Title

Long-Wave Infrared Surface Plasmon Grating Coupler

Abstract

We present a simplified analytic formula that may be used to design gratings intended to couple longwave infrared radiation to surface plasmons. It is based on the theory of Hessel and Oliner (1965). The recipe is semiempirical, in that it requires knowledge of a surface-impedance modulation amplitude, which is found here as a function of the grating groove depth and the wavelength for silver lamellar gratings at CO2 laser wavelengths. The optimum groove depth for photon-to-surface-plasmon energy conversion was found by experiment and calculation to be ∼10%-15% of the wavelength. This value is about twice what has been reported previously in the visible spectral range for sinusoidal grating profiles. © 2010 Optical Society of America.

Publication Date

6-1-2010

Publication Title

Applied Optics

Volume

49

Issue

16

Number of Pages

3102-3110

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.49.003102

Socpus ID

77956006651 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77956006651

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