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Local probing of thermal properties at submicron depths with megahertz photothermal vibrations
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10.Transmission of the light through the (hollow) tip, of refractive index ∼2, was found not to significantly change the diameter of the (approximately Gaussian) optical spot at the sample relative to that above the tip. We use subpicosecond optical pulses with 82 MHz repetition rate, but we checked this had no influence on the sub-10 MHz dynamics here.
11.TM Microscopes, Sharp Uncoated Microlever E. It is V shaped, of thickness 0.6 μm, length 140 μm, width of a V branch 18 μm, and is inclined to the sample at 15°.
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19.Based on the calculated 3D temperature field only. In the Cr and Al films used, κ may be less than the bulk values assumed.
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21.The tip length prevents significant heating of the cantilever by thermal conduction in air: at 4.2 MHz. The thermal expansion of the tip may contribute: For silicon nitride, at 4.2 MHz and leading to an estimated maximum contribution to the vibration amplitude at equal to assuming periodic temperature variations equal to that of the sample
21.However, the smaller OHFM signal observed for the one-layer region of the sample, where is larger, suggests that tip expansion is not dominant.
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