Journal
OPTICS EXPRESS
Volume 15, Issue 7, Pages 4351-4358Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.15.004351
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Funding
- Biotechnology and Biological Sciences Research Council [JF16983, BB/E000177/1] Funding Source: researchfish
- BBSRC [BB/E000177/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/E000177/1, JF16983] Funding Source: Medline
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In this study we apply an existing optical characterisation technique to establish reliably the complex refractive indices of layers comprising a natural multilayer reflector in the beetle Chrysochroa raja. Its reflector characteristics, ultrastructure and layer thicknesses were established using electron and optical microscopy. We recorded a significant number of wavelength dependent optical data sets from the same regions of sample using both linear polarisations and from a variety of different angles. These optical data sets were modelled simultaneously in order to significantly reduce the degeneracy of the fitting process. For the C. raja sample in question, the fitted complex refractive indices of both layer types were determined to be n = 1.68 k = 0.03 and n = 1.55 k = 0.14. (c) 2007 Optical Society of America.
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