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Whispering gallery mode profiles in a coated microsphere |
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| Authors: | D Risti? A Chiappini M Mazzola D Farnesi G Nunzi-Conti GC Righini P Féron G Cibiel M Ferrari M Ivanda |
| Institution: | 1. Institut Ru?er Bo?kovi?, Bijeni?ka cesta 54, 10000, Zagreb, Croatia 2. IFN — CNR CSMFO Lab., Via alla Cascata 56/C Povo, 38123, Trento, Italy 3. IFAC — CNR, MDF Lab., 50019, Sesto Fiorentino, Italy 4. Enrico Fermi Centre, Piazza del Viminale 1, 00184, Roma, Italy 5. FOTON-Systèmes Photoniques (CNRS-UMR 6082), ENSSAT, 6 rue de Kerampont, CS 80518, 22305, Lannion Cedex, France 6. Centre National d’Etudes Spatiales (CNES), 31401, Toulouse Cedex 9, France |
| Abstract: | The properties of whispering gallery modes (WGM) of a microsphere can be tailored by coating the resonator with a thin film. If the coating has a higher refractive index than the microsphere core, the resulting structure will have a configuration which has similarities both with a classical WGM resonator and with a planar waveguide. By choosing the film thickness and refractive index we can tailor the degree of confinement of the WGMs inside the sphere core, coating and surrounding medium, which will in turn influence the WGMs contact with its surroundings. We present a study of the effect of the coating on the WGM mode profiles in particular of a silicon coating on a silica sphere. |
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