Penta-band terahertz light absorber using five localized resonance responses of three patterned resonators

Wang, Ben‐Xin; He, Yongfeng; Lou, Pengcheng; Huang, Wei‐Qing; Pi, Fuwei

doi:10.1016/j.rinp.2020.102930

Cited by 75 publications

(22 citation statements)

References 45 publications

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“…As a novel tool for controlling and manipulating electromagnetic waves, THz metamaterials, the artificial structures with periodic sub-wavelength patterns in the micrometer scale, can significantly improve light-matter interactions and show significant advantages in THz sensing and detection. The metamaterial-based THz absorber, especially the absorber with multiple frequency selectivity [11][12][13] or extremely narrow bandwidth [14], is one of the most notable devices in THz sensing and detection, which is typically configured with three layers, namely a metamaterial layer, a dielectric spacer, and a ground plane [15] and can perfectly characterize the refractive index (RI) of analytes by feature extraction from the absorption spectra.…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Dual-Band Terahertz Perfect Absorber as a Highly Sensitive Sensor

Yin

Shen

et al. 2021

Front. Phys.

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Terahertz (THz) absorbers are highly desirable in sensing and detection devices. Herein, we have proposed a 3D dual-band near-perfect absorber that works in the THz regime for sensing applications. The theoretical calculation shows that the absorption efficiency of the absorber can reach 99.0 and 97.0% at 1.125 and 1.626 THz, respectively. Double absorption peaks can be tuned independently by alternating the geometric parameters of unit resonators. The underlying physical mechanism of the absorber matches well with the well-known impedance matching theory. Compared with its planar counterpart, our proposed absorber exhibits a figure of merit enhancement of at least two times due to its out-of-plane induced large interfacial area. Additionally, the absorber can work robustly at a wide range of incident angles and keep insensitive to polarization states, which renders it great for highly sensitive sensing.

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Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Dual-Band Terahertz Perfect Absorber as a Highly Sensitive Sensor

Yin

Shen

et al. 2021

Front. Phys.

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“…Metamaterial absorbers have been widely studied in recent years because they have such potential applications as photo-detection [1], sensing [2], solar cell [3], and thermal emission source [4]. For photo-detection and solar cell applications, broadband or multiband absorbers are needed [5][6][7][8][9][10][11][12][13][14][15][16][17]. However, for sensing and coherent thermal emission source applications, the narrower the absorption bandwidth is, the better performance it will have [18,19].…”

Section: Introductionmentioning

confidence: 99%

Small-Angle Ultra-Narrowband Tunable Mid-Infrared Absorber Composing from Graphene and Dielectric Metamaterials

et al. 2021

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We report a small-angle ultra-narrowband mid-infrared tunable absorber that uses graphene and dielectric metamaterials. The absorption bandwidth of the absorber at the graphene Fermi level of 0.2 eV is 0.055 nm, and the absorption peaks can be tuned from 5.14803 to 5.1411 μm by changing the graphene Fermi level. Furthermore, the resonance absorption only occurs in the angle range of several degrees. The simulation field distributions show the magnetic resonance and Fabry–Pérot resonance at the resonance absorption peak. The one-dimensional photonic crystals (1DPCs) in this absorber act as a Bragg mirror to efficiently reflect the incidence light. The simulation results also show that the bandwidth can be further narrowed by increasing the resonance cavity length. As a tunable mid-infrared thermal source, this absorber can possess both high temporal coherence and near-collimated angle characteristics, thus providing it with potential applications.

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“…The use of lossy materials in the periodic structure makes the incident electromagnetic field be strictly restricted and consumed inside, and thus obtaining high-performance electromagnetic wave absorbers [3][4][5][6]. According to the absorption characteristics, various terahertz metamaterial absorbers have been reported, which can be categorized into single-band absorbers [4,7,8], multi-band absorbers [9][10][11][12][13][14][15][16][17], and broadband absorbers [3,[18][19][20][21][22]. In 2008, Landy et al [23] proposed a classic sandwich structure in which the incident electric and magnetic fields were absorbed independently by the metamaterial resonator.…”

Section: Introductionmentioning

confidence: 99%

Structural Optimization of Single-Layer Graphene Metamaterial for Ultra-Broadband Terahertz Absorber

Hong

Shui

2021

IEEE Photonics J.

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We propose and validate an approach to obtain an ultra-broadband terahertz absorber by taking the advantages of the absorption of the surface plasmon resonance in combination with the absorption of the intrinsic mode. The absorber is composed of a gold (Au) bottom layer and a patterned graphene embedded in TOPAS polymer, exhibiting ultra-broadband absorption by coupling the surface plasmon resonance and the intrinsic modes. The single-layer graphene is patterned to C4 symmetric regular polygons which are arranged in circle circumscribed polygons (CUPs) or circle inscribed polygons (CIPs) at the same periodicity for comparison. With the increase of the side number (N), the strongest and weakest coupling of the surface plasmon resonance and the intrinsic modes was achieved at N = 4 (square) and ∞ (circle) for CUP and CIP arrangements, respectively. The optimum absorption bandwidth of 2.54 THz with relative absorption bandwidth of 109.5% above 90% absorption efficiency has been achieved for the circles with a diameter of 12.4 μm arranged at a gap distance of 1.0 μm. This design shows broader relative absorption bandwidth than previously reported single-layer graphene THz absorbers. Therefore, the proposed method would be highly valuable to design and manufacture ultra-broadband THz absorbers.

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Penta-band terahertz light absorber using five localized resonance responses of three patterned resonators

Cited by 75 publications

References 45 publications

A Three-Dimensional Dual-Band Terahertz Perfect Absorber as a Highly Sensitive Sensor

A Three-Dimensional Dual-Band Terahertz Perfect Absorber as a Highly Sensitive Sensor

Small-Angle Ultra-Narrowband Tunable Mid-Infrared Absorber Composing from Graphene and Dielectric Metamaterials

Structural Optimization of Single-Layer Graphene Metamaterial for Ultra-Broadband Terahertz Absorber

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