Open AccessMid-IR Dirac-cone dispersion relation materialized in SOI photonic crystal slabs
Author(s) -
Yao Ya,
Naoki Ikeda,
Takashi Kuroda,
Takaaki Mano,
Hiromi Koyama,
Yoshimasa Sugimoto,
Kazuaki Sakoda
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.381996
Subject(s) - dispersion relation , optics , electron beam lithography , reflection (computer programming) , silicon on insulator , photonic crystal , dispersion (optics) , materials science , physics , optoelectronics , silicon , resist , nanotechnology , layer (electronics) , computer science , programming language
We materialized the isotropic Dirac-cone dispersion relation in the mid-infrared range by fabricating photonic crystal slabs of the C 4v symmetry in SOI (silicon-on-insulator) wafers by electron beam lithography. The dispersion relation was examined by the angle-resolved reflection spectra with our home-made high-resolution apparatus, which showed a good agreement with the dispersion relation and the reflection spectra calculated by the finite element method. The reflection spectra also agreed with the selection rules derived from the spatial symmetry of the Dirac-cone modes, which proved to be a powerful tool for the mode assignment.