Opticist.org

Cheng He, Xiao-Lin Chen, Ming-Hui Lu, Xue-Feng Li, Wei-Wei Wan et al.
We report our design of a tunable one-way cross-waveguide splitter, resulting from the broken time-reversal symmetry, based on the edge modes of gyromagnetic photonic crystal. Mode control is accomplished by altering the radius or refractive index of a single central electro-optical rod. The on-off ... [Appl. Phys. Lett. 96, 111111 (2010)] published Wed Mar 17, 2010.

S. Stivala, A. C. Busacca, L. Curcio, R. L. Oliveri, S. Riva-Sanseverino et al.
We report on backward second-harmonic-generation in bulk periodically poled congruent lithium niobate with a 3.2 [mu]m period. A tunable continuous-wave Ti:sapphire laser allowed us exciting two resonant quasi-phase-matching orders in the backward configuration. The resonances were also resolved by ... [Appl. Phys. Lett. 96, 111110 (2010)] published Wed Mar 17, 2010.

K. L. Litvinenko, M. A. Leontiadou, Juerong Li, S. K. Clowes, M. T. Emeny et al.
Electron spin relaxation times have been measured in InSb and InAs epilayers in a moderate (<4 T) external magnetic field. A strong and opposite field dependence of the spin lifetime was observed for longitudinal (Faraday) and transverse (Voigt) configuration. In the Faraday configuration the spin ... [Appl. Phys. Lett. 96, 111107 (2010)] published Tue Mar 16, 2010.

Guoqiang Li and Peng Wang
We propose and demonstrate a novel technique for efficient local fixing of photorefractive polymer hologram using a laser beam. In the technique, a CO laser beam is used to heat the sample and a local hologram can be fixed easier than previous methods. By using thinner glass substrates for the photo ... [Appl. Phys. Lett. 96, 111109 (2010)] published Tue Mar 16, 2010.

Lech Sznitko, Agata Anczykowska, Jaroslaw Mysliwiec, and Stanislaw Bartkiewicz
The authors report on grating spacing influence on self-diffraction phenomenon in nematic liquid crystal panel with photoconducting polymeric layer. For grating recording typical degenerated two-wave mixing experimental set-up was used. Self-diffraction was induced by neodymium doped yttrium aluminu ... [Appl. Phys. Lett. 96, 111106 (2010)] published Tue Mar 16, 2010.

Christian Jansen, Steffen Wietzke, Victoria Astley, Daniel M. Mittleman, and Martin Koch
We describe the fabrication and characterization of fully flexible one-dimensional photonic crystals for terahertz frequencies based on alternating layers of a highly refracting polymeric compound and a pure polymer. Due to the high permittivity contrast and low intrinsic material absorption, even a ... [Appl. Phys. Lett. 96, 111108 (2010)] published Tue Mar 16, 2010.

C.-R. Lee, S.-H. Lin, H.-S. Ku, J.-H. Liu, P.-C. Yang et al.
This work demonstrates the feasibility of an optically band-tunable color cone lasing emission (CCLE) based on a dye-doped cholesteric liquid crystal with a photoisomerizable chiral dopant. Experimental results indicate that the lasing band of the formed CCLE can be tuned optically among various col ... [Appl. Phys. Lett. 96, 111105 (2010)] published Tue Mar 16, 2010.

F. Romanato, K. H. Lee, G. Ruffato, and C. C. Wong
The polarization effects of surface plasmon polaritons (SPP) in an azimuthally rotated gratings have been investigated. Mixed s and p modes can be excited using the polarization angle of the incident light to optimize the SPP coupling. Experimental results and simulations show which component of pol ... [Appl. Phys. Lett. 96, 111103 (2010)] published Mon Mar 15, 2010.

Alexander Soibel, David Z.-Y. Ting, Cory J. Hill, Mike Lee, Jean Nguyen et al.
We experimentally investigate the noise and gain of high-performance long-wavelength superlattice (SL) infrared photodetectors. We compare a recently demonstrated SL heterodiode, which exhibits an electrical gain much larger than unity, with a SL photodetector without gain to show that the electrica ... [Appl. Phys. Lett. 96, 111102 (2010)] published Mon Mar 15, 2010.

A. Krishnan, S. P. Frisbie, L. Grave de Peralta, and A. A. Bernussi
We report results on the propagation modes in plasmonic structures incorporating a gain medium using Fourier-plane leakage radiation microscopy. We demonstrate that high contrast images and detailed mode propagation information can be obtained with arrays of dielectric loaded surface plasmon wavegui ... [Appl. Phys. Lett. 96, 111104 (2010)] published Mon Mar 15, 2010.

Richard A. Flynn, Igor Vurgaftman, Konrad Bussmann, B. S. Simpkins, Chul Soo Kim et al.
A far-field microscopy approach is introduced that measures the transmittance of surface plasmon polaritons across gaps in plasmonic waveguides. Local plasmon intensity is monitored through radiation scattered from discontinuities placed before and after the gap. An unusually broad range of gap size ... [Appl. Phys. Lett. 96, 111101 (2010)] published Mon Mar 15, 2010.

H. K. Liang, S. F. Yu, and H. Y. Yang
Room-temperature ultraviolet random lasing action is demonstrated from a p-GaN/annealed i-ZnO:Al(3%)/n-ZnO:Al(5%) buried heterojunction diode with a 2 [mu]m rib waveguide. Excellent electrical-to-optical conversion efficiency is achieved by strong electrical and optical confinement of a buried hete ... [Appl. Phys. Lett. 96, 101116 (2010)] published Fri Mar 12, 2010.

Michael C. Hegg, Matthew P. Horning, Tom Baehr-Jones, Michael Hochberg, and Lih Y. Lin
We report high-performance nanoscale photodetectors utilizing annealed nanocrystal quantum dots (QDs) within a nanoscale metal electrode gap. By optimizing the nanogap size and fabrication process, the device demonstrates a significantly better sensitivity (noise equivalent power=7.76 x 10 W/Hz) an ... [Appl. Phys. Lett. 96, 101118 (2010)] published Fri Mar 12, 2010.

Wei Lin, Shuping Li, and Junyong Kang
The near-ultraviolet (UV) light emitting diodes (LED) using ultrathin InN/GaN quantum well (QW) are fabricated by metal organic vapor phase epitaxy. The x-ray diffraction measurement shows well-defined satellite peaks, which implies abrupt interfaces and good layer periodicity of the QWs. The electr ... [Appl. Phys. Lett. 96, 101115 (2010)] published Fri Mar 12, 2010.

S. Marcet, K. Ohtani, and H. Ohno
The effects of a vertical electric field on the fine structure splitting of neutral exciton of monolayer fluctuation GaAs quantum dots were investigated. Using the gate voltage between the top gate electrode and the bottom n-GaAs substrate, the fine structure splitting of the neutral exciton was tun ... [Appl. Phys. Lett. 96, 101117 (2010)] published Fri Mar 12, 2010.

H. W. Seo, L. W. Tu, Q. Y. Chen, C. Y. Ho, Y. T. Lin et al.
A III-nitride-based photogated transistor using photons to control the channel width of an otherwise gateless field effect transistor (FET) is investigated. This is accomplished by stacking sequential layers of p-GaN/InGaN/n-GaN on a Si substrate in an array of nanorods. The nitride p-i-n diode can ... [Appl. Phys. Lett. 96, 101114 (2010)] published Thu Mar 11, 2010.

J. Bravo-Abad, A. W. Rodriguez, J. D. Joannopoulos, P. T. Rakich, S. G. Johnson et al.
In this letter, we show theoretically how the light-confining properties of triply-resonant photonic resonators can be tailored to enable dramatic enhancements of the conversion efficiency of terahertz (THz) generation via nonlinear frequency down-conversion processes. Using detailed numerical calcu ... [Appl. Phys. Lett. 96, 101110 (2010)] published Wed Mar 10, 2010.

Xiaoyu Miao, Brandon Passmore, Aaron Gin, William Langston, Shivashankar Vangala et al.
We demonstrate metamaterials at the mid-infrared (mid-IR) wavelengths (812 [mu]m) that can be widely tuned by doping in adjacent semiconductor epilayers. The metamaterials are based on metallic split ring resonators (SRRs) fabricated on doped indium antimonide (InSb). Finite integral time-domain si ... [Appl. Phys. Lett. 96, 101111 (2010)] published Wed Mar 10, 2010.

G. Tabares, A. Hierro, J. M. Ulloa, A. Guzman, E. Munoz et al.
Schottky photodiodes based on Au-ZnMgO/sapphire are demonstrated covering the spectral region from 3.35 to 3.48 eV, with UV/VIS rejection ratios up to ~10 and responsivities as high as 185 A/W. Both the rejection ratio and the responsivity are shown to be largely enhanced by the presence of an inter ... [Appl. Phys. Lett. 96, 101112 (2010)] published Wed Mar 10, 2010.

K. Kalantar-zadeh, K. Khoshmanesh, A. A. Kayani, S. Nahavandi, and A. Mitchell
We present a tuneable optical waveguide using dielectrophoretically controlled nanoparticles in microfluidics. Silicon dioxide nanoparticles of different sizes in de-ionized water are channelled through a microfluidic system. An array of microelectrodes generates the dielectrophoretic force to funne ... [Appl. Phys. Lett. 96, 101108 (2010)] published Wed Mar 10, 2010.