基于古斯-汉欣位移的双通道窄带滤波器

Double-channel narrowband filter based on Goos-Hnchen shift

本文利用光束在对称金属包覆波导表面反射得到的异常大的古斯-汉欣(Goos-Hnchen)位移,通过实验实现了双通道窄带滤波.当入射激光波长为859.60nm时,两通道滤波的峰值位置分别为859.604nm和859.688nm,峰值半宽(FWHM)为0.036nm,而消光比达到15.3dB.峰值波长可通过改变入射角或小孔位置实现调谐.

We propose a double-channel narrowband filter based on anomalous large Goos-Hanchen shift reflected from a symmetrical metal-cladding optical waveguide. We demonstrate that two filtering peaks are 859. 604nm and 859. 688nm respectively. The 3 dB bandwidth is found to be 0. 036 nm with an extinction ratio of 15.3dB at a light wavelength of 859.60nm. The filtering peaks can be tuned by choosing an appropriate incident angle and a aperture position.