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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8962–8972

Nearly perfect absorption in intrinsically low-loss grating structures

Ruey-Lin Chern and Wei-Ting Hong  »View Author Affiliations


Optics Express, Vol. 19, Issue 9, pp. 8962-8972 (2011)
http://dx.doi.org/10.1364/OE.19.008962


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Abstract

The feature of enhanced absorption in two-layered grating structures is theoretically investigated. The underlying structures make the most use of resonance mechanism to achieve a nearly perfect absorption in an intrinsically low-loss medium. For standalone gratings, the maximum absorption efficiency is shown to be 50%, which is attributed to the coupling of short range (bonding) or long range (antibonding) surface plasmons with cavity resonances. By attaching a dielectric slab on top or bottom to the metallic grating, the maximum absorption efficiency can be raised to nearly 100%. The presence of guided waves in the dielectric slab causes the strong concentration of fields and reinforces the absorption to its extreme value. The efficient absorption mechanism is illustrated with the pattern of resonance fields and the distribution of power loss density. A phenomenological theory is also used to characterize the absorption anomaly in terms of complex pole and zero.

© 2011 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(300.1030) Spectroscopy : Absorption

ToC Category:
Diffraction and Gratings

History
Original Manuscript: March 14, 2011
Revised Manuscript: April 10, 2011
Manuscript Accepted: April 14, 2011
Published: April 22, 2011

Citation
Ruey-Lin Chern and Wei-Ting Hong, "Nearly perfect absorption in intrinsically low-loss grating structures," Opt. Express 19, 8962-8972 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-9-8962


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