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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Published on: October 13, 2017

Sub-diffraction positioning of a two-photon excited and optically trapped quantum dot.

Liselotte Jauffred¹, Anders Kyrsting, Eva C Arnspang

¹The Niels Bohr Institute, University of Copenhagen, Denmark. oddershede@nbi.dk.

|May 20, 2014

Summary

Single optically trapped quantum dots can be visualized and manipulated with lasers. Two-photon excitation causes luminescence blueshift, revealing insights into nanoscale quantum dot control and visualization.

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Area of Science:

Optics and Photonics
Nanotechnology
Biophysics

Background:

Colloidal quantum dots (CQDs) are advanced luminescent probes.
CQDs offer long luminescence lifetimes and two-photon excitation capabilities.
They enable simultaneous single-molecule visualization and force manipulation via lasers.

Purpose of the Study:

To investigate the two-photon excitation and luminescence properties of single optically trapped CQDs.
To explore the feasibility of using CQDs for nanoscale control and visualization.
To understand the factors affecting CQD fluorescence under laser trapping.

Main Methods:

Optical trapping of single colloidal quantum dots.
Two-photon excitation using an infrared laser.
Detection of CQD luminescence with a camera.
Mapping focal volume intensity and correlating with CQD position.

Main Results:

Single optically trapped CQDs can be two-photon excited by the trapping laser.
Sufficient excitation leads to a measurable blueshift in emitted luminescence.
CQDs explore low-intensity regions of the laser focus, explaining intermittent fluorescence (5-10% of the time).

Conclusions:

Optically trapped CQDs can be utilized for simultaneous nanoscale visualization and manipulation.
The observed luminescence blueshift provides a marker for excitation conditions.
Accurate interpretation of experiments using two-photon excited CQDs requires understanding their interaction with the laser focal volume.