2:00 PM - 2:15 PM [17p-F204-2] Optimization of Double Period Photonic Crystal Waveguide for Optical Radar for High-Quality Radiation Beam in Si Photonic LiDAR 〇Goro Takeuchi1, Moe Takeuchi1, Toshihiko Baba1 (1.Yokohama Nat'l Univ.)