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Proceedings Paper

Enhancement of optics-to-THz conversion efficiency by metallic slot waveguides
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Paper Abstract

A metallic slot waveguide, with a dielectric strip embedded within, is investigated for the purpose of enhancing the optics-to-THz conversion efficiency using the difference-frequency generation (DFG) process. To describe the frequency conversion process in such lossy waveguides, a fully-vectorial coupled-mode theory is developed. Using the coupled-mode theory, we outline the basic theoretical requirements for efficient frequency conversion, which include the needs to achieve large coupling coefficients, phase matching, and low propagation loss for both the optical and THz waves. Following these requirements, a metallic waveguide is designed by considering the trade-off between modal confinement and propagation loss. Our numerical calculation shows that the conversion efficiency in these waveguide structures can be more than one order of magnitude larger than what has been achieved using dielectric waveguides. Based on the distinct impact of the slot width on the optical and THz modal dispersion, we propose a two-step method to realize the phase matching for general pump wavelengths.

Paper Details

Date Published: 18 February 2010
PDF: 10 pages
Proc. SPIE 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX, 75820W (18 February 2010); doi: 10.1117/12.840088
Show Author Affiliations
Zhichao Ruan, Stanford Univ. (United States)
Georgios Veronis, Louisiana State Univ. (United States)
Konstantin L. Vodopyanov, Stanford Univ. (United States)
Martin M. Fejer, Stanford Univ. (United States)
Shanhui Fan, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 7582:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX
Peter E. Powers, Editor(s)

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