Ultra-Compact Digital Metasurface Polarization Beam Splitter via Physics-Constrained Inverse Design
-
作者
Shi, Hao; Wang, Lin; Zhang, Lei; Wu, Yanqing; Li, Zhenjiang; Wang, Lu; Tai, Renzhong
-
刊物名称
APPLIED SCIENCES-BASEL
-
年、卷、文献号
2022, 12,
-
关键词
Shi, Hao; Wang, Lin; Zhang, Lei; Wu, Yanqing; Li, Zhenjiang; Wang, Lu; Tai, Renzhong
-
摘要
Inverse design effectively promotes the miniaturization of integrated photonic devices through the modulation of subwavelength structures. Utilizing a theoretical prior based inverse design, we propose an ultra-compact integrated polarizing beam splitter consisting of a standard silicon-on-insulator (SOI) substrate and a tunable air-silicon column two-dimensional code metasurface, with a footprint of 5 x 2.7 mu m(2). The effective refractive index of the waveguide is modulated by adjusting the two-dimensional code morphology in the additional layer to achieve efficient polarization beam splitting. The simulation results demonstrate high performance, with a low insertion loss (<0.87 dB) and high extinction ratio (>10.76 dB) in a bandwidth of 80 nm covering the C-band. The device can withstand manufacturing errors up to +/- 20 nm and is robust to process defects, such as the outer proximity effect, and thus is suitable for ultra-compact on-chip optical interconnects.
