To enhance the modulation of the terahertz wave in graphene based modulators, the hollow metallic structures are proposed in our works. With the field localization and enhancement raised by the resonant of the hollow metallic structures, the interaction between the graphene and the terahertz wave is enhanced. It leads to the modulation enhanced when the conductance of graphene is tuned by applied voltage. The samples with hollow square ring array structure and hollow H-cross array structure is discussed with simulations and experiments. The results indicate that the maximum modulation enhancement is achieved near the resonant frequencies.
The fabrication method of hard template substrate supporting in the lithography process is proposed to realize THz devices based on low loss polymer substrate with large effective area. Based on this method, the THz polarizer with single layered and double layered grating structure are fabricated and measured. The transmission spectra indicates that the loss of the polarizer is low and the polarization extinction ratio is as high as 55dB and 70dB for single and double layered samples respectively. The THz band stop filter result indicates that the loss keeps low and the filter band width is wider for the multi-layered metallic structure.
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