataka; Furuta, Shinichi; Yamanishi, Masamichi; Kan, Hirofumi (American Institute of Physics, 2009)
      Multibeam emission and spatial wavelength demultiplexing in semiconductor lasers by patterning their facets with plasmonic structures is reported. Specifically, a single-wavelength laser was made to emit beams in two ...

    • Nonlinear dynamics of coupled transverse modes in quantum cascade lasers 

      Wójcik, Aleksander K.; Yu, Nanfang; Diehl, Laurent; Capasso, Federico; Belyanin, Alexey (Informa UK Limited, 2010)
      We analyze the dynamics of broad-area mid-infrared quantum cascade lasers (QCLs). We show the possibility of the coherent coupling of several transverse modes which results in several interesting effects including frequency ...

    • Plasmonic Laser Antennas and Related Devices 

      Cubukcu, Ertugrul; Yu, Nanfang; Smythe, Elizabeth J.; Diehl, Laurent; Crozier, Kenneth B.; Capasso, Federico (IEEE Photonics Society, 2008)
      This paper reviews recent work on device applications of optical antennas. Localized surface plasmon resonances of gold nanorod antennas resting on a silica glass substrate were modeled by finite difference time-domain ...

    • Plasmonics for Laser Beam Shaping 

      Yu, Nanfang; Blanchard, R.; Fan, J.; Wang, Qi Jie; Pflugl, C.; Diehl, L; Edamura, T.; Furuta, S.; Yamanishi, M.; Kan, H.; Capasso, Federico (Institute of Electrical & Electronics Engineers (IEEE), 2010)
      This paper reviews our recent work on laser beam shaping using plasmonics. We demonstrated that by integrating properly designed plasmonic structures onto the facet of semiconductor lasers, their divergence angle can be ...

    • Semiconductor Lasers With Integrated Plasmonic Polarizers 

      Yu, Nanfang; Wang, Qi Jie; Pflügl, Christian; Diehl, Laurent; Capasso, Federico; Edamura, Tadataka; Furuta, Shinichi; Yamanishi, Masamichi; Kan, Hirofumi (American Institute of Physics, 2009)
      The authors reported the plasmonic control of semiconductor laser polarization by means of metallic gratings and subwavelength apertures patterned on the laser emission facet. An integrated plasmonic polarizer can project ...

    • Surface-Emitting THz Sources Based on Difference-Frequency Generation in Mid-Infrared Quantum Cascade Lasers 

      Geiser, Markus; Pfluegl, Christian J.; Belyanin, A; Wang, Qi Jie; Yu, Nanfang; Belkin, M. A.; Edamura, T; Kan, H; Fischer, M; Wittmann, A; Faist, J; Capasso, Federico (Society of Photo-optical Instrumentation Engineers, 2010)
      We report a surface-emitting THz source based on intracavity difference-frequency generation in dual-wavelength midinfrared quantum cascade lasers with integrated giant second-order nonlinear susceptibility. The THz light ...

    • Using Plasmonics to Shape Light Beams 

      Capasso, Federico; Yu, Nanfang; Cubukcu, Ertugrul; Smythe, Elizabeth (Optical Society of America, 2009)
      The field of plasmonics-in which surface plasmon resonances of metals are used to manipulate light at the sub-wavelength scale-is transforming our understanding of nanophotonics and integrated optics. Now, researchers are ...

    • Wavefront engineering for mid-infrared and terahertz quantum cascade lasers [Invited] 

      Yu, Nanfang; Capasso, Federico (The Optical Society, 2010)
      We review our recent work on beam shaping of mid-infrared (mid-IR) and terahertz (THz) quantum cascade lasers (QCLs) using plasmonics. Essentials of QCLs are discussed; these include key developments, the operating principle ...

    • Whispering-gallery mode resonators for highly unidirectional laser action 

      Wang, Q. J.; Yan, C.; Yu, N; Unterhinninghofen, J.; Wiersig, J.; Pflugl, C.; Diehl, L; Edamura, T.; Yamanishi, M.; Kan, H.; Capasso, Federico (Proceedings of the National Academy of Sciences, 2010)
      Optical microcavities can be designed to take advantage of total internal reflection, which results in resonators supporting whispering-gallery modes (WGMs) with a high-quality factor (Q factor). One of the crucial problems ...