Abstract
Fano resonators have attracted great attention due to their high extinction ratio and sharp asymmetric line shape. And Fano-like resonators have also been investigated and analyzed in plenty of fields, such as optical sensing, signal processing and so on. We propose and demonstrate a Fano-like resonator with a high slope rate (SR) and low-complexity fabrication processing. Our scheme is based on a symmetrical 2 × 2 multimode interferometer (MMI) and two parallel microring resonators (MRRs) which are sandwiched between the two branches of MMI. By appropriately tuning the voltages are applied on the lower branch of MMI and the right MRR, tunable SRs can be obtained. The SR of our scheme can vary from -115.04 dB/nm to -247.54 dB/nm, and the maximum SR is obtained when the power consumption of the micro-heater integrated on right MRR is 6.79 mW. Besides, the SR of our Fano-like resonator can be tuned between positive and negative within a wavelength range of 0.06 nm. Our scheme has the advantages of compact structure, low-complexity fabrication processing, and high flexibility. And it can be widely used in color filters, all-optical switches, and optical sensing.
Highlights
F ANO resonance originates from the interference between a discrete localized state and a continuum state has attracted great attention due to its high extinction ratio (ER) and sharp asymmetric line shape [1]
We have proposed and demonstrated a Fano-like resonator with high slope rate (SR) and low-complexity fabrication processing
By tuning the voltages are applied on the lower branch of MMI, tunable SR varying from -180.82 dB/nm to -206.55 dB/nm can be obtained
Summary
F ANO resonance originates from the interference between a discrete localized state and a continuum state has attracted great attention due to its high extinction ratio (ER) and sharp asymmetric line shape [1]. With the rise of complementary metal-oxidesemiconductor (CMOS) manufacturing technology, the schemes based on silicon-on-insulator (SOI) platform have become one of the research focuses currently [16]–[19]. These schemes can be classified into three categories: schemes based on photonic crystal, single microring resonator (MRR), and Sagnac loop. We theoretically analyze and experimentally verify a novel Fano-like resonator with high SR and low-complexity fabrication processing. Our scheme has the advantages of compact structure, low-complexity fabrication processing, and high flexibility It can be widely used in optical communication systems and optical signal processing
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