A photomixer-based THz-wave emitter having linear polarization characteristics was developed by integrating a unitraveling- carrier photodiode (UTC-PD) and a self-complementary reflection-symmetry antenna. The fabricated module was operated at frequencies from 120 GHz to 2.6 THz, and the typical level of output power was 2.8 μW at 1 THz for a photocurrent of 9 mA at a bias voltage of -0.4 V. It also exhibited stable principal polarization axis angles within ±1° at frequencies from 200 GHz to 2 THz, and the generated signals were linearly polarized with extinction ratios below 5% at frequencies from 200 to 800 GHz. The fabricated module was successfully applied to sub-THz-wave ellipsometry without using an external polarizer.

Date Published: 5 September 2014
PDF: 8 pages
Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 919908 (5 September 2014); doi: 10.1117/12.2060986

Published in SPIE Proceedings Vol. 9199:
Terahertz Emitters, Receivers, and Applications V
Manijeh Razeghi; Alexei N. Baranov; John M. Zavada; Dimitris Pavlidis, Editor(s)