Accelerating the Heat Diffusion: Fast Thermal Relaxation of a Microcantilever
Résumé
In most systems, thermal diffusion is intrinsically slow with respect to mechanical relaxation. We devise here a generic approach to accelerate the relaxation of the temperature field of a 1D object, in order to beat the mechanical time scales. This approach is applied to a micro-meter sized silicon cantilever, locally heated by a laser beam. A tailored driving protocol for the laser power is derived to quickly reach the thermal stationary state. The model is implemented experimentally yielding a significant acceleration of the thermal relaxation, up to a factor 30. An excellent agreement with the theoretical predictions is reported. This strategy allows a thermal steady state to be reached significantly faster than the natural mechanical relaxation.
Domaines
Physique [physics]
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FastHeating.pdf (2.57 Mo)
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tf=0.1tau-N=1.mov (4.33 Mo)
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tf=0.1tau-N=2.mov (3.76 Mo)
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tf=0.1tau-N=3.mov (3.32 Mo)
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tf=0.1tau-N=4.mov (3.15 Mo)
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