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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 20, Iss. S1 — Jan. 2, 2012
  • pp: A141–A156

Transmission line equivalent circuit model applied to a plasmonic grating nanosurface for light trapping

Alessia Polemi and Kevin L. Shuford  »View Author Affiliations


Optics Express, Vol. 20, Issue S1, pp. A141-A156 (2012)
http://dx.doi.org/10.1364/OE.20.00A141


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Abstract

In this paper, we show how light absorption in a plasmonic grating nanosurface can be calculated by means of a simple, analytical model based on a transmission line equivalent circuit. The nanosurface is a one-dimensional grating etched into a silver metal film covered by a silicon slab. The transmission line model is specified for both transverse electric and transverse magnetic polarizations of the incident light, and it incorporates the effect of the plasmonic modes diffracted by the ridges of the grating. Under the assumption that the adjacent ridges are weakly interacting in terms of diffracted waves, we show that the approximate, closed form expression for the reflection coefficient at the air-silicon interface can be used to evaluate light absorption of the solar cell. The weak-coupling assumption is valid if the grating structure is not closely packed and the excitation direction is close to normal incidence. Also, we show the utility of the circuit theory for understanding how the peaks in the absorption coefficient are related to the resonances of the equivalent transmission model and how this can help in designing more efficient structures.

© 2011 OSA

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(160.4760) Materials : Optical properties
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Plasmonics

History
Original Manuscript: October 28, 2011
Revised Manuscript: December 13, 2011
Manuscript Accepted: December 16, 2011
Published: January 2, 2012

Citation
Alessia Polemi and Kevin L. Shuford, "Transmission line equivalent circuit model applied to a plasmonic grating nanosurface for light trapping," Opt. Express 20, A141-A156 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-S1-A141


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