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首页> 外文期刊>Physical review >Selective manipulation of stop-bands in multi-component photonic crystals: Opals as an example
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Selective manipulation of stop-bands in multi-component photonic crystals: Opals as an example

机译：多组分光子晶体中阻带的选择性操纵：以蛋白石为例

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We report on a comprehensive theoretical and experimental study of stop-band switching in photonic crystals. The suggested principles of light control are based on new Bragg diffraction effects discovered in multi-component periodic structures. The described analytical approach allows a detailed study of selective switching of (hkl) stop-bands by varying the permittivity of the components or the lattice parameters. For two-component photonic crystals, we showed two possible switching-off regimes. In the first regime, all of the stop-bands may only be simultaneously switched off if the certain matching conditions for permittivities are satisfied. In contrast, in the second regime, one can selectively switch off a preferred stop-band by adjusting the structural parameters irrespective of the permittivity values. For multi-component crystals, the on/off switching of stop-bands has a quasiperiodic resonant character. In the absence of resonance conditions, an (hkl) stop-band can be selectively switched by tuning the permittivity of the structural components, whereas at the resonance, a photonic stop-band cannot be switched off by changing the permittivity. A proper choice of the structural and dielectric parameters can create a resonance photonic band determining the Bragg wavelengths, to which a photonic crystal can never be transparent. The theoretical results were experimentally tested on classical photonic crystals, opals. Selective switching of stop-bands was studied by immersion-resolved and polarization-resolved spectroscopy. We found that opals possess all predictable properties of multi-component structures due to inhomogeneity of the constituent a-SiO_2 spheres.
机译：我们报告了光子晶体中阻带切换的全面理论和实验研究。建议的光控制原理是基于在多组分周期结构中发现的新的布拉格衍射效应。所描述的分析方法允许通过改变分量的介电常数或晶格参数来详细研究（hkl）阻带的选择性切换。对于两组分的光子晶体，我们显示了两种可能的截止状态。在第一种情况下，只有在满足一定的介电常数匹配条件的情况下，才能同时关闭所有阻带。相反，在第二种情况下，可以通过调节结构参数而与介电常数值无关地选择性地关闭优选的阻带。对于多组分晶体，阻带的开/关切换具有准周期谐振特性。在没有共振条件的情况下，可以通过调节结构部件的介电常数来选择性地切换（hkl）阻带，而在共振时，不能通过改变介电常数来关闭光子阻带。适当选择结构和介电参数会产生确定布拉格波长的共振光子带，光子晶体永远不会透明。理论结果在经典的光子晶体蛋白石上进行了实验测试。通过浸没-分辨和偏振-分辨光谱研究了阻带的选择性切换。我们发现蛋白石由于组成a-SiO_2球的不均匀性而具有多组分结构的所有可预测特性。

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