A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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-tekijät tai -toimittajat

Dutta, Arpan
Toppari, Jussi

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Dutta, Arpan; Toppari, J. Jussi

Lehti tai sarja: Optical Materials Express

eISSN: 2159-3930

Julkaisuvuosi: 2023

Volyymi: 13

Lehden numero: 8

Artikkelin sivunumerot: 2426-2445

Kustantaja: Optica Publishing Group

Julkaisumaa: Yhdysvallat (USA)

Julkaisun kieli: englanti

DOI: https://doi.org/10.1364/OME.497366

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/89017

Rinnakkaistallenteen verkko-osoite (pre-print): https://chemrxiv.org/engage/chemrxiv/article-details/646cc283b3dd6a65309a19e9

Tiivistelmä

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.

YSO-asiasanat: nanorakenteet; spektroskopia; fotoniikka

Liittyvät organisaatiot

Hankkeet, joissa julkaisu on tehty

OKM-raportointi: Kyllä

Raportointivuosi: 2023

Alustava JUFO-taso: 2