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Related Experiment Video

Updated: Feb 4, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Compact folded metasurface spectrometer.

MohammadSadegh Faraji-Dana¹, Ehsan Arbabi¹, Amir Arbabi^1,2

¹T. J. Watson Laboratory of Applied Physics and Kavli Nanoscience Institute, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA, 91125, USA.

Nature Communications

|October 12, 2018

Summary

This summary is machine-generated.

Researchers developed compact folded metasurface optics for miniaturized spectrometers. This innovation uses reflective metasurfaces within a small glass slab, enabling high-resolution spectral analysis in a tiny volume.

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Area of Science:

Optics and Photonics
Nanotechnology
Spectroscopy

Background:

Metasurfaces offer advanced wavefront control at reflective interfaces.
Folded optics architectures confine light between reflective surfaces, enabling miniaturization.

Purpose of the Study:

To introduce and demonstrate folded metasurface optics.
To develop a highly compact spectrometer using this novel architecture.

Main Methods:

Fabrication of three reflective dielectric metasurfaces in a single lithographic step.
Integration of metasurfaces onto a 1-mm-thick glass substrate acting as the light propagation space.

Main Results:

Demonstration of a 7 mm³ spectrometer with ~1.2 nm resolution.
Successful resolution of over 80 spectral points within the 760–860 nm range.
Single-step fabrication of all metasurface components.

Conclusions:

Folded metasurface optics enable significant size reduction in optical systems.
This approach enhances mechanical robustness and integration potential.
The concept is applicable to diverse optical systems like imagers and signal processors.