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Thermal phase noise in optical interferometry can be compensated by exploiting coherence for underlying stochastic displacements and strains. The phase upon reflection from a fluctuating mirror's surface can thereby have reduced sensitivity to thermal noise.
We investigate Hartman saturation effect in multilayer dielectric stacks. We show that the experimentally observed jumps of photon transversal times due to adding single quarter-wave layers to structures is caused by appearance of surface modes.
We use coherent extreme ultraviolet radiation to probe surface acoustic wave propagation in nickel-on-sapphire nanostructures. We observe no acoustic dispersion over SAW wavelengths down to 200 nm, meaning the SAW propagation is unaffected by the nanostructure.
We design and numerically simulate a photonic crystal waveguide cavity with a nanoslot structure for single nanoparticle trapping. A 135times enhancement of optical gradient trapping force compared to plain waveguide trapping devices has been achieved.
We demonstrate a surface-normal modulator based on free-carrier effect in GaAs and phase-to-amplitude conversion coupling to a single mode fiber. Operation over 1200-2400 nm, modulation depth up to 43% and frequency up to 270 MHz is observed.
We review the basic principles of the femtosecond laser direct writing approach. This technology opens the possibility to specifically tune the light evolution in the linear as well as in the nonlinear regime.
Modulation of the surface plasmon wave vector in composite gold/cobalt/gold multilayer films due to periodic magnetization switching in cobalt is observed with a tilted slit-groove microinterferometer.
Surface waves on metal films with subwavelength features and tunable optical resonances are excited with a quantum cascade laser. The resulting transmission through, and propagation on, the metal/dielectric interface is measured, both spectrally and spatially.
In this paper, cascading plasmonic gratings were investigated. The angle dependent reflection spectrum of the proposed structure displays a resonance peak at a specific angle. The FWHM of the resonant peak is smaller than 2deg. The angular dispersion of the cascading plasmonic gratings is about dthetas/dlambda=0.15deg/nm. The cascading plasmonic gratings can be used as a spatial filter which can improve...
We implement in plane launching and focusing surface plasmons by fabricating Fresnel zone-plate like grating on a thin gold film. A subwavelength focal spot, with transverse FWHM=712 nm, is observed at 830 nm vacuum wavelength.
We demonstrate both theoretically and experimentally that the surface plasmon polaritons supported by a metal-dielectric nanocomposite film have properties that fall into one of three distinct categories depending on the metal fill fraction.
Optical microcavites fabricated by etching whispering gallery mode and photonic crystal structures in a high-index gallium phosphide layer and an underlying single-crystal diamond substrate are studied experimentally and theoretically.
A one-dimensional photonic crystal structure in a total-internal-reflection geometry has been developed for real-time, label-free specific protein binding detection. With the streptavidin-biotin system, an ultra low mass density detection limit 24 fg/mm2 was achieved.
A simple chemical method for reducing free-carrier lifetime in silicon photonics while maintaining low optical loss is presented. Lifetimes of ~ 300 ps for optical losses of ~ 0.4 cm-1 are achieved. Ramifications for nonlinear optics are discussed.
We show that evanescent fields of microresonators can be employed for cavity-enhanced high-sensitivity monitoring of nanomechanical motion. This novel scheme opens the path to observing backaction effects using optical gradient forces in the resolved-sideband regime.
Observation of optical spin-Hall effect that appears when a wave carrying spin angular momentum interacts with plasmonic nanostructures is presented. The measurements verify the geometric phase, demonstrated by the spin-dependent deflection of the surface waves.
We have demonstrated ultrafast switching with photonic crystals integrated into Mach-Zehnder interferometers. The nonlinearity is induced by excitation of carriers into one arm of the interferometer, and switching times as short as 3ps are achieved.
We demonstrated a self-adaptive common-path Fourier-domain OCT system with real-time surface recognition and feedback control. The scanning probe tracks the sample surface variance and effective imaging depth was largely extended to the probe's free-moving range.
Discrete optics opens up new opportunities in manipulating light flow. We provide an overview of recent experimental and theoretical developments in this area. The effects of discreteness on linear and nonlinear optical interactions are discussed.
We experimentally observe light emission from a region that is far away from our on-chip device. We photograph up to 10-mum tunneling distance; this gap is greater than 20% of the device size.
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