Abstract-Nanoparticles doped film sensing based on terahertz metamaterials

Weimin Liu, . Author links open the author workspace.Fei Fan, . Author links open the author workspace.Shengjiang Chang, Jiaqing Hou, . Author links open the author workspace.Meng Chen, . Author links open the author workspace.Xianghui  Wang, Jinjun Bai, 

http://www.sciencedirect.com/science/article/pii/S0030401817306739?via%3Dihub


. Author links open the author workspace.FeiFan
A nanoparticles concentration sensor based on doped film and terahertz (THz) metamaterial has been proposed. By coating the nanoparticles doped polyvinyl alcohol (PVA) film on the surface of THz metamaterial, the effects of nanoparticle concentration on the metamaterial resonances are investigated through experiments and numerical simulations. Results show that resonant frequency of the metamaterial linearly decreases with the increment of doping concentration. Furthermore, numerical simulations illustrate that the redshift of resonance results from the changes of refractive index of the doped film. The concentration sensitivity of this sensor is 3.12 GHz/0.1%, and the refractive index sensitivity reaches 53.33 GHz/RIU. This work provides a non-contact, nondestructive and sensitive method for the detection of nanoparticles concentration and brings out a new application on THz film metamaterial sensing.

Abstract-Terahertz polarization splitter based on orthogonal microstructure dual-core photonic crystal fiber

Shanshan Li, Hao Zhang, Yu Hou, Jinjun Bai, Weiwei Liu, andShengjiang Chang  »View Author Affiliations

A broadband polarization splitter operating in the terahertz (THz) band is proposed based on dual-core photonic crystal fiber with orthogonal microstructure in the core regions. The Index Converse Matching Coupling method is presented to design the THz polarization splitter for the first time, which exhibits several advantages, such as short splitting length, high extinction ratio, low loss, and broad operation bandwidth. By numerical simulation, it has been found that the strong coupling occurs within a frequency range of 0.4–0.7 THz. The operation bandwidth is more than 0.15 THz (equal to 138 μm). The shortest splitting length is only 1.83 cm at 0.4 THz. The extinction ratios for both of x and y polarization are better than −15  dB when the frequency is larger than 0.51 THz. The lowest material absorption loss is only 0.34 dB at 0.4 THz. Moreover, this structure is simple to design and easy to fabricate over its counterparts in the communication band. Our research offers an effective method to design a broadband THz device and would be of significance for future relevant applications

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