A1 Journal article (refereed)
Effect of molecular concentration on excitonic nanostructure based refractive index sensing and near-field enhanced spectroscopy (2023)
Dutta, A., & Toppari, J. J. (2023). Effect of molecular concentration on excitonic nanostructure based refractive index sensing and near-field enhanced spectroscopy. Optical Materials Express, 13(8), 2426-2445. https://doi.org/10.1364/OME.497366
JYU authors or editors
Publication details
All authors or editors: Dutta, Arpan; Toppari, J. Jussi
Journal or series: Optical Materials Express
eISSN: 2159-3930
Publication year: 2023
Volume: 13
Issue number: 8
Pages range: 2426-2445
Publisher: Optica Publishing Group
Publication country: United States
Publication language: English
DOI: https://doi.org/10.1364/OME.497366
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/89017
Web address of parallel published publication (pre-print): https://chemrxiv.org/engage/chemrxiv/article-details/646cc283b3dd6a65309a19e9
Abstract
Organic thin film based excitonic nanostructures are of great interest in modern resonant nanophotonics as a promising alternative for plasmonic systems. Such nanostructures sustain propagating and localized surface exciton modes that can be exploited in refractive index sensing and near-field enhanced spectroscopy. To realize these surface excitonic modes and to enhance their optical performance, the concentration of the excitonic molecules present in the organic thin film has to be quite high so that a large oscillator strength can be achieved. Unfortunately, this often results in a broadening of the material response, which might prevent achieving the very goal. Therefore, systematic and in-depth studies are needed on the molecular concentration dependence of the surface excitonic modes to acquire optimal performance from them. Here, we study the effect of molecular concentration in terms of oscillator strength and Lorentzian broadening on various surface excitonic modes when employed in sensing and spectroscopy. The optical performance of the modes is evaluated in terms of sensing, like sensitivity and figure of merit, as well as near-field enhancement, like enhancement factor and field confinement. Our numerical investigation reveals that, in general, an increase in oscillator strength enhances the performance of the surface excitonic modes while a broadening degrades that as a counteracting effect. Most of all, this demonstrates that the optical performance of an excitonic system is tunable via molecular concentration unlike the plasmonic systems. Moreover, different surface excitonic modes show different degrees of tunability and equivalency in performance when compared to plasmons in metals (silver and gold). Our findings provide crucial information for developing and optimizing novel excitonic nanodevices for contemporary organic nanophotonics.
Keywords: nanostructures; spectroscopy; photonics
Contributing organizations
Related projects
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Ministry reporting: Yes
VIRTA submission year: 2023
JUFO rating: 2