Theoretical and experimental studies of metal-infiltrated opals
Theoretical and experimental studies of metal-infiltrated opals
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DOI：
10.1103/physrevb.71.165114
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发表时间：
2005-04
影响因子：
3.7
通讯作者：
A. L. Pokrovsky;V. Kamaev;C. Y. Li;Z. Vardeny;A. Efros;D. A. Kurdyukov;V. Golubev
中科院分区：
文献类型：
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作者：
A. L. Pokrovsky;V. Kamaev;C. Y. Li;Z. Vardeny;A. Efros;D. A. Kurdyukov;V. Golubev
用解析、数值和实验的方法研究了金属渗入的人造蛋白石在可见光和红外光谱范围内的光学性质。为了定性地理解金属光子晶体中电磁波的色散，提出了一个简单的弱相互作用谐振腔模型。在理想金属渗入蛋白石的近似下，该模型是精确的，并且金属蛋白石中传播模的频率接近于单个球谐振腔的本征频率。数值计算了几种金属的基于金属介电常数色散的光子能带结构，结果与理想金属模型相似。计算了薄膜金属蛋白石的反射率和透射率。低频段反射率光谱的增长和饱和是全向带隙的表现。反射率的最小值和透射谱的最大值对应于截止频率的位置。制备了银和铜渗透的蛋白石，并测量了它们在可见光到中红外光谱范围内的反射率光谱。这些光谱与理论计算符合得很好。
The optical properties of metal-infiltrated synthetic opals have been studied analytically, numerically, and experimentally in the visible and infrared spectral ranges. A simple model of weakly interacting resonant cavities is proposed to qualitatively understand the dispersion of electromagnetic waves in metallic photonic crystals. In the approximation of an ideal metal infiltrated into opals this model is exact, and the frequencies of the propagating modes in metallic opals are close to the eigenfrequencies of a single spherical resonator. Photonic band structures based on the dispersion of a metal dielectric constant have been calculated numerically for several metals and show similarity with the ideal metal model. Reflectivity and transmission spectra of thin-film metallic opals are calculated. Growth and saturation of the reflectivity spectra at low frequencies are manifestations of the omnidirectional band gap. The sharpest minimum in the reflectivity and maximum in the transmission spectra correspond to the position of the cutoff frequency. Silver- and copper-infiltrated opals were fabricated and their reflectivity spectra were measured in the visible to mid-IR spectral range. These spectra are in a good agreement with the theoretical calculations.