Appl. Phys. Lett. 110, 162101 (2017); https://doi.org/10.1063/1.4981397
Abstract:
A method to enhance the responsivity of a transistor terahertz (THz) detector by introducing a Fabry-Pérot (FP) cavity was proposed. A theoretical model for the voltage responsivity of the transistor THz detector with a resonant cavity was derived and verified experimentally using a GaN high electron mobility transistor (HEMT) with the FP cavity formed between the GaN HEMT substrate and an indium tin oxide mirror. The measured detector responsivity shows 2.5 times enhancement compared to the device without the cavity and lower noise equivalent power. The performance of the GaN HEMT THz detector with a FP cavity, which has a designed quality factor of 16, is dependent on the incident angle of the THz radiation.
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Funding Info:
This research was supported by the National Research Foundation Singapore through the Singapore MIT Alliance for Research and Technology's LEES IRG Research Programme. Tomás Palacios would like to acknowledge the partial support from the ONR PECASE and the ONR FATE MURI programs.
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This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Appl. Phys. Lett. 110, 162101 (2017); and may be found at https://doi.org/10.1063/1.4981397