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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 65, Iss. 3 — Mar. 1, 1975
  • pp: 267–270

Limit of the moth’s eye principle and other impedance-matching corrugations for solar-absorber design

B. S. Thornton  »View Author Affiliations

JOSA, Vol. 65, Issue 3, pp. 267-270 (1975)

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The moth’s eye principle of optical-impedance matching by means of an array of tapered protuberances has been studied to determine the limit obtainable for reflection reduction. Analogous multilayer equivalents were optimized over a wide band, using a recently developed optimization method, in which one or more of the layers are specified inclusions. A limit of 30 dB reduction of reflectance was obtained over a bandwidth 1.4 times the short-wavelength limit of the band. These results are also related to corrugated conducting surfaces used in a new solar-absorber design that uses corrugations in a conductor and is required to be optimized for best absorption (a) and emissivity (e) values. The optimum corrugation geometry for two types of periodic surface is studied and results are discussed in view of further development in practical applications.

B. S. Thornton, "Limit of the moth’s eye principle and other impedance-matching corrugations for solar-absorber design," J. Opt. Soc. Am. 65, 267-270 (1975)

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