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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 9 — Sep. 26, 2007

Observation and modeling of polarized light from scarab beetles

Sam Lowrey, Lakshman De Silva, Ian Hodgkinson, and John Leader  »View Author Affiliations

JOSA A, Vol. 24, Issue 8, pp. 2418-2425 (2007)

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The light reflected from scarab beetles illuminated with unpolarized white light is analyzed ellipsometrically and displayed as the sum of an elliptically polarized spectrum I p and an unpolarized spectrum I u . A chirped stack of chiral resonators, each with a characteristic Bragg wavelength and partial realignment of birefringent material to a fixed axis, is proposed as a model for simulation of both reflection and polarization spectra. Possible mechanisms that effectively eliminate impedance mismatch at the air–elytron interface and allow some beetles to exhibit nearly perfect circularly polarized reflections are discussed. Results are presented for three representative beetles, Ischiosopha bifasciata, which is shown to be a narrowband left-circular polarizer; Chrysophora chrysochlora, a broadband left-circular polarizer; and Chrysina woodi, an elliptical polarizer. The methods that are developed are applicable to the more general problem of synthesis of reflectors with prescribed reflection and polarization spectra.

© 2007 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(260.1440) Physical optics : Birefringence
(260.2130) Physical optics : Ellipsometry and polarimetry
(260.5430) Physical optics : Polarization
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Physical Optics

Original Manuscript: November 14, 2006
Manuscript Accepted: March 6, 2007
Published: July 11, 2007

Virtual Issues
Vol. 2, Iss. 9 Virtual Journal for Biomedical Optics

Sam Lowrey, Lakshman De Silva, Ian Hodgkinson, and John Leader, "Observation and modeling of polarized light from scarab beetles," J. Opt. Soc. Am. A 24, 2418-2425 (2007)

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