We report Fano resonances in a multimode square glass micropillar resonator; the resonances were obtained by using angle-resolved prism coupling. Our experiments reveal characteristically asymmetric line shapes of high-Q resonances and of detuned low-Q resonances in multimode reflection spectra. The asymmetric resonance line shapes evolve for an approximately pi phase within a 0.5° range of reflection angles. We model our observed asymmetric multimode resonances by the far-field interference between a light wave that is evanescently coupled with a high-Q mode orbit and a coherent light wave that is refractively coupled with a detuned low-Q mode orbit.
© 2005 Optical Society of America
Ho-Tong Lee, Linjie Zhou, and Andrew W. Poon, "Fano resonances in prism-coupled multimode square micropillar resonators," Opt. Lett. 30, 1527-1529 (2005)