AI Article Synopsis
- Structures that absorb light perfectly can lead to advances in fields like sensing and photocatalysis, but research on how particle size affects this ability is limited.
- Researchers created nearly perfect light absorbers using gold nanoparticles arranged on a titanium oxide film backed by a gold mirror, allowing for precise control of spacing between particles.
- By varying the size of the nanoparticles, they observed notable changes in the way light interacts with the structure, using coupled-mode theory to explain these changes and guide the design of more effective absorbers.
Article Abstract
Structures capable of perfect light absorption promise technological advancements in varied applications, including sensing, optoelectronics, and photocatalysis. While it is possible to realize such structures by placing a monolayer of metal nanostructures above a reflecting surface, there remains limited studies on what effect particle size plays on their capacity to absorb light. Here, we fabricate near-perfect absorbers using colloidal Au nanoparticles, via their electrostatic self-assembly on a TiO film supported by a gold mirror. This method enables the control of interparticle spacing, thus minimizing reflection to achieve optimal absorption. Slightly altering the nanoparticle size in these structures reveals significant changes in the spectral separation of hybrid optical modes. We rationalize this observation by interpreting data with a coupled-mode theory that provides a thorough basis for creating functional absorbers using complex colloids and outlines the key considerations for achieving a broadened spectral response.
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| http://dx.doi.org/10.1021/acs.jpclett.0c02461 | DOI Listing |
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