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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Manipulating guided wave radiation with integrated geometric metasurface.

Bin Fang^1,2,3, Zhizhang Wang^1,2, Shenglun Gao^1,2

¹National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This study introduces a novel geometric metasurface interface for lithium niobate on insulator (LNOI) waveguides. This innovation enables advanced on-chip light manipulation for versatile integrated photonic devices.

Keywords:

guided wave metasurface optical field manipulation thin-film lithium niobate

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Area of Science:

Photonics and Nanotechnology
Integrated Optics
Metasurface Applications

Background:

Metasurfaces offer advanced light manipulation using subwavelength structures, enabling optical system miniaturization and multifunctionality.
Lithium niobate on insulator (LNOI) technology is advancing integrated photonics with multifunctional devices.
Current optical interfaces for LNOI lack sufficient versatility for complex light coupling and manipulation.

Purpose of the Study:

To develop a versatile geometric metasurface interface for LNOI waveguides.
To demonstrate on-chip integrated devices for free-space light field manipulation using this interface.
To overcome limitations of conventional gratings and enhance metasurface functionalities.

Main Methods:

Designing and fabricating a geometric metasurface interface tailored for LNOI waveguides.
Decorating LNOI waveguides with subwavelength optical antennas.
Manipulating guided waves to generate desired wavefronts for free-space applications.

Main Results:

Successful demonstration of on-chip integrated devices for free-space light field manipulation.
Achieved complex optical functions including focusing, multichannel vortex beam generation, and holography.
Developed an architecture that surpasses conventional gratings in functionality.

Conclusions:

The developed geometric metasurface interface significantly enhances the capabilities of LNOI waveguides.
This approach enables versatile guided-wave driven optical devices with complex free-space light manipulation.
The findings open new perspectives for future integrated photonic devices and applications.