Characteristics of the Beam-Steerable Difference-Frequency Generation of Terahertz Radiation
We have investigated the characteristics of a terahertz (THz) beam steering method based on a combination of difference-frequency generation (DFG) with the principle of the phased array antenna. In the DFG of THz radiation from a nonlinear optical crystal pumped by optical beams, the phase front of the THz radiation is indirectly tilted by adjusting the relative incidence angle between the pump beams to the crystal. A magnification of the steering angle with a factor of 193 is demonstrated as the most important effect provided by the method. The effect allows the use of a high-speed optical deflector for adjusting the incidence angle, accelerating the steering more than a hundred times compared with mechanical methods. The phase mismatching between the THz radiation and the pump beams as well as the refraction at the crystal surface limit the steering angle of the THz radiation to 56°, full width at half maximum.
KeywordsBeam steering Difference-frequency generation Phased array antenna Phase matching
- 3.Martin Koch, “ Terahertz Communications: A 2020 vision,” Terahertz Frequency Detection and Identification of Materials and Objects, R. E. Miles et al. (eds.), Springer Netherlands, 325–338 (2007)Google Scholar
- 4.D. M. Britz, “Evolution of extreme bandwidth personal and local area terahertz wireless networks,” Extended abstracts of 2nd international workshop on terahertz technology (TeraTech’09), 113–120 (2009)Google Scholar
- 14.R. J. Mailloux, Phased array antenna handbook (Artech house, 2005), Chap. 1.Google Scholar