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Recently, we have verified an inter-valley scattering free avalanche photodiode (APD) by using GaN/AlN periodically stacked structure (PSS). High linear-mode gain and extremely low excess noise have been achieved in a prototype GaN (10 nm)/ AlN (10 nm) PSS APD. In this letter, device optimization is investigated theoretically. Gains and excess noises are simulated in PSS APDs with different periodical...
This paper introduces the use of artificial neural networks (ANNs) as a method to guide the design of high-performance MEMS resonators and applies it to the prediction of spurious modes (SMs) in the proximity of the series resonance of aluminum nitride (AlN) contour-mode MEMS resonators (CMRs). ANN enables both fast and accurate prediction of spurious modes, hence facilitating the MEMS designer in...
Spurious modes (SMs) result in in-band ripples and degrade the out-of-band rejection of filters, thus impeding the synthesis of high performance filters with MEMS resonators. Therefore, the ability to predict the presence of SMs in specific resonator geometries is highly desired and different techniques have been explored such as: 1-D/2-D analytic models, and 2-D/3-D finite element methods (FEM)....
The influence of superlattice periods and well doping on the band structure and distribution of electrons for III-nitride intersubband photodetectors are theoretically studied. It is found that there are more wells populated with electrons with the increase of superlattice periods and doping concentration. This knowledge is beneficial to improve the intersubband absorption efficiency, providing theoretical...
Integrating nanoscale electromechanical transducers and nanophotonic devices potentially can enable new acousto-optic devices to reach unprecedented high frequencies and modulation efficiency. We demonstrate acousto-optic modulation of a photonic crystal nanocavity using acoustic waves with frequency up to 19 GHz, reaching the microwave K band. Both the acoustic and photonic devices are fabricated...
Optical race-track resonators and one-dimensional photonic crystal cavities are integrated with surface acoustic wave devices on a suspended piezoelectric aluminum nitride film to realize strong, ultrafast sound-light interaction.
Inter-digital transducers and photonic crystal cavities are integrated on a piezoelectric aluminum nitride film sputtered on an oxidized silicon wafer, which leads to the first demonstration of microwave frequency traveling surface acoustic wave induced transparency.
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