Topical Advisory Panel Members' Collection Series: "Terahertz Sensors"

Dear Colleagues,

In recent years, terahertz technology has developed rapidly and has shown a wide range of potential applications in the fields of communication, imaging, detection, and medicine. Terahertz (THz) waves have the properties of good coherence, high signal-to-noise ratio, and low radiation energy and are widely used in the field of sensing. This Special Issue aims to provide a comprehensive overview of terahertz sensors. We seek research articles and reviews that provide insight into terahertz sensors. Topics of interest include (but are not limited to):

• Sensing mechanisms;
• Terahertz physics;
• Gas and liquid sensors;
• THz imaging systems;
• Chemical sensors;
• Biomedical sensors;
• Fiber optic sensors;
• THz sensors and arrays;
• THz diffractive optics;
• Medical imaging.

Prof. Dr. Viktor Krozer
Prof. Dr. Andreas Penirschke
Guest Editors

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Title: Embedded_FET_for_high_sensitive_THz_Detection
Authors: A. Rämer #, Edoardo Nigri *, Eugen Dischke #, Serguei Chevchenko#, Hossein Yazdani#, Lars Schellhase#, Viktor Krozer #, Wolfgang Heinrich #
Affiliation: # Ferdinand-Braun-Institut (FBH), Germany * on leave from Universita degli Studie di Roma La Sapienza, Rome, Italy
Abstract: We demonstrate novel THz detectors using AlGaN/GaN HEMT device technology, which achieve excellent optical sensitivity and noise equivalent power and are monolithically integrated with various antenna structures. All designs feature best-in-class detection properties at room temperature and enable scaling to large two-dimensional arrays, allowing for the realization of THz camera chips. We show theoretical and experimental results for the THz detectors in the range 0.1 THz - 1.5 THz. Broadband detectors exhibit an optical sensitivity > 20 mA/W up to 1 THz with noise-equivalent power NEP < 100 pW/√Hz. The lowest optical NEP achieved is < 10 pW/√Hz at 175 GHz. The sensitivity and NEP values are improved when considering antenna and optical coupling losses.