Journal: Beilstein Journal of Nanotechnology

Article Title: High-frequency multimodal atomic force microscopy

doi: 10.3762/bjnano.5.255

Figure Lengend Snippet: Cantilever drive and deflection readout characterization. a) In contrast to piezo excitation (top curves), photothermal excitation (lower curves) cleanly and consistently drives the first two resonances for more than 100 min. b) The photothermal tunes show resonances up to 19.5 MHz, demonstrating the wide bandwidth with clean phase responses for selected modes. By offsetting the drive laser laterally on a triangular cantilever (Bruker FastScan C), torsional resonances can be excited (red curve). Visible are the first three flexural modes ( f 0 , f 1 and f 2 ), the first two torsional modes ( t 1 and t 2 ), and a complex higher resonant mode (hm). c) Thermal noise peak of the first flexural mode of a FastScan A cantilever, with a baseline noise floor of 45 fm/ . d) Thermal noise peak of the second flexural mode of a FastScan A at 6.6 MHz.

Article Snippet: We confirmed our identification of the resonant modes by using a finite element model of the cantilever (Comsol 4.3b, Comsol, Inc., Burlington, MA, USA).

Techniques: