A composite comprising a silicon based substrate, an environmental barrier coating with a top layer, wherein the top layer comprises a velocity barrier layer. In one approach, a body bias is applied to a substrate of the non-volatile memory device by coupling the substrate to a source voltage or a voltage which is a function of the source voltage. The filter also includes an absorptive element that absorbs light non-uniformly over the visible region. The reception acknowledgement information from the reception side radio communication device is written in the beacon and returned.