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Related Experiment Video

Updated: Mar 15, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Multiwavelength metasurfaces through spatial multiplexing.

Ehsan Arbabi¹, Amir Arbabi¹, Seyedeh Mahsa Kamali¹

¹T. J. Watson Laboratory of Applied Physics, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA.

Scientific Reports

|September 7, 2016

Summary

This summary is machine-generated.

Metasurfaces can now operate at multiple wavelengths using spatial multiplexing. This breakthrough enables multi-functional optical devices by focusing light at different wavelengths to the same focal point.

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Last Updated: Mar 15, 2026

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Area of Science:

Optics and Photonics
Materials Science

Background:

Metasurfaces offer advanced control over optical wavefronts.
Current metasurfaces typically function at a single wavelength, limiting their applications.

Purpose of the Study:

To demonstrate multiwavelength operation in metasurfaces.
To develop polarization-insensitive metasurface lenses capable of focusing light at multiple wavelengths.

Main Methods:

Utilized a high contrast dielectric transmittarray platform with amorphous silicon nano-posts.
Investigated spatial multiplexing schemes, including large-scale segmentation and meta-atom interleaving.
Designed metasurface lenses with a numerical aperture of 0.46.

Main Results:

Successfully focused light at 915 nm and 1550 nm to the same focal distance using a single metasurface device.
Demonstrated polarization-insensitive focusing capabilities.
Compared the performance of large-scale segmentation and meta-atom interleaving methods.

Conclusions:

Spatial multiplexing is an effective strategy for achieving multiwavelength metasurface devices.
The proposed method is generalizable for incorporating additional wavelengths and functionalities.
This approach offers a straightforward path toward multi-functional and multiwavelength metasurface applications.