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所属单位：理学院

发表刊物：OPTICAL ENGINEERING

关键字：all-dielectric metamaterial perfect reflector high-index dielectric Mie resonance

摘要：Compact nonabsorbing reflectors are useful in numerous important applications, such as surface protection against high-power irradiation, low-loss mirrors in laser cavities, and improvement of signal-to-noise ratios in bioimaging and nanosensing. We exploit the Mie resonance in periodically arranged silicon nanospheres to design a wide-angle broadband near-perfect all-dielectric metamaterial reflector. First, we obtain the reflectance of a semi-infinite dilute medium of dielectric spheres arranged in a simple-cubic lattice in air and deduce criteria such as the radius and period required to obtain a near-perfect mirror. Next, we construct a near-perfect broadband mirror using the metasurfaces in the near-infrared wavelength range for the period-to-radius ratio of similar to 2.54 for normal incidence. Finally, we study the reflection characteristics of the multilayer nanosphere metamaterials. A near-perfect mirror is designed, which is independent of polarization, and the permitted incident-angle width reaches 40 deg for three layers of metamaterial. This is the first study to address the optimal structure parameters for metasurfaces and the reflection characteristics of multilayer metamaterials. Our findings provide guidelines for the design of photonic devices based on dielectric metamaterials. (c) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)

ISSN号：0091-3286

是否译文：否

发表时间：2018-01-01

合写作者：Wang, Xuenan

通讯作者：马海霞