title: Angular-dependent polarization-insensitive filter fashioned with zero-contrast grating.
abstract: We report here an angular-dependent polarization-insensitive filter fashioned with a free-standing zero-contrast grating (ZCG), which is implemented on an HfO(2)/Silicon platform. The spectral characteristics are investigated by rigorous coupled-wave analysis method and measured on angular-resolved micro-reflectance system. The proposed ZCG structure experimentally shows that the polarization-insensitive resonances occur at 595nm for the incidence angle θ of 12.8° and 500nm for the incidence angle θ of 14.2°. When the incident light is normal to the grating surface, the ZCG device generates yellow and red colors for p- and s-polarization, respectively. The experimental results are in good agreement with the simulations, which indicate that the free-standing ZCG device is promising for polarization-insensitive filter and polarization-controlled tunable color filter.
authors.forename: Xumin
authors.initials: X
authors.lastname: Gao
authors.forename: Tong
authors.initials: T
authors.lastname: Wu
authors.forename: Yin
authors.initials: Y
authors.lastname: Xu
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Dan
authors.initials: D
authors.lastname: Bai
authors.forename: Gangyi
authors.initials: G
authors.lastname: Zhu
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhu
authors.forename: Yongjin
authors.initials: Y
authors.lastname: Wang