Opticist.org

A. Dousse, J. Suffczynski, O. Krebs, A. Beveratos, A. Lemaitre et al.
The exciton and biexciton lines of a single quantum dot are deterministically coupled to the optical modes of a photonic molecule. The resonance between the quantum dot emission lines and the molecule cavity modes is reached at 53 K. The device operates as a very bright source of entangled photon pa ... [Appl. Phys. Lett. 97, 081104 (2010)] published Mon Aug 23, 2010.

D. Luo, X. W. Sun, H. T. Dai, H. V. Demir, H. Z. Yang et al.
Mode-dependent electrically tunable lasing of transverse electric (TE) and transverse magnetic (TM) modes is demonstrated in a dye-doped two-dimensional hexagonal photonic crystal made of holographic polymer-dispersed liquid crystals (LCs). Over 10 nm redshifting in lasing with multiple peaks in non ... [Appl. Phys. Lett. 97, 081101 (2010)] published Mon Aug 23, 2010.

Phosphorus, a mineral element found in rocks and bone, is a critical ingredient in fertilizers, pesticides, detergents and other industrial and household chemicals. Now chemists have developed a new way to attach phosphorus to organic compounds by first splitting the phosphorus with ultraviolet light. Their method eliminates the need for chlorine, which is usually required for such reactions and poses health risks to workers handling the chemicals.

M. K. Bhuyan, F. Courvoisier, P. A. Lacourt, M. Jacquot, R. Salut et al.
We report high aspect ratio nanochannel fabrication in glass using single-shot femtosecond Bessel beams of sub-3 [mu]J pulse energies at 800 nm. We obtain near-parallel nanochannels with diameters in the range 200800 nm, and aspect ratios that can exceed 100. An array of 230 nm diameter channels wi ... [Appl. Phys. Lett. 97, 081102 (2010)] published Mon Aug 23, 2010.

Wei-Chih Lai, Ya-Yu Yang, Li-Chi Peng, Shih-Wei Yang, Yu-Ru Lin et al.
We demonstrated GaN-based light emitting diodes (LEDs) with different embedded heights of SiO pillars and air gap array structures. The air gap on top of the SiO pillars were also realized using the enhanced epitaxial lateral overgrowth mode. With the embedded SiO pillars and air gap array structure ... [Appl. Phys. Lett. 97, 081103 (2010)] published Mon Aug 23, 2010.

Scientists have created a novel set of self-assembling molecules that can turn sunlight into electricity; the molecules can be repeatedly broken down and then reassembled quickly, just by adding or removing an additional solution.

A team of chemists has discovered that a technique known as photoacoustic infrared spectroscopy could be used to identify the composition of pigments used in art work that is decades or even centuries old. Pigments give artist's materials color, and they emit sounds when light is shone on them.

A tiny optical device built into a silicon chip has achieved the slowest light propagation on a chip to date, reducing the speed of light by a factor of 1,200.

Geoffroy Scherrer, Maxence Hofman, Wojciech Smigaj, Boris Gralak, Xavier Melique et al.
In this paper, we present photonic crystal flat lenses with interfaces engineered to improve the light transmittance thanks to a broad angles impedance matching. The interface engineering consists in the realization of antireflection gratings on the edges of the lenses which are designed to reduce t ... [Appl. Phys. Lett. 97, 071119 (2010)] published Fri Aug 20, 2010.

Shankar Kumar Selvaraja, Wim Bogaerts, Dries VanThourhout, and Marc Schaekers
Deposited silicon and, in particular, hydrogenated amorphous silicon forms an attractive alternative platform for realizing compact photonic integrated circuits. In this paper we report on trimming (toward lower wavelengths) and tuning (toward higher wavelengths) of photonic devices through a suitab ... [Appl. Phys. Lett. 97, 071120 (2010)] published Fri Aug 20, 2010.

Protecting helicopters in combat from heat-seeking missiles is the goal of new laser technology.

Qiong-Hua Wang, Xiao-Fang Li, Lei Zhou, Ai-Hong Wang, Da-Hai Li
A method is proposed to alleviate the cross talk in multiview autostereoscopic three-dimensional displays based on a lenticular sheet. We analyze the positional relationship between subpixels on the image panel and the lenticular sheet. According to this relationship, optimal synthetic images are ... [Appl. Opt. 50, B1-B5 (2011)]

Andre Fleck, Vasudevan Lakshminarayanan
The noise characteristics of a compact high-resolution Shack–Hartmann wavefront sensor with an extended pupil to sensor distance have been measured. The standard deviation, σ, of the angular position error caused by random noise conforms to theoretical predictions of discrete detector ... [Appl. Opt. 49, G136-G139 (2010)]

Fei Ye, Tong Chen, Di Xu, Kevin P. Chen, Bing Qi, Li Qian
We present a liquid level sensing system for cryogenic fluids based on an array of aluminum-coated fiber Bragg gratings written in high-attenuation fibers (HAFs) interrogated by frequency-shifted interferometry (FSI). The sensors are heated up optically through the absorption of light at the core ... [Appl. Opt. 49, 4898-4905 (2010)]

Gottipaty N. Rao, Andreas Karpf
A trace gas sensor for the detection of nitrogen dioxide based on cavity ringdown spectroscopy (CRDS) and a continuous wave external cavity tunable quantum cascade laser operating at room temperature has been designed, and its features and performance characteristics are reported. By measuring the ... [Appl. Opt. 49, 4906-4914 (2010)]

Victor A. C. Lincoln, Liliane Ventura, Sidney J. Faria e Sousa
As technology improves human vision, some procedures currently performed may be causing a decrease of the natural UV protection of the cornea. A portable dual beam system prototype was assembled for physicians for clinical studies of these effects on the corneas endowing two types of 300–400 ... [Appl. Opt. 49, 4890-4897 (2010)]

Researchers have developed a new class of electronic logic device in which current is switched by an electric field generated by the application of mechanical strain to zinc oxide nanowires.

Stefan Breuer, Mattia Rossetti, Wolfgang Elsasser, Lukas Drzewietzki, Paolo Bardella et al.
Reverse-emission-state-transition mode locking in a two-section InAs/InGaAs quantum dot laser is experimentally investigated and confirmed by simulations. Stable mode locking starts on the first excited state (lambda=1207 nm) and then, with increasing gain current, a transition to stable simultaneo ... [Appl. Phys. Lett. 97, 071118 (2010)] published Thu Aug 19, 2010.

Jose Marques-Hueso, Lorenzo Sanchis, Benoit Cluzel, Frederique de Fornel, and Juan P. Martinez-Pastor
We experimentally demonstrate a photonic integrated lens made of holes in a silicon slab operating at lambda=1550 nm. The lens has been designed using a genetic algorithm in conjunction with the two-dimensional multiple scattering theory and fabricated using silicon-on-insulator technology. scannin ... [Appl. Phys. Lett. 97, 071115 (2010)] published Thu Aug 19, 2010.

Priyanth Mehta, Mahesh Krishnamurthi, Noel Healy, Neil F. Baril, Justin R. Sparks et al.
Germanium optical fibers have been fabricated using a high pressure chemical deposition technique to deposit the semiconductor material inside a silica capillary. The amorphous germanium core material has a small percentage of hydrogen that saturates the dangling bonds to reduce absorption loss. Opt ... [Appl. Phys. Lett. 97, 071117 (2010)] published Thu Aug 19, 2010.