Материал из Department of Theoretical and Applied Mechanics
A Brief History and Simple Description of NSOM/SNOM Technology
SOM (SNOM) Overview
The limits of far field imaging
In the early 1870s, Ernst Abbe formulated a rigorous criterion for being able to resolve two objects in a light microscope: d > λ / (2sinθ)
where d = the distance between the two objects, λ = the wavelength of the incident light, and 2θ = the angle through which the light is collected.According to this equation, the best resolution achievable with optical light is about 200 nm. With the introduction of NSOM (near-field scanning optical microscopy, also known as SNOM, scanning near-field optical microscopy), this limitation no longer exists, and optical resolution of < 50 nm can be achieved.