A novel invisible media based on transformation optics consisting of three regions to investigate invisibility was proposed here. What the media does is to compress the light to a small region so that the light can avoid interacting with objects, and then it would be recovered in the latter. Comparing with the traditional cylinder cloak, which require the light propagating around the concealed region, the media would help us to avoid singularity of material parameters. Finite element simulations for two-dimensional cases have been performed to prove these ideas.
This paper puts forward a newer sensor which is symmetrical two rectangular resonant cavities based on parallel-plate
waveguide, using the lowest-order transverse-electric mode in terahertz region . From the simulation result we found when
we place the material in one of the resonant cavity, the original symmetric state has changed, not only a new resonance peak
appear ,but it also every resonant peak has obvious relative frequency shift with different material. So the structure can be used
as the sensor, which can detect the material.
A metal hole arrays terahertz filter based on surface plasmon polaritons and fabricated by aluminum slab of different holes scales have been experimentally investigated by using THz time-domain spectroscopy system from 0.1 to 2.7 THz. The experiment results indicated there is a transmission peak at 0.26 THz, approximately. The results in simulation by finite element method agree well with the experimental one for the big scale sample. The mismatch of experimental and simulated results for small scale sample can be attributed to boundary condition and insufficient periodical extension. Further, the theoretical analyses about extraordinary optical transmission and filter phenomena are also discussed.
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