Colour selective control of terahertz radiation using two-dimensional hybrid organic inorganic lead-trihalide perovskites.

ABSTRACT: Controlling and modulating terahertz signals is of fundamental importance to allow systems level applications. We demonstrate an innovative approach for controlling the propagation properties of terahertz (THz) radiation, through use of both the excitation optical wavelength (colour) and intensity. We accomplish this using two-dimensional (2D) layered hybrid trihalide perovskites that are deposited onto silicon substrates. The absorption properties of these materials in the visible range can be tuned by changing the number of inorganic atomic layers in between the organic cation layers. Optical absorption in 2D perovskites occurs over a broad spectral range above the bandgap, resulting in free carrier generation, as well as over a narrow spectral range near the bandedge due to exciton form

SUBMITTER: Chanana A 

PROVIDER: S-EPMC5673065 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature