Zou Xiujuan, Zheng Gaige, Cong Jiawei, Xu Linhua, Chen Yunyun, Lai Min
Opt Lett. 2018 Jan 1;43(1):46-49. doi: 10.1364/OL.43.000046.
A polarization-insensitive and angle-independent graphene absorber (GA) with periodically patterned grating is demonstrated. A periodic nanocavity composed of multilayer subwavelength grating and metal substrate supports a strongly localized mode inside the cavity, where the mode helps to absorb more electromagnetic waves. The proposed GA exhibits polarization-insensitive behavior and maintains the high absorption above 90% within a wide range of incident angle (more than 80°). We attribute the high absorption to the excitation of the cavity mode resonance and magnetic resonance for the transverse electric and transverse magnetic polarizations, respectively. The proposed GA has potential applications in the design of various devices, such as optical modulators or tunable absorption filters because of its remarkable angle-insensitive absorption performance.
展示了一种具有周期性图案化光栅的偏振不敏感且与角度无关的石墨烯吸收器（GA）。由多层亚波长光栅和金属基板组成的周期性纳米腔在腔内支持一种强局域模式，该模式有助于吸收更多的电磁波。所提出的GA表现出偏振不敏感行为，并在很宽的入射角范围内（超过80°）保持高于90%的高吸收率。我们将高吸收率分别归因于横向电场和横向磁场偏振下腔模共振和磁共振的激发。由于其显著的角度不敏感吸收性能，所提出的GA在各种器件的设计中具有潜在应用，如光调制器或可调吸收滤波器。
