Abak, M. K.Aktas, O.Mammadov R.Gürsel, I.Dâna, A.2016-02-082016-02-0820080003-6951http://hdl.handle.net/11693/23089We report use of nonlinear tip-sample interactions to parametrically convert the frequency components of periodic tip-sample interaction forces to frequencies where they can be resonantly detected. One flexural mode of a cantilever is used for tapping-mode imaging and another flexural mode is used for detection of forces converted in presence of an externally injected mechanical oscillation at the difference frequency of the detecting mode and a harmonic of the tapping mode. Material contrast in attractive and repulsive regimes are demonstrated on samples with polymethyl methacrylate patterns and with deoxyribonucleic acid strands on silicon. © 2008 American Institute of Physics.EnglishFlow interactionsOrganic acidsPhotoresistsSilicon(100) siliconAmerican Institute of Physics (AIP)Deoxyribonucleic acid (DNA)Difference frequencyFlexural modesFrequency componentsMechanical oscillationsmethacrylate (APMA)Tapping mode (TM)Tip sample interactionsReusabilityArticle10.1063/1.2940304