Browsing by Author "Capasso, Federico"

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, ...