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Surface optical sensitivity enhanced by a single dielectric microsphere

  • Single dielectric microspheres can manipulate light focusing and collection to enhance optical interaction with surfaces. To demonstrate this principle, we experimentally investigate the enhancement of the Raman signal collected by a single dielectric microsphere, with a radius much larger than the exciting laser spot size, residing on the sample surface. The absolute microsphere-assisted Raman signal from a single graphene layer measured in air is more than a factor of two higher than thatSingle dielectric microspheres can manipulate light focusing and collection to enhance optical interaction with surfaces. To demonstrate this principle, we experimentally investigate the enhancement of the Raman signal collected by a single dielectric microsphere, with a radius much larger than the exciting laser spot size, residing on the sample surface. The absolute microsphere-assisted Raman signal from a single graphene layer measured in air is more than a factor of two higher than that obtained with a high numerical aperture objective. Results from Mie’s theory are used to benchmark numerical simulations and an analytical model to describe the isolated microsphere focusing properties. The analytical model and the numerical simulations justify the Raman signal enhancement measured in the microsphere-assisted Raman spectroscopy experiments.show moreshow less

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Metadaten
Author:Iuliia Ruzankina, Nikolay Mukhin, Ali Mermoul, Vadim Parfenov, Eduard Fron, Gabriele Ferrini
URL:https://doi.org/10.1364/OE.472720
Parent Title (English):Optics Express
Publisher:Optica
Document Type:Article
Language:English
Year of Publishing:2022
Date of Publication (online):2023/10/11
Year of first Publication:2022
Publishing Institution:Technische Hochschule Brandenburg
Release Date:2023/10/12
Volume:30
Issue:24
Page Number:16
First Page:43021
Last Page:43036
Institutes:Fachbereich Technik
open_access (DINI-Set):open_access
University Bibliography:Hochschulbibliografie
Licence (German):Creative Commons - CC BY - Namensnennung 4.0
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