High sensitivity to fabrication errors is a main challenge in using high-Q resonators. Here we show that by carefully choosing the optical tuning using an evolutionary algorithm, a drastically distorted transmission function can be restored. High Q ring resonators have been shown to enable novel functionalities on chip[1,2], however the main challenge in using high Q resonators is their high se...

We propose an ultracompact parallel label-free biosensor based on concentric silicon-on-insulator microring resonators. Our numerical studies show that the proposed biosensor offers higher sensitivity and a larger detection area than conventional single-ring-based sensors. We analyze the detection sensitivity of the DNA hybridization by immobilizing the probe on top of the double concentric rin...

We have proposed a tunable laser with silica-waveguide ring resonators. In this tunable laser, a semiconductor optical amplifier was passively aligned and mounted onto a silica-waveguide substrate. The ring resonators can be tuned by controlling their temperatures using the thermo optic heaters formed on them, and there are no mechanically moving parts. Thus, they are sufficiently stable and re...

In this paper we propose a set of novel tunable optical power splitters based on active microring resonators. They work by operating ring resonators in the transient zone between full resonance and off-resonance states for a specific wavelength. We can achieve different split ratios by either varying the bias voltage, or by selectively enabling a given resonator with a specific split ratio amon...

An interaction of electromagnetic field with metamaterial thin film containing split-ring resonators with Josephson junctions is considered. It is shown that dynamical self-inductance in a split rings results in reduction of magnetic flux through a ring and this reduction is proportional to a time derivative of split ring magnetization. Evolution of thin film magnetization taking into account d...

In an effort to find low-cost alternatives for components currently used in dense wavelength division multiplexing, optical ring resonators fabricated on silicon on insulator are currently being investigated. Their performance can be further enhanced if they are polarization independent. Herein we use rib waveguides to control the polarization properties of the devices and hence produce polariz...

Backscattering can dramatically modify the response of ring resonators and be the limiting parameter of the Q-factor. We present evidence of backscattering, a model, and a fitting procedure that provides a complete characterization of the resonance. Keywords—resonators; backscattering;

Silicon microring resonators very often exhibit resonance splitting due to backscattering. This effect is hard to model in a quantitative and predictive way. This paper presents a behavioral circuit model for ring resonators that quantitatively explains the wide variations in resonance splitting observed in experiments. The model is based on an in-depth analysis of the contributions to backscat...