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Electrically Tunable Surface Plasmon Source for THz Applications

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7 Author(s)
Khoury, J. ; Air Force Res. Lab./Sensors Directorate, Hanscom Air Force Base, Bedford, MA, USA ; Haji-Saeed, B. ; Buchwald, W. ; Woods, C.
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In this paper, we propose a design for a widely tunable solid-state optically and electrically pumped terahertz source based on the Smith-Purcell free-electron laser. Our design consists of a thin dielectric layer sandwiched between an upper corrugated structure and a lower layer of thin metal, semiconductor, or high-electron-mobility material. The lower layer is for current streaming, which replaces the electron beam in the Smith-Purcell free-electron laser design. The upper layer consists of two microgratings for optical pumping, and a nanograting to couple with electrical pumping in the lower layer. The optically generated surface plasmon waves from the upper layer and the electrically induced surface plasmon waves from the lower layer are then coupled. Emission enhancement occurs when the plasmonic waves in both layers are resonantly coupled.

Published in:

Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:17 ,  Issue: 1 )

Date of Publication:

Jan.-Feb. 2011

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