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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Collective fluorescence enhancement in nanoparticle clusters.

Siying Wang¹, Claudia Querner, Tali Dadosh

¹Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Nature Communications

|June 23, 2011

Summary

Interactions within nanorod (NR) clusters significantly alter their light emission patterns. The duration of light emission (

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Area of Science:

Nanotechnology
Materials Science
Quantum Optics

Background:

Single semiconductor nanoparticles exhibit intermittent light emission (blinking) under continuous illumination.
Blinking statistics, characterized by 'on' and 'off' times, often follow Lévy statistics.
While single quantum dots and large ensembles are studied, small ensembles' fluorescence dynamics are less understood.

Purpose of the Study:

To investigate the fluorescence blinking statistics of small nanorod (NR) ensembles.
To determine if interactions within NR clusters influence blinking behavior.
To explore novel collective nanoscale effects.

Main Methods:

Experimental observation of fluorescence from NR clusters under continuous illumination.
Statistical analysis of 'on' and 'off' time distributions in NR clusters.
Comparison of blinking statistics between clustered and well-separated NRs.

Main Results:

Blinking nanorods (NRs) in a cluster exhibit significantly increased 'on' times.
The maximum 'on' time in a cluster of N NRs increases by a factor of N or more compared to N isolated NRs.
The scaling of increased 'on' times with N reveals a novel collective nanoscale phenomenon.

Conclusions:

Interactions within NR clusters fundamentally alter their fluorescence blinking statistics.
Collective dynamics at the nanoscale can be identified through statistical properties of light emission.
This study highlights a new interaction-induced effect in nanoscale systems.