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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

High-Efficiency Bragg Mirrors by Solution-Based and Roll-to-Roll Processing.

Prateek¹, Tera Huang¹, Takumi Uchiyama¹

¹Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, United States.

|March 14, 2025

Summary

This summary is machine-generated.

This study presents scalable, solution-processed Bragg mirrors using titanium dioxide and silicon dioxide nanoparticles. These mirrors offer high thermal stability and reflectance, enabling efficient, flexible optical devices.

Keywords:

TiO2 nanoparticles coatings distributed Bragg reflectors (DBR)mesoporous networks multilayers optics photonic crystals polymer nanocomposites rapid thermal annealing (RTA)roll-to-roll processing sol−gel chemistry

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Developing solution-processed Bragg mirrors with high refractive index contrast (ΔRI) and thermal stability is challenging.
Existing methods often lack efficient processing and scalability.

Purpose of the Study:

To engineer high ΔRI titanium dioxide nanoparticle-based layers and low RI mesoporous silicon dioxide layers.
To achieve time-efficient processing and scalability for Bragg mirror fabrication.

Main Methods:

Utilized spin coating and roll-to-roll processing for stacking up to 11 layers.
Employed rapid thermal annealing (RTA) for enhanced thermal stability.
Fabricated large-scale mirrors on flexible substrates using commercial roll-to-roll tools.

Main Results:

Achieved high ΔRI of 0.67 at 519 nm and 0.92 at 380 nm.
Attained superior reflectance intensities of ~97% with RTA and ~80% without RTA on flexible substrates.
Demonstrated high thermal stability up to 450 °C.

Conclusions:

Successfully developed scalable, solution-processed Bragg mirrors with high performance.
The engineered nanoparticle-based layers offer a viable route for flexible, efficient optical devices.
Roll-to-roll processing enables high-throughput manufacturing of these advanced Bragg mirrors.