Guided-mode resonant Brewster filter consisting of two homogenous layers and a single grating with an equal refractive index

In this paper, a new type of resonant Brewster filter (RBF) consisting of two homogenous layers and a single grating with an equal refractive index is presented. The properties are studied by using the plane waveguide method (PWM) and rigorous coupled-wave analysis (RCWA). It is found that the variation of the grating thickness does not effectively change the position of the resonant wavelength, however it has a remarkable effect on the line width, and the resonant peak can be adjusted back to its original position by slightly tuning the grating period. Moreover, by simultaneously tuning the thicknesses of the homogeneous layers above and beneath the grating structure, multiple channels can also be obtained when the RBF is illuminated at the Brewster angle calculated with the effective medium theory (EMT) of subwavelength grating. The adjacent optical thickness for acquiring the multiple channels is about three-quarters of the resonant wavelength. Furthermore, it is demonstrated that the line width at the operating resonant wavelength can be appreciably narrowed by tuning the thickness of the homogenous layer to its corresponding thickness without fine tuning the grating period or the thickness. Therefore, it is very useful for designing filters with different line widths at the desired wavelength. In addition, it is shown from our calculations that the symmetrical line feather can be obtained if the total optical thickness for the homogeneous layer meets the special condition.     

Guided-mode resonant Brewster filter consisting of two homogenous layers and a single grating with an equal refractive index

In this paper,a new type of resonant Brewster filter(RBF) consisting of two homogenous layers and a single grating with an equal refractive index is presented.The properties are studied by using the plane waveguide method(PWM) and rigorous coupled-wave analysis(RCWA).It is found that the variation of the grating thickness does not effectively change the position of the resonant wavelength,however it has a remarkable effect on the line width,and the resonant peak can be adjusted back to its original position by slightly tuning the grating period.Moreover,by simultaneously tuning the thicknesses of the homogeneous layers above and beneath the grating structure,multiple channels can also be obtained when the RBF is illuminated at the Brewster angle calculated with the effective medium theory(EMT) of subwavelength grating.The adjacent optical thickness for acquiring the multiple channels is about three-quarters of the resonant wavelength.Furthermore,it is demonstrated that the line width at the operating resonant wavelength can be appreciably narrowed by tuning the thickness of the homogenous layer to its corresponding thickness without fine tuning the grating period or the thickness.Therefore,it is very useful for designing filters with different line widths at the desired wavelength.In addition,it is shown from our calculations that the symmetrical line feather can be obtained if the total optical thickness for the homogeneous layer meets the special condition.     

高损伤阈值矩形石英闪耀光栅的设计分析

采用模态法分析了矩形亚波长石英闪耀光栅的设计原理,给出了1.06 μm工作波长的矩形亚波长石英闪耀光栅的设计示例。研究表明,要设计性能优良的-1级透射闪耀光栅,应使0/1阶传输模的累积相位差为π的奇数倍。设计的透射闪耀光栅能够使TM偏振光和TE偏振光获得近100%的-1级衍射效率,且具有较大的加工容差,较宽的入射波长和入射角变化适应范围。     

高损伤阈值矩形石英闪耀光栅的设计分析

 采用模态法分析了矩形亚波长石英闪耀光栅的设计原理,给出了1.06 μm工作波长的矩形亚波长石英闪耀光栅的设计示例。研究表明,要设计性能优良的-1级透射闪耀光栅,应使0/1阶传输模的累积相位差为π的奇数倍。设计的透射闪耀光栅能够使TM偏振光和TE偏振光获得近100%的-1级衍射效率,且具有较大的加工容差,较宽的入射波长和入射角变化适应范围。