Study Of Eye-like Resonator Of Sharpness Based On Fano Resonance

Microring resonator sensors, which are based on evanescent wave theory andhave unique microring resonator enhancement, can achieve high sensitivity,moreover target molecules are not need to be labeled. Now microring resonator ismanufactured by silicon on insulator, the silicon on insulator has good lightpropagation and refractive index difference, the crafts of silicon on insulator iscompatible with mature complementary metal oxide semiconductor(CMOS). Themicroring resonator is based on planar waveguide, which can not only treat chemicalsurface modifications easily, but also can integrate with microfluidic system easily.In this paper, the sharpness with the drop port spectra of eye-like resonator areanalyzed in detail, the Eye-like resonator consists two rings resonators with the outerloop coupled to two bus waveguides and the inner loop couple to the outer loop. thesharpness with resonance peak and valley has great significance for microringresonator sensor resolution, in the same spectral instruments, the greater sharpnessmeans a higher detection limit, for microring resonator sensors, obtaining a greatersharpness can enhance the sensitivity of the microring sensor. Numerical calculationof spectrum on the drop port is utilized by the transfer matrix method, as the roundtrip loss varies, changing the outer loop and inner loop coupling coefficient, thevalue of sharpness increases with the round trip loss, however, the maximum valueof sharpness of Fano-resonance change slowly in the round trip loss varies and alager range of the outer loop and inner loop coupling coefficient, as the round trip loss and the outer loop and inner loop coupling coefficient varies, the correspondingtransmission at the resonant point remains almost unchanged, about-6dB. Thesharpness of Fano resonant peak is insensitive for the coupling coefficients, whichcan reduce the requirements of manufacture of coupling region. As loss and couplingcoefficient is given, the outer perimeter is also given, the maximum of sharpness canbe obtained by reducing the inner ring, the amount of change is small, the smallerinner perimeter, the more gradual change on both sides of the maximum of sharpness,which indicates that in the case of loss and coupling coefficient is determined, theouter and inner perimeter has many options, according to different layout needs,designing different perimeter, so this is convenient for designing eye-like resonator,the main contents are listed as follows:1. In this paper, key parameters of the sharpness with the drop port spectra ofeye-like resonator are analyzed in detail, moreover, compared with the single-ringresonator.2. We analyze the sensing mechanism and sensor schemes measuring withoptical microring resonator and the corresponding sensitivity of expression, andanalyzes the factors that affect the sensitivity. We test immune beads by using opticalwaveguide microring resonator.