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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Guided-mode resonance in curved grating structures.

Yasuo Ohtera¹, Shohei Iijima, Hirohito Yamada

¹Graduate School of Engineering, Tohoku University, Sendai 980-8579 Japan. ohtera@ecei.tohoku.ac.jp

|May 5, 2011

Summary

This summary is machine-generated.

Guided-mode resonance in curved gratings shows similar performance to flat gratings within a specific curvature range. This study clarifies key factors affecting reflection performance in these optical structures.

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Area of Science:

Optics and Photonics
Nanophotonics
Wave Phenomena

Background:

Guided-mode resonance (GMR) is a phenomenon utilized in various optical devices.
Curved grating structures offer potential advantages in optical system design.
Understanding GMR in non-planar geometries is crucial for advanced applications.

Purpose of the Study:

To investigate the guided-mode resonance phenomenon in curved grating structures.
To analyze the impact of curvature radius on resonance characteristics.
To identify critical factors influencing reflection performance.

Main Methods:

Utilized finite-difference time-domain (FDTD) simulation.
Employed a cylindrical coordinate system for accurate modeling.
Investigated the dependence of peak reflectivity and bandwidth on curvature radius.

Main Results:

Resonance characteristics (peak reflectivity and bandwidth) were found to be comparable to flat gratings within a finite curvature range.
The study identified specific curvature ranges where performance is maintained.
Key factors governing the reflection performance were elucidated.

Conclusions:

Curved grating structures can effectively support guided-mode resonance with performance similar to planar structures under certain conditions.
The curvature radius is a critical parameter influencing GMR performance.
This research provides insights for designing curved optical elements utilizing GMR.