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Related Experiment Video

Updated: Dec 27, 2025

Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared

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Published on: January 10, 2025

Black Metals: Optical Absorbers.

Stefan Lundgaard^1,2, Soon Hock Ng^1,2, Yoshiaki Nishijima^3,4

¹Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.

|March 4, 2020

Summary

We developed lithography-free thin-film structures with ultra-low broadband reflectance, achieving as low as 0.9%. This novel metamaterial design enables efficient anti-reflection surfaces for visible and infrared light.

Keywords:

Metamateraial optical absorber thin-film optics

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Traditional anti-reflection coatings often involve complex fabrication processes.
Achieving broadband, low-reflectivity surfaces across visible and infrared spectra remains a challenge.

Purpose of the Study:

To demonstrate a novel, lithography-free method for creating thin-film structures with significantly reduced reflectivity.
To achieve broadband absorption and tunable optical properties for anti-reflection applications.

Main Methods:

Fabrication of multi-layered (four layers) metal-SiO2 thin-film metamaterials.
Design utilizing optical impedance matching to minimize reflectance and transmittance.
Characterization of reflectance and transmittance across the 500-1400 nm spectral range.

Main Results:

Achieved ultra-low broadband reflectance, as low as 0.9% (4.9% overall, 8.9% for soda lime).
Demonstrated minimal reflectance and transmittance in the visible and infrared (IR) regions for various incident angles.
Confirmed enhanced absorbance and tunability of the thin-film structures.

Conclusions:

The lithography-free approach offers a simplified fabrication route for advanced optical surfaces.
The demonstrated metal-SiO2 metamaterial effectively functions as an anti-reflection surface through optical impedance matching.
This technology holds potential for developing novel anti-reflection and light-absorbing applications.