Quantop seminar by Alexander K. Tagantsev
What can be made of the “membrane-in-the-middle” cavity?
The so-called “membrane-in-the-middle” cavity is a widely used opto-mechanical system, which typically consists of a one-sided cavity and a mechanical membrane set close to its middle. A modification of that system, where the membrane is set close to the input mirror, was recently [V. Dumont, … .J. C. Sankey, Opt. express 27, 25731 (2019)] addressed. The presented theoretical analysis revealed that, in the case of the highly reflecting membrane, such a system may provide an enhanced opto-mechanical performance.
The present talk dwells upon two other modifications of the classical membrane-in-the-middle cavity: A) the situation where the membrane is set close to the backstop mirror of a one-sided cavity and B) the case where the membrane is set outside but close to the “non-feeding” mirror of a two-sided cavity. The case of the highly reflecting membrane, T << 1 (T is the power transmission of the membrane) is considered. The opto-mechanical performance of such configurations is asserted using the coupling constant and opto-mechanical cooperativity as figures of merit.
It is shown that, if the membrane is properly positioned, the A configuration provides a gain of cooperativity of least of a factor of 2/T vs. other positions of the membrane. The B configuration, with the properly positioned membrane, yields a regime dominated by the dissipative opto-mechanical interaction with the coupling constant and opto-mechanical cooperativity largely exceeding those of other known systems dominated by such an interaction.
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