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High numerical aperture multifocal metalens based on Pancharatnam-Berry phase optical elements
Applied Optics
|November 22, 2018
Summary
This study introduces a high numerical aperture multifocal metalens using Pancharatnam-Berry phase elements for precise light focusing. The metalens demonstrates potential for advanced particle manipulation and high-resolution imaging applications.
Area of Science:
- Optics and Photonics
- Metamaterials
- Nanotechnology
Background:
- Metalenses offer miniaturized optical components.
- Pancharatnam-Berry phase elements enable advanced optical control.
Purpose of the Study:
- To propose and demonstrate a high numerical aperture multifocal metalens.
- To achieve diffraction-limited focusing for various polarizations.
- To explore spin-independent focusing capabilities.
Main Methods:
- Design of Pancharatnam-Berry phase optical elements.
- Fabrication and characterization of multifocal metalenses.
- Analysis of focusing performance with different incident polarizations.
Main Results:
- Achieved a highest numerical aperture of 0.84 with a full width at half-maximum of 263 nm.
- Demonstrated simultaneous focusing of right and left circularly polarized light.
- Presented a hybrid metalens with spin-independent focusing (NA=0.8).
Conclusions:
- The proposed metalens enables precise light manipulation.
- High numerical aperture and spin-dependent/independent focusing are achievable.
- Potential applications in particle manipulation and high-resolution imaging.
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