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Proceedings Paper

THz photomixer with a 40nm-wide nanoelectrode gap on low-temperature grown GaAs
Author(s): G. Seniutinas; G. Gervinskas; E. Constable; A. Krotkus; G. Molis; G. Valušis; R. A. Lewis; S. Juodkazis
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Paper Abstract

A terahertz (THz or T-rays) photomixer consisting of a meander type antenna with integrated nanoelectrodes on a low temperature grown GaAs (LT-GaAs) is demonstrated. The antenna was designed for molecular fingerprinting and sensing applications within a spectral range of 0.3-0.4 THz. A combination of electron beam lithography (EBL) and focused ion beam (FIB) milling was used to fabricate the T-ray emitter. Antenna and nanoelectrodes were fabricated by standard EBL and lift-off steps. Then a 40-nm-wide gap in an active photomixer area separating the nanoelectrodes was milled by a FIB. The integrated nano-contacts with nano-gaps enhance the illuminated light and THz electric fields as well as contribute to a better collection of photo-generated electrons. T-ray emission power from the fabricated photomixer chips were few hundreds of nanowatts at around 0.15 THz and tens of nanowatts in the 0.3-0.4 THz range.

Paper Details

Date Published: 7 December 2013
PDF: 9 pages
Proc. SPIE 8923, Micro/Nano Materials, Devices, and Systems, 892322 (7 December 2013); doi: 10.1117/12.2033746
Show Author Affiliations
G. Seniutinas, Swinburne Univ. of Technology (Australia)
Australian National Fabrication Facility (Australia)
G. Gervinskas, Swinburne Univ. of Technology (Australia)
Australian National Fabrication Facility (Australia)
E. Constable, Univ. of Wollongong (Australia)
A. Krotkus, Ctr. for Physical Sciences and Technology (Lithuania)
G. Molis, Teravil Ltd. (Lithuania)
G. Valušis, Ctr. for Physical Sciences and Technology (Lithuania)
R. A. Lewis, Univ. of Wollongong (Australia)
S. Juodkazis, Swinburne Univ. of Technology (Australia)
Australian National Fabrication Facility (Australia)


Published in SPIE Proceedings Vol. 8923:
Micro/Nano Materials, Devices, and Systems
James Friend; H. Hoe Tan, Editor(s)

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