Photonic Excitation of a Micromechanical Cantilever in Electrostatic Fields - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2020

Photonic Excitation of a Micromechanical Cantilever in Electrostatic Fields

Résumé

We present a specific near-field configuration where an electrostatic force gradient is found to strongly enhance the optomechanical driving of an atomic force microscope cantilever sensor. It is shown that incident photons generate a photothermal effect which couples with electrostatic fields even at tip-surface separations as large as several wavelengths, dominating the cantilever dynamics. The effect is the result of resonant phenomena where the photothermal-induced parametric driving acts conjointly (or against, depending on electric field direction) with a photovoltage generation in the cantilever. The results are achieved experimentally in an atomic force microscope operating in vacuum and explained theoretically through numerical simulations of the equation of motion of the cantilever. Intrinsic electrostatic effects arising from electronic work-function difference of tip and surface are also highlighted. The findings are readily relevant for other opto-micromechanical systems where electrostatic force gradients can be implemented.
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Dates et versions

hal-03281598 , version 1 (08-07-2021)

Identifiants

Citer

A.A Barsella, M.A. A Hurier, M.D. D Pichois, Mircea Vomir, Habibul Hasan, et al.. Photonic Excitation of a Micromechanical Cantilever in Electrostatic Fields. Physical Review Letters, 2020, 125 (25), pp.254301. ⟨10.1103/PhysRevLett.125.254301⟩. ⟨hal-03281598⟩
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