[Th-P] Nanophotonics

[Th-P-80] Dual-order Circular Grating Structure for Improving Absorption Efficiency in Ge-based Quantum Interfaces

〇Guangtai Lu¹, Sangmin Ji², Satoshi Iwamoto^1,3 (1. RCAST, The Univ. of Tokyo (Japan), 2. RISE, Hiroshima Univ. (Japan), 3. IIS, The Univ. of Tokyo (Japan))

To improve the absorption efficiency of Ge-based photon-to-spin quantum interfaces, we propose a dual-order circular grating consisting of an inner second-order grating and an outer first-order grating. Simulations show a 20% improvement in quantum-dot absorption compared with a conventional design.