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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 17 — Aug. 21, 2006
  • pp: 7709–7722

Optical impedance of metallic nano-structures

M. Mazilu and K. Dholakia  »View Author Affiliations


Optics Express, Vol. 14, Issue 17, pp. 7709-7722 (2006)
http://dx.doi.org/10.1364/OE.14.007709


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Abstract

Impedance matching refers to the suppression of reflected radiation from an interface and is a concept that applies right across the electromagnetic spectrum. In particular it has come to prominence in relation to the propagation of light in metallic structures and associated meta-materials. Whilst established for microwaves and electrical circuits, this concept has only very recently been observed in the optical domain, yet is not well defined or understood. We present a framework to elucidate the concept of optical impedance. We describe using a scattering matrix approach the characteristic, iterative, image and wave impedances of an optical system. With a numerical model, we explore each form of impedance matching in metal-dielectric structures. Thin gold layers may extend the concept of Brewster’s angle to normal incidence and s polarization. Optical impedance for recently realized metallic gold nano-pillars which has shown negative permeability is also explored and we show that current measurements are inconclusive to robustly state its characteristic impedance is matched to the vacuum.

© 2006 Optical Society of America

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(260.3910) Physical optics : Metal optics

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: July 12, 2006
Revised Manuscript: August 8, 2006
Manuscript Accepted: August 8, 2006
Published: August 21, 2006

Citation
M. Mazilu and K. Dholakia, "Optical impedance of metallic nano-structures," Opt. Express 14, 7709-7722 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-17-7709


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