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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 28, Iss. 11 — Nov. 1, 2011
  • pp: 2650–2655

Light trapping within the grooves of 1D diffraction gratings under monochromatic and sunlight illumination

Mario M. Jakas and Francisco Llopis  »View Author Affiliations


JOSA B, Vol. 28, Issue 11, pp. 2650-2655 (2011)
http://dx.doi.org/10.1364/JOSAB.28.002650


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Abstract

The Rayleigh-Modal method is used to calculate the electromagnetic field within the grooves of a perfectly conducting, rectangular-shaped one-dimensional diffraction grating. An enhancement coefficient (η) is introduced in order to quantify such an energy concentration. Accordingly, η > 1 means that the amount of electromagnetic energy present within the grooves is larger than that one will have, over the same volume, if the diffraction grating is replaced by a perfectly reflecting mirror. The results in this paper show that η can be as large as several decades at certain, often narrow, ranges of wavelengths. However, it reduces to approximately 20% under sunlight illumination. In this latter case, such values are achieved when the optical spacing between the grooves d n is greater than 500 nm , where d is the groove spacing and n is the refractive index of the substance within the grooves. For d n smaller than 500 nm the enhancement coefficient turns negligibly small.

© 2011 Optical Society of America

OCIS Codes
(040.5350) Detectors : Photovoltaic
(050.1950) Diffraction and gratings : Diffraction gratings
(350.6050) Other areas of optics : Solar energy

ToC Category:
Diffraction and Gratings

History
Original Manuscript: June 3, 2011
Revised Manuscript: September 7, 2011
Manuscript Accepted: September 7, 2011
Published: October 12, 2011

Citation
Mario M. Jakas and Francisco Llopis, "Light trapping within the grooves of 1D diffraction gratings under monochromatic and sunlight illumination," J. Opt. Soc. Am. B 28, 2650-2655 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-11-2650

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