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Thermo‐optical Tunable Ultracompact Chip‐Integrated 1D Photonic Topological Insulator
Author(s) -
Li Chong,
Hu Xiaoyong,
Gao Wei,
Ao Yutian,
Chu Saisai,
Yang Hong,
Gong Qihuang
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201701071
Subject(s) - photonics , photonic crystal , materials science , photonic integrated circuit , topological insulator , optoelectronics , heterojunction , silicon photonics , topology (electrical circuits) , yablonovite , physics , condensed matter physics , electrical engineering , engineering
An on‐chip integrated one‐dimension topological insulator in the optical communication range is realized directly in an integrated photonic circuit. The system takes on a configuration of a 220 nm thick 1D photonic crystal heterostructure sandwiched between two gold films. A photonic topological edge state centered at 1550 nm is obtained for the chip‐integrated one‐dimension topological insulator made of a silicon/SiO 2 photonic crystal heterostructure with a feature size of only 2.25 µm integrated with a silicon waveguide. On/off switching of the photonic topological edge state was also achieved in a 1D topological insulator made of a VO 2 /SiO 2 photonic crystal heterostructure based on a thermally induced insulator‐to‐metal transition of VO 2 . This system not only paves the way for practical applications of photonic topological insulators in integrated photonic devices and chips but also provides a platform for fundamental studies of topological photonics.