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We report our design and fabrication of superconducting nanowire single-photon detectors integrated with gold plasmonic nanostructures, which can enhance the absorption of TM-polarized light, and can enlarge the effective area without sacrificing detector speed.
A tunable hollow waveguide with distributed Bragg reflector (DBR) mirror and a high-index-contrast-grating (HCG) mirror has been proposed. We numerically show the possibility of 2D-confinement and reduction in polarization-dependence of the proposed hollow waveguide.
We demonstrate a compact silicon-on-insulator wavelength division multiplexer. The device supports 21 channels, has 1 nm channel spacing and less than -10 dB crosstalk.
A blazed grating is used for the separation of single photons from photon pairs. The Fraunhofer far field of the two-photon rate depends on the spatial correlation strength of the photons and enables correlation characterizations.
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.
In this work we show how the spectral properties of the pump are transferred to signal and idler in a mirrorless optical parametric oscillator and that the idler properties strongly depend on the grating vector.
A novel ultra-low loss single-mode hollow-core waveguide using high-contrast grating (HCG) is proposed and simulated. The loss can be as low as 0.006 dB/m, three orders of magnitude lower than the state-of-art chip-scale waveguides.
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 pronounced light-induced change of the optical activity at terahertz frequency in metal chiral gratings on semiconductor substrates. This result opens new horizons in the active terahertz polarization control.
The fabrication of a reduced phase error, distributed feedback fiber laser in erbium-doped fiber is presented. Using the Trace Grating technique, the overall phase error has been reduced by a factor of 2.5.
Using polarization spectroscopy to control the shape of the diode current ramp while tuning an external cavity diode laser we achieved mode-hop free tuning of up to 105 GHz with an uncoated, off-the-shelf laser diode.
We have generated the backward terahertz pulses with record-high average powers of 2.3-11 muW and narrowest bandwidth of 6 GHz from multi-grating periodically-poled lithium niobate by optical rectification at room temperature.
Surface-plasmon-polariton-enhanced fluorescence from CdSe/ZnS quantum dots (QD) deposited onto patterned gold/PMMA substrates has been observed, and the enhancement related to QD position with regard to the type of surface and nanostructures.
We show that the retracing behavior based in slant-stripe-type periodically-poled RbTiOPO4 can be used to efficiently achieve second-harmonic generation within an ultra-wide spectral range of 1.7-4.0 mum.
We introduce novel method of precise compressor alignment for Petawatt-scale CPA lasers. The method is using compressor gratings as gratings of diffraction interferometer. It meets accuracy requirements (~10-5) and allows simple procedures of alignment.
Mid-infrared beam shaping is demonstrated by using grating coupled surface emitting quantum cascade ring lasers. The devices allow for far-field tuning, ranging from highly symmetric spot-to ring-shaped beam patterns, depending on the grating period.
Using the excitation of a Bloch Surface Wave (BSW), we demonstrate a 45-fold diffraction enhancement for a protein grating printed on a-SiN:H multilayers. This may lead to a new generation of high sensitivity diffraction-based biosensors.
We demonstrate an Er doped fiber laser line source whose output coupler is a 9 cm, 45deg tilted fiber grating. Our approach shows potential for improved efficiency and simplicity over previously described line sources.
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