Open AccessHigh-Q antisymmetric multimode nanobeam photonic crystal cavities in silicon waveguides
Author(s) -
Ping Yu,
Huiye Qiu,
Rui Cheng,
Lukas Chrostowski,
Jianyi Yang
Publication year - 2018
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.26.026196
Subject(s) - photonic crystal , antisymmetric relation , optics , multi mode optical fiber , guided mode resonance , materials science , resonance (particle physics) , reflection (computer programming) , optoelectronics , total internal reflection , silicon , q factor , waveguide , broadband , transverse mode , resonator , physics , optical fiber , diffraction , diffraction grating , laser , particle physics , computer science , mathematical physics , programming language
Antisymmetric multimode nanobeam photonic crystal cavities (AM-NPCs) are proposed and demonstrated in this paper. Due to transverse symmetry-breaking of the antisymmetric multimode periodic waveguide, anti-crossing of the fundamental mode and 1st-order mode is realized and confirmed by band structure calculation. Two-mode filtering and reflection-free cavity filters based on this characteristic are demonstrated. Experimental results on silicon-on-insulator platform shows that broadband (> 100 nm) reflection suppression (< -10 dB) and high-Q (7 × 10 4 ) AM-NPCs can be achieved using existed design methodology and fabrication facility. We also explain resonance splitting of the measured transmission spectra and find resonance-enhanced mode-conversion phenomena in the AM-NPCs.