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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 5957–5967

The phase shift of light scattering at sub-wavelength dielectric structures

Yiling Yu and Linyou Cao  »View Author Affiliations


Optics Express, Vol. 21, Issue 5, pp. 5957-5967 (2013)
http://dx.doi.org/10.1364/OE.21.005957


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Abstract

We present a new theoretical analysis for the light scattering at sub-wavelength dielectric structures. This analysis can provide new intuitive insights into the phase shift of the scattered light that cannot be obtained from the existing approaches. Unlike the traditional analytical (e.g. Mie formalism) and numerical (e.g. FDTD) approaches, which simulate light scattering by rigorously matching electromagnetic fields at boundaries, we consider sub-wavelength dielectric structures as leaky resonators and evaluate the light scattering as a coupling process between incident light and leaky modes of the structure. Our analysis indicates that the light scattering is fundamentally dictated by the eigenvalue of the leaky modes. It indicates that the upper limit for the scattering efficiency of a cylindrical cylinder in free space is 4n, where n is the refractive index. It also indicates that the phase shift of the forward scattered light at dielectric structures can only cover half of the phase space [0, 2π], but backward scattering can provide a full phase coverage.

© 2013 OSA

OCIS Codes
(260.5740) Physical optics : Resonance
(160.4236) Materials : Nanomaterials
(290.5825) Scattering : Scattering theory

ToC Category:
Scattering

History
Original Manuscript: November 22, 2012
Revised Manuscript: February 18, 2013
Manuscript Accepted: February 21, 2013
Published: March 4, 2013

Citation
Yiling Yu and Linyou Cao, "The phase shift of light scattering at sub-wavelength dielectric structures," Opt. Express 21, 5957-5967 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-5-5957


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