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Arbitrary function resonance tuner of the optical microcavity with sub-MHz resolution
Optics Letters
|July 2, 2019
Summary
Researchers developed a novel optical microcavity tuner. This device precisely adjusts resonance frequency using mechanical compression, enabling advanced applications in optical systems.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Whispering gallery mode (WGM) microcavities are crucial optical components.
- Precise control over their resonance frequency is vital for diverse applications.
Purpose of the Study:
- To design and implement a functional resonance tuner for optical microcavities.
- To achieve high-resolution frequency tuning and arbitrary periodic modulation.
Main Methods:
- Utilizing a piezoelectric nano-positioner to apply axial mechanical compression to a microsphere.
- Implementing periodic tuning functions, including sine and sigmoid, with high fidelity.
Main Results:
- Achieved a resonance frequency tuning resolution of approximately 650 kHz (7 pm at 1450 nm).
- Demonstrated accurate periodic tuning with over 99% fitting accuracy for arbitrary functions.
Conclusions:
- The developed tuner significantly enhances the applicability of ultrahigh Q-factor microresonators.
- Enables new possibilities in multi-mode coupling and time-Floquet systems.
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