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Discovery of higher order reentrant modes by constructing a cylindrical symmetric ring and post cavity resonator

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arxiv 1309.7902 v3 pith:A5OTQCGB submitted 2013-09-27 physics.ins-det physics.optics

Y. Fan , Z. Zhang , N. C. Carvalho , J-M. Le Floch , Q. Shan , M. E. Tobar This is my paper · ORCID
classification physics.ins-detphysics.optics
keywords cavitymodespostreentrantresonatorsensitiveapplicationsbetter
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abstract

Analysis of the properties of resonant modes in a reentrant cavity structure comprising of a post and a ring was undertaken and verified experimentally. In particular we show the existence of higher order reentrant cavity modes in such a structure. Results show that the new cavity has two re-entrant modes, one which has a better displacement sensitivity than the single post resonator and the other with a reduced sensitivity. The more sensitive mode is better than the single post resonator by a factor of 2 to 1.5 when the gap spacing is below 100 $ \mu$m. This type of cavity has the potential to operate as a highly sensitive transducer for a variety of precision measurement applications, in particular applications which require coupling to more than one sensitive transducer mode.

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