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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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Updated: Dec 16, 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

Optical Trajectory Manipulations Using the Self-Written Waveguide Technique.

Ra'ed Malallah^1,2, Derek Cassidy¹, Min Wan¹

¹School of Electrical and Electronic Engineering, College of Engineering and Architecture, University College Dublin, D 4 Dublin, Ireland.

|July 2, 2020

Summary

This summary is machine-generated.

This study explores Self-Written Waveguide (SWW) formation in photopolymer media. Researchers examined waveguide trajectories and light intensity effects, finding good agreement between models and observations for low-cost optical applications.

Keywords:

fiber optics photo-polymer self-written waveguide

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Area of Science:

Materials Science
Optics
Photonics

Background:

The Self-Written Waveguide (SWW) process enables the formation of optical pathways within photosensitive materials.
Understanding the behavior of photopolymer media during SWW is crucial for developing novel optical devices.
Previous studies have explored SWW but lacked detailed analysis of wet media and fiber alignment effects.

Purpose of the Study:

To investigate the SWW process in wet photopolymer media using a novel thin drop cast layer technique.
To analyze the self-trajectories of waveguides formed within solid materials under varying fiber optic cable (FOC) alignments.
To characterize the optical transmission and waveguide merging phenomena in Acrylamide/Polyvinyl Alcohol (AA/PVA).

Main Methods:

Utilized a thin drop cast layer of dry photosensitive material to study wet photopolymer media behavior.
Examined SWW formation under single-, counter-, and co-fiber exposure configurations.
Employed high-precision microscopy to position FOCs and indirectly monitored SWW formation by imaging emergent light.
Characterized light transmission and waveguide trajectories in AA/PVA (532 nm sensitized).

Main Results:

Observed and analyzed optical waveguide trajectories, including bending and merging, within the AA/PVA photopolymer.
Demonstrated qualitative agreement between theoretical model predictions and experimental observations of waveguide paths.
Identified that maximum refractive index changes occur at locations of highest exposure light intensity, termed 'Primary Eyes' and 'Secondary Eyes'.

Conclusions:

The thin drop cast layer method provides a viable framework for studying SWW in wet photopolymer media.
Fiber alignment significantly influences waveguide trajectories, offering a method for controlling light paths.
The low-cost, flexible, and easily processable nature of these photopolymers makes them promising for integrated optics and photonics applications.