Achieving High Quality Factor Interband Nanoplasmonics in the Deep Ultraviolet Spectrum via Mode Hybridization

Achieving High Quality Factor Interband Nanoplasmonics in the Deep Ultraviolet Spectrum via Mode Hybridization

Nano Letters

10.1021/acs.nanolett.4c06247

https://doi.org/10.1021/acs.nanolett.4c06247

Evelin Csányi, Yan Liu, Dan Kai, Sigit Sugiarto, Henry Yit Loong Lee, Febiana Tjiptoharsono, Qifeng Ruan, Soroosh Daqiqeh Rezaei, Xiao Chi, Andrivo Rusydi, Graham Leggett, Joel K. W. Yang, Zhaogang Dong

UV plasmonics, Interband plasmonics (IBP), c-Si nanodisk, c-Si nanohole, Localized surface plasmon resonance (LSPR), Optical mode hybridization

06 February 2025

Csányi, E., Liu, Y., Kai, D., Sugiarto, S., Yit Loong Lee, H., Tjiptoharsono, F., Ruan, Q., Daqiqeh Rezaei, S., Chi, X., Rusydi, A., Leggett, G., Yang, J. K. W., & Dong, Z. (2025). Achieving High Quality Factor Interband Nanoplasmonics in the Deep Ultraviolet Spectrum via Mode Hybridization. Nano Letters, 25(10), 3906–3913. https://doi.org/10.1021/acs.nanolett.4c06247

Interband plasmons (IBPs) enable plasmonic behavior in nonmetallic materials, such as semiconductors. Originating from interband electronic transitions, IBPs are characterized by negative real permittivity that can extend into deep ultraviolet (DUV) spectrum, as demonstrated using silicon. However, the practical applications of IBPs are limited by their inherently broad resonances. In this study, we address this limitation by hybridizing the localized plasmon resonance of silicon nanostructures with the Fabry–Pérot resonance of a SiO2 dielectric layer atop a silicon substrate. This design achieves a simulated quality factor (Q-factor) of ∼43, with experimental measurements yielding a Q-factor of 37 at ∼4.6 eV within the DUV region. Furthermore, we demonstrate a 5.4-fold enhancement in DUV absorption for lignin-modified polyethylene glycol films when integrated with the hybridized DUV cavity, showcasing the potential for UV blocking applications. Our findings offer a versatile platform that can be adapted to other IBP systems and open new opportunities in UV-specific applications.

Publisher Copyright

This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity (MTC) Individual Research Grant
Grant Reference no. : M21K2c0116

This research / project is supported by the Agency for Science, Technology and Research - Manufacturing, Trade, and Connectivity (MTC) Individual Research Grant
Grant Reference no. : M22K2c0088

This research / project is supported by the National Research Foundation, Singapore - Quantum Engineering Program 2.0
Grant Reference no. : NRF2021-QEP2-03-P09

This research is supported by core funding from: A*STAR DELTA-Q 2.0
Grant Reference no. : C230917005

This research / project is supported by the National Research Foundation, Singapore - Competitive Research Programme
Grant Reference no. : RF-CRP30-2023-0003, NRF-CRP20-2017-0001

This research / project is supported by the National Research Foundation, Singapore - National Research Foundation Investigatorship Award
Grant Reference no. : NRF-CRP20-2017-0001, NRF-NRFI06-2020-0005

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acs.nanolett.4c06247.

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