Photonic Excitation of a Micromechanical Cantilever in Electrostatic Fields.
Fiche publication
Date publication
décembre 2020
Journal
Physical review letters
Auteurs
Membres identifiés du Cancéropôle Est :
Dr GALLANI Jean-Louis
Tous les auteurs :
Barsella A, Hurier MA, Pichois MD, Vomir M, Hasan H, Mager L, Donnio B, Gallani JL, Rastei MV
Lien Pubmed
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 that 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 the electronic work-function difference of tip and surface are also highlighted. The findings are readily relevant for other optomicromechanical systems where electrostatic force gradients can be implemented.
Référence
Phys Rev Lett. 2020 Dec 18;125(25):254301