超材料
材料科学
电介质
光电子学
介电常数
光学
等离子体子
反射系数
谐振器
光子超材料
硅
制作
物理
反射器(摄影)
医学
光源
替代医学
病理
作者
Parikshit Moitra,Brian Slovick,Zhi Yu,Srini Krishnamurthy,Jason Valentine
摘要
All-dielectric metamaterials utilizing Mie resonances in high-permittivity dielectric resonators offer a low-loss alternative to plasmonic metamaterials. Here we present the demonstration of a single-negative all-dielectric metamaterial, comprised of a single layer of cylindrical silicon resonators on a silicon-on-insulator substrate, that possesses peak reflectance over 99% and an average reflectance over 98% across a 200 nm wide bandwidth in the short-wavelength infrared region. The study is also extended to disordered metamaterials, demonstrating a correlation between the degree of disorder and the reduction in reflectance. It is shown that near-unity reflection is preserved as long as resonator interaction is avoided. Realization of near-unity reflection from disordered metamaterials opens the door to large-area implementations using low-cost self-assembly based fabrication techniques.
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