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The momentum transfer to a scatterer from Raman photons was detected using an optical system that permits one to simultaneously measure the radiation forces exerted on, and the Raman emission from the scatterer.
An improved implementation of optical space domain reflectometry is presented using an interferometric characterization method and deconvolution technique. Reconstruction of a strong Bragg grating written in erbium fiber, with a qL ~ 8.6 is demonstrated.
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.
Three-dimensional icosahedral dielectric photonic quasicrystals previously revealed highly structured transmittance spectra and unusual photon transport properties. Using a periodic approximant approach, we show that all these findings are consistent with multiple scattering of light.
We study the enhanced absorption of optical radiation by molecules placed in the vicinity of spherical metal nano-particles in the realistic situation that includes perturbation of the optical field by the absorbing molecules and show that the enhancement is strong only for relatively weak and diluted absorbers.
We report the first molecular image of melanin using a novel extension of OCT, pump-probe OCT. Melanin, an abundant endogenous chromophore, could provide general contrast in OCT imaging and means to diagnose and/or monitor melanomas.
We embedded thin (down to 2 mum diameter) tapered fibres in silica aerogel with low loss. The aerogel is rigid but behaves refractively like air, protecting the tapered fibre without disturbing light propagation along it.
Four-wave mixing in semiconductor quantum wells has long been used to investigate many-particle effects. We introduce the theoretical concepts and illustrate some developments of the field, which D.S. Chemla helped to shape.
Trapped between high numerical aperture laser objectives, a single calcium ion is converted into a high-efficiency source of single photons, with controlled coherence properties. Thereby, various schemes to establish entanglement between remote ions are probed.
We present a method for describing optical properties of inhomogeneous media at mesoscopic scales. When the volume of interaction varies, the effective polarizability tensor introduces a new length scale characterizing the structural morphology.
Optical tweezers are typically used on transparent dielectric particles. Particles with optical resonances should experience a larger trapping force near resonance. We present a numerical and experimental study of trapping force on such particles.
Design of a simple doubly clamped cantilever structure capable of localizing mechanical and optical energy at the nanoscale is presented. The optical design is based upon photonic crystal concepts in which simple nanoscale patterning of a sub-micron cross-section cantilever can result in strong optical localization to an effective optical mode volume of 4 cubic wavelengths in the material (4(lambda/n)...
We demonstrate first observations of slow-light enhanced three-photon absorption(ThPA) in photonic crystal waveguides.The injected pulses demonstrate self-phase modulation(SPM) with scalings deviating from ng2(SPM) and ng3(ThPA).A thorough analysis suggests pulse compression leading to increased peak powers.
Regrowth-free gain-coupled GaSb-based DFB lasers suitable for gas sensing were fabricated. Threshold currents for 2.4 mum emission of 400 mum-long DFB devices were 45 mA with a total output power of nearly 11 mW in CW operation at 20degC.
We report plasmonic Fabry-Perot nano-cavities formed by high aspect ratio metal mirrors on a metal surface. Quality factors from 100-200 were obtained, limited by plasmonic losses and fin scattering at short and long wavelengths respectively.
We demonstrate sensitive optical readout of the motion of a wavelength-scale mechanical resonator via its scattering within a high-finesse optical cavity. Static calibration, dynamic monitoring and feedback cooling are presented.
We present two new depth resolved holographic imaging concepts with spectrally tunable diode lasers. Variable depth resolution is achieved by changing the tuning width and a concept for single-shot recording of a 3D-image is introduced.
We present a method for accessing nanoscale dimensions in semiconductor wafer metrology, using ultrafast optoacoustic ranging. One illustrative example is the measurement of dimensions and profile of nanometer scale deep trenches in silicon-wafer based structures.
We experimentally observe an opto-mechanical whispering-gallery [WG] resonator vibrating at 11 GHz. We use optical electrostriction to drive mechanical vibration at frequencies which scale inversely with optical wavelength, irrespective of micro-resonator size.
A new method for nano-engineering the optical antenna properties of scanning probe tips by combining focused ion beam milling with nano-CVD is presented. We demonstrate the capabilities by probing specific vector-field components of plasmonic nanostructures.
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