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Two resonant bands in enhanced optical transmission were predicted in a star shape bull's eye plasmonic structure. Fundamental and its second harmonic resonance were analyzed parametrically to find optimal conditions for linear and nonlinear responses.
Erbium doped chalcogenide films were fabricated by cothermal evaporation and demonstrated propagation losses and lifetimes suitable for waveguide amplifiers. The 1490nm pumped Photoluminescence yield is up to ∼10x higher than the prior best film material, Er:TeO2.
Methods for growing periodically alternating polarities of GaN on N-polar and Ga-polar GaN substrates have been developed. The resulting periodically oriented samples can be extended to thick growth, allowing their use in non-linear optics.
We demonstrate the use of Gas Cluster Ion Beam (GCIB) nanoprocessing technology for producing ultrathin silver waveguide and disk structures with smoother surfaces and wider grain sizes for enhanced surface plasmon propagation.
PULSE TechnologyTM involves generation and detection of acoustic waves in opaque layers using ultrafast laser pulses. Its application in advanced semiconductor and packaging industry for single and multi-layer thin film metrology is presented.
We experimentally realize a patterned hyperbolic metafilm with engineered and freely tunable absorption band from near-IR to mid-IR spectral regions based on multilayered metal/dielectric hyperbolic metamaterial waveguide taper.
The fluorescence is experimentally controled with bandgap engineering of structured metal surface. Grating duty ratio is optimized as 3/4 and narrow emission spectra are obtained by coupling between Fabry-Pérot cavity and surface plasmon polariton modes.
We report on experimental and theoretical results on EELS from 12nm single-crystal gold films. Our results show that momentum resolution of the electrons gives insight into signatures of non-locality and quantum nature of the excitations.
We have developed a room temperature, broadband, and polarization-sensitive terahertz detector based on a p-n junction film of highly aligned and ultralong carbon nanotubes. Direct thermoelectric measurements demonstrate the photothermoelectirc nature of the detection mechanism
Utilizing laser-induced surface bubbles on a metal film, we demonstrate a reconfigurable plasmonic lens in a microfluidic environment to achieve divergence, collimation, and focusing of surface plasmons.
Photoluminescence (PL) from Ge1−xSnx grown on Si by CVD was investigated for Sn composition of 0.9, 3.2, 6, and 7%, respectively. The direct and indirect band transitions were analyzed at different temperatures.
Localized laser heating of amorphous Si deposited on LiNbO3 results in crystallization of the Si over-layer and the formation of a waveguide in the LiNbO3 substrate that supports guided modes in the visible and IR.
We demonstrate a colloidally synthesized plasmonic platform for giant fluorescence enhancement and increased spontaneous emission rate of embedded fluorophores. A transition between fluorescence enhancement and quenching is revealed depending on the plasmonic resonance.
We demonstrate a new technique for fabricating terahertz plasmonic structures that incorporates a spatial variation into the conductivity of the metallic layer using inkjet printing of a conductive and resistive ink simultaneously.
We demonstrate THz spectroscopy of mM BSA solutions using the long-range guided mode as an alternative approach to traditional transmission and reflection concepts. The cm propagation lengths pave the way for integrating field-enhancing resonating structures.
We experimentally demonstrate that an array of subwavelength channels with a spiral size distribution milled in a metal film can be used to manipulate the phase front of light beam and produce a vortex beam.
Analysis of the relationship between the microscopic conductivity, morphology represented by percolation degree and terahertz transmission spectra allowed us to retrieve microscopic properties of several nanostructured materials from measurements by terahertz spectroscopy.
We report a passively Q-switched 1.9 µm thulium ZBLAN waveguide laser based on an extended cavity containing a flake-graphene saturable absorber film. The 790nm diode-laser-pumped laser produces up to 6 mW with ∼1.4 µs pulses at ∼25 kHz.
We present a chiral single-arm relief on a micro-meter scale formed in an azo-polymer film by the irradiation of a green optical vortex. A 2-dimensional chiral relief array was also fabricated in the azo-polymer film.
DNA sequencing currently lacks optical based techniques such as Raman spectroscopy. We have identified previous issues that prevented sequencing with Raman measurements and proposed a solution for base pair identification via surface enhanced Raman spectroscopy.
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