InSb-based tunable terahertz directional beaming device

A single-side InSb-dielectric surface grating structure has been proposed to realize active tunable terahertz directional beaming. In consideration of the magneto-optical property of InSb, the influences of applied magnetic field as well as environmental temperature on directional beaming characteristics of our proposed device have been numerically simulated. Simulation results indicate that the deflection angle increases with the increment of temperature while it tends to decrease as applied magnetic field intensity increases, therefore tunable directional beaming could be achieved within the terahertz frequency range. For the respective environmental temperature and applied magnetic field intensity of 220 K and 0.6 T, the deflection angle could reach 45.5 degrees at 0.65 THz. Moreover, under the same temperature and magnetic field, the deflection angles are different for the incident waves with different frequencies, which indicates that the proposed device could serve as an ideal THz beam splitter. (C) 2016 Elsevier B.V. All rights reserved.