中国物理B ›› 2016, Vol. 25 ›› Issue (11): 114213-114213.doi: 10.1088/1674-1056/25/11/114213
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Wenjing Fang(房文敬), Yongqing Huang(黄永清), Xiaofeng Duan(段晓峰), Kai Liu(刘凯), Jiarui Fei(费嘉瑞), Xiaomin Ren(任晓敏)
Wenjing Fang(房文敬)1,2, Yongqing Huang(黄永清)1,2, Xiaofeng Duan(段晓峰)1,2, Kai Liu(刘凯)1,2, Jiarui Fei(费嘉瑞)1,2, Xiaomin Ren(任晓敏)1,2
摘要: A high-contrast grating (HCG) focusing reflector providing phase front control of reflected light and high reflectivity is proposed and fabricated. Basic design rules to engineer this category of structures are given in detail. A 1550 nm TM polarized incident light of 11.86 mm in focal length and 0.8320 in reflectivity is obtained in experiment. The wavelength dependence of the fabricated HCGs from 1530 nm to 1580 nm is also tested. The test results show that the focal length is in the range of 11.81-12 mm, which is close to the designed focal length of 15 mm. The reflectivity is almost above 0.56 within a bandwidth of 50 nm. At a distance of 11.86 mm, the light is focused to a round spot with the highest concentration, which is much smaller than the size of the incident beam. The FWHM of the reflected light beam decreases to 120 nm, and the intensity increases to 1.18.
中图分类号: (Gratings)