Resonant Band Gaps from a Narrow Slit at Terahertz Frequencies

摘要

We report a simple sub-wavelength device for resonant band gaps generation at the terahertz (THz) frequencies. Employing the surface plasmon polaritons, only a single sub wavelength slit can cut out the THz spectrum effectively. The transmission spectrum of thus device is measured using the THz time domain spectroscopy system. With the slit becomes narrower, the transmission peaks move to the high frequency direction and the depth of the forbidden gap increase. Theoretical simulations are also carried out by using the the finite difference time domain method. The simulation results agree with experimental results well. This kind of devices can provide an approach to control the THz photons.