THz transmission through cross metallic fractal slits by FDTD simulation
2011
The transmission spectra of sub-wavelength cross metallic fractal slits in terahertz (THz) frequency region are
presented by means of finite-difference-time-domain (FDTD) simulation. The transmission spectra with multiple pass
bands and stop bands are observed. To understand the physical mechanism of the enhanced transmissions, we simulated
the electric field distribution of THz radiation within the metallic slits at the resonance frequencies by the
electromagnetic design software named CONCERTO. Further analysis reveals that the two transmission peaks in the low
frequency is the local resonance of electric field of the two cross slit, respectively. The third transmission peak is the
co-effect of the two level cross slits. Our simulation is helpful for the understanding of THz wave propagation and THz
transmission through the cross metallic fractal structures. It is also useful for the development of THz photonic devices.
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