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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 19, Iss. 4 — Apr. 1, 2002
  • pp: 695–701

Numerical analysis of plasmon-resonance absorption in bisinusoidal metal gratings

Toyonori Matsuda, Daqing Zhou, and Yoichi Okuno  »View Author Affiliations

JOSA A, Vol. 19, Issue 4, pp. 695-701 (2002)

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We numerically investigate plasmon-resonance absorption of incident light energy by a bisinusoidal metal grating, i.e., one whose surface profile is sinusoidally corrugated in two orthogonal directions with a common period. Employing Yasuura’s modal expansion method, we solve the problem of plane-wave diffraction by the grating and evaluate the absorption, which is observed as dips in diffraction efficiency curves. We examine the field distribution and energy flow in detail at the angles of incidence at which the absorption occurs. We show that the absorption is caused by coupling of the TM component of an evanescent order with surface plasmons. A phase-matching condition is used in the prediction of the incident angle at which the absorption occurs. This, together with the field profile in the presence of the resonance absorption, explains the mechanism of the absorption. We then illustrate interesting features of the absorption: enhancement of polarization conversion between the incident light and the reflected light and simultaneous excitation of two plasmon waves in directions that are symmetric with respect to the plane of incidence.

© 2002 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons

Original Manuscript: April 3, 2001
Revised Manuscript: July 24, 2001
Manuscript Accepted: August 30, 2001
Published: April 1, 2002

Toyonori Matsuda, Daqing Zhou, and Yoichi Okuno, "Numerical analysis of plasmon-resonance absorption in bisinusoidal metal gratings," J. Opt. Soc. Am. A 19, 695-701 (2002)

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