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A titanium-based hollow-cube metamaterial for efficient broadband solar absorption.

Zhuocheng Xue¹, Shubo Cheng¹, Huafeng Zhang¹

¹School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China. shubocheng@yangtzeu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)

|March 31, 2026

Summary

This study introduces a novel broadband solar absorber using a metal-dielectric-metal structure. The design achieves high solar-weighted absorption efficiency, demonstrating potential for efficient solar energy harvesting.

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Broadband solar absorbers are crucial for efficient solar thermal conversion.
Existing designs face limitations in thermal stability and structural complexity.

Purpose of the Study:

To develop a novel refractory metal-based metamaterial absorber with enhanced broadband absorption.
To investigate its photothermal conversion efficiency and robustness.

Main Methods:

Finite difference time domain (FDTD) simulations were employed to analyze the metal-dielectric-metal structure.
Theoretical analysis explored the physical mechanisms of broadband absorption.

Main Results:

The proposed Ti/Al2O3/Ti structure achieved >90% absorption from 280-3138 nm.
A solar-weighted absorption efficiency of 92.8% was demonstrated.
The design showed robustness against polarization and incident angle variations.

Conclusions:

The novel absorber design offers superior thermal stability and structural simplicity compared to existing methods.
It is suitable for solar energy harvesting, thermal radiation control, and optoelectronic devices.
This work advances research in efficient solar energy utilization.