Electrochromic Attenuated Total Reflection Modulator
Original Publication Date: 1979-Oct-01
Included in the Prior Art Database: 2005-Feb-20
A voltage-driven light modulator (Fig. 1) includes a transpare nt prism 10 upon which a metal film 12 is deposited. The metal film is typically gold or silver and is of the order of 50 nm thick. A layer 14 of an electrochromic material, such as a semiconductor or an organic dye, fills the space (several micrometers thick) between the metal film 12 and a second metal film 16. A beam 18 of polarized light is passed through the prism 10 onto the metal film 12 and reflected from the sandwich structure. The angle of incidence inside the prism 10 and the thickness of the metal film 12 must be appropriate for the excitation of a surface plasma wave at the metal film 12 - electrochromic layer 14 interface.