Applied Physics Letters · 1998 · 67 citations · 10 references
EngineeringMechanical EngineeringNanomaterialsNanotechnologySensorsForce SensingForce SensorsNanomechanicsOptical InstrumentsScanning Probe MicroscopyTactile SensingExcitationNear-field Optical MicroscopyNear-field Scanning Optical MicroscopyScanning Near-field Optical MicroscopyShear Force MeasurementShear Force SensingTip - Sample InteractionsTip-sample Interactions
A tapping-mode tuning fork force-sensing method for near-field scanning optical microscope is reported. Use of the tapping-mode tuning fork with mechanically asymmetric excitation generates better stability and sensitivity than in the shear force mode. Comparison of force curves for the two methods demonstrate that the tapping-mode tuning fork method provides a simpler and more sensitive method for near-field measurements. The method is demonstrated by imaging a sample consisting of 500 nm standard polystyrene spheres on silica in both air and water.
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Tapping mode atomic force microscopy in liquids
Paul K. Hansma, J. P. Cleveland, Manfred Radmacher et al. · Applied Physics Letters · 1994 · 868 citations