Interplay of index contrast with periodicity in polymer photonic crystals

Finlayson, C. E.; Haines, A. I.; Snoswell, D. R. E.; Kontogeorgos, A.; Vignolini, Silvia; Baumberg, J. J.; Spahn, P.; Peter Hellmann, G.

doi:10.1063/1.3672215

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Interplay of index contrast with periodicity in polymer photonic crystals

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Finlayson, C. E., Haines, A. I., Snoswell, D. R. E., Kontogeorgos, A., Vignolini, S., Baumberg, J. J., et al. (2011). Interplay of index contrast with periodicity in polymer photonic crystals. Applied Physics Letters, 99(26): 261913. doi:10.1063/1.3672215.

Cite as: https://hdl.handle.net/21.11116/0000-000B-FA8A-0

Abstract

We report how the strength of resonant Bragg reflection from polymeric photonic crystals (polymer opals) varies linearly with the refractive-index contrast, n, in contrast to the quadratic buildup of Fresnel reflections scaling as (Δn) 2. This occurs due to the interplay of disorder and periodicity, in agreement with a simple 1-dimensional periodic model. Goniometry experiments show that opal films exhibit cones of resonantly scattered light, which extend to ±20° angular deviation from the specular direction. The intensity of the scattering cones varies super-linearly with n. Such medium contrast photonic crystals are of significant interest for understanding structural colors exhibited in nature, by structures with inherent disorder. © 2011 American Institute of Physics.