Observation of slow light in glide-symmetric photonic-crystal waveguides
Patil, Chirag Murendranath (Technical University of Denmark. Department of Photonics Engineering)
Arregui Bravo, Guillermo (Institut Català de Nanociència i Nanotecnologia)
Mechlenborg, Morten (Technical University of Denmark. Department of Photonics Engineering)
Zhou, Xiaoyan (Niels Bohr Institute)
Alaeian, Hadiseh (Purdue University. Department of Physics and Astronomy)
García Fernández, Pedro David (Institut Català de Nanociència i Nanotecnologia)
Stobbe, Søren (Technical University of Denmark. Department of Photonics Engineering)

Data:	2022
Resum:	We report optical transmission measurements on suspended silicon photonic-crystal waveguides, where one side of the photonic lattice is shifted by half a period along the waveguide axis. The combination of this glide symmetry and slow light leads to a strongly enhanced chiral light-matter interaction but the interplay between slow light and backscattering has not been investigated experimentally in such waveguides. We build photonic-crystal resonators consisting of glide-symmetric waveguides terminated by reflectors and use transmission measurements as well as evanescent coupling to map out the dispersion relation. We find excellent agreement with theory and measure group indices exceeding 90, implying significant potential for applications in slow-light devices and chiral quantum optics. By measuring resonators of different length, we assess the role of backscattering induced by fabrication imperfections and its intimate connection to the group index.
Nota:	Publicat sota la llicència específica de Optica Open Access Publishing Agreement: https://opg.optica.org/submit/review/pdf/CopyrightTransferOpenAccessAgreement-2021-09-20.pdf.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Dispersion relations ; Evanescent coupling ; Group index ; Light-matter interactions ; Optical transmission measurements ; Photonic crystal resonators ; Symmetric waveguides ; Symmetrics ; Transmission measurements ; Waveguide axis
Publicat a:	Optics express, Vol. 30, issue 8 (April 2022) , p. 12565-12575, ISSN 1094-4087

DOI: 10.1364/OE.449221

11 p, 3.0 MB

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