A surgical instrument comprising a surgical instrument with opposing jaw members for clamping tissue therebetween. According to the present invention, a monolithically integrated EnhancementDepletion mode HEMT having a uniform threshold voltage can easily be fabricated. The plug carries circuitry that communicates wirelessly with circuitry of the communication module. The protrusions and their tiling arrangement are configured for efficient extraction of light from the device via the upper surface of the first layer and in a beam that is substantially more directional than from a Lambertian source An enhanced device employs a reflector beneath the second layer to utilize the microcavity effect.