Integration density, channel scalability, low switching energy and low insertion loss are the major prerequisites for on-chip WDM systems. A number of device geometries have already been demonstrated that fulfill these criteria, at least in part, but combining all of the requirements is still a difficult challenge. I will present our recent work on photonic crystal enhanced light sources, modulators and detectors for silicon photonics, that promise to give the ultimate in low energy and area consumption.
We demonstrate electrically pumped silicon nano-light source at room temperature,
having very narrow emission line (<0.5nm) at 1500nm wavelength, by enhancing the
electroluminescence (EL) via combination of hydrogen plasma treatment and Purcell
effect. The measured output power spectral density is 0.8mW/nm/cm<sup>2</sup>, which is
highest ever reported value from any silicon light emitter.
We experimentally demonstrate a new optical filter design comprising of a photonic crystal cavity and a low index bus
waveguide which are monolithically integrated on a silicon-on-insulator (SOI) platform. We have fabricated oxide clad
PhC cavities with a silicon nitride waveguide positioned directly above, such that there is an overlap between the
evanescent tails of the two modes. We have realised an extinction ratio of 7.5dB for cavities with total Q of 50,000.