THERMAL SENSORS FOR INVESTIGATION OF HEAT-TRANSFER IN SCANNING PROBE MICROSCOPY

Planar thermocouples designed for investigation of heat transfer in sc anning tunneling microscopy and scanning thermal microscopy are descri bed. The limit of sensitivity to local thermal power can be as small a s 10 nW. The devices are based on two different thin films formed as a cross on a thin glass substrate. Heat fluxes in the cross point can b e detected by measuring the thermoelectric signal from two ends of the cross. As described elsewhere planar thermocouples of this type have been successfully used to detect the energy which is deposited by tunn eling electrons and to measure the heat which is coupled across a subm icron vacuum gap between two metals by the fluctuating fields of elect romagnetic surface modes.