Spinning optical resonator sensor for torsional vibrational applications measurements

Amir R. Ali; Andrew Gatherer; Mariam S. Ibrahim

doi:10.1117/12.2211873

22 April 2016 Spinning optical resonator sensor for torsional vibrational applications measurements

Amir R. Ali, Andrew Gatherer, Mariam S. Ibrahim

Proceedings Volume 9727, Laser Resonators, Microresonators, and Beam Control XVIII; 97271C (2016) https://doi.org/10.1117/12.2211873
Event: SPIE LASE, 2016, San Francisco, California, United States

Abstract

Spinning spherical resonators in the torsional vibrational applications could cause a shift in its whispering gallery mode (WGM). The centripetal force acting on the spinning micro sphere resonator will leads to these WGM shifts. An analysis and experiment were carried out in this paper to investigate and demonstrate this effect using different polymeric resonators. In this experiment, centripetal force exerted by the DC-Motor on the sphere induces an elastic deformation of the resonator. This in turn induces a shift in the whispering gallery modes of the sphere resonator. Materials used for the sphere are polydimethylsiloxane (PDMS 60:1 where 60 parts base silicon elastomer to 1 part polymer curing agent by volume) with shear modulus (G≈1kPa), (PDMS 10:1) with shear modulus (G≈300kPa), polymethylmethacrylate (PMMA, G≈2.6×10⁹GPa) and silica (G≈3×10¹⁰ GPa). The sphere size was kept constant with 1mm in diameter for all above materials. The optical modes of the sphere exit using a tapered single mode optical fiber that is coupled to a distributed feedback laser. The transmission spectrum through the fiber is monitored to detect WGM shifts. The results showed the resonators with smaller shear modulus G experience larger WGM shift due to the larger mechanical deformation induced by the applied external centripetal force. Also, the results show that angular velocity sensors used in the torsional vibrational applications could be designed using this principle.

Citation Download Citation

Amir R. Ali, Andrew Gatherer, and Mariam S. Ibrahim "Spinning optical resonator sensor for torsional vibrational applications measurements", Proc. SPIE 9727, Laser Resonators, Microresonators, and Beam Control XVIII, 97271C (22 April 2016); https://doi.org/10.1117/12.2211873

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