Interplay of index contrast with periodicity in polymer photonic crystals

被引：29

作者：

Finlayson, Chris E. ^{[1
]}

Haines, Andrew I. ^{[1
]}

Snoswell, David R. E. ^{[1
]}

Kontogeorgos, Andreas ^{[1
]}

Vignolini, Silvia ^{[1
]}

Baumberg, Jeremy J. ^{[1
]}

Spahn, Peter ^{[2
]}

Hellmann, G. Peter ^{[2
]}

机构：

[1] Univ Cambridge, Cavendish Lab, NanoPhoton Ctr, Cambridge CB3 0HE, England

[2] DKI, D-64289 Darmstadt, Germany

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 26期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1063/1.3672215

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report how the strength of resonant Bragg reflection from polymeric photonic crystals (polymer opals) varies linearly with the refractive-index contrast, Delta n, in contrast to the quadratic buildup of Fresnel reflections scaling as (Delta n)(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 degrees angular deviation from the specular direction. The intensity of the scattering cones varies super-linearly with Delta n. Such medium contrast photonic crystals are of significant interest for understanding structural colors exhibited in nature, by structures with inherent disorder. (C) 2011 American Institute of Physics. [doi:10.1063/1.3672215]

引用

页数：4

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