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Proceedings Paper

Subwavelength, multimode, tunable plasmonic terahertz lenses and detectors
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Paper Abstract

We report on sub-wavelength THz plasmonic lenses based on 2 dimensional electron gas (2DEG) at AlGaN/GaN interface and also on few-layer graphene sheets. Circular gratings investigated in this study concentrate THz electric field into deep sub-wavelength scale by plasmonic excitations polarization independently. Propagation of a broadband pulse of EM waves in 0.5-10 THz was simulated by using a commercial FDTD simulation tool. The results show that concentric plasmonic grating structures can be used to concentrate THz into deep sub-wavelength down to λ/350 spot size and achieve very large field enhancements by plasmonic confinement which can be used for THz detection and possibly for sub-wavelength imaging. Electric field intensity under the central point can be orders of magnitude higher than the outer grating area. Moreover, plasmonic lens modes supported by system can be tuned with an applied voltage to gratings.

Paper Details

Date Published: 9 May 2012
PDF: 8 pages
Proc. SPIE 8363, Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense, 83630L (9 May 2012); doi: 10.1117/12.919372
Show Author Affiliations
Mustafa Karabiyik, Florida International Univ. (United States)
Chowdhury Al-Amin, Florida International Univ. (United States)
Santanu Das, Florida International Univ. (United States)
Nezih Pala, Florida International Univ. (United States)
Won Bong Choi, Florida International Univ. (United States)

Published in SPIE Proceedings Vol. 8363:
Terahertz Physics, Devices, and Systems VI: Advanced Applications in Industry and Defense
A. F. Mehdi Anwar; Nibir K. Dhar; Thomas W. Crowe, Editor(s)

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