Lens Electromagnetic

An electromagnetic lens is an important component of an electron microscope, designed to form and focus an electron beam.

By its design, the electromagnetic lens is a multilayer solenoid created from thin insulated copper wire wound around a cylindrical core. When electric current is passed through the windings of the lens, a magnetic field arises, which acts on the moving electrons of the beam, deflecting them and focusing them in the desired direction.

Thanks to the use of electromagnetic lenses, it is possible to effectively control the path of electrons in the microscope column, forming a thin probe beam and directing it to the sample under study. By adjusting the current in the windings, you can change the strength of the magnetic field of the lens and thus vary the focal length for optimal focusing of the beam. Electromagnetic lenses are a critical component that determines the resolution and image quality of an electron microscope.