In nanotechnology, feedback control typically involves the following components:
1. Sensor: Measures the system's current state. 2. Controller: Compares the measured state with the desired state. 3. Actuator: Makes adjustments to bring the system closer to the desired state.
For example, in a scanning tunneling microscope (STM), the feedback control system adjusts the tip's position to maintain a constant tunneling current, enabling high-resolution imaging of surfaces at the atomic level.
