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Diagram of TPPWG and slit sample.
(a) Reference [black line (big pulse), without slits] and output [red line (small pulse), with slits] THz pulses for a air gap. (b) Normalized amplitude spectra of the reference and output. (c) Comparison of power transmission spectrum between measurement (dots) and FDTD simulation (solid line). (d)–(f) are the same as (a)–(c) but for a air gap.
Comparison of power transmission for normalized time-averaged E field intensity according to the number of slits. The position of the measured average E field intensity is between slits (on the metal surface).
FDTD simulation with a air gap. The left-hand figures illustrate the B stop-band frequency (1.54 THz), and the left arrowhead indicates THz beam entry to the air gaps: (a) E field intensity distribution; (b) Poynting vectors around the first slit (black and red arrows indicate radian phase difference); (c) Ey field distribution. The right-hand figures illustrate the C stop-band frequency (2.24 THz); (d) E field intensity distribution; (e) Poynting vectors around the third slit; (f) Ey field distribution.
3D THz absorbance graph for Bragg (A1 and A2) and non-Bragg (B and C) stop bands with different air gaps.
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