Realisation of ultra-low loss photonic crystal slab waveguide devices

Abstract

In this paper we demonstrate low loss transmission both above and below the primary band-gap for a photonic crystal (PC) super-prism device consisting of 600 lattice periods. By modifying the refractive index of the holes, we reduce overall insertion loss to just 4.5 dB across the entire visible spectrum. We show that the remaining loss is predominantly due to impedance mismatch at the boundaries between patterned and unpatterned slab waveguide regions. Experimental loss measurements compare well with finite difference time domain simulations. q

High quality planar silicon nitride microdisk resonators for integrated photonics in the visible wavelength range

“…Nevertheless, most of the research on silicon nitride has been concentrated on infrared (IR) [13,14,15,16,17,18] or near infrared (NIR) [19,4] applications. The few reported works on Si 3 N 4 photonic crystals [20,21,22,23,24,25] and microring resonators [26] in the visible range were of considerably lower fabrication quality compared with their Si counterparts.…”