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Proceedings Paper

Coherent phenomena in terahertz 2D plasmonic structures: strong coupling, plasmonic crystals, and induced transparency by coupling of localized modes
Author(s): Gregory C. Dyer; Gregory R. Aizin; S. James Allen; Albert D. Grine; Don Bethke; John L. Reno; Eric A. Shaner
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Paper Abstract

The device applications of plasmonic systems such as graphene and two dimensional electron gases (2DEGs) in III-V heterostructures include terahertz detectors, mixers, oscillators and modulators. These two dimensional (2D) plasmonic systems are not only well-suited for device integration, but also enable the broad tunability of underdamped plasma excitations via an applied electric field. We present demonstrations of the coherent coupling of multiple voltage tuned GaAs/AlGaAs 2D plasmonic resonators under terahertz irradiation. By utilizing a plasmonic homodyne mixing mechanism to downconvert the near field of plasma waves to a DC signal, we directly detect the spectrum of coupled plasmonic micro-resonator structures at cryogenic temperatures. The 2DEG in the studied devices can be interpreted as a plasmonic waveguide where multiple gate terminals control the 2DEG kinetic inductance. When the gate tuning of the 2DEG is spatially periodic, a one-dimensional finite plasmonic crystal forms. This results in a subwavelength structure, much like a metamaterial element, that nonetheless Bragg scatters plasma waves from a repeated crystal unit cell. A 50% in situ tuning of the plasmonic crystal band edges is observed. By introducing gate-controlled defects or simply terminating the lattice, localized states arise in the plasmonic crystal. Inherent asymmetries at the finite crystal boundaries produce an induced transparency-like phenomenon due to the coupling of defect modes and crystal surface states known as Tamm states. The demonstrated active control of coupled plasmonic resonators opens previously unexplored avenues for sensitive direct and heterodyne THz detection, planar metamaterials, and slow-light devices.

Paper Details

Date Published: 21 May 2014
PDF: 14 pages
Proc. SPIE 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense, 91020L (21 May 2014); doi: 10.1117/12.2053629
Show Author Affiliations
Gregory C. Dyer, Sandia National Labs. (United States)
Gregory R. Aizin, Kingsborough Community College (United States)
S. James Allen, Univ. of California, Santa Barbara (United States)
Albert D. Grine, Sandia National Labs. (United States)
Don Bethke, Sandia National Labs. (United States)
John L. Reno, Sandia National Labs. (United States)
Eric A. Shaner, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 9102:
Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense
Mehdi F. Anwar; Thomas W. Crowe; Tariq Manzur, Editor(s)

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