183x Filetype PPT File size 1.37 MB Source: personal.ems.psu.edu
AFM - atomic force microscopy AFM - atomic force microscopy A 'new' view of structure (1986) A 'new' view of structure (1986) CD stamper CD stamper AlGaN/GaN quantum well waveguide AlGaN/GaN quantum well waveguide surface atoms on Si single crystal surface atoms on Si single crystal polymer growth See Vocabulary of Surface Crystallography, Journal of polymer growth Applied Physics 35, 1306 (1964), by Elizabeth A. Wood AFM - atomic force microscopy AFM - atomic force microscopy How does the microscope work? How does the microscope work? laser photodiode laser photodiode diode diode mirror mirror Tip scans sample Tip scans sample Up and down movement of tip recorded Up and down movement of tip recorded by position sensing photodiode by position sensing photodiode Si N Si N 3 4 3 4 tip tip sample sample AFM - atomic force microscopy AFM - atomic force microscopy How does the microscope work? How does the microscope work? laser photodiode laser photodiode diode diode mirror mirror Tip scans sample Tip scans sample Up and down movement of tip recorded Up and down movement of tip recorded by position sensing photodiode by position sensing photodiode Si N Si N 3 4 3 4 tip tip sample sample AFM - atomic force microscopy AFM - atomic force microscopy How does the microscope work? How does the microscope work? Two modes of operation Two modes of operation laser photodiode laser photodiode diode diode mirror mirror Si N Si N 3 4 3 4 tip tip sample sample AFM - atomic force microscopy AFM - atomic force microscopy How does the microscope work? How does the microscope work? Contact mode - short-range interactions (Å) - interatomic forces Contact mode - short-range interactions (Å) - interatomic forces Tip: 5-20 nm radius, 10-25 m high, on Tip: 5-20 nm radius, 10-25 m high, on 50-400 m cantilever beam 50-400 m cantilever beam
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