Presentation Information
[9a-PA4-27]Design of Mode Converter Metasurface Based on the Direct Backpropagation method
〇Atsushi Kibune1, Masaki Okamoto1, Tianji Zhang1, Yasufumi Yamada2, Takeshi Sugiura3, Shiei Kusajima3, Toru Asahi1,2,4, Kenta Nakagawa2 (1.Waseda Univ., 2.Comp. Res. Org., Waseda Univ., 3.OPTORUN Co., Ltd., 4.Nano & Life, Waseda Univ.)
Keywords:
Metasurface,Mode Conversion,Angular Spectrum Method (ASM)
As a mode conversion device for few-mode fiber communication, a metasurface-based mode converter was designed. Using a unit-cell library constructed by the Rigorous Coupled-Wave Analysis (RCWA) method, the required phase distribution on the metasurface was calculated through back-propagation based on the Angular Spectrum Method (ASM), targeting the LP11 mode. The arrangement of nanopillars was then determined accordingly. Forward simulations demonstrated a two-lobed electric-field distribution corresponding to the LP11 mode.