Conference paper
Optical bound state in the continuum in the one-dimensional photonic structures: Transition into a resonant state
Optical bound states in the continuum (BIC) are localized states with energy lying above the light line and having infinite lifetime. Any losses taking place in real systems result in transformation of the bound states into resonant states with finite lifetime. In this work, we analyze properties of BIC in CMOS-compatible one-dimensional photonic structure based on silicon-on-insulator wafer at telecommunication wavelengths, where the absorption of silicon is negligible.
We reveal that a high-index substrate could destroy both off-Γ BIC and in-plane symmetry protected at-Γ BIC turning them into resonant states due to leakage into the diffraction channels opening in the substrate. We show how two concurrent loss mechanisms — scattering due to surface roughness and leakage into substrate — contribute to the suppression of the resonance lifetime and specify the condition when one of the mechanisms becomes dominant.
The obtained results provide useful guidelines for practical implementations of structures supporting optical bound states in the continuum.
Language: | English |
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Publisher: | IEEE |
Year: | 2017 |
Pages: | 2817-24 |
Proceedings: | 38<sup>th</sup> Progress in Electromagnetic Research Symposium 2017 |
Series: | Progress in Electromagnetics Research Symposium |
ISBN: | 1509062696 , 150906270X , 150906270x , 9781509062690 and 9781509062706 |
ISSN: | 15599450 |
Types: | Conference paper |
DOI: | 10.1109/PIERS.2017.8262233 |
ORCIDs: | Takayama, Osamu , Malureanu, Radu and Lavrinenko, A. V. |
CMOS-compatible one-dimensional photonic structure Optical losses Optical scattering Photonics Q-factor Si Silicon Silicon compounds Substrates at-Γ BIC bound states continuum diffraction channels finite lifetime high-index substrate in-plane symmetry light diffraction light line light scattering localized states loss mechanisms off-Γ BIC optical bound state optical losses photonic crystals resonance lifetime resonant state resonant states scattering silicon-on-insulator silicon-on-insulator wafer surface roughness telecommunication wavelengths