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A Metallic Glass-Based Dual-Band-Selective Emitter with Near-Perfect Absorption in Atmospheric Windows.

Tzu-Chieh Hsiao¹, Wei-Han Wang¹, Yu-Ching Shih¹

¹Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.

ACS Applied Materials & Interfaces

|May 21, 2025

Summary

A novel trilayered metallic glass-insulator-metal structure achieves near-perfect dual-band infrared absorption. This design offers enhanced radiative cooling and simplified fabrication for infrared applications.

Keywords:

asymmetric cavity structure atmospheric window dual-band-selective emitter metallic glass omnidirectional emission perfect absorber radiative cooling

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Conventional metal-insulator-metal (MIM) structures struggle with infrared absorption due to metal reflectivity.
Achieving dual-band selective absorption in mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) bands is challenging.

Purpose of the Study:

To propose and demonstrate a new trilayered metallic glass-insulator-metal (MGIM) structure for near-perfect dual-band selective absorption.
To investigate the performance of MGIM structures for infrared applications, including radiative cooling.

Main Methods:

Fabrication of an asymmetric metallic glass-insulator-metal (MGIM) structure using metallic glass film as the top layer.
Characterization of the absorptance spectra and omnidirectional properties of the fabricated MGIM structure.

Main Results:

The MGIM structure achieved near-unity absorptions within MWIR and LWIR atmospheric windows (96.7% at 3.9 μm and 98.8% at 10.8 μm).
The structure demonstrated outstanding omnidirectional properties and superior radiative cooling performance compared to conventional MIM emitters.
A lithography-free process simplified fabrication and reduced costs compared to complex metamaterial structures.

Conclusions:

The AlNiY-based MGIM structure is highly promising for heat dissipation and infrared applications.
The proposed design overcomes limitations of traditional MIM structures in the infrared spectrum.
The simplified, cost-effective fabrication process makes this technology scalable.