The transmission spectra of a Fabry–Perot etalon coupled to a microtoroid resonator are studied theoretically and experimentally. The resonance line shapes depend strongly on the resonance wavelength detuning and coupling strength between the two resonators. A wide variety of line shapes, ranging from a single to triple peaks, symmetric to asymmetric Fano-like peaks, and notches were predicted and observed experimentally. The capability to modify the spectral line shapes by tuning the coupling between or losses of two resonators may find applications in optical filtering, switching, sensing, and dispersion engineering.
© 2006 Optical Society of America
Original Manuscript: September 26, 2005
Manuscript Accepted: October 30, 2005
Wei Liang, Lan Yang, Joyce K. Poon, Yanyi Huang, Kerry J. Vahala, and Amnon Yariv, "Transmission characteristics of a Fabry-Perot etalon-microtoroid resonator coupled system," Opt. Lett. 31, 510-512 (2006)