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Multifunctional tunable visible light metalens based on double-layer barium titanate
Applied Optics
|October 18, 2022
Summary
This study introduces a tunable metalens using barium titanate nanorods. It offers dynamic control over optical functions like switching and focusing for advanced integrated optics applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Tunable metalenses are crucial for integrated optics and advanced imaging systems.
- Existing metalenses often lack multifunctionality and dynamic reconfigurability.
Purpose of the Study:
- To propose and demonstrate a multifunctional tunable metalens.
- To achieve dynamic control over optical functions using a barium titanate (BTO) structure.
Main Methods:
- Utilized a double-layer barium titanate (BTO) nanorod structure.
- Employed geometric phase principles for visible light manipulation.
- Applied external voltage (0-60 V) for independent tuning of refractive indices and waveplate properties.
Main Results:
- Demonstrated continuous and independent tuning of BTO nanorod refractive indices.
- Achieved switching between half-wave plate and full-wave plate functionalities.
- Enabled conversion between monofocal and bifocal metalenses with adjustable intensity.
- Showcased broadband focusing capabilities from 585-690 nm with good focusing effect.
Conclusions:
- The developed metalens offers dynamic reconfigurability and switching functions.
- This technology holds significant potential for multifunctional devices, biomedicine, optical communication, and imaging.
