Abstract
We demonstrate a novel way to generate Fano resonance with tunable wavelength, extinction ratio, and slope rate. The device is a silicon add-drop microring with two integrated tunable reflectors inside, which form an embedded Fabry-Perot cavity. The fabrication is executed at a commercial CMOS foundry. Fano resonance at the drop port is generated from the interference between the Fabry-Perot cavity mode and the ring resonance mode. By tuning the reflectivities of these two reflectors with integrated heaters, various Fano resonance shapes can be achieved with a maximum extinction ratio over 40 dB and a slope rate more than 700 dB/nm.
Highlights
Fano resonance originates from the interference between a continuous background mode and a discrete resonant mode and has attracted strong research interest since it was first proposed by Fano.[1]
These two reflectors form an embedded Fabry-Perot cavity [illustrated in Figs. 1(b) and 1(d)] which generates a slowly varying background mode that interferes with the discrete ring resonances at the drop port of the ring resonator
Zhang et al made an experimental implementation of the structure proposed by Fan in a silicon photonics platform,[10] where they used two sidewall gratings as the partially transmitting elements
Summary
Fano resonance originates from the interference between a continuous background mode and a discrete resonant mode and has attracted strong research interest since it was first proposed by Fano.[1]. An actively controlled silicon ring resonator with a fully tunable Fano resonance
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