Fano Resonance between Mie and Bragg Scattering in Photonic Crystals
Fano Resonance between Mie and Bragg Scattering in Photonic Crystals
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DOI：
10.1103/physrevlett.103.023901
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发表时间：
2009-07-10
影响因子：
8.6
通讯作者：
Limonov, M. F.
中科院分区：
文献类型：
--
作者：
Rybin, M. V.;Khanikaev, A. B.;Limonov, M. F.
报道了在人造蛋白石光子晶体中观察到连续米氏散射与窄布拉格能带之间的Fano共振现象。该共振导致透射谱显示具有不对称轮廓的布拉格凹陷，该凹陷可以可调地反转为布拉格上升。Fano不对称性参数与填充物的介电常数和由蛋白石基质确定的比值之间的介电对比度有关。Fano共振的存在与α-SiO(2)蛋白石微球的不均匀无序直接相关。理论“准三维”模型的计算结果与实验数据吻合较好。
We report the observation of a Fano resonance between continuum Mie scattering and a narrow Bragg band in synthetic opal photonic crystals. The resonance leads to a transmission spectrum exhibiting a Bragg dip with an asymmetric profile, which can be tunably reversed to a Bragg rise. The Fano asymmetry parameter is linked with the dielectric contrast between the permittivity of the filler and the specific value determined by the opal matrix. The existence of the Fano resonance is directly related to disorder due to nonuniformity of a-SiO(2) opal spheres. The theoretical "quasi-3D" model produces results in excellent agreement with the experimental data.