Affiliation:
1. University of Copenhagen
2. Technical University of Denmark
3. Catalan Institute of Nanoscience and Nanotechnology (ICN2)
4. Purdue University
Abstract
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.
Funder
Det Frie Forskningsråd
Innovationsfonden
Villum Fonden
Danmarks Grundforskningsfond
Subject
Atomic and Molecular Physics, and Optics
Cited by
6 articles.
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