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Three terahertz (THz) GaAs/AlGaAs quantum-well photodetectors with different 1-D metal gratings are fabricated for front-incident detection of THz waves. Photocurrent spectra are acquired and compared with 45° incident facet samples (without grating), and peak responsivities are determined with a calibrated blackbody radiation source. The results show that these gratings can couple THz waves into...
Wafer-scaled cost-effective technique for subwavelength structured (SWS) surface by means of anodic porous alumina masks directly formed on SiO2/Si substrates is demonstrated. Combined with ion beam etching and induced coupled plasma etching, SWS surface with a period of 100nm and a height of 200-300nm was achieved on 2 inch polished single crystalline Si wafer. A lower reflectivity below 6% was observed...
A novel bias-feeding photodetector is presented, suitable for dc-coupling with post-amplifiers or DEMUX-ICs, thus greatly reducing the RF coupling losses into subsequent electronics. The receiver module exhibits 90 GHz bandwidth and 107 Gb/s data rate capability.
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