Lapshin, D. A.Letokhov, V. S.Shubeita, G. T.Sekatskii, S. K.Dietler, G.2007-06-202007-06-202007-06-20200410.1016/j.ultramic.2004.01.003https://infoscience.epfl.ch/handle/20.500.14299/9107WOS:000221914700003Shear force distance control in a scanning near-field optical microscope: in resonance excitation of the fiber probe versus out of resonance excitationtext::journal::journal article::research article