Abstract
This paper investigates the possible chemical changes in polydimethylsiloxane (PDMS) caused by two different techniques of fabrication for ultra-sensitive electric field optical sensors. The sensing element is a micro-sphere made from 60:1 PDMS (60 parts base silicon elastomer to one part polymer curing agent by volume). The measurement principle is based on the morphology dependent resonances (MDR) shifts of the micro-sphere. We present the effects of curing and poling of polymer micro-spheres used as optical sensors. The degree of curing leads to changes in the de-poling time which results from dangling bonds in the polymeric chains. Consequently, the longevity of the sensitivity of the sensor can extended by two orders of magnitude. An analysis is carried out along with preliminary experiments to investigate that behavior.
Highlights
In this paper, optical cavities depending on morphology-dependent resonances (MDR) will be used to sense the applied electric field
When the sphere is subjected to the external electric field, its morphology changes
When the sphere is subjected to the external electric field, its morphology changes due to the electrostriction effect
Summary
Optical cavities depending on morphology-dependent resonances (MDR) will be used to sense the applied electric field. The condition for optical resonance is 2π Rn 0 ≈ lλ, where λ is the vacuum wavelength of the light (supplied by a laser), l is an integer, R is the sphere radius, and n0 is the sphere’s refractive index. When the sphere is subjected to the external electric field, its morphology changes (elastic deformation) due to the electrostriction effect. This, in turn, causes a perturbation of both the radius ( R) and refractive index ( n), leading to a shift in the optical resonance (MDR), as due to the electrostriction effect. This, in turn, causes a perturbation of both the radius (∆R) and follows: refractive index (∆n), leading to a shift in the optical resonance (MDR), as follows:.
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