[24a-11E-1~9] 3.10 Photonic structures and phenomena (formerly 3.11)

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)

[24a-11E-3] Topological optimization of Si SLG structure with high group index

〇Masataka Ando¹, Keisuke Hirotani¹, Toshihiko Baba¹ (1.Yokohama Nat'l Univ.)

Keywords:

Si Photonics,Slow Light Grating,Photonic Crystal Waveguide

An optically integrated FMCW LiDAR combining a photonic crystal waveguide (PCW) and a slow light grating (SLG) has been developed. Since the previous SLG achieved a maximum upward emissivity of 95%, but after optimization, the group index decreased and the beam scanning efficiency deteriorated, we have designed a new SLG based on a PCW with a high group refractive index. Topological optimization was introduced to achieve an upward emissivity of up to 80.7%, and the emissivity coefficient and beam half-width were also improved.