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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 19618–19627

Distributed gain in plasmonic reflectors and its use for terahertz generation

O. Sydoruk, R. R. A. Syms, and L. Solymar  »View Author Affiliations

Optics Express, Vol. 20, Issue 18, pp. 19618-19627 (2012)

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Semiconductor plasmons have potential for terahertz generation. Because practical device formats may be quasi-optical, we studied theoretically distributed plasmonic reflectors that comprise multiple interfaces between cascaded two-dimensional electron channels. Employing a mode-matching technique, we show that transmission through and reflection from a single interface depend on the magnitude and direction of a dc current flowing in the channels. As a result, plasmons can be amplified at an interface, and the cumulative effect of multiple interfaces increases the total gain, leading to plasmonic reflection coefficients exceeding unity. Reversing the current direction in a distributed reflector, however, has the opposite effect of plasmonic deamplification. Consequently, we propose structurally asymmetric resonators comprising two different distributed reflectors and predict that they are capable of terahertz oscillations at low threshold currents.

© 2012 OSA

OCIS Codes
(230.4910) Optical devices : Oscillators
(240.6680) Optics at surfaces : Surface plasmons
(260.3090) Physical optics : Infrared, far

ToC Category:
Optics at Surfaces

Original Manuscript: May 23, 2012
Revised Manuscript: June 29, 2012
Manuscript Accepted: July 2, 2012
Published: August 13, 2012

O. Sydoruk, R. R. A. Syms, and L. Solymar, "Distributed gain in plasmonic reflectors and its use for terahertz generation," Opt. Express 20, 19618-19627 (2012)

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