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Coherent transition radiation was observed from aluminum foils irradiated by an ultra-intense laser. Comparison of experiments and theoretical calculations indicated two streams of hot electron micro-pulses were generated by resonance absorption and jtimesB heating.
We demonstrate a real-time method of blood analysis. Using a novel coherent Raman technique we record the vibrational spectrum from picoliters of whole blood in milliseconds. This method will allow real-time, in vivo, blood monitoring.
We report the first experimental study of plasmas created by photoionization of solid targets with focused soft X-ray laser light. The plasma properties are dominantly determined by material absorption, in agreement with model simulations.
We demonstrate optical super-resolution by using custom obscuration apertures and polarization effects to manipulate the pupil-function and focal-plane point-spread-function in a two-photon microscope used for semiconductor flip-chip imaging. Experimental results suggest sub-100 nm performance.
We propose a novel optical switch with slowing light in Bragg reflector waveguide. Slowing light gives us large equivalent refractive index change due to its waveguide dispersion, which permits 90-degree bend of crossbar optical switches.
We report on our investigation of THz emission from femtosecond filaments in argon and propose a single-shot scheme for determination of the absolute carrier envelope phase with a 2-pi ambiguity.
Multiple-focal-plane spatial phase retrieval for a chirped-pulse-amplification laser is demonstrated for the first time. Advantages of this method are simplicity of setup, ability to measure angular dispersion, and potential integration into precision, on-shot focal-spot diagnostics.
Ultra-high Q (>5 times 105) microdisk resonators are demonstrated in a SiNx platform at 650 nm with integrated in-plane coupling waveguides on a Si substrate. Critical coupling to first-order radial-mode is demonstrated using pedestal layer to control coupling.
We present the first full theoretical and numerical analysis of the influence of the waveguide geometry and intrinsic material frequency dispersion of the nonlinearity, on the Si wires effective third-order nonlinearity and its frequency dispersion.
An InGaN/GaN thin-film light-emitting diode with the photonic crystal (PhC) on the surface and a TiO2/SiO2 omnidirectional reflector on the bottom was fabricated and found the line-width emission spectrum of 5 nm by the PhC.
We studied the spatio-temporal behavior of the carriers in photonic crystal nanocavities and showed that diffusion enables fast switching, which is the advantage of nanocavity switches over other larger optical switches.
We demonstrate 268 nm period planar Bragg gratings and Mach-Zehnder interferometers fabricated by direct UV-writing. Grating reflectivities of ~30 dB and FWHM of ~0.16 nm were measured at operational wavelengths around 800 nm.
We address the role of singlet-triplet splitting in controlling the radiative rate for deep-blue electrophosphorescent metal complexes. An enhanced radiative rate correlates with a small splitting, highlighting the road map to efficient electrophosphorescence.
We present a method using either laser or white evanescent illumination combined to spatial modulation and camera lock-in detection allowing the measurement of scattering images and spectra of individual gold nanoparticles.
We integrated into GaN LEDs both two-dimensional photonic crystal patterns and angled sidewall deflectors. The resultant devices exhibited about three-fold enhancement in vertical emission intensity when compared with the planar reference LED device.
Combined thermal and near-field imaging monitors the catastrophic optical damage dynamics in diode lasers. Red-emitting high-power lasers display a very rapid and spatially confined catastrophic process with re-absorption as the key-mechanism of device degradation.
A DWDM tunable electro-optic filter using photonic bandgaps was designed. The tuning range and minimum channel spacing was controlled by an electro-optic defect, Pb (Mg1/3Nb1/3)O3-PbTiO3, or by including the EO material within the reflecting stacks.
ITO supports surface plasmon polaritons above 2.28 mum wavelength in symmetric glass-ITO-glass waveguides. Here, we report the dispersion relationship and experimental findings.
We report on a method to generate an interference pattern from a slit-groove structure. Although we have not used a double-slit, a Young like interference pattern is observed due to the effect of surface plasmons.
We report our investigation of catastrophic optical damaged high power multi-mode InGaAs-AlGaAs strained quantum well (QW) lasers using electron beam induced current (EBIC), focused ion beam (FIB), and high-resolution transmission electron microscope (HR-TEM) techniques.
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