Real-space observation of spectral degeneracy breaking in a waveguide-coupled disk microresonator

Sylvain Blaize (1) , Felice Gesuele (1) , Ilan Stefanon (1) , Gilles Lerondel (1) , Pascal Royer (1) , Bruno Martin (2) , A. Morand (2) , P. Benech (2) , Jm. Fedeli (3) , Aurélien Bruyant (1)

1 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique
2 IMEP-LAHC - Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation
3 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information

We report on the real-space observation of resonant frequency splitting in a high-Q waveguide-coupled silicon-on-insulator microdisk resonator. Phase sensitive near-field analysis reveals the stationary nature of the two resonant states, and spectral investigations clearly show their orthogonality. These measurements emphasize the role of the coupling waveguide in this splitting phenomenon. The symmetry of the two stationary whispering gallery modes is clearly observed and is found to follow the axial symmetry of the waveguide-coupled microdisk as it has been reported by earlier theoretical predictions.

Mots clés: Whispering gallery modes; Resonant modes; Nanopositioning equipment; Light propagation; Spatial frequency; Q factor

Domaines: Optique / photonique

Sylvain Blaize, Felice Gesuele, Ilan Stefanon, Gilles Lerondel, Pascal Royer, et al.. Real-space observation of spectral degeneracy breaking in a waveguide-coupled disk microresonator. Optics Letters, 2010, pp.3168-3170. ⟨10.1364/OL.35.003168⟩. ⟨hal-00603149⟩