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Interference micro/nanolenses of salts for local modulation of Raman scattering

Micro/nanolenses play a crucial role in optics and spectroscopy, but the effect of interference patterns within each lens has been largely unexplored. Herein, we investigate modulation of Raman scattering by the interference within a single micro/nanolens of a hygroscopic salt. Lenses having two dif...

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Autores principales: Kim, Yun-Tae, Lee, Cheongha, Lim, Seongyeop, Lee, Chang Young
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10624006/
https://www.ncbi.nlm.nih.gov/pubmed/37928860
http://dx.doi.org/10.1039/d3ra05722d
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author Kim, Yun-Tae
Lee, Cheongha
Lim, Seongyeop
Lee, Chang Young
author_facet Kim, Yun-Tae
Lee, Cheongha
Lim, Seongyeop
Lee, Chang Young
author_sort Kim, Yun-Tae
collection PubMed
description Micro/nanolenses play a crucial role in optics and spectroscopy, but the effect of interference patterns within each lens has been largely unexplored. Herein, we investigate modulation of Raman scattering by the interference within a single micro/nanolens of a hygroscopic salt. Lenses having two different diameter (d) ranges, d > 2 μm and d ∼1 μm, are placed on a silicon substrate, followed by collection of a Raman intensity map of the silicon peak. Lenses with d > 2 μm show dark and bright circular fringes in the Raman map, resembling the Newton's rings formed by optical interference. In the smaller lenses (d ∼1 μm), the map yields only a single peak at the center, representing either an intensity maximum or minimum. In both diameter ranges, whether the Raman intensity is enhanced or suppressed is determined by interference conditions, such as wavelength of the excitation laser or thickness of the SiO(2) layer. The interference in salt micro/nanolenses finds applications in local modulation of Raman scattering of a nanoscale object, as demonstrated in individual single-walled carbon nanotubes decorated with the salt lenses.
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spelling pubmed-106240062023-11-04 Interference micro/nanolenses of salts for local modulation of Raman scattering Kim, Yun-Tae Lee, Cheongha Lim, Seongyeop Lee, Chang Young RSC Adv Chemistry Micro/nanolenses play a crucial role in optics and spectroscopy, but the effect of interference patterns within each lens has been largely unexplored. Herein, we investigate modulation of Raman scattering by the interference within a single micro/nanolens of a hygroscopic salt. Lenses having two different diameter (d) ranges, d > 2 μm and d ∼1 μm, are placed on a silicon substrate, followed by collection of a Raman intensity map of the silicon peak. Lenses with d > 2 μm show dark and bright circular fringes in the Raman map, resembling the Newton's rings formed by optical interference. In the smaller lenses (d ∼1 μm), the map yields only a single peak at the center, representing either an intensity maximum or minimum. In both diameter ranges, whether the Raman intensity is enhanced or suppressed is determined by interference conditions, such as wavelength of the excitation laser or thickness of the SiO(2) layer. The interference in salt micro/nanolenses finds applications in local modulation of Raman scattering of a nanoscale object, as demonstrated in individual single-walled carbon nanotubes decorated with the salt lenses. The Royal Society of Chemistry 2023-11-03 /pmc/articles/PMC10624006/ /pubmed/37928860 http://dx.doi.org/10.1039/d3ra05722d Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Kim, Yun-Tae
Lee, Cheongha
Lim, Seongyeop
Lee, Chang Young
Interference micro/nanolenses of salts for local modulation of Raman scattering
title Interference micro/nanolenses of salts for local modulation of Raman scattering
title_full Interference micro/nanolenses of salts for local modulation of Raman scattering
title_fullStr Interference micro/nanolenses of salts for local modulation of Raman scattering
title_full_unstemmed Interference micro/nanolenses of salts for local modulation of Raman scattering
title_short Interference micro/nanolenses of salts for local modulation of Raman scattering
title_sort interference micro/nanolenses of salts for local modulation of raman scattering
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10624006/
https://www.ncbi.nlm.nih.gov/pubmed/37928860
http://dx.doi.org/10.1039/d3ra05722d
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