Diffraction limited ultra-small photonic-crystal ring resonators with low loss

There is an increasing and largely unfulfilled need for nanometer-scale photonic components, both passive and active, in intra-chip optical communications and other high-speed, ultra-low- power photonic applications. Silicon-based components are favored because they are capable of on-chip-network integration with CMOS electronics. This paper presents a detailed analysis of radiative waveguide bend loss in single-ring PCRRs, as well as bend loss in micro-strip rings as a function of effective radius from 1 to 15 mum at lambda ~ 1550 nm.