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$Interference and Diffraction$ 02:18

Interference and Diffraction

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Related Experiment Video

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Broadband perfect Littrow diffraction metasurface under large-angle incidence.

Jingyuan Zhu^1,2,3,4,5, Siliang Zhou^1,2,3,4,5, Tao He^1,2,3,4,5

¹Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.

Nanophotonics (Berlin, Germany)

|April 28, 2025

Summary

Researchers developed a novel supercell metasurface for large-angle broadband Littrow diffraction. This metasurface achieves 99% efficiency in the mid-infrared spectrum, overcoming limitations of traditional devices for laser applications.

Keywords:

Littrow-mounting broadband diffraction large-angle non-local metasurface

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Area of Science:

Optics and Photonics
Metamaterials
Diffractive Optics

Background:

Littrow diffraction devices are crucial in laser systems but face challenges with large incidence angles and broadband efficiency.
Traditional diffraction devices struggle to maintain performance under large-angle incidence.
Metasurfaces offer potential for enhanced broadband efficiency, but broadband Littrow configurations have been limited.

Purpose of the Study:

To propose and demonstrate a supercell metasurface for broadband Littrow diffraction at large incidence angles.
To overcome energy flow mismatch and bandwidth limitations in existing metasurface diffraction devices.
To achieve high efficiency for Littrow diffraction devices in the mid-infrared spectrum.

Main Methods:

Design of a supercell metasurface to regulate broadband non-local responses.
Engineering structural coupling effects to manage non-local responses under varying incidence angles.
Experimental realization and characterization of the metasurface in the mid-infrared spectrum.

Main Results:

A large-angle broadband Littrow diffraction metasurface was successfully realized.
The metasurface demonstrated 99% efficiency at a 70° Littrow angle in the 3.11 µm – 3.52 µm range.
Non-local responses were suppressed under Littrow mounting and enhanced when deviating from it.

Conclusions:

The developed supercell metasurface overcomes bandwidth limitations for perfect diffraction.
This breakthrough provides significant support for practical applications of metasurfaces in Littrow diffraction devices.
The device offers enhanced performance for laser resonators and spectrometers requiring large incidence angles.