Real-space observation of spectral degeneracy breaking in a waveguide-coupled disk microresonator.
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.
Blaize
Sylvain
S
Laboratoire de Nanotechnologie et d’Instrumentation Optique, Institut Charles Delaunay, Université de Technologie de Troyes, 12 rue Marie-Curie BP2060 10010 Troyes, France. blaize@utt.fr
Gesuele
Felice
F
Stefanon
Ilan
I
Bruyant
Aurélien
A
Lérondel
Gilles
G
Royer
Pascal
P
Martin
Bruno
B
Morand
Alain
A
Benech
Pierre
P
Fedeli
Jean-Marc
JM