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Interferometric lithography provides a facile technique for the fabrication of large-areas of nanophotonic structures. Examples of both linear and nonlinear responses will be drawn from plasmonics, metamaterials, and photonic crystals.
Lighting applications are presently limited by the lack of efficient LEDs across the visible spectrum. We review materials challenges that underlie the ldquogreen-yellow gaprdquo in LED efficiency and describe emerging approaches for bridging that gap.
We introduce a new class of coherent metamaterials where regular ensembles of meta-molecules show collective, coherent narrow-band response leading to unusual electromagnetic properties and potential applications in the lasing spaser.
Organic nonlinear crystals are most promising materials for efficient THz wave generation using DFG as well as TDS. Two kinds of organic crystals : 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) and N-benzyl-2-methyl-4-nitroaniline (BNA) are investigated for ultrawide THz-wave generation. New THz applications will be presented using frequency-agile THz sources.
Using the unique characteristics of multiphoton ionization with focused femtosecond pulses, we report on a pump and probe metrology to analyze carrier dynamics inside dielectrics. We characterize the sub-picosecond trapping of carriers inside fused SiO2.
We demonstrate second harmonic generation from a single GaAs nanoneedle with a wurtzite crystal structure. The optical anisotropy of the polar crystal results in strong nonlinear optical conversion compared to normal zincblende GaAs.
The heat dissipation time in an InP-based photonic crystal nano-cavity was measured. Our method is based on time-resolved reflectivity of a cw beam coupled through a tapered fiber. Dissipation times around 2 mus were obtained.
Using a two stage, white-light seeded, collinear, femtosecond optical parametric amplifier based on BIBO crystal, sub-30-fs signal pulses with energies exceeding 200-muJ, corresponding to 5-fold pulse shortening and ~30% internal conversion efficiency, are generated.
We apply pulse-front matching to a near-IR non-collinear optical parametric amplifier based on a bulk KTiOPO4 crystal. Pulses as broad as ~32 THz at ~1200 nm with almost no angular dispersion could be produced.
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.
Structuring the core of a photonic crystal fiber is used to fulfill the phase-matching condition required for broadband intermodal four-wave mixing. Experimental data show efficient red generation on LP01 mode from 1064 nm pumping.
We present terahertz emission from nonpolar InN due to carrier transport in stacking fault-related internal in-plane electric fields. Evidence of in-plane transport is observed as a terahertz waveform polarity flip with reversal of the c-axis.
Guided acoustic wave Brillouin scattering (GAWBS) in PCFs is altered by the air-silica structure of the inner cladding and does not depend on the cladding diameter as with standard fibers. This dependence is investigated.
We demonstrate a novel ultra-fast high-contrast switching mechanism of two-level atoms driven by milliwatt picosecond pulse trains in PBG circuits with step-shaped density of states profiles. Possible application as low-threshold, multi-wavelength-channel all-optical transistors is discussed.
We experimentally study the polarization dynamics (orientation and ellipticity) of near infrared light transmitted through magnetooptic yttrium iron garnet isolator crystal pairs using a modified balanced detection scheme. When the pair separation is in the sub-millimeter range, we observed a proximity effect in which the saturation field is reduced by up to 20%. Calculations using a 1D model suggest...
Using a proton beam based lithography process, we fabricate and study high aspect ratio metamaterials, revealing distinct 3-dimensional resonances. Increased aspect ratio also leads to enhanced tunability and sensitivity for practical applications.
We measure the angular dependent response of a Swiss-cross metamaterial that has an effective index of n=-1.9 at normal incidence. It is experimentally shown how the effective properties depend on the incidence angle.
We demonstrate a wideband invisibility cloak in the optical regime composed of nanometer scale non-resonant dielectric structures. The cloak conceals a deformation on a reflecting surface, under which an object can be hidden.
We report break-up of cylindrical shell into well-ordered filament arrays by optical-fiber thermal drawing. Enhanced photosensitivity of centimeter-long crystalline-Se nano-filaments is observed and the mechanism is discussed. This work paves a way to in-fiber nanodevices.
We report on all-epitaxial growth of large diameter (3-inch), large aperture (>1.5 mm thick), low-loss (<0.005 cm-1) QPM GaAs. 2-mum-laser-pumped OPO performance was comparable to that of ZnGeP2.
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