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Critical experimental tests of the time-dependent Abraham force inphenomenological electrodynamics are scarce. In this paper we analyze thepossibility of making use of intensity-modulated whispering gallery modes in amicroresonator for this purpose. Systems of this kind appear attractive, as thestrong concentration of electromagnetic fields near the rim of the resonatorserves to enhance the Abraham torque exerted by the field. We analyze mainlyspherical resonators, although as an introductory step we consider also thecylinder geometry. The order of magnitude of the Abraham torques are estimatedby inserting reasonable values for the various input parameters. As expected,the predicted torques turn out to be very small, although probably not beyondany reach experimentally. Our main idea is essentially a generalization of themethod used by G. B. Walker et al. [Can. J. Phys. 53, 2577] for low-frequencyfields, to the optical case.

On the Possibility of Measuring the Abraham Force using Whispering Gallery Modes