Spectral resonant properties of reflected light for metal dielectric subwavelength gratings in visible regions
Spectral resonant properties of reflected light for metal dielectric subwavelength gratings in visible regions
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金属介质亚波长光栅可见光区反射光的光谱谐振特性
DOI：
10.1364/jot.79.000758
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发表时间：
2012-12-01
影响因子：
0.4
通讯作者：
Cai, Shengyan
中科院分区：
文献类型：
--
作者：
Chen, Yongli;Liu, Wenxia;Cai, Shengyan
金属-介质光栅由周期小于可见光辐射的单个波长的金属和介质材料交替组成。系统地研究了该光栅对s偏振和p偏振白色入射光的反射光谱的光学行为。对于反射光，是p偏振光而不是s偏振光表现出不寻常的光学行为，具有单峰光谱的特征，高于75%的较高的峰值效率和较低的非共振效率。具有理想频率选择功能的p偏振光的光谱宽度要宽得多。随着填充因子的增加，p偏振存在两个相互靠近的共振区，共振区的位置主要由光栅周期决定，它们之间存在线性关系。为了使共振位置发生在可见光波长，填充因子和光栅周期应分别设计在0.5 - 0.6和0.25 - 0.45 μm之间。新观察到的p偏振光的特性可以用于开发光学证券和滤色器领域中用于反射应用的新型器件。
A metal-dielectric grating consists of alternating metal and dielectric materials with period less than single wavelength of visible radiations. Optical behaviors of reflection spectra of this grating for s-polarized and p-polarized incident white light are studied systematically. For reflected light, it is the p-polarized light rather than s-polarization shows unusual optical behaviors with characteristics of single-peak spectra, higher peak efficiencies of higher than 75% and lower off-resonant efficiencies. The spectral width of p-polarized light with desirable frequency-selective functions is much wider. There exist two resonant areas for p-polarizations extending toward each other as filling factors increase, and positions of the resonances are mainly determined by grating periods existing linear relationships between them. For making positions of resonances occur in visible wavelengths, filling factors and grating periods should be respectively designed between 0.5 and 0.6 and between 0.25 and 0.45 µm. The newly observed properties of p-polarized lights can be used to exploit novel devices for reflection applications in the fields of optical securities and color filters.