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Updated: Jun 24, 2026

Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Deterministic, dynamically reconfigurable single quantum emitters enabled by tip-enhanced nano-optical trapping

Yeonjeong Koo^1,2, Jaehun Shin¹, Jonggeun Hwang^1,3

¹Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea.

Nature Communications

|June 22, 2026

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Summary

This summary is machine-generated.

This study introduces tip-enhanced nano-optical trapping spectroscopy for dynamically controlling single quantum emitters. This breakthrough enables precise manipulation of quantum dots (QDs) for advanced quantum technologies.

Area of Science:

Quantum Optics
Nanotechnology
Spectroscopy

Background:

Nanocavity optical trapping allows precise positioning of nanoscale objects like quantum emitters.
Real-time control over quantum emitter properties (position, polarization, brightness, wavelength) is crucial for quantum applications but remains challenging.
Achieving dynamic modulation is key for ultra-secure quantum communication and adaptive quantum sensing.

Purpose of the Study:

To present a novel method for deterministic and dynamically reconfigurable single quantum emitters.
To enable precise positioning and dipole alignment of cavity-coupled quantum dots (QDs).
To achieve simultaneous nano-spectroscopic analysis and dynamic tuning of quantum emission characteristics.

Main Methods:

Utilizing tip-enhanced nano-optical trapping spectroscopy with shear-force atomic force microscopy in liquid.

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Optical Trapping of Nanoparticles

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Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

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Employing nano-optical gradient forces and field-induced torque for QD manipulation.

Dynamically controlling tip-cavity mode volume and tip-induced pressure for tuning trapping and coupling.

Main Results:

Demonstrated precise positioning and dipole alignment of cavity-coupled single quantum dots (QDs).
Achieved dynamic modulation of quantum emission characteristics (brightness, photon energy) by tuning trapping and coupling.
Showcased control from weak to strong coupling regimes.

Conclusions:

This work advances the realization of dynamically reconfigurable single quantum emitters.
The developed technique is vital for harnessing the potential of QDs in quantum applications.
Enables tuning of single photon sources for quantum switches, modulators, and quantum gates.