Eur. Phys. J. D 23, 273-277 (2003)
https://doi.org/10.1140/epjd/e2003-00034-8

High-Q whispering gallery modes in a spherical shell dielectric resonator: Characterization at microwave frequencies

¹ Institute for Chemical-Physical Processes, CNR, Via G. Moruzzi 1, 56124 Pisa, Italy
² IRCOM (U.A. CNRS 356) , U.F.R. des Sciences, Université de Limoges, 87060 Limoges Cedex, France 


Corresponding author: ^a longo@ifam.pi.cnr.it

Received: 25 October 2002
Published online: 4 February 2003

Abstract

We present a numerical and experimental characterization of high-Q whispering gallery resonant modes excited in a fused quartz spherical shell operated in the 18–26.5 GHz band; easy coupling and selection of modes is a most advantageous feature of the proposed structure with respect to ordinary bulk resonators. The numerical results, based on a finite element algorithm, well match experimental data, which also show the capability of our device to perform gaseous spectroscopy measurements.