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Friday, June 10, 2016
Abstract-Abruptly autofocusing terahertz waves with meta-hologram
Abruptly autofocusing terahertz waves with meta-hologram
ingwen He, Sen Wang, Zhenwei Xie, Jiasheng Ye, Xinke Wang, Qiang Kan, and Yan Zhang
An abruptly autofocusing ring-Airy beam is demonstrated in the terahertz (THz) waveband with a meta-hologram. The designed meta-hologram is composed of gold C-shaped slot antennas, which can realize both phase and amplitude modulation of the incident THz wave. A THz holographic imaging system is utilized to measure the generated ring-Airy beam; an abrupt focus following a parabolic trajectory is subsequently observed. THz ring-Airy beams with different parameters are also generated and investigated. This method can be expanded to other wavebands, such as the visible band, for which the meta-hologram can replace traditional computer-generated holography to avoid undesirable multiple diffraction orders.