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Related Experiment Video

Updated: Feb 24, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Published on: July 21, 2018

Controlling Plasmon-Enhanced Fluorescence via Intersystem Crossing in Photoswitchable Molecules.

Mingsong Wang¹, Gregory Hartmann², Zilong Wu¹

¹Department of Mechanical Engineering, Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.

Small (Weinheim an Der Bergstrasse, Germany)

|August 24, 2017

Summary

Researchers achieved active control of plasmon-enhanced fluorescence using photoswitchable intersystem crossing (ISC) in spiropyran (SP) molecules. This method enables photomodulation of fluorescence in hybrid SP-molecule and nanostructure systems.

Keywords:

intersystem crossing photoswitchable molecules plasmon-enhanced fluorescence plasmonic nanostructures spiropyran

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

Area of Science:

Plasmonics
Photochemistry
Molecular engineering

Background:

Spiropyran (SP) molecules exhibit photoswitchable properties, enabling their use in hybrid systems with plasmonic nanostructures.
Intersystem crossing (ISC) is a key photophysical process that influences fluorescence quantum yield.
Plasmonic nanostructures can enhance electromagnetic fields, impacting light-matter interactions.

Purpose of the Study:

To achieve active control of plasmon-enhanced fluorescence in hybrid systems.
To investigate the role of photoswitchable intersystem crossing (ISC) in spiropyran (SP) molecules for fluorescence modulation.
To explore the application of SP-plasmonic nanostructure systems in information processing, biosensing, and bioimaging.

Main Methods:

Utilizing photoswitchable intersystem crossing (ISC) in spiropyran (SP) molecules.
Synthesizing SP-derived merocyanine (MC) molecules with varying ISC efficiencies (photochemical vs. thermal ring-opening).
Employing gold nanoparticle aggregates to create plasmonic hot spots for enhanced fluorescence.

Main Results:

SP-derived merocyanine (MC) molecules formed by photochemical ring-opening exhibit efficient ISC due to their zwitterionic character.
ISC in quinoidal MC molecules formed by thermal ring-opening is negligible.
High ISC rates, coupled with strong plasmonic field enhancement, significantly improve fluorescence quantum yield.
Demonstrated extensive photomodulation of fluorescence by switching ISC in MC molecules within plasmonic hot spots.

Conclusions:

Photoswitchable ISC in SP molecules provides an effective mechanism for active control of plasmon-enhanced fluorescence.
The ISC-mediated plasmon-enhanced fluorescence offers a novel approach for controlling spontaneous emission near plasmonic nanostructures.
This strategy expands the potential applications of active molecular plasmonics in advanced technologies.