A nanowire device is disclosed that includes first and second nanowires, a gate structure positioned around a portion of the first and second nanowires and a phase change material surrounding at least a portion of the first nanowire in the sourcedrain regions of the device but not surrounding the second nanowire in the sourcedrain regions. An optical sensor is adjacent to a glass plate, and a support element supporting the optical sensor. The back focal position of an objective lens and the exit end position of the optical fiber are made conjugate by a condenser lens provided inside a reflecting illumination projecting tube. A damper structure may be located between the pump and the junction. Sensor types which may be part of the present device include, for example, a temperature sensor, a MEM electrochemical sensor, a MEM accelerometer, a MEM contact switch lubricity sensor, andor an inductive metallic wear sensor.