title: Design of ultrabroadband internal reflection gratings with high efficiency.
abstract: A high-efficiency, ultrabroadband dielectric internal reflection grating with rhombus-shaped grooves is designed by a rigorous coupled-wave analysis, and an effective method for predicting spectral bandwidths of gratings from their efficiency maps is presented. The grating can be fabricated from a single dielectric material, and its reflection diffraction efficiency of the -1st order can reach more than 0.99. More importantly, an ultrabroadband top-hat diffraction spectrum with efficiency exceeding 0.98 over 170 nm wavelength wide is achieved, which makes the gratings suitable for applications associated with broadband illumination, such as ultrashort pulses.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China. luoxuele@gmail.com
authors.forename: Qunyu
authors.initials: Q
authors.lastname: Bi
authors.forename: Jiangjun
authors.initials: J
authors.lastname: Zheng
authors.forename: Meizhi
authors.initials: M
authors.lastname: Sun
authors.forename: Xinbo
authors.initials: X
authors.lastname: Yang
authors.forename: Xinglong
authors.initials: X
authors.lastname: Xie
authors.forename: Zunqi
authors.initials: Z
authors.lastname: Lin