optical microscopy (ANSOM), also known as scattering-type scanning near-field optical microscopy (s-SNOM), achieves super-resolution imaging through the local enhancement of the optical field near a sharp tip, often made of metal. In ANSOM, a metallic or dielectric probe interacts with incident light, creating a confined and enhanced electromagnetic field at the apex of the tip due to localized surface plasmon resonance.

Optical nano-antennas