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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.

Propagation of Waves

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...

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Related Experiment Video

Updated: Jun 10, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Multiregion Light Control in Diffusive Media via Wavefront Shaping.

Liam Shaughnessy¹, Rohin E McIntosh¹, Arthur Goetschy²

¹Department of Applied Physics, <a href="https://ror.org/03v76x132">Yale University</a>, New Haven, Connecticut 06520, USA.

Physical Review Letters

|October 18, 2024

Summary

This summary is machine-generated.

Wavefront shaping enhances light focusing in scattering media by improving target contrast. New operators maximize power delivery while minimizing background noise for advanced applications.

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Area of Science:

Optics and Photonics
Wave Phenomena
Light Scattering

Background:

Wavefront shaping enables light focusing through scattering media.
Increased background intensity reduces target contrast in diffusive systems.

Purpose of the Study:

To develop methods for spatially resolved light control in diffusive systems.
To enhance target contrast and power delivery in scattering media.

Main Methods:

Combining transmission/deposition matrices for different regions.
Constructing joint operators for spatially resolved control.
Utilizing contrast and difference operators.

Main Results:

Achieved spatially resolved control of light in diffusive systems.
Maximized power contrast between target and surroundings using contrast operator eigenmodes.
Enhanced power delivery to targets while avoiding background increase with difference operators.

Conclusions:

Developed novel operators for improved light focusing and contrast in scattering media.
Demonstrated spatially resolved control for enhanced light delivery.
Opened possibilities for coherent control of nonlocal effects in wave transport.