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31 Jan 2011

Volume 98, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 98, 053101 (2011); http://dx.doi.org/10.1063/1.3549154 (3 pages)

Minggang Zeng, Lei Shen, Ming Yang, Chun Zhang, and Yuanping Feng
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Generation of correlated photon pairs in a chalcogenide As2S3 waveguide

C. Xiong, G. D. Marshall, A. Peruzzo, M. Lobino, A. S. Clark, D.-Y. Choi, S. J. Madden, C. M. Natarajan, M. G. Tanner, R. H. Hadfield, S. N. Dorenbos, T. Zijlstra, V. Zwiller, M. G. Thompson, J. G. Rarity, et al.

Appl. Phys. Lett. 98, 051101 (2011); http://dx.doi.org/10.1063/1.3549744 (3 pages) | Cited 11 times

Online Publication Date: 31 January 2011

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We demonstrate a 1550 nm correlated photon-pair source in an integrated glass platform—a chalcogenide As2S3 waveguide. A measured pair coincidence rate of 80 s−1 was achieved using 57 mW of continuous-wave pump. The coincidence to accidental ratio was shown to be limited by spontaneous Raman scattering effects that are expected to be mitigated by using a pulsed pump source.
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42.79.Gn Optical waveguides and couplers
42.50.-p Quantum optics
61.43.Fs Glasses
78.30.Hv Other nonmetallic inorganics

Light absorption in textured thin film silicon solar cells: A simple scalar scattering approach versus rigorous simulation

C. Rockstuhl, S. Fahr, F. Lederer, F.-J. Haug, T. Söderström, S. Nicolay, M. Despeisse, and C. Ballif

Appl. Phys. Lett. 98, 051102 (2011); http://dx.doi.org/10.1063/1.3549175 (3 pages) | Cited 8 times

Online Publication Date: 2 February 2011

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Rigorous diffraction theory is a reliable tool to quantify the absorption enhancement in textured thin film solar cells. We provide a line of arguments that make the insights from such an involved analysis accessible to a broader community by using a scalar approach. We show that the scattering response from a textured surface as calculated by a simple scalar model can be related to the measured external quantum efficiency of a solar cell and double-check this model by rigorous calculations. This approach allows estimating the performance of a textured thin film to a certain extent without any sophisticated numerical analysis.
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88.40.jj Silicon solar cells

Experimental validation of strong directional selectivity in nonsymmetric metallic gratings with a subwavelength slit

Semih Cakmakyapan, Humeyra Caglayan, Andriy E. Serebryannikov, and Ekmel Ozbay

Appl. Phys. Lett. 98, 051103 (2011); http://dx.doi.org/10.1063/1.3552675 (3 pages) | Cited 13 times

Online Publication Date: 2 February 2011

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Strong directional selectivity is theoretically predicted and experimentally validated at the microwave frequencies in the beaming regime for a single subwavelength slit in nonsymmetric metallic gratings with double-side corrugations. The operation regime can be realized at a fixed angle of incidence when the surface-plasmon assisted transmission is significant within a narrow range of observation angles, if illuminating one of the grating interfaces, and tends to vanish for all observation angles, if illuminating the opposite interface. The studied effect is connected with asymmetry (nonreciprocity) in the beaming that occurs if the surface plasmon properties are substantially different for the two interfaces being well isolated from each other.
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42.79.Dj Gratings
42.25.Bs Wave propagation, transmission and absorption

Chaotic emission and tunable self-sustained pulsations in a two-section Fabry–Perot quantum dot laser

Charis Mesaritakis, Apostolos Argyris, Christos Simos, Hercules Simos, Alexandros Kapsalis, Igor Krestnikov, and Dimitris Syvridis

Appl. Phys. Lett. 98, 051104 (2011); http://dx.doi.org/10.1063/1.3552962 (3 pages)

Online Publication Date: 2 February 2011

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We present an experimental study on the intrinsic instabilities of a two electrode InAs/InGaAs Fabry–Perot quantum dot laser in the absence of optical feedback. By individually controlling the current injected in each electrode, different regimes of operation are allowed including tunable self-sustained pulsations and coherence collapse resulting to possible chaotic emission. The origin of these effects does not resign in the presence of optical feedback but is associated to the carrier dynamics of the quantum dot device. A numerical analysis on the time traces collected from the device reveals high complexity output in terms of correlation dimension.
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42.55.Px Semiconductor lasers; laser diodes
42.60.By Design of specific laser systems
42.65.Sf Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics
42.60.Fc Modulation, tuning, and mode locking
42.65.Re Ultrafast processes; optical pulse generation and pulse compression

Compact microdisk cavity laser with type-II GaSb/GaAs quantum dots

K. S. Hsu, T. T. Chiu, Wei-Hsun Lin, K. L. Chen, M. H. Shih, Shih-Yen Lin, and Yia-Chung Chang

Appl. Phys. Lett. 98, 051105 (2011); http://dx.doi.org/10.1063/1.3543839 (3 pages) | Cited 2 times

Online Publication Date: 3 February 2011

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Microdisk lasers with active region made of type-II GaSb/GaAs quantum dots on the GaAs substrate have been demonstrated. A microdisk cavity with diameter of 3.9 μm was fabricated from a 225-nm-thick GaAs layer filled with GaSb quantum dots. Lasing at wavelengths near 1000 nm at 150 K was achieved for this microdisk. A high threshold characteristic temperature of 77 K was also observed. It is found that the lasing wavelength matches closely with the first-order whispering-gallery mode of the cavity as obtained from the finite-element method simulation.
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42.55.Sa Microcavity and microdisk lasers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.60.By Design of specific laser systems
42.55.Px Semiconductor lasers; laser diodes
42.86.+b Optical workshop techniques

Enhanced optical output power of green light-emitting diodes by surface plasmon of gold nanoparticles

Chu-Young Cho, Sang-Jun Lee, Jung-Hoon Song, Sang-Hyun Hong, Song-Mae Lee, Yong-Hoon Cho, and Seong-Ju Park

Appl. Phys. Lett. 98, 051106 (2011); http://dx.doi.org/10.1063/1.3552968 (3 pages) | Cited 18 times

Online Publication Date: 3 February 2011

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We demonstrate the surface plasmon (SP) enhanced green light-emitting diodes (LEDs). The Au nanoparticles were embedded in the p-GaN of LEDs. The photoluminescence and electroluminescence measurements showed improved optical properties of LEDs with Au nanoparticles due to an increase in the spontaneous emission rate by resonance coupling between the excitons in multiple quantum wells and localized surface plasmons in Au nanoparticles. The optical output power of SP-enhanced green LEDs with Au nanoparticles was increased by 86% without showing degradation of the electrical characteristics of LEDs compared to LEDs without Au nanoparticles.
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85.60.Jb Light-emitting devices
78.68.+m Optical properties of surfaces
78.60.Fi Electroluminescence
FREE

Temperature dependence of a high-performance narrow-stripe (1 μm) single quantum-well transistor laser

M. Feng, N. Holonyak, Jr., and A. James

Appl. Phys. Lett. 98, 051107 (2011); http://dx.doi.org/10.1063/1.3528206 (3 pages) | Cited 1 time

Online Publication Date: 3 February 2011

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Data are presented on the thermal behavior of a high performance 1 μm wide stripe quantum-well (QW) transistor laser in continuous-wave single-mode operation up to 40 °C, multimode to 55 °C. The electrical and optical outputs of the TL are found to be complementary across temperature, directly correlated with the spontaneous and stimulated radiative recombination process. The QW transistor laser operates on two states, lower and upper, at two characteristic temperatures, T0 (ITH = I0 exp(T/T0)). On the lower state transition, T00 = 40 K, and on the upper state, T01 = 70 K, the difference in performance and speed (bandwidth) connected directly to the different recombination lifetimes on each state and the confining barrier heights of the lower |0〉 and upper state |1〉.
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42.55.Px Semiconductor lasers; laser diodes
85.35.Be Quantum well devices (quantum dots, quantum wires, etc.)
42.60.By Design of specific laser systems

Self-established noncollinear oscillation and angular tuning in a quasi-phase-matched mirrorless optical parametric oscillator

Gustav Strömqvist, Valdas Pasiskevicius, and Carlota Canalias

Appl. Phys. Lett. 98, 051108 (2011); http://dx.doi.org/10.1063/1.3551526 (3 pages)

Online Publication Date: 3 February 2011

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We experimentally demonstrate self-established noncollinear interactions in a quasi-phase-matched mirrorless optical parametric oscillator using a periodically-poled KTiOPO4 crystal with submicrometer periodicity. It is shown that the oscillation is established in a very specific geometric configuration where the two possible solutions of the energy and momentum conservation conditions become spatially degenerate and contribute coherently to the gain. In this configuration, the signal and the idler remain mutually counter-propagating. The tuning capabilities of a noncollinear mirrorless optical parametric oscillator are investigated.
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42.65.Yj Optical parametric oscillators and amplifiers
42.70.Mp Nonlinear optical crystals

Terahertz metasurfaces with high Q-factors

Christian Jansen, Ibraheem A. I. Al-Naib, Norman Born, and Martin Koch

Appl. Phys. Lett. 98, 051109 (2011); http://dx.doi.org/10.1063/1.3553193 (3 pages) | Cited 12 times

Online Publication Date: 4 February 2011

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We propose asymmetric D-split resonators as unit cells for high Q metasurfaces. In such resonators, current trapped modes lead to in-phase oscillations of antisymmetric currents. Thus, radiation losses are suppressed, enabling Q-factors beyond the ones obtainable in symmetric designs. We compare the proposed structure against both asymmetric and symmetric split ring metasurfaces and find an improvement in terms of Q by a factor of two and ten, respectively. Transmission measurements in a terahertz spectrometer provide experimental proof of the high Q-factors and agree well with numerical simulations. In the future, asymmetric D-split metasurfaces could be employed as high-performance sensors or filters.
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07.57.Pt Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques
42.79.-e Optical elements, devices, and systems
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