Abstract
We carried out an analysis to investigate the morphology dependent optical resonances shift (MDR) of a rotating spherical resonator. The spinning resonator experiences an elastic deformation due to the centrifugal force acting on it, leading to a shift in its MDR. Experiments are also carried out to demonstrate the MDR shifts of a spinning polydimethylsiloxane (PDMS) microsphere. The experimental results agree well with the analytical prediction. These studies demonstrated that spinning sensor based on MDR may experience sufficient shift in the optical resonances, therefore interfering with its desirable operational sensor design. Also the results show that angular velocity sensors could be designed using this principle.
Highlights
IntroductionHigh optical quality factor resonators have been used for many applications
In recent years, high optical quality factor resonators have been used for many applications
A comparison of Figures 6 and 8 leads to the conclusion that the observed optical shifts are due to the elastic deformation that is induced by imposing an external angular velocity since in the case of 10:1 PDMS no measurable shift was obtained
Summary
High optical quality factor resonators have been used for many applications. An external effect applied to the sphere that induces a change in both the radius, R, (mechanical strain) and the refractive index, n, (due to mechanical stress) leads to a shift in the optical resonance (MDR). When a microsphere (sensing element) of radius a, and index of refraction n is rotating with an angular velocity ω (see Figure 3), its morphology (shape and index of refraction) is perturbed due to the centrifugal force acting on the resonator. This in turn induces a shift in its optical resonances as described in Equation (1).
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