Dynamical switching of electromagnetically induced reflectance in complementary terahertz metamaterials

He, Xiaodong; Wang, Yue; Tao, Mengning; Yu, Xuzheng; Pei, Zhen; Wang, Benhua; Yang, Yuqiang; Jiang, Jiuxing; Zhang, Geng

doi:10.1016/j.optcom.2019.04.086

Cited by 16 publications

(6 citation statements)

References 22 publications

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“…The real part χ r and imaginary part χ i of the susceptibility χ are related to the dispersion and the energy dissipation of the EIR system, respectively. Therefore, the reflection of the EIR metamaterial can be described as R = 1 − gχ i , where g is the geometric parameter that represents the coupling strength between the incident terahertz electric field E and the bright mode of the EIR metamaterial [36]. Subsequently, figure 4 shows the systematic tuning of the EIR metamaterial by gradually introducing the structural asymmetry.…”

Section: Resultsmentioning

confidence: 99%

3D-printed terahertz metamaterial for electromagnetically induced reflection analogue

Li¹,

Shen²,

Yin³

et al. 2022

J. Phys. D: Appl. Phys.

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The electromagnetically induced transparency (EIT) phenomenon in the metamaterials has been extensively investigated and applied in light storage, slow-light devices, and nonlinear devices. Most studies on the EIT-like phenomenon have been focused on the transmissive devices instead of reflective devices. Here we have proposed a 3D reflective metamaterial composed of two horizontal bars and a vertical bar to unfold the EIT-like effect in the terahertz frequency. Both computational simulation and theoretical analysis demonstrate that the coupling between the bright and dark mode starts when the structure symmetry is broken by the offset of the vertical bar, giving rise to a transparency window in the reflection spectra. The EIT-like phenomenon can also be tailored by the lateral displacement of the vertical bar. By combining the projection micro-stereolithography 3D printing and electron beam evaporation coating technology, two illustrative metamaterials are manufactured to characterize the EIT phenomenon. The reflection spectra measured by THz-TDS agree well with the theoretical results and validate the 3D design mechanism of reflective EIT-like devices. Our results unveil a practical and facile approach to designing and fabricating reflective EIT-like metamaterials and shed light on its potential application in multifunctional terahertz devices.

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Section: Resultsmentioning

confidence: 99%

3D-printed terahertz metamaterial for electromagnetically induced reflection analogue

Li¹,

Shen²,

Yin³

et al. 2022

J. Phys. D: Appl. Phys.

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“…In Equation ( 8) χ r represents the dispersion. The transmittance T can be calculated by the formula T = 1 − λ 0 χ i , where χ i is proportional to the energy loss [17,36].…”

Section: Resultsmentioning

confidence: 99%

“…The tuning can be realized by changing structural parameters, using tunable materials and microelectromechanical systems (MEMS) technology. Due to the high flexibility, tunable materials-based PIT devices have become a research hotspot [17][18][19][20][21][22][23][24]. Graphene is especially widely used in the design of tunable PIT devices because of its high electron mobility, high modulation depth, tunable surface conductivity and low insertion loss characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dual-Spectral Plasmon-Induced Transparent Terahertz Metamaterial with Independently Tunable Amplitude and Frequency

Wang

Jia

et al. 2021

Nanomaterials

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A bifunctional tunable metamaterial composed of pattern metal structure, graphene, and strontium titanate (STO) film is proposed and studied numerically and theoretically. The dual plasmon-induced transparency (PIT) window is obtained by coupling the bright state cut wire (CW) and two pairs of dark state dual symmetric semiring resonators (DSSRs) with different parameters. Correspondingly, slow light effect can also be realized. When shifting independently, the Fermi level of the graphene strips, the amplitudes of the two PIT transparency windows and slow light effect can be tuned, respectively. In addition, when independently tuning the temperature of the metamaterial, the frequency of the dual PIT windows and slow light effect can be tuned. The physical mechanism of the dual-PIT was analyzed theoretically by using a three-harmonic oscillator model. The results show that the regulation function of the PIT peak results from the change of the oscillation damping at the dark state DSSRs by tuning conductivity of graphene. Our design presents a new structure to realize the bifunctional optical switch and slow light.

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“…As a similar phenomenon of EIT, the EIR effect refers to that a reflection peak appears at the position of a wider reflection spectrum 22 , 23 . The EIR effect in metamaterials can also be applied to devices such as sensing, optical switches and slow light 24 – 26 Moreover, the appearance of EIR effects can supplement the applications in the reflection space, while cannot be achieved based on the EIT effects in the transmission space.…”

Section: Introductionmentioning

confidence: 99%

“…22,23 The EIR effect in metamaterials can also be applied to devices such as sensing, optical switches and slow light. [24][25][26] Moreover, the appearance of EIR effects can supplement the applications in the reflection space, while cannot be achieved based on the EIT effects in the transmission space. Nevertheless, most of metamaterial structures reported so far only have single EIT effect or EIR effect, there are few designs that support both effects in terahertz (THz) band and achieve tuning characteristics.…”

Section: Introductionmentioning

confidence: 99%

Tunable terahertz metamaterial based on vanadium dioxide for electromagnetically induced transparency and reflection

et al. 2023

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To realize the electromagnetically induced transparency (EIT) or reflection (EIR) effect in the terahertz band, many metamaterial structures have been proposed. However, these structures usually have a single function of EIT effect or EIR effect, and it is a major challenge for a metamaterial structure to perform multiple functions. In this study, a switchable multifunctional hybrid metamaterial is proposed, which realizes the combined function of tunable EIT effect and EIR effect at THz regions through the integration of vanadium dioxide (VO 2 ) and metal metamaterial. Moreover, by changing the conductivity of VO 2 , the intensity modulations of EIT window and EIR window reach 36.11% and 50.59%, respectively. The surface current distribution and electric field responses are used to analyze the physical mechanisms of the EIT effect and the EIR effect. In addition, the active tuning mechanism of the metamaterial is theoretically explored based on the "two-particle" model. The designed hybrid metamaterial provides a simple approach to realize tunable EIT effect and EIR effect in THz metamaterials. This work opens up a possible way to achieve switchable functions (EIT or EIR) in a single device, which may find potential applications in optical switches, sensing, filtering, and slow light devices.

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Dynamical switching of electromagnetically induced reflectance in complementary terahertz metamaterials

Cited by 16 publications

References 22 publications

3D-printed terahertz metamaterial for electromagnetically induced reflection analogue

3D-printed terahertz metamaterial for electromagnetically induced reflection analogue

Dual-Spectral Plasmon-Induced Transparent Terahertz Metamaterial with Independently Tunable Amplitude and Frequency

Tunable terahertz metamaterial based on vanadium dioxide for electromagnetically induced transparency and reflection

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