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Updated: Feb 11, 2026
07:51
Fabrication of Silica Ultra High Quality Factor Microresonators
Published on: July 2, 2012
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High-quality-factor multiple Fano resonances for refractive index sensing.
Optics Letters
|April 14, 2018
Summary
We developed a novel Fano resonance device with a high quality (Q)-factor and modulation depth for near-infrared applications. This device shows potential for advanced sensing, lasing, and nonlinear optics.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Materials Science
Background:
- Fano resonances offer sharp spectral features crucial for optical devices.
- Achieving high Q-factors and modulation depths simultaneously is challenging but desirable.
- Asymmetric nanostructures provide a pathway to engineer Fano resonances.
Purpose of the Study:
- To design and numerically analyze a high-Q, high-modulation-depth Fano resonance device.
- To investigate the tunability of Fano peaks using geometric parameters.
- To demonstrate the device's application in optical refractive index sensing.
Main Methods:
- Numerical analysis of a device with periodical asymmetric paired bars.
- Investigating Fano peak formation through interference of subradiant and magnetic dipole modes.
- Tailoring geometric parameters to control resonance characteristics.
Main Results:
- Achieved a maximal Q-factor exceeding 10^5.
- Reached modulation depths (ΔT) close to 100%.
- Demonstrated an optical refractive index sensor with 370 nm/RIU sensitivity and a figure of merit of 2846.
Conclusions:
- The designed device exhibits excellent performance metrics for Fano resonances.
- The device shows significant potential for applications in sensing, lasing, and nonlinear optics.
- Geometric parameter tuning offers precise control over device characteristics.
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