Polarization-dependent focusing of terahertz surface plasmon polaritons

Sen Wang; Xinke Wang; Yan Zhang

doi:10.1117/12.2214415

5 November 2015 Polarization-dependent focusing of terahertz surface plasmon polaritons

Sen Wang, Xinke Wang, Yan Zhang

Proceedings Volume 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015; 97953K (2015) https://doi.org/10.1117/12.2214415
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held June-July 2015, 2015, Hefei, Suzhou, and Harbin, China

Abstract

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.

Citation Download Citation

Sen Wang, Xinke Wang, and Yan Zhang "Polarization-dependent focusing of terahertz surface plasmon polaritons", Proc. SPIE 9795, Selected Papers of the Photoelectronic Technology Committee Conferences held June–July 2015, 97953K (5 November 2015); https://doi.org/10.1117/12.2214415

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