講演情報
[19p-A602-11]Nanocavity induced by atomically thin transition metal dichalcogenide in photonic crystal waveguide
〇(PC)CheeFai Fong1, Daiki Yamashita2,3, Nan Fang1, Shun Fujii2,4, Yih-Ren Chang1, Takashi Taniguchi5, Kenji Watanabe6, Yuichiro K. Kato1,2 (1.CPR, RIKEN, 2.RAP, RIKEN, 3.AIST, 4.Keio University, 5.MANA, NIMS, 6.NIMS)
キーワード：
semiconductor、2D materials、photonic crystal
Photonic crystal (PhC) cavities can be formed by depositing materials onto PhC waveguides post-fabrication to modulate the local refractive index. Previous studies suggested that ultrahigh Q-factor PhC cavities could be formed with a small local refractive index modulation of ~0.1%. However, experimental attempts to create such cavities by depositing poly(methyl methacrylate) (PMMA) onto GaAs PhC waveguides were unable to achieve ultrahigh Q cavities because of the thick polymer layer. Another approach of placing nanowires along the PhC waveguide to induce the formation of nanocavities have also been reported. Alternatively, 2D materials with their atomically thin nature represent a novel platform to realize the small refractive index modulation to induce high Q nanocavity in a PhC waveguide. In this work, we report the observation of high Q-factor nanocavities formed by placing atomically thin transition metal dichalcogenide flakes onto PhC waveguides.