Design for AFM demonstration Kevin D. McCarthy 9/28/05

What is AFM and why is it so clever?

Atomic force microscope photodetector laser k 0.1 N/m AFM: Atomic Force Microscope

Atomic force microscope, deflected photodetector laser k 0.1 N/m AFM: Atomic Force Microscope

Feedback loop z How it traces surface…

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

AFM: Atomic Force Microscope x V piezo

photodetector laser k 0.1 N/m Optical levers sensitivity means nN forces can be controllably exerted…

Design for class-room scale demo of AFM imaging mechanism… Z axis motion… Laser pointer mirror photo-detector screen Wheeled assembly can be rolled over books or other ~1 inch obstacles, while operator tries to maintain dot position on photo-detector screen. An assistant can be continuously recording (strip-chart style) the z piezo reading vs. x (horizontal position)