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Separating different contributions to the shear force in near-field microscopy
M Leuschner1, M Schüttler, H Giessen
1Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften der Philipps-Universität, Renthof 5, D-35032 Marburg, Germany. mirko.leuschner@physik.uni-marburg.de
Journal of Microscopy
|April 12, 2001
Summary
This study details shear forces between surfaces and optical probes, distinguishing adiabatic and dissipative interactions. Findings reveal characteristic distance-dependent forces and temperature effects on gold samples.
Area of Science:
- Surface science
- Nanotechnology
- Atomic force microscopy
Background:
- Near-field optical probes are crucial for high-resolution surface analysis.
- Understanding tip-surface interactions is key to advancing nanoscale imaging and manipulation.
- Tuning fork detection offers a sensitive method for measuring forces.
Purpose of the Study:
- To investigate the shear force interactions between gold and graphite surfaces and a near-field optical probe.
- To differentiate between adiabatic and dissipative forces during tip-surface approach.
- To analyze the influence of distance and temperature on these forces.
Main Methods:
- Utilized a near-field optical probe with tuning fork detection.
- Monitored the amplitude and phase of tip vibration during approach to surfaces.
- Performed measurements at various temperatures using a gold sample.
Main Results:
- Clearly distinguished adiabatic and dissipative shear force contributions.
- Observed characteristic, distance-dependent variations in the relative strengths of these contributions.
- Found that graphite interaction initiates at larger distances compared to gold.
- Noted that the adiabatic contribution is greater for gold, while graphite exhibits predominantly dissipative interaction.
- Demonstrated a temperature dependence of shear force on the gold sample.
Conclusions:
- Shear force interactions are complex, with distinct adiabatic and dissipative components.
- The nature and distance dependence of these forces vary significantly between different materials (gold vs. graphite).
- Temperature plays a role in the shear force dynamics, particularly for metallic surfaces like gold.
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