P R Stoddart et al 2006 Nanotechnology 17 680 doi:10.1088/0957-4484/17/3/011
Optical properties of chitin: surface-enhanced Raman scattering substrates based on antireflection structures on cicada wings
P R Stoddart1, P J Cadusch1, T M Boyce1, R M Erasmus2 and J D Comins2
Show affiliationsThe transparent wings of some cicada species present ordered arrays of papillary structures with a spacing of approximately 200 nm. These structures serve an antireflection function, with optical transmission peaking at a value of approximately 98% and rising above 90% over a broad band from 450 to 2500 nm. The dimensions of the papillae are comparable to the roughness scale of surface-enhanced Raman scattering (SERS) substrates. SERS measurements performed on silver- and gold-coated wings display enhancement factors of approximately 106 with no apparent background contribution from the wing.
- PACS
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78.66.Qn Polymers; organic compounds
61.46.-w Structure of nanoscale materials
33.20.Fb Raman and Rayleigh spectra (including optical scattering)
- Subjects
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Soft matter, liquids and polymers
- Dates
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Issue 3 (14 February 2006)
Received 7 October 2005
Published 6 January 2006
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Optical properties of chitin: surface-enhanced Raman scattering substrates based on antireflection structures on cicada wings
P R Stoddart et al 2006 Nanotechnology 17 680
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