Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 14, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201900700
Keywords
detectors; gains; sensitivities; terajets
Funding
- Agencia Estatal de Investigacion [TEC2015-65477-R, TEC2016-78028-C3-3-P, RTI2018-097180-B-100]
- Consejeria de Educacion, Junta de Castilla y Leon [SA256P18]
- ERDF/FEDER
- Conselleria d'Educacio, lnvestigacio, Cultura i Esport
- Generalitat Valenciana [AIC0/2019/018]
- Japan Society for the Promotion of Science (JSPS)
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Herein, a simple terahertz (THz) receiver that uses subwavelength focusing of the THz beam on the detector area is proposed. As a proof of concept, a THz detection system with an original optical coupling scheme is implemented, where the signal to be detected is coupled to a THz detector through a mesoscale dielectric particle lens. Coherent detection is successfully demonstrated with an enhancement of the detector sensitivity of about 4.3 dB, compared with that of a direct detection system with the slight decreasing (approximate to 1.67 times) of noise equivalent power value. The results show that the proposed method can reduce the size and increase the sensitivity of various THz systems, including imaging, sensing, and ranging, which would enable significant progress in different fields such as physics, medicine, biology, astronomy, security, etc.
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