Now showing items 1-20 of 71

    • 3 W Continuous-Wave Room Temperature Single-Facet Emission From Quantum Cascade Lasers Based On Nonresonant Extraction Design Approach 

      Lyakh, Arkadiy; Maulini, Richard; Tsekoun, Alexei; Go, Rowel; Pflügl, Christian; Diehl, Laurent; Wang, Qi Jie; Capasso, Federico; Patel, C. Kumar N. (American Institute of Physics, 2009)
      A strain-balanced, InP-based quantum cascade laser structure, designed for light emission at 4.6 \(\mu\)m using a new nonresonant extraction design approach, was grown by molecular beam epitaxy. Removal of the restrictive ...
    • Accounting for inhomogeneous broadening in nano-optics by electromagnetic modeling based on Monte Carlo methods 

      Gudjonson, Herman; Kats, Mikhail; Liu, Kun; Nie, Zhihong; Kumacheva, Eugenia; Capasso, Federico (Proceedings of the National Academy of Sciences, 2014)
      Many experimental systems consist of large ensembles of uncoupled or weakly interacting elements operating as a single whole; this is particularly the case for applications in nano-optics and plasmonics, including colloidal ...
    • Activation energy study of electron transport in high performance short wavelengths quantum cascade lasers 

      Pflügl, Christian; Diehl, Laurent; Lyakh, Arkadiy; Wang, Qi Jie; Maulini, Richard; Tsekoun, Alexei; Patel, C. Kumar N.; Wang, Xiaojun; Capasso, Federico (The Optical Society, 2010)
      We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond ...
    • Aligned Carbon Nanotubes as Polarization-Sensitive, Molecular Near-Field Detectors 

      Cubukcu, Ertugrul; Degirmenci, Fatih; Kocabas, Coskun; Zimmler, Mariano A.; Rogers, John A.; Capasso, Federico (National Academy of Sciences, 2009)
      Near-field scanning optical microscopes are widely used in imaging of subwavelength features in various material systems and nanostructures. For a variety of applications, polarization-sensitive near-field probes can provide ...
    • Angular Emission Characteristics of Quantum Cascade Spiral Microlasers 

      Hentschel, Martina; Belkin, Mikhail A.; Audet, Ross; Capasso, Federico (Optical Society of America, 2009)
      We perform ray and wave simulations of passive and active spiral-shaped optical microcavities, comparing our results to experimental data obtained with mid-infrared quantum cascade spiral microlasers. Focusing on the ...
    • Asymmetric Surface Plasmon Polariton Emission by a Dipole Emitter Near a Metal Surface 

      Mueller, Jan Philipp Balthasar; Capasso, Federico (American Physical Society (APS), 2013)
      We show that the surface plasmon polariton (SPP) radiation patterns of point-dipole emitters in the vicinity of a metal-dielectric interface are generally asymmetric with respect to the location of the emitter. In particular ...
    • Beam Combining of Quantum Cascade Laser Arrays 

      Lee, Benjamin; Kansky, Jan; Goyal, Anish K.; Pflügl, Christian; Diehl, Laurent; Belkin, Mikhail A.; Sanchez, Antonio; Capasso, Federico (Optical Society of America, 2009)
    • A broadband achromatic metalens for focusing and imaging in the visible 

      Chen, Wei-Ting; Zhu, Alexander Yutong; Sanjeev, Vyshakh; Khorasaninejad, Mohammadreza; Shi, Zhujun; Lee, Eric; Capasso, Federico (Springer Nature, 2018)
    • Broadband and chiral binary dielectric meta-holograms 

      Khorasaninejad, Mohammadreza; Ambrosio, Antonio; Kanhaiya, Pritpal; Capasso, Federico (American Association for the Advancement of Science (AAAS), 2016)
      Subwavelength structured surfaces, known as meta-surfaces, hold promise for future compact and optically thin devices with versatile functionalities. By revisiting the concept of detour phase, we demonstrate high-efficiency ...
    • Broadband Distributed-Feedback Quantum Cascade Laser Array Operating From 8.0 to 9.8 um 

      Lee, Benjamin G.; Zhang, Haifei; Pfluegl, Christian; Diehl, Laurent; Belkin, Mikhail A.; Fischer, Milan; Wittmann, Andreas; Faist, Jerome; Capasso, Federico (Institute of Electrical and Electronics Engineers, 2009)
      An ultra-broadband distributed-feedback quantum cascade laser array was fabricated, using a heterogeneous cascade based on two bound-to-continuum designs centered at 8.4 and 9.6 mum. This array emitted in a range over 220 ...
    • 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 ...
    • Colloidal Quantum Dots and J-Aggregating Cyanine Dyes for Infrared Photodetection 

      Osedach, Timothy (2012-12-13)
      The emergence of nanostructured semiconducting materials enables new approaches toward the realization of photodetectors that operate in the technologically important near- and short-wave infrared (NIR and SWIR) spectral ...
    • 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, ...
    • Designing large, high-efficiency, high-numerical-aperture, transmissive meta-lenses for visible light 

      Byrnes, Steven Feinman; Lenef, Alan; Aieta, Francesco; Capasso, Federico (The Optical Society, 2016)
      A metasurface lens (meta-lens) bends light using nanostructures on a flat surface. Macroscopic meta-lenses (mm- to cm-scale diameter) have been quite difficult to simulate and optimize, due to the large area, the lack of ...
    • DFB Quantum Cascade Laser Arrays 

      Lee, Benjamin G.; Belkin, Mikhail A.; Pflügl, Christian; Diehl, Laurent; Zhang, Haifei; Audet, Ross M.; MacArthur, Jim B.; Bour, David P.; Corzine, Scott W.; Höfler, Gloria E.; Capasso, Federico (Institute of Electrical and Electronics Engineers, 2009)
      DFB quantum cascade laser (DFB-QCL) arrays operating between 8.7 and 9.4 mum are investigated for their performance characteristics-single-mode selection of the DFB grating, and variability in threshold, slope efficiency, ...
    • 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. ...
    • The Effect of Intracavity Field Variation on the Emission Properties of Quantum Cascade Lasers 

      Mansuripur, Tobias S. (2016-09-14)
      A common and powerful simplification in laser physics is to ignore the spatial dependence of the intracavity field intensity, and instead replace it with its average value. This approach can elucidate many aspects of laser ...
    • Emission properties of electrically pumped triangular shaped microlasers 

      Hentschel, Martina; Wang, Qi Jie; Yan, Changling; Capasso, Federico; Edamura, Tadataka; Kan, Hirofumi (The Optical Society, 2010)
      We study the emission properties of electrically pumped triangular-shaped microlasers with rounded corners. We find no signs of directional emission for the relatively large cavities (dimension ∼ 100μm) used in our ...