Abstract
Metamaterial full-sized absorber structures are numerically and experimentally investigated in GHz region and then examined in THz frequency. By manipulating monitoring the number and the position of the defect elements in conventional unit cells, the optimal integrative absorber structures are generated. The proposed structures provide an ultra-broadband absorbance in the operating frequency. The good agreement between simulation, measurement and theoretical analysis is observed with a 5 GHz-bandwidth corresponding to the absorption of 95%. In particular, we extrapolate the concept to THz region and demonstrate that, the method can be applied to increase the bandwidth of the metamaterial absorber to 5 THz, while maintaining the other characteristics. This structure can be applied to improve the performance of telecommunication systems such as micro-antenna, micro-electromagnetic transmitters and apply to imaging and sensing fields.
Highlights
The first demonstration of metamaterial perfect absorber (MPA) were archetypically proposed by Landy et al in 200810
The broadband MPA is created by controlling the number of optimal unit cells and manipulating the defects’ location in the full-sized metamaterial absorber (FSMA)
This technique is extrapolated to the THz region for THz broadband MPA
Summary
Manh Cuong Tran[1], Dinh Hai Le2, Van Hai Pham[1], Hoang Tung Do3, Dac Tuyen Le4, Hong Luu Dang2 & Dinh Lam Vu2. The broadband MPA is created by controlling the number of optimal unit cells and manipulating the defects’ location in the full-sized metamaterial absorber (FSMA). This method is not popular yet is always applied in real technical devices because of their limited geometrical dimensions. The equivalent medium theory (EMT)[30] is applied to interpret the broadband absorption characteristics of the FSMA and provides a good agreement with the simulation This method can be employed for various metamaterial full-sized structures to obtain the ultra-broadband absorption in both GHz and THz regions. This technique may initiate a new way of studying broadband metamaterial perfect absorber
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