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Optomechanics in anisotropic liquid crystal -filled micro-bubble resonators
Optics Express
|June 30, 2019
Summary
Researchers developed tunable optomechanical devices using liquid crystal micro-bubble resonators. Acoustic properties of liquid crystals enable broad tuning of optomechanical resonances, enhanced by temperature and magnetic fields.
Area of Science:
- Optomechanics
- Materials Science
- Acousto-optics
Background:
- Whispering-gallery mode (WGM) resonators are sensitive to mechanical and optical properties.
- Liquid crystals (LCs) exhibit anisotropic acoustic and optical behaviors.
- Optomechanical systems couple light and mechanical motion within resonant cavities.
Purpose of the Study:
- To realize and investigate optomechanics in liquid crystal-filled micro-bubble resonators (LC-MBR).
- To explore the broad tuning capabilities of these LC-MBR systems.
- To leverage the unique properties of liquid crystals for enhanced optomechanical control.
Main Methods:
- Fabrication of micro-bubble resonators filled with liquid crystals.
- Characterization of optomechanical resonant modes (WGM) within the LC-MBR.
- Application of temperature and magnetic fields to tune the optomechanical resonances.
- Investigation of acoustic anisotropy and Fréedericksz transition effects.
Main Results:
- Demonstration of optomechanical effects in LC-MBR.
- Observation of enriched optomechanical resonant modes due to LC acoustic anisotropy.
- Significant enhancement of resonance tuning by exploiting the temperature-dependent sound speed of LCs.
- Broad tuning of optomechanical resonant frequency achieved by magnetic-field-induced LC re-orientation beyond the Fréedericksz transition.
Conclusions:
- Liquid crystal-filled micro-bubble resonators offer a versatile platform for tunable optomechanics.
- Acoustic anisotropy and tunable optical properties of LCs are key to achieving broad optomechanical tuning.
- The developed LC-MBR system enables the realization of optomechanical oscillators with wide tuning ranges.
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