Understanding Dielectric Spheres in Optical Tweezers

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im confused about what a dielectric sphere is. I have tried googleing it but i couldn't find anything that useful, please help
 
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It's a sphere made of a dielectric material. A "dielectric" is a (usually) electrically insulating material such as you put between the plates of a capacitor in order to increase the capacitance.

What is the context of your question?
 
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it is in relation to optical tweezers, i read on wikipedia that they can be used for things such as a dielectric sphere.
 

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