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Broad green generation from 500 to 565nm was observed on chirped χ(2) nonlinear photonic crystals made of periodically-poled lithium tantalate (PPLT) with single pass up-conversion efficiency ∼10%. This was ascribed to simultaneous multi-wavelength SHG and SFG due to nonlinear interaction of (signal, idler) waves in the adiabatically chirped PPLT.
Filtering unwanted light signals is critical to the operation of neutral atom quantum memories. The addition of a novel frequency filter increases the non-classical correlations and readout efficiency of our quantum memory by ≈ 35% [1].
Plastic scintillators show several desired characteristics in dosimetry; especially tissue-equivalence is a definite advantage as an electrical personal dosimeter (EPD). The EPD based on an array-type Silicon Photomultiplier (SiPM) coupled to the polystyrene scintillator was proposed at the last time and has been improving. In this research, for the EPD application, the characteristics of plastic...
A 20nm thick Ni resistor element was fabricated on a 1µm thick, 400µm wide silicon nitride bridge via bulk micromachining. By applying a given power to the resistor its temperature increases, as the pressure decreases, since fewer gas particles are available to transfer heat away from the resistor. Rather than sensing the resistance change, a thin film thermocouple consisting of 20nm Ni and 20nm Cr...
Visible pump-probe spectroscopy isolates the femtosecond Drude response of a photogenerated electron-hole plasma in monolayer graphene. The observed Vn scaling versus carrier density reveals the relativistic nature of the electron-hole plasma.
We explore metallo-dielectric composite nanostructures for localization and resonant excitation of optical fields and investigate design, fabrication and testing of nanolasers. Integration with silicon photonics material platform is demonstrated.
We are constructing a 1 mm3 resolution, high sensitivity PET detector system with depth of interaction capability. The detectors are built from modules comprising LSO crystal arrays coupled to Position Sensitive Avalanche Photodiodes (PSAPDs). The entire system will have 4,608 densely packed dual LSO-PSAPD modules. The performance of the large area (1?1 cm2) PSAPDs in our system depends on bias voltage...
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