Showing papers in "Frontiers in Optics in 2007"
TL;DR: This work reports the first observation of Airy optical beams, a class of wave packets that can exhibit unusual features such as the ability to remain diffraction-free over long distances while they tend to freely accelerate during propagation.
Abstract: We report the first observation of Airy optical beams. These wavepackets have been realized in both one- and two-dimensional configurations. It is demonstrated experimentally that these non-diffracting Airy beams tend to freely accelerate during propagation.
434 citations
TL;DR: In this article, the authors demonstrate cooling of the vibrational mode of a micro-mechanical resonator made to support a tiny mirror of a resonator by using radiation forces.
Abstract: Using radiation forces, we demonstrate cooling of the vibrational mode of a micro-mechanical resonator made to support a tiny mirror of a resonator. Optical cooling to 135 ± 15 mK from room temperature is demonstrated.
130 citations
TL;DR: In this article, the authors review different optical techniques for generating arbitrary waveforms and present their latest results using a time-domain approach using a single-input single-out (SISO) approach.
Abstract: Optical means for generating arbitrary waveforms have attracted renewed interest because of the wide bandwidth. We will review different optical techniques for generating arbitrary waveforms and will present our latest results using a time-domain approach.
88 citations
TL;DR: In this article, nonlinear optical phenomena from collective motion of ultracold atoms within a strong-coupling cavity are reported. The nonlinearity arises from probe-induced atom displacement.
Abstract: We report on nonlinear optical phenomena from collective motion of ultracold atoms within a strong-coupling cavity. The nonlinearity arises from probe-induced atom displacement. Longevity of motional coherence allows nonlinearity at extremely low cavity photon numbers.
65 citations
TL;DR: In this article, the authors present theoretical and experimental work on simultaneous spatial and temporal focusing in nonlinear microscopy, and propose a method for simultaneous focusing and focusing in a single image.
Abstract: We present in this paper our recent theoretical and experimental work on simultaneous spatial and temporal focusing in nonlinear microscopy.
30 citations
TL;DR: In this article, a wavelength selective coupler on a silicon chip using vertical grating structures was demonstrated, which possess simplicity in design and fabrication and can be used for add-drop filters and other functional devices.
Abstract: We demonstrate a wavelength selective coupler on a silicon chip using vertical grating structures, which possess simplicity in design and fabrication. The coupler can be used for add- drop filters and other functional devices.
21 citations
TL;DR: In this article, microwave-scaled experiments confirmed the properties of a subwavelength-waist photonic jet emitted by a dielectric sphere, and associated enhanced position-dependent backscattering perturbations by a λ/10 diameter metal particle.
Abstract: Our microwave-scaled experiments confirmed the properties of a sub-wavelength-waist photonic jet emitted by a dielectric sphere, and associated enhanced position-dependent backscattering perturbations by a λ/10 diameter metal particle. The results were supported by FDTD simulations.
20 citations
16 citations
TL;DR: In this paper, a surface emitting polymer dye laser is fabricated by nanoimprint lithography and the laser cavity consists of a 2nd-order circular grating distributed-feedback structure.
Abstract: A surface emitting polymer dye laser is fabricated by nanoimprint lithography. The laser cavity consists of a 2nd-order circular grating distributed-feedback structure. This nanoimprinted dye laser offers a low-cost coherent light source for lab-on-chip microsystems.
14 citations
TL;DR: A necessary and sufficient condition is derived for certain ad hoc expressions that are frequently used in the literature to represent correctly the degree of polarization of a light beam.
Abstract: We discuss conditions under which certain ad hoc expressions for the degree of polarization of a light beam, frequently used in the literature, are valid.
11 citations
TL;DR: Retinal prosthetic system based on conversion of near-infrared light into pulsed electric current using subretinal photodiode array will be presented and limits of resolution and issues of the interface with retina will be discussed.
Abstract: Retinal prosthetic system based on conversion of near-infrared light into pulsed electric current using subretinal photodiode array will be presented. System performance, limits of resolution and issues of the interface with retina will be discussed.
TL;DR: In this paper, the spectral noise power of photon number fluctuations inside a driven high-finesse Fabry-Perot optical resonator is measured through the resonator-enhanced momentum diffusion of ultracold atoms trapped within.
Abstract: The spectral noise power of photon number fluctuations inside a driven high-finesse Fabry-Perot optical resonator is measured through the resonator-enhanced momentum diffusion of ultracold atoms trapped within. Light-induced heating of the trapped atoms is quantified by their rate of Evaporation from a finite-depth intra cavity optical trap. The relevance of cavity-enhanced momentum diffusion to cavity-enhanced measurements of atomic ensembles is discussed.
TL;DR: Optical signal amplification by using homodyne detection scheme was newly proposed and demonstrated experimentally as mentioned in this paper, which improved S/N for an 8-layer and 3x-read-speed Blu-ray Disc by more than 20 dB.
Abstract: Optical signal amplification by using homodyne detection scheme was newly proposed and demonstrated experimentally. We estimated that the scheme improved S/N for an 8-layer and 3x-read-speed Blu-ray Disc by more than 20 dB.
TL;DR: In this article, the first measurements of effective masses and other parameters for SiGe/Ge quantum well optoelectronics on silicon have been obtained using photocurrent measurements in Ge quantum wells and quantum tunneling resonance simulations.
Abstract: Photocurrent measurements in Ge quantum wells and quantum tunneling resonance simulations give the first measurements of effective masses and other parameters for design of high-performance SiGe/Ge quantum well optoelectronics on silicon.
TL;DR: In this article, a method that allows selective creation and detection of a macroscopic long-lived hexadecapole polarization in the F = 2 ground state of 87Rb atoms at Earth's magnetic field (510 mG) was proposed.
Abstract: We report a novel method that allows selective creation and detection of a macroscopic long lived hexadecapole polarization in the F = 2 ground state of 87Rb atoms at Earth's magnetic field (510 mG).
TL;DR: A computational sensor design for high-resolution wide-angle imaging is presented by multiplexing multiple sub-fields-of-view onto a single image sensor using feature-specific imaging techniques.
Abstract: We present a computational sensor design for high-resolution wide-angle imaging by multiplexing multiple sub-fields-of-view onto a single image sensor using feature-specific imaging techniques.
TL;DR: An imaging polarimeter capable of measuring a complete Mueller matrix of the retina has been designed, built, calibrated, validated, and used on human subjects.
Abstract: An imaging polarimeter capable of measuring a complete Mueller matrix of the retina has been designed, built, calibrated, validated, and used on human subjects. Retardance, diattenuation, and depolarization images of normal retinas are presented.
TL;DR: In this article, the physical properties of the films were studied as the basic materials for the plasmonic devices, and the sol-gel and dip coating methods were used.
Abstract: ZrO2thin films containing silver and gold nanoparticles were prepared using the sol-gel and dip coating methods. The physical properties of the films were studied as the basic materials for the plasmonic devices.
TL;DR: Malaria infected and control tissues were measured using a confocal laser scanning Macroscope in reflection mode, with differing polarizations to increase the contrast of the malaria parasites within the tissue.
Abstract: Malaria infected and control tissues were measured using a confocal laser scanning Macroscope in reflection mode, with differing polarizations. The contrast of the malaria parasites within the tissue was increased.
TL;DR: In shadow and glare regions traditional imaging methods may yield inaccurate polarization information due to dynamic range limit, noise, and black-level fluctuation as mentioned in this paper, and this new method solves these issues and yields accurate polarization information.
Abstract: In shadow and glare regions traditional imaging methods may yield inaccurate polarization information due to dynamic range limit, noise, and black-level fluctuation. This new method solves these issues and yields accurate polarization information.
TL;DR: In this article, a new type of Fourier transform interferometer based on a tunable slow-light medium is proposed, which can have very fine spectral resolution and is more compact than a conventional FT-interferometer.
Abstract: We propose a new type of Fourier-transform interferometer based on a tunable slow- light medium. Such a FT-interferometer requires no moving arm, can have very fine spectral resolution, and is more compact than a conventional FT-interferometer.
TL;DR: In this paper, a multi-objective genetic algorithm was applied to the optimization of multiphoton excited fluorescence, and the results indicated the consistent advantages of this method to experiments based on adaptive shaping of femtosecond pulses.
Abstract: We have applied a multi-objective genetic algorithm to the optimization of multiphoton excited fluorescence. Our study indicates the consistent advantages this method can offer to experiments based on adaptive shaping of femtosecond pulses.
TL;DR: In this paper, the first electroabsorption modulator using the quantum-confined Stark effect in Ge was demonstrated and the contrast ratio was 7.3 dB at 1457 nm and exceeds 3 dB over 20 nm bandwidth.
Abstract: We demonstrate the first electroabsorption modulator using the quantum-confined Stark effect in Ge. For 10 V swing, the contrast ratio is 7.3 dB at 1457 nm, and exceeds 3 dB over 20 nm bandwidth.
TL;DR: In this paper, an analysis of coherence properties of pulsed fields in interferometric experiments is presented, and the results bear on means to recover certain statistical properties of the source in a two-slit experiment.
Abstract: An analysis of coherence properties of pulsed fields in interferometric experiments is presented. The results bear on means to recover certain statistical properties of the source in a two-slit experiment.
TL;DR: In this article, the MAD demonstrator performed on-sky observations at VLT telescope for validating Ground-Layer, Laser Tomography and Multi-Conjugate Adaptive Optics correction.
Abstract: The MAD demonstrator performed on-sky observations at VLT telescope for validating Ground-Layer, Laser Tomography and Multi-Conjugate Adaptive Optics correction. Here we present the results obtained on the sky and in laboratory for Star Oriented mode. Article not available.
TL;DR: In this article, the change in group index in a semiconductor optical amplifier due to carrier heating and spectral hole burning dominates in short pulse shaping, resulting in fast/slow light.
Abstract: The change in group index in a semiconductor optical amplifier due to carrier heating and spectral hole burning dominates in short pulse shaping, resulting in fast/slow light.
TL;DR: In this article, a bioluminescence detection system using semiconductor detectors for rapid parallel diagnostic assays was presented, which achieved a detection rate of 109 photons/sec using Silicon detectors.
Abstract: We present design of bioluminescence detection systems using semiconductor detectors for rapid parallel diagnostic assays. Bioluminescence emission detection of 109photons/sec was demonstrated using Silicon detectors. Improved GaAs-based bio-sensors were designed for improved detection sensitivity.
TL;DR: In this article, the spin Hall effect of light has been measured using quantum weak-measurements as a coherent amplification mechanism for small signals, and the first time the spin-hall effect has been observed in real time.
Abstract: Using the techniques of “quantum weak-measurements” as a coherent amplification mechanism for small signals, for the first time we have measured the recently proposed “spin Hall effect” of light.
TL;DR: In this article, spectroscopic optical coherence tomography in the mid-infrared region is described as a method for separating and analyzing biological molecules, which is capable of obtaining broadband spectra using low spatial coherence light.
Abstract: We describe spectroscopic optical coherence tomography in the mid-infrared region as a method for separating and analyzing biological molecules. Such auto-correlation interferometry is capable of obtaining broadband spectra using low spatial coherence light.
TL;DR: In this article, the authors report evidences of their potential impact as sensing devices for multipurpose applications for fiber-top cantilevers, which are obtained by carving a cantilever out of the edge of a single-mode optical fiber.
Abstract: Fiber-top cantilevers are new monolithic devices obtained by carving a cantilever out of the edge of a single-mode optical fiber. Here we report evidences of their potential impact as sensing devices for multipurpose applications.