An apodization method for guided-mode resonance grating with waveguide cavity

A cavity-resonator-integrated guided-mode resonance mirror (CRIGM) consisting of a small-aperture grating coupler integrated in a waveguide cavity on a high-reflection substrate reflects an incident free-space wave with reflection-phase variation of 2 π in a resonance condition. CRIGM has been inves...

Full description

Saved in:
Bibliographic Details
Published in:Japanese Journal of Applied Physics 2022-08, Vol.61 (SK), p.SK1008
Main Authors: Watanabe, Akari, Ozawa, Keisuke, Ueda, Ryohei, Inoue, Junichi, Kintaka, Kenji, Ura, Shogo
Format: Article
Language:English
Subjects:
Apodization
Cavity resonators
Electric fields
External mirrors
Gaussian beams (optics)
Grating apodization
Grating couplers
Guided-mode resonance
Matching
Numerical methods
Optical interconnects
Reflectance
Resonance
Substrates
Vertical-cavity surface-emitting laser
Wave reflection
Waveguide cavities
Waveguides
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A cavity-resonator-integrated guided-mode resonance mirror (CRIGM) consisting of a small-aperture grating coupler integrated in a waveguide cavity on a high-reflection substrate reflects an incident free-space wave with reflection-phase variation of 2 π in a resonance condition. CRIGM has been investigated as a key component in surface mount packaging of VCSEL for future optical interconnects but the reflectance of a fabricated CRIGM was not sufficient. Matching of electric field distribution between an incident Gaussian beam and the reflected beam from the CRIGM is discussed for improving the reflectance. A new apodization method of grating-tooth shift is proposed for the field-distribution matching. CRIGMs with the new and a well-known fill-factor apodization methods are characterized by numerical simulation. It is predicted that the previously measured reflectance will be improved by more than 1.2 dB by introducing either of the apodization methods.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ac629c