نتایج جستجو برای: photomixer
تعداد نتایج: 60 فیلتر نتایج به سال:
Nano-antenna in a photoconductive photomixer for highly efficient continuous wave terahertz emission
A compact, narrow-linewidth, tunable source of THz radiation has been developed for spectroscopy and other high-resolution applications. Distributed-Bragg-reflector ~DBR! diode lasers at 850 nm are used to pump a low-temperature-grown GaAs photomixer. Resonant optical feedback is employed to stabilize the center frequencies and narrow the linewidths of the DBR lasers. The heterodyne linewidth f...
We demonstrate an integrated distributed feedback (DFB) laser array as a dual-wavelength source for narrowband terahertz (THz) generation. The laser array is composed of four heterogeneously integrated III-V-on-silicon DFB lasers with different lengths enabling dual-mode lasing tolerant to process variations, bias fluctuations, and ambient temperature variations. By optical heterodyning the two...
A method to reduce the transit time of majority of carriers in photomixers and photo detectors to < 1 ps is proposed. Enhanced optical fields associated with surface plasmon polaritons, coupled with velocity overshoot phenomenon results in net decrease of transit time of carriers. As an example, model calculations demonstrating > 280× (or ∼2800 and 31.8 μW at 1 and 5 THz respectively) improveme...
reflector laser diodes is split in half and fiber coupled to each photomixer. Each LTG-GaAs photomixer consists of a 20 Fm X 20 pm active region with 0.2-km-wide interdigitated electrodes spaced by0.6 pm for the transmitter and by 0.4 p m for th,e receiver. The transmitter is dc biased through a broadband bias tee and therefore develops an ac current across the electrodes when the photoconducta...
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