Hybrid photonic-plasmonic systems provide a versatile platform for the study and control of light matter interactions, as the hybrid modes of such a system can inherit both the high quality factors and low mode volumes of the photonic and plasmonic modes, respectively. In practice, however, optimization of photonic performance is hindered by an inability to measure and control critical system parameters. In this work, we analyze a photonic-plasmonic system composed of metallic nanoparticles deposited onto a toroidal microresonator. We show that coherent energy exchange between the plasmonic modes of the nanoparticle and whispering-gallery modes (WGMs) of the microresonator results in observable Fano resonances, indicative of photonic-plasmonic hybridization. Guided by theory, we present a general method to infer crucial system parameters such as the coupling energy from experimentally acquired absorption spectra. In addition, we show that by controlling the detuning between the plasmonic and WGM modes, the Fano lineshape can be sculpted and used to tune the degree of photonic-plasmonic hybridization, allowing for control over the mode volume, quality factor and Purcell factor of the system's hybrid modes.

Using Fano resonances to measure and control photonic-plasmonic hybridization

255th National Meeting (2018)

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