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Published on: August 5, 2013
Fano resonances in prism-coupled multimode square micropillar resonators
Ho-Tong Lee1, Linjie Zhou, Andrew W Poon
1Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong Special Administrative Region, China.
Optics Letters
|July 13, 2005
Summary
We observed Fano resonances in a glass micropillar resonator using prism coupling. Asymmetric resonance line shapes in multimode spectra were modeled by light wave interference.
Area of Science:
- Optics and Photonics
- Resonator Physics
- Nanophotonics
Background:
- Micropillar resonators are key components in photonic integrated circuits.
- Understanding multimode interference is crucial for device performance.
- Fano resonances offer unique spectral features for sensing and filtering.
Purpose of the Study:
- To investigate Fano resonances in a multimode square glass micropillar resonator.
- To characterize the asymmetric line shapes of high-Q and low-Q resonances.
- To model the observed phenomena using light wave interference.
Main Methods:
- Utilizing angle-resolved prism coupling to excite resonances.
- Analyzing multimode reflection spectra to identify resonance characteristics.
- Developing a far-field interference model to explain observed line shapes.
Main Results:
- Successfully observed Fano resonances in the multimode resonator.
- Characterized distinctly asymmetric line shapes for both high-Q and detuned low-Q resonances.
- Demonstrated that these asymmetric line shapes evolve over a narrow angular range (~0.5 degrees).
Conclusions:
- The observed asymmetric multimode resonances can be attributed to the interference between evanescently and refractively coupled light waves.
- This study provides insights into controlling and understanding light interactions in multimode resonators.
- The findings have implications for designing advanced optical devices with tailored spectral responses.
