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Related Experiment Video

Updated: Jun 22, 2026

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Label-free Single Molecule Detection Using Microtoroid Optical Resonators

Published on: December 29, 2015

A single-molecule optical transistor.

J Hwang¹, M Pototschnig, R Lettow

¹Laboratory of Physical Chemistry and optETH, ETH Zurich, 8093 Zurich, Switzerland.

|July 3, 2009

Summary

This summary is machine-generated.

Researchers developed a quantum optical transistor using a single dye molecule. This device can control light signals at the nanoscale, paving the way for future quantum technologies.

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Last Updated: Jun 22, 2026

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Area of Science:

Quantum optics
Nanotechnology
Molecular electronics

Background:

Transistors are crucial for modern technology.
Controlling light at the nanoscale is challenging for quantum information processing.
Conventional nonlinear materials are ineffective at the nanoscale.

Purpose of the Study:

To demonstrate a single-molecule optical transistor.
To explore coherent attenuation and amplification of light using single molecules.
To investigate manipulation of non-classical light fields.

Main Methods:

Utilizing optical resonances in a single dye molecule.
Employing a gating laser beam to control population inversion.
Focusing laser beams to the nanoscale.

Main Results:

A single dye molecule successfully operated as an optical transistor.
Coherent attenuation and amplification of a laser beam were achieved.
Demonstrated potential for manipulating single-photon light fields.

Conclusions:

Single molecules can function as optical transistors.
This opens possibilities for nanoscale optical signal control.
Addresses challenges in quantum information processing with light.