Ultrathin Perfect Light Absorbers

Abstract

The Salisbury Screen was the first method discovered for reducing the reflection of radio waves from a surface. Winfield Salisbury invented it in 1943. The patent was late nine years due to wartime security and finally published in 1952 particular. [1]. It was one of the first thoughts of radar-absorbent material known aggregately today as stealth technology, which is used to prevent the radar detection of aircraft in Salisbury Screens work on the same principle as optical antireflection coatings, often used to cover the surface of optical elements such as camera lenses to improve light transmission through and prevent light reflection from the surface. The most direct design of the Salisbury Screen involves of three layers: a metallic backplane, a dielectric of a precise thickness (typically a quarter of the wavelength of the absorbing radar wave), and a thin glossy dielectric screen.