Opticist.org

Aglae Kellerer, Mark Chun, Christ Ftaclas
There are different techniques for sensing wavefront phase distortions due to atmospheric turbulence. Curvature sensors are practical because their sensitivity is adjustable to the prevailing atmospheric conditions. Even at the best sites, the turbulence intensity has been found to vary at times ... [Appl. Opt. 49, G140-G147 (2010)]

Daniele Bajoni, Elizaveta Semenova, Aristide Lemaitre, Sylvain Barbay, Robert Kuszelewicz et al.
Polariton diodes have been recently shown to exhibit pronounced bistability induced by the control of the light-matter coupling via an external bias and optical pumping [D. Bajoni, E. Semenova, A. Lemaitre, S. Bouchoule, E. Wertz, P. Senellart, S. Barbay, R. Kuszelewicz, and J. Bloch, Phys. Rev. Let ... [Appl. Phys. Lett. 97, 091107 (2010)] published Thu Sep 2, 2010.

Y. F. Lao, P. K. D. D. P. Pitigala, A. G. U. Perera, H. C. Liu, M. Buchanan et al.
Hole transitions from the heavy-hole (hh) to the light-hole (lh) band contributing to the 410 [mu]m response range are reported on p-GaAs/AlGaAs detectors. The detectors show a spectral response up to 16.5 [mu]m, operating up to a temperature of 330 K where the lh-hh response is superimposed on th ... [Appl. Phys. Lett. 97, 091104 (2010)] published Thu Sep 2, 2010.

David A. Powell and Yuri S. Kivshar
We demonstrate that the presence of a supporting substrate can break the symmetry of a metamaterial structure, changing the symmetry of its effective parameters, and giving rise to bianisotropy. This indicates that magnetoelectric coupling will occur in all metamaterials fabricated on a substrate, i ... [Appl. Phys. Lett. 97, 091106 (2010)] published Thu Sep 2, 2010.

Kamil Gradkowski, Tomasz J. Ochalski, Nicola Pavarelli, David P. Williams, Guillaume Huyet et al.
We investigate the emission dynamics of InAs/GaAs quantum dots (QDs) coupled to an InGaAs quantum well in a tunnel injection scheme by means of time-resolved photoluminescence. Under high-power excitation we observe a redshift in the QD emission of the order of 20 meV. The optical transition intensi ... [Appl. Phys. Lett. 97, 091105 (2010)] published Thu Sep 2, 2010.

C. H. Wu, F. Tan, M. Feng, and N. Holonyak, Jr.
Oxide-confined quantum-well microcavity vertical-cavity surface-emitting lasers (VCSELs) of three-diameters (aperture size d~2, 2.5, and 3.5 [mu]m) have been fabricated that operate as nearly single-mode lasers at ultralow thresholds I=0.15, 0.16, and 0.20 mA. Relative spectral intensities are meas ... [Appl. Phys. Lett. 97, 091103 (2010)] published Wed Sep 1, 2010.

Yan Jun Liu, Qingzhen Hao, Joseph S. T. Smalley, Justin Liou, Iam Choon Khoo et al.
A frequency-addressed plasmonic switch was demonstrated by embedding a uniform gold nanodisk array into dual-frequency liquid crystals (DFLCs). The optical properties of the hybrid system were characterized by extinction spectra of localized surface plasmon resonances (LSPRs). The LSPR peak was tune ... [Appl. Phys. Lett. 97, 091101 (2010)] published Mon Aug 30, 2010.

Fang-Fang Ren, Kah-Wee Ang, Junfeng Song, Qing Fang, Mingbin Yu et al.
The authors report on high transverse magnetic (TM)-mode responsivity in a waveguided germanium Schottky-barrier metal-semiconductor-metal photodetector on silicon-on-insulator substrate for operating wavelength at 1550 nm. The employed aluminum interdigitated electrodes act as a one-dimensional rec ... [Appl. Phys. Lett. 97, 091102 (2010)] published Mon Aug 30, 2010.

Yu Yao, Xiaojun Wang, Jen-Yu Fan, and Claire F. Gmachl
A quantum cascade laser structure is demonstrated that provides a broadband gain spectrum of 430 cm with a peak emission wavelength around 4.8 [mu]m. The laser active region is based on multiple transitions from strongly coupled upper states to lower laser states. In spite of the broad gain spectr ... [Appl. Phys. Lett. 97, 081115 (2010)] published Fri Aug 27, 2010.

S. Engelbrecht, M. Wunderlich, A. M. Shuvaev, and A. Pimenov
We have studied the optical activity of bilayered split-ring resonator arrays for millimeter waves. Using quasi-optical technique within controlled polarization rotation we were able to measure transmission and phase shift of these arrays within geometries with parallel and crossed polarizers. We de ... [Appl. Phys. Lett. 97, 081116 (2010)] published Fri Aug 27, 2010.

Alfonso Hinojosa and Suresh C. Sharma
We present evidence for relatively large changes in the electro-optical properties of a polymer-dispersed liquid crystal (PDLC) due to inclusion of small concentrations of 14 nm diameter Au-nanoparticles (NPs). We observe that NPs lower switch-on electric field, increase optical transmission at cert ... [Appl. Phys. Lett. 97, 081114 (2010)] published Thu Aug 26, 2010.

Shinji Koh, Akira Nakanishi, and Hitoshi Kawaguchi
We measured the electron spin relaxation times tau in GaAs/AlGaAs multiple quantum wells (MQWs) grown on slightly misoriented GaAs(110) substrates. The tau of the MQW on misoriented GaAs(110) decreased when the misorientation angles were increased. The bulk inversion asymmetry component of the D'yak ... [Appl. Phys. Lett. 97, 081111 (2010)] published Thu Aug 26, 2010.

Waruna D. Kulatilaka, Paul S. Hsu, Hans U. Stauffer, James R. Gord, and Sukesh Roy
We report direct measurement of H Q-branch Raman coherence lifetimes using time-resolved picosecond coherent anti-Stokes Raman scattering (ps-CARS). A custom-built, high-peak-power, nearly transform-limited ps laser system offers an ideal combination of frequency and temporal resolution for such mea ... [Appl. Phys. Lett. 97, 081112 (2010)] published Thu Aug 26, 2010.

Sylwester Latkowski, Ramon Maldonado-Basilio, Kevin Carney, Josue Parra-Cetina, Severine Philippe et al.
An all-optical heterodyne approach based on a room-temperature controlled semiconductor optical amplifier (SOA) for measuring the frequency and linewidth of the terahertz beat-tone signal from a passively mode-locked laser is proposed. Under the injection of two external cavity lasers, the SOA acts ... [Appl. Phys. Lett. 97, 081113 (2010)] published Thu Aug 26, 2010.

Ilya Goykhman, Boris Desiatov, and Uriel Levy
We experimentally demonstrate a high-Q ultrathin silicon nitride microring resonator operating at wavelength of 970 nm that is favorable for large variety of biophotonic applications. Implementation of thin device layer of 200 nm allows enhanced interaction between the optical mode and environment, ... [Appl. Phys. Lett. 97, 081108 (2010)] published Wed Aug 25, 2010.

S. Yerci, R. Li, and L. Dal Negro
Electrical devices based on Erbium (Er) doping of silicon nitride have been fabricated by reactive cosputtering and intense, room temperature Er electroluminescence was observed in the visible (527, 550, and 660 nm) and near-infrared (980 and 1535 nm) spectral ranges at low injection voltages (<5 V ... [Appl. Phys. Lett. 97, 081109 (2010)] published Wed Aug 25, 2010.

Giacomo Scalari, Dana TurCinkova, James Lloyd-Hughes, Maria I. Amanti, Milan Fischer et al.
In this paper we show that by applying a perpendicular magnetic field to a quantum cascade structure it is possible to enhance the gain of different optical transitions. The combination of magnetic confinement with a broadband, cutoff-free optical resonator allows the demonstration of laser action o ... [Appl. Phys. Lett. 97, 081110 (2010)] published Wed Aug 25, 2010.

Andreas Wacker
A simple two-well design for terahertz quantum cascade lasers is proposed which is based on scattering injection and the efficient extraction of electrons from the lower laser level by resonant tunneling. In contrast to existing designs this extraction also controls the positive differential conduct ... [Appl. Phys. Lett. 97, 081105 (2010)] published Tue Aug 24, 2010.

Jose R. Salgueiro and Yuri S. Kivshar
A study on the nonlinear modes of plasmonic directional couplers created by two nonlinear dielectric slot waveguides with metallic claddings is presented. The calculated power diagram shows substantial differences from the case of nonlinear dielectric couplers. The power-dependent switching and the ... [Appl. Phys. Lett. 97, 081106 (2010)] published Tue Aug 24, 2010.

B. Liu, C. W. Cheng, R. Chen, S. A. Ekahana, W. F. Yang et al.
The authors present the surface plasmon effects of Au nanoparticles on the photoluminescence properties of ZnCdO/ZnO coaxial multiquantum-well nanowires fabricated using chemical vapor deposition and pulse laser deposition methods. The spontaneous emission rate from ZnCdO quantum wells was increased ... [Appl. Phys. Lett. 97, 081107 (2010)] published Tue Aug 24, 2010.