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Volume 15
Issue 5
10.3390/coatings15050605
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Communication

Fano Resonance in Ion-Bombarded Au-SiO2 Nanocomposites: Analysis of Mode Coupling and Optical Properties

by
Padmaja Guggilla
1,
Sharvare Palwai
1,2,
Angela Davis
1,
Jonathan Lassiter
1,
Satilmis Budak
3 and
Clyde Varner
1,*
1
Department of Physics, Chemistry, and Mathematics, College of Engineering, Technology and Physical Sciences, Alabama A&M University, Normal, AL 35811, USA
2
Department of Physics, College of Arts and Science, Tuskegee University, Tuskegee, AL 36088, USA
3
Department of Electrical Engineering and Computer Science, Alabama A&M University, Normal, AL 35811, USA
*
Author to whom correspondence should be addressed.
Coatings 2025, 15(5), 605; https://doi.org/10.3390/coatings15050605 (registering DOI)
Submission received: 10 February 2025 / Revised: 6 May 2025 / Accepted: 16 May 2025 / Published: 19 May 2025
Versions Notes

Abstract

This study investigates the optical properties of ion-bombarded Au-SiO2 nanocomposites, focusing on the enhanced Fano resonance observed in these samples. The formation of nanocrystals and nanocavities due to ion bombardment leads to significant interactions between plasmonic and vibrational modes, resulting in pronounced Fano resonance in the strong coupling regime. The study aims to explain the closer spacing of modes, the elevated baseline absorbance, and the asymmetric lineshape observed in the ion-bombarded samples. A detailed analysis is provided, comparing these findings with other sample preparations, such as Au-coated SiO2 and 20 nm Au colloidal on SiO2. The implications of these results for understanding plasmonic behavior and their potential applications in nanophotonics are discussed.
Keywords: plasmon; FTIR; nanoparticles plasmon; FTIR; nanoparticles

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MDPI and ACS Style

Guggilla, P.; Palwai, S.; Davis, A.; Lassiter, J.; Budak, S.; Varner, C. Fano Resonance in Ion-Bombarded Au-SiO2 Nanocomposites: Analysis of Mode Coupling and Optical Properties. Coatings 2025, 15, 605. https://doi.org/10.3390/coatings15050605

AMA Style

Guggilla P, Palwai S, Davis A, Lassiter J, Budak S, Varner C. Fano Resonance in Ion-Bombarded Au-SiO2 Nanocomposites: Analysis of Mode Coupling and Optical Properties. Coatings. 2025; 15(5):605. https://doi.org/10.3390/coatings15050605

Chicago/Turabian Style

Guggilla, Padmaja, Sharvare Palwai, Angela Davis, Jonathan Lassiter, Satilmis Budak, and Clyde Varner. 2025. "Fano Resonance in Ion-Bombarded Au-SiO2 Nanocomposites: Analysis of Mode Coupling and Optical Properties" Coatings 15, no. 5: 605. https://doi.org/10.3390/coatings15050605

APA Style

Guggilla, P., Palwai, S., Davis, A., Lassiter, J., Budak, S., & Varner, C. (2025). Fano Resonance in Ion-Bombarded Au-SiO2 Nanocomposites: Analysis of Mode Coupling and Optical Properties. Coatings, 15(5), 605. https://doi.org/10.3390/coatings15050605

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