亚波长光栅的可见光共振特性研究

研究亚波长光栅的可见光共振特性. 分析了光栅共振的基本原理. 基于严格矢量衍射理论给出了不同光栅参量(如光栅周期、填充因数、光栅深度、光栅材料等)的优化设计图,定量得出了各参量控制光栅共振特性(共振波长和半峰全宽)的一般规律,共振波长与光栅周期成比例. 共振半峰全宽值主要依赖于光栅调制系数和波导光栅对导模的限制程度,填充因数和光栅深度也对其有一定的影响,为新型防伪光栅设备的开发提供了理论依据.

A Study on the Resonance Characteristics of Sub-Wavelength Gratings in the Visible Region

Resonance characteristics of sub-wavelength gratings in the visible region are studied.The basic physical principle of resonant gratings is analyzed.Based on the rigorous vector diffractive theory,various optimization design plots about different grating parameters such as the grating period,filling factor,grating depth,grating materials et al,are provided.Detailed and accurate quantitative information on how various grating parameters affect the optical characteristics of the resonance device are given.The resonant wavelength is primarily determined by and directly proportional to the grating period.The full-width-half-maximum(FWHM) of resonance is mainly controlled by the grating modulation amplitude and the confinement of modes in the associated waveguide grating structure.The grating depth and filling factor have certain effects on the FWHM.These provide theoretical direction for the design of new optical anti-counterfeit devices.