Figure 2. Detection of Joule heat generated at a micro-heater.
(a) A circuit used for the local temperature measurements. The lock-in amplifiers are employed to measure the resistance of the Pt coils. The circuit can also be utilized for measuring the resistance of the Au junction by turning the switch from a to b. (b) A calibration curve of the Pt thermometer. (c,d) Increase in the resistance of Pt heater Rh during a bias ramp plotted as a function of the applied dc voltage Vh (c) and corresponding temperature rise ΔTh depicted as a function of power Ph consumed by the heater (d). (e,f) A concomitant change in the Pt thermometer resistance Rt (e) and corresponding temperature rise ΔTt depicted as a function of power Ph that indicates an increase of the local temperature at the thermometer by heat transfer from the heater via the Au nanobridge (f).