| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Photoexcited Blueshift and Redshift Switchable Metamaterial Absorber at Terahertz Frequencies |
| Zong-Cheng Xu1,2**, Liang Wu2, Ya-Ting Zhang2, De-Gang Xu2, Jian-Quan Yao2 |
1Department of Physics, Tianjin University Renai College, Tianjin 301636
2Institute of Laser and Opto-electronics and Key Laboratory of Opto-electronics Information Science and Technology (Ministry of Education), Tianjin University, Tianjin 300072
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| Cite this article: |
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Zong-Cheng Xu, Liang Wu, Ya-Ting Zhang et al 2019 Chin. Phys. Lett. 36 124202 |
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Abstract We propose a design and numerical study of an optically blueshift and redshift switchable metamaterial (MM) absorber in the terahertz regime. The MM absorber comprises a periodic array of metallic split-ring resonators (SRRs) with semiconductor silicon embedded in the gaps of MM resonators. The absorptive frequencies of the MM can be shifted by applying an external pump power. The simulation results show that, for photoconductivity of silicon ranging between 1 S/m and 4000 S/m, the resonance peak of the absorption spectra shifts to higher frequencies, from 0.67 THz to 1.63 THz, with a resonance tuning range of 59%. As the conductivity of silicon increases, the resonance frequencies of the MM absorber are continuously tuned from 1.60 THz to 1.16 THz, a redshift tuning range of 28%. As the conductivity increases above 30000 S/m, the resonance frequencies tend to be stable while the absorption peak has a merely tiny variation. The optical-tuned absorber has potential applications as a terahertz modulator or switch.
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Received: 19 July 2019
Published: 25 November 2019
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| PACS: |
42.25.Bs
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(Wave propagation, transmission and absorption)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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| Fund: Supported by the National Key Research and Development Program of China under Grant No. 2017YFA0700202. |
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