Analysis of Förster resonance energy transfer (FRET) in the vicinity of a charged metallic nanosphere via nonlocal optical response method

Champi Abeywickrama, Malin Premaratne, David L. Andrews

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Forster Resonance Energy Transfer (FRET) is a major interparticle energy transfer mechanism used in a wide range of modern-day applications. Hence, enhancing the FRET rate by different mechanisms has been extensively studied in the literature. Obtaining Plasmonic enhanced FRET by placing a metal nanoparticle (MNP) in the vicinity of energy exchanging molecules is one such mechanism. Here we present a model to elucidate the effects of extraneous surface charges present on such a vicinal MNP on the FRET rate considering the nonlocal response of the MNP. This model is based on the well established extended Mie theory of Bohren and Hunt along with the idea of introducing an effective dielectric function for the charged MNP. Our results indicate that the excess surface charges will lead to a blueshift in the resonance frequency and greater enhancements in the FRET rate for both local and nonlocal response based methods. Furthermore, we propose potential substitutes for noble metals that are conventionally used in plasmonic enhanced FRET.

Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationNanophotonics VIII
EditorsDavid L. Andrews, Angus J. Bain, Martti Kauranen, Jean-Michel Nunzi
Place of PublicationBellingham WA USA
PublisherSPIE - International Society for Optical Engineering
Number of pages10
ISBN (Electronic)9781510634633
ISBN (Print)9781510634626
Publication statusPublished - 2020
EventSPIE Photonics Europe 2020 - Virtual, Online, France
Duration: 6 Apr 202010 Apr 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE - International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Photonics Europe 2020
CityVirtual, Online


  • Effective dielectric function
  • Extended mie theory
  • Förster Resonance Energy Transfer
  • Metal nanoparticle
  • Nonlocal response

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