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Diagram of the filter’s construction, comprised of two identical gold-coated microfabricated silicon plates (shown not to scale and cut away for clarity). The rod dimensions are width , depth , and period . Tuning is achieved by a relative lateral shift of the plates in a direction parallel to the inner grids’ grating vector .
Schematic layout of the terahertz measurement setup. A femtosecond laser (not shown) with provides 120 fs pulses to both the emitter and detector (fabricated on LT InGaAs). Silicon lenses couple radiation to/from the antenna while the filter is placed at the focus of two parabolic mirrors.
Plot of the measured transmission coefficient of the filter for two tuning positions The inset shows the tuning of the pass-band peak and −3 dB points for all 12 measured tuning positions.
Plot of the simulated transmission coefficient of the filter for the same two tuning positions as in Fig. 3. The inset shows the tuning of the pass-band peak and −3 dB points for all 12 simulated tuning positions.
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