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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Related Experiment Video

Updated: May 12, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Measuring three-dimensional interaction potentials using optical interference.

Nassir Mojarad¹, Vahid Sandoghdar, Madhavi Krishnan

¹Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, 5232 Villigen, Switzerland.

|April 24, 2013

Summary

This summary is machine-generated.

Three-dimensional imaging with interferometric scattering (iSCAT) precisely tracks nano-objects in solution. This label-free technique enables high-speed, accurate 3D tracking for studying interaction potentials.

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Last Updated: May 12, 2026

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Area of Science:

Nanotechnology
Optical Imaging
Physical Chemistry

Background:

Measuring interaction potentials of nano-objects in solution is crucial for understanding nanoscale phenomena.
Existing methods may lack the speed, precision, or label-free capabilities required for dynamic studies.

Purpose of the Study:

To apply three-dimensional scattering interferometric (iSCAT) imaging for precise measurement of spatial interaction potentials.
To demonstrate high-speed, label-free 3D tracking of nano-objects in solution.

Main Methods:

Utilized three-dimensional scattering interferometric (iSCAT) imaging.
Studied electrostatically trapped gold particles within a nanofluidic device.
Focused on axial particle localization near a reflecting interface.

Main Results:

Achieved high-speed (~kHz) particle tracking with subnanometer axial localization precision.
Demonstrated an average lateral localization precision of 2.5 nm.
Showed good agreement between measured and calculated levitation heights of trapped particles.

Conclusions:

iSCAT imaging provides label-free, high-speed, and accurate 3D tracking of nano-objects.
This technique is well-suited for probing weak and long-range interaction potentials in solution.
The method offers significant advancements in nanoscale metrology.