Numerical simulations of terahertz double-negative metamaterial with isotropic-like fishnet structure

Ding, Pei; Liang, Erjun; Hu, Weiyan; Zhang, L.; Zhou, Qingjia; Xue, Qianzhong

doi:10.1016/j.photonics.2008.12.005

Cited by 36 publications

(30 citation statements)

References 31 publications

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“…The central layer consists of the well known fishnet structure [3,7], and a representation of the unit cell with all the geometrical parameters is shown in Fig. 1(a).…”

Section: Design Of Individual Layersmentioning

confidence: 99%

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Reconfigurable Fishnet Metamaterial Using Pneumatic Actuation

Khodasevych¹,

Rowe²,

Mitchell³

2012

PIER B

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Abstract-The design, fabrication and measurement of a reconfigurable fishnet metamaterial based on a new method of tuning by changing unit cell geometry is reported. Retractable elements are added to the unit cell utilizing pneumatically actuated switching. It is shown that the pneumatic actuation approach can unite a number of metallic elements into a complex conducting structure. Experimental demonstration confirms that the structure operates at two different frequencies in the GHz range in distinct actuation states. The measured results also show good agreement with numerical simulations.

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“…The central layer consists of the well known fishnet structure [3,7], and a representation of the unit cell with all the geometrical parameters is shown in Fig. 1(a).…”

Section: Design Of Individual Layersmentioning

confidence: 99%

“…Alternatively, previous theoretical investigations have shown that changing the geometry of the metallic elements resulted in more substantial shift in the resonant frequency of the structure [7,8]. The challenge of this approach is the permanent nature of metallic patterns on the substrate after fabrication is completed.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable Fishnet Metamaterial Using Pneumatic Actuation

Khodasevych¹,

Rowe²,

Mitchell³

2012

PIER B

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“…The uniqueness of the designed TFMM is the use of polymer dispersed liquid crystals (PDLC) [20] and a process developed to seal the liquid crystals in the PDLC so that device does not require a confined liquid crystal cell. With a large dielectric constant change in the PDLC, TFMM can achieve a large ∆n.…”

Section: Motivationmentioning

confidence: 99%

“…For example, the refractive index of fishnet metamaterial can be changed from 0.7 to -1.5 when the incident wavelength varies from 1200nm to 1760nm [19]. Also, when the incident wave is operated at 0.8THz and the dimension of fishnet pattern is modified, the ideal ∆n can reach as high as 5 [20]. …”

Section: Introductionmentioning

confidence: 99%

“…Thus, SRR was the first 'true' metamaterial. All other metamaterials such as fishnet and staple-like metamaterials [20,32] are based on the concept of SRR metamaterial. showing that real part of permeability of SRR is negative near the resonant frequency region while imaginary part of permeability is positive because the material is lossy.…”

Section: Introduction To Metamaterialsmentioning

confidence: 99%

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Tunable terahertz fishnet metamaterial

Chang¹,

Wang²,

Lin³

et al. 2013

Applied Physics Letters

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A tunable fishnet metamaterial (TFMM) was designed and fabricated to prove its potential in controlling terahertz radiation (0.1 THz~10THz). A model to retrieve refractive index of single layer fishnet metamaterial (SLFM) was developed and applied to study the tunable frequency range of TFMM. Reference planes that define the material boundaries of SLFM and multilayer fishnet metamaterial (MLFM) were investigated to show that the material property of fishnet metamaterial is a function of layers. The issue of applying current model to MLFM was discussed.The TFMM infiltrated with a voltage-controllable polymer dispersed liquid crystal (PDLC) was fabricated and tested by terahertz time domain spectroscopy (THz-TDS). An encapsulating technique that covers PDLC with a polyimide layer (skin layer) was applied to prevent volatile liquid crystal from escaping the PDLC and enable the deposition of metal layer. Concept of tuning TFMM infiltrated with PDLC (PDLC-TFMM) was proven by measuring the frequency shift in the reflection coefficient. The negative refractive index of PDLC-TFMM was achieved. The reliability issue of current PDLC-TFMM was discussed.II

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