A Tunable Polarization-Dependent Terahertz Metamaterial Absorber Based on Liquid Crystal

Deng, Guangsheng; Lu, Yujiao; Yin, Zhiping; Lai, Weien; Lu, Hongbo; Yang, Jun; Yang, Anli; Yang, Yuchen; Liu, Dayong; Chi, Baihong

doi:10.3390/electronics7030027

Cited by 12 publications

(8 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By adjusting the external electric field, the relative permittivity of LC can be continuous controlled and resonant frequency of unit cells simultaneous changed. Many electrically tuned devices based on LC technology have been reported, such as phase shifters [18,19], absorbers [20,21], and filters [22][23][24]. As shown in Figure 1a, the proposed three-dimensional phase shifter.…”

Section: Design and Simulationmentioning

confidence: 99%

Tunable Liquid Crystal Based Phase Shifter with a Slot Unit Cell for Reconfigurable Reflectarrays in F-Band

et al. 2018

Self Cite

View full text Add to dashboard Cite

An electrically tuned phase shifter based on the single slot unit cell and liquid crystal for a reconfigurable reflectarray antenna was presented. The simulation and measured results obtained at the F-band were used to demonstrate that the dielectric properties of a nematic state liquid crystal could be exploited to realize a slot unit cell phase shifter for the reconfigurable reflectarrays antennas. By reducing the inhomogeneous of the external electric field in the liquid crystal layer, a lower control voltage and improved model accuracy was obtained. In the experiments test, the achieved saturation bias voltage (10 V) was smaller than the previously reported structure, and the phase shift of the reflectarray greater than 300° was achieved in the frequency range 121.5–126 GHz. The maximum phase shift of 306° occurred at 124.5 GHz.

show abstract

Section: Design and Simulationmentioning

confidence: 99%

Tunable Liquid Crystal Based Phase Shifter with a Slot Unit Cell for Reconfigurable Reflectarrays in F-Band

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the majority of existing metamaterial absorbers in the near-infrared are either polarization independent or only sensitive to one direction [13,14]. This limits their practical applications, such as in infrared imaging [15], spectral detection [16], and polarization multiplexing [17]. Hence, high absorption peaks in two orthogonal directions are very useful and desired.…”

Section: Introductionmentioning

confidence: 99%

A polarization-dependent near-infrared metamaterial absorber based on the hybrid halide perovskite in two orthogonal directions

Lei

Ren

Ou-Yang

et al. 2023

J. Opt.

View full text Add to dashboard Cite

A wide-angle and polarization-sensitive metamaterial absorber is highly desired for near-infrared optical applications, such as stealth coatings, photovoltaic materials, and detectors. Although current near-infrared metamaterial absorbers achieve high absorption rates, they are typically either polarization-independent or only sensitive to one direction. Herein, a (CH3NH3)PbBr3-based perfect absorber with high absorption in both orthogonal directions and polarization sensitivity has been designed. The maximum absorption in the TM-polarized light (perpendicular to the grating) exceeds 99.6% at 800-1000 nm. The maximum absorption in the TE-polarized light (parallel to the grating) exceeds 98.9% at 1500-1800 nm, and the peak absorption is more than 84.3% at 1800-2200 nm using finite-difference time-domain (FDTD) methods. By modifying various structural parameters, the absorption of the absorber could be separately shifted in a wide wavelength region. In addition, the designed absorber maintains good performance at large angles of incidence. This structure can be applied to other hybrid perovskite materials by simply changing the structural parameters. These results present a huge potential for applications based on metamaterial absorbers, such as infrared polarization imaging, selective spectral detection, near-infrared sensing, and polarization multiplexing.

show abstract

“…Metamaterials have attracted much attention due to their unusual electromagnetic resonance [1][2][3][4][5][6][7]. The resonance frequencies of metamaterials are sensitive to their geometrical structures [1][2][3] and the refractive indices of the media that surround the metamaterials [4][5][6][7]. Therefore, metamaterials can be used to develop frequency filters, intensity modulators, and sensors.…”

Section: Introductionmentioning

confidence: 99%

Passively Tunable Terahertz Filters Using Liquid Crystal Cells Coated with Metamaterials

Chiang

Chen

et al. 2021

Coatings

View full text Add to dashboard Cite

Liquid crystal (LC) cells that are coated with metamaterials are fabricated in this work. The LC directors in the cells are aligned by rubbed polyimide layers, and make angles θ of 0°, 45°, and 90° with respect to the gaps of the split-ring resonators (SRRs) of the metamaterials. Experimental results display that the resonance frequencies of the metamaterials in these cells increase with an increase in θ, and the cells have a maximum frequency shifting region of 18 GHz. Simulated results reveal that the increase in the resonance frequencies arises from the birefringence of the LC, and the LC has a birefringence of 0.15 in the terahertz region. The resonance frequencies of the metamaterials are shifted by the rubbing directions of the polyimide layers, so the LC cells coated with the metamaterials are passively tunable terahertz filters. The passively tunable terahertz filters exhibit promising applications on terahertz communication, terahertz sensing, and terahertz imaging.

show abstract

A Tunable Polarization-Dependent Terahertz Metamaterial Absorber Based on Liquid Crystal

Cited by 12 publications

References 26 publications

Tunable Liquid Crystal Based Phase Shifter with a Slot Unit Cell for Reconfigurable Reflectarrays in F-Band

Tunable Liquid Crystal Based Phase Shifter with a Slot Unit Cell for Reconfigurable Reflectarrays in F-Band

A polarization-dependent near-infrared metamaterial absorber based on the hybrid halide perovskite in two orthogonal directions

Passively Tunable Terahertz Filters Using Liquid Crystal Cells Coated with Metamaterials

Contact Info

Product

Resources

About