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We compare two methods of wavefront analysis of THz pulses associated with a 2D electro-optic imaging system. The first one is the standard Hartmann sensor, and the second one is based on the well-known fact that EO sampling can record the phase variation of the THz electric field.
Surface wave provides unique applications ranging from biological sensing, deep-subwavelength lasing to plasmonic circuits. Seeking new approaches for controlling surface wave is highly desired in future integrated photonic devices. Here, we develop a versatile platform based on metasurfaces for the launch and control of propagating surface wave in the terahertz frequency regime.
We performed time-resolved terahertz (THz) near-field imaging of the perfect electric conductor (PEC) disk with sub-wavelength periodic grooves. The results strongly indicate the quadrupole spoof localized surface plasmon (LSP) is excited by vortex beam excitation. Our results pave the way for plasmonic applications in the THz frequency region.
We experimentally and theoretically investigate the Gouy phase shift of the longitudinal terahertz (THz) wave in the entire focal region. By comparing the pulses shape and orientation before and after the focus, we find that the complete Gouy shift for the longitudinal field components is same to that of the transverse field components, with the value of π. The only different between them is their...
THz microscopic imaging is used to extract the Gouy phase shift of the transverse and longitudinal field components of a tightly focused, radially polarized beam. We demonstrate that the applied THz time domain approach allows to observe directly the evolution of the geometric phase as the wave propagates through the focus. Our method yields a Gouy phase shift of 2π for the transverse component and...
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