[11a-B11-1~11] 3.10 Photonic structures and phenomena

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[11a-B11-5] Formation of periodic refractive-index structures by laser-induced phase transition in Sb₂Se₃ thin films

〇Keiju Iwatani^1,2, Takahiro Uemura², Taiki Yoda¹, Yuto Moritake⁴, Hisashi Sumikura^2,3, Masaya Notomi^1,2,3 (1.Science Tokyo, 2.NTT BRL, 3.NTT NPC, 4.The Univ. of Tokyo)

Keywords:

Phase Change Material,Photonic Crystal,Reconfigurable Nanophotonics

Laser-induced phase transitions were locally introduced into Sb₂Se₃ phase-change thin films to fabricate one-dimensional gratings and two-dimensional square-lattice photonic crystal structures without lithography. Band dispersion was observed through diffraction measurements and photonic band spectroscopy. This method enables periodic refractive-index distributions to be directly written at arbitrary locations after film deposition and is expected to facilitate the local formation and modification of photonic structures.