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Updated: Oct 12, 2025
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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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Collimation and finite-size effects in suspended resonant guided-mode gratings
Summary
We studied optical transmission through silicon nitride gratings using a Gaussian beam. A coupled-mode model accurately predicted experimental results, aiding the design of photonic and sensing devices.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Suspended silicon nitride thin films with patterned gratings are crucial for photonics, sensing, and optomechanics.
- Understanding optical transmission through these structures is key for device optimization.
Purpose of the Study:
- To investigate the optical transmission of resonant guided-mode gratings on suspended silicon nitride films.
- To analyze the effects of Gaussian beam focusing and finite beam size on transmission spectra.
Main Methods:
- Experimental measurements of optical transmission spectra.
- Theoretical modeling using a phenomenological coupled-mode model.
- Comparison of experimental data with model predictions for various grating and beam parameters.
Main Results:
- The coupled-mode model accurately predicted experimental transmission spectra.
- The model allowed for detailed analysis of beam focusing and finite size effects.
- Good agreement was found across different grating structures and beam sizes.
Conclusions:
- The developed model is effective for analyzing optical transmission in these systems.
- Results provide insights for designing and optimizing suspended structured films for advanced applications.
- This work supports the advancement of photonics, sensing, and optomechanics technologies.
