Abstract
A thin-film grating on a curved substrate functions as a highly reflective and wavelength sensitive mirror for a diverging wave that has the same curvature as the substrate. In this paper we propose a cylindrical cavity surrounded by a curved resonant grating wall, and describe its resonance characteristics. Through finite-difference time-domain (FDTD) simulation we have clarified that this type of cavity supports two resonance modes: one is confined by Fresnel reflection and the other by resonance reflection of the wall. We have also demonstrated that the latter mode exhibits a Q factor several orders of magnitude higher than that of the former mode.
| Original language | English |
|---|---|
| Pages (from-to) | 101-113 |
| Number of pages | 13 |
| Journal | Micromachines |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2012 |
Keywords
- Circular cavity
- Cylindrical cavity
- Guided-mode resonance
- Resonant grating