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Tumor Spheroid Fabrication and Encapsulation in Polyethylene Glycol Hydrogels for Studying Spheroid-Matrix Interactions

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Electrooptic properties of absorbing spheroids.

M Kerker, D D Cooke

|January 30, 2010

Summary

The electrodichroic ratio of absorbing spheroids was calculated, showing higher transmission when particles align with light. Aluminum-like metals show promise for optical windows.

Area of Science:

Optics and Photonics
Materials Science

Background:

Electrodichroism describes the change in light absorption by particles under an electric field.
Suspensions of absorbing spheroids are relevant for optical applications.
Previous studies have explored light scattering by spheroids.

Purpose of the Study:

To calculate the electrodichroic ratio q(ro) for suspensions of absorbing spheroids.
To investigate the influence of particle alignment, complex refractive index, and axial ratio on electrodichroism.
To identify suitable materials for electrodichroic optical windows.

Main Methods:

Utilized dipolar light scattering theory for calculations.
Modeled suspensions of absorbing spheroids.
Analyzed the electrodichroic ratio q(ro) under varying conditions.

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Main Results:

The theory predicts higher transmission when spheroids align 'nose-on' to the incident beam compared to a random state.
Experimental observations on Varad suspensions confirm this prediction.
The complex refractive index and axial ratio significantly affect the electrodichroic ratio.

Conclusions:

Electrodichroic ratio calculations align with experimental findings for spheroid suspensions.
Materials with refractive properties similar to aluminum are optimal for developing electrodichroic optical windows.
The study provides insights into the optical behavior of absorbing spheroids for potential device applications.