Sunday, November 8, 2015

Abstract-Polarization-dependent focusing of terahertz surface plasmon polaritons

Sen WangYan Zhang
Harbin Institute of Technology (China)
Xinke Wang
Capital Normal Univ. (China)
Proc. SPIE 9795, Selected Proceedings of the Photoelectronic Technology Committee Conferences held June and July 2015, 97953K (November 5, 2015); doi:10.1117/12.2214415

Focusing of terahertz (THz) surface plasmon polaritons (SPPs) excited by linearly and circularly polarized THz radiation is investigated experimentally and theoretically. A high-speed THz-SPPs imaging system is built up to measure both the amplitude and phase of the excited THz-SPPs. For the horizontally polarized THz radiation, the THz-SPPs will be focused in the centre of the semicircular slit and the phase images reveals a π/2 Gouy phase shift though the focal spot of THz-SPPs. With the illumination of vertically polarized THz radiation, the focal spot in the centre will split into two focal spots in the y-direction. For the circularly polarized incident THz radiation, the focal spot of THz-SPPs will shift upward or downward in the y-direction. FDTD simulations are performed and compared with the experimental results. A good agreement between experimental results and simulation results can be found.

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