In this communication, we present the potentialities offered by 2D photonic crystals to trap and absorb photons in thin silicon layers. We will specifically focus on the impact of the photonic crystal unit cells symmetry, and the possibility to increase light absorption and generated photocurrent using multi-periodic and pseudo-disordered photonic nanostructures.
The on-coming photonic layer of CMOS integrated circuits needs efficient light sources to treat and transmit the flow of
data. We develop new configurations of III-V/Si vertical cavity lasers coupled to silicon optical waveguides using
mirror/coupler based on photonic crystals. These devices can be fabricated using fully CMOS-compatible technological
steps. Using this approach, the optical gain is provided by the III-V material, while all the remaining part of the optical
cavity is in silicon. The output coupling to the sub-µm waveguides of the CMOS optical layer can then be inherently
optimised since the laser mirror/coupler and the Si output waveguides will be realised together during the same
It has been demonstrated that photonic crystals membrane can act as very efficient reflectors (PCM-mirrors) for vertical
microresonators. In this communication, the design of a vertical cavity microlaser based on these PCM-mirrors will
be presented. We will show that high Q-factors (>10000) along with strong vertical and lateral confinements can be
achieved. As a first demonstration, experimental results on silicon PhC-mirrors and associated vertical cavities will be
discussed, showing Q factors larger than 2000. Finally, theoretical results on the coupling between such cavities and a
silicon micro-waveguide will be presented.
Low cost, robust and efficient light sources are suitable for optical high speed communications in integrated circuits.
Microdisk resonator lasers correspond to one of the most adapted solution in regard to their performances and their
processing easiness. They mix low space dimension and low power consumption (threshold<50 μW). The use of dies
of InP membranes bonded onto 200 mm SOI wafers allows the fabrication of a complete optical link, with an
optical InP based microsource, Si waveguides and sensors for signal collection. Contacting such sources complies with
the necessity of using metals - more generally optical absorbing elements - and the necessary low power consumption to
stand up traditional electrical circuits. In this paper, we investigate design rules of contacts using a simple model for fast
estimated results which are compared to 3D FDTD simulations. In a second part, we will discuss the coupling between a
microdisk resonator and a Si waveguide. Then we will describe the fabrication of such devices with a 200mm CMOS
pilot line and point out the technological induced limitations.