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Calculated Gouy phase shifts of THz pulses radiated from sub-wavelength emission apertures. The Gouy phase shifts for three different-size apertures, (black), (red), and (blue) are plotted with (dashed line) of the one from a large-size aperture ().
(a) Layout and (b) schematic diagram of the transmissive sub-wavelength THz phase microscope. (c) Radiated THz pulses and (d) their amplitude spectra for InAs emission apertures of three different sizes; 200 (black), 100 (red), and 50 m (blue) from top to bottom. (e) The centroid time of radiated THz pulses measured with various size InAs emission apertures from 30 to 200 m (circle), and the calculated temporal advancement of THz pulses (dashed line).
(a) The microscope image of hexagram which consists of 30-, 50-, and 100-m diameter InAs emission apertures. (b) Measured THz intensity image and (c) THz temporal phase image with 60-m-diameter near-infrared pulses.
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