La Corporation De L'ecole Polytechnique

Ecole Polytechnique

John F Currie

Kenneth O Hill

Seyed-Iraj Najafi

Andre Lecours

Chetlur S Sundararaman

Dentcho V Ivanov

The channel region of the FET device has a first portion adjacent the source which has a higher bandgap energy or a higher electron affinity than a remaining portion of the channel. A quasi-electric field in the channel near the source is intensified and as a result, accelerates charge carriers in the channel and increases switching speed. An infrared controlled FET device is also disclosed in which a low bandgap channel layer has a large bandgap layer deposited on it to result in a conduction band discontinuity at the junction between the large bandgap semiconductor layer and the low bandgap channel layer and a two-dimensional electron gas (2DEG) channel in the low bandgap channel layer so that photons reaching the 2DEG eject charges and allow conduction through the channel layer.

Field effect devices

A medication dispensing device for implantation into an animal or human body, comprises a plurality of compartments each containing a dose of medicine to be dispensed and having a delivery opening permitting delivery of the medicine; a rupturable membrane sealing the delivery opening of each compartment, the membrane having a predetermined elastic deformation limit and a predetermined rupture point; and a membrane rupturing system associated with each compartment for rupturing the membrane thereof in response to an electrical signal. The membrane rupturing system includes a stress-inducing member maintaining the membrane stressed to substantially the elastic deformation limit thereof, and a piezoelectric transducer responsive to the electrical signal for applying to the membrane additional stress sufficient to exceed the rupture point of the membrane, thereby causing the membrane to rupture and allowing body fluids to enter into the compartment for mixing with the medicine contained therein so that the medicine is released in admixture with the body fluids through the delivery opening into the animal or human body. The medication dispensing device of the invention further comprises a control circuit connected to a power source for supplying the electrical signal to a respective piezoelectric transducer of each membrane rupturing system to activate the respective piezoelectric transducer.

Implantable medication dispensing device

The present disclosure describes an optical waveguide device and a method for making such device. The device comprises a substrate; a waveguide embedded in the substrate, the waveguide having a refractive index higher than the refractive index of the substrate; and first and second optical mirrors placed respectively in two different positions along the waveguide. The method comprises steps of (a) cleaning a substrate by means of a cleaning agent; (b) embedding a waveguide in the substrate; and (c) placing first and second optical mirrors respectively at two different positions in the substrate, the steps (b) and (c) being performed in such a manner that the mirrors being positioned along the waveguide.

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Montreal, Canada

John F Currie