Si-microring resonator with sidewall nanograting structures for high-Q resonance modes

A nanograting microring resonator is proposed for achieving concentric mode field profiles as the effect of guided-mode resonance. Based on a numerical simulation of the 2D finite-difference time-domain method, we clarified that the microring resonator with a combination of nanograting microring and...

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Published in:Optical review (Tokyo, Japan) Japan), 2023-04, Vol.30 (2), p.238-245
Main Authors: Igarashi, Anh, Murooka, Koya, Ohtera, Yasuo, Yamada, Hirohito
Format: Article
Language:English
Subjects:
Atomic
Japan
Lasers
Microwaves
Molecular
Optical and Plasma Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum Optics
RF and Optical Engineering
Sapporo
Special Section: Regular Paper
The 13th International Conference on Optics-Photonics Design & Fabrication (ODF’22)
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container_title Optical review (Tokyo, Japan)
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creator Igarashi, Anh
Murooka, Koya
Ohtera, Yasuo
Yamada, Hirohito
description A nanograting microring resonator is proposed for achieving concentric mode field profiles as the effect of guided-mode resonance. Based on a numerical simulation of the 2D finite-difference time-domain method, we clarified that the microring resonator with a combination of nanograting microring and sidewall blocks could generate two operating modes. The first is the optical whispering gallery mode, by which the light was in resonance inside the microring by total internal reflection and traveled in a circle around the microring. The second mode is guided-mode resonance, by which the light scattering from the grating structures is in resonance to create concentric magnetic-field distributions. The characteristics of resonance modes of the mode numbers, mode distribution, and Q factors are analyzed at the changes of the microring radius and the nanograting structures. A design of a nanograting bus waveguide with the same grating period as the nanograting microring is verified to achieve a high efficiency of the coupling ratio.
doi_str_mv 10.1007/s10043-023-00793-0
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subjects Atomic
Japan
Lasers
Microwaves
Molecular
Optical and Plasma Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum Optics
RF and Optical Engineering
Sapporo
Special Section: Regular Paper
The 13th International Conference on Optics-Photonics Design & Fabrication (ODF’22)
title Si-microring resonator with sidewall nanograting structures for high-Q resonance modes
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