Polarization-insensitive dual-band terahertz metamaterial absorber based on asymmetric arrangement of two rectangular-shaped resonators

Le, Dac Tuyen; Tong, Ba Tuan; Nguyen, Thi Kim Thu; Cao, Thanh Nghia; Nguyễn, Hồng Quang; Tran, Manh Cuong; Truong, Chi Lam; Bùi, Xuân Khuyến; Vu, Dinh Lam; Nguyen, Thi Quynh Hoa

doi:10.1016/j.ijleo.2021.167669

Cited by 9 publications

(5 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reflection spectra of the metamaterial absorber are observed in Figure 2, where the absorber has three resonance peaks at f a = 0:871 THz, f b = 1:075 THz, and f c = 1:397 THz . The frequency-dependent absorption value is defined as follows [27]:…”

Section: Resultsmentioning

confidence: 99%

High-Sensitivity Multiband Detection Based on the Local Enhancement Effect of an Electric Field at Terahertz Frequency

et al. 2022

View full text Add to dashboard Cite

The terahertz detection sensitivity interaction with other substances has received extensive attention and remains challenging due to the loss of terahertz waves. Herein, a terahertz, multiband sensor with high sensitivity based on the local enhancement effect of an electric field at terahertz frequency is proposed. The designed terahertz sensor is based on a common metamaterial sandwich absorber of electromagnetic energy that only employs an asymmetric metallic strip, which produces three resonance peaks with an absorption coefficient of greater than 95% in the 0.2-1.5 THz range and a maximum Q -factor of 46 at 1.397. Based on the principle of impedance matching, the high absorption of electromagnetic wave energy is reasonably analyzed. Furthermore, the influence of the top metal structure on the absorptivity and resonance frequency is analyzed by simulation optimization, and the optimum structural parameters are obtained. In addition, the influence of the refractive index (RI) change of the sample and dielectric layer on the resonance characteristics of the sensor is analyzed. When the thickness of the surface sample of the terahertz sensor metamaterial-based absorber is changed so that the RI changes in 1-2, the RI sensitivity increases up to 208 GHz/RIU, which can be used as an RI sensor. Furthermore, the influence of the sensor sensitivity and reflection coefficient on the thickness parameters of the sample covered by the sensor surface is analyzed, and the optimal sample thickness is 6 μm. The influence of the incident angle of the THz wave on the detection performance in the TM polarization mode is analyzed, and it is determined that the change in the incident angle in the range of 0-40 degrees has minimal influence on the resonance peak and absorption rate of multiband detection. Therefore, we suggest that our proposed sensor has considerable potential in biomedicine and trace detection applications.

show abstract

Section: Resultsmentioning

confidence: 99%

High-Sensitivity Multiband Detection Based on the Local Enhancement Effect of an Electric Field at Terahertz Frequency

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Metamaterials are artificial materials formed by arranging material structures according to certain rules; from there, many interesting physical properties that do not exist in nature can be obtained, for example, negative refractive index [1,2] asymmetric transmission [3,4], cross-polarization conversion [5,6], and perfect absorption [7,8]. According to previous research on metamaterial absorbers (MAs), there have been more studies on absorbers [9], ranging from the microwave [10,11] to the terahertz [12][13][14], infrared, and even visible regions, achieving perfect absorption [15,16], polarization insensitivity [17][18][19][20], wide incidence angle [21][22][23], and adjustable absorption [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Multi-Layered Metamaterial Absorber: Electromagnetic and Thermal Characterization

Khuyen,

Viet,

Son

et al. 2024

Photonics

View full text Add to dashboard Cite

Metamaterials, recognized as advanced artificial materials endowed with distinctive properties, have found diverse applications in everyday life, military endeavors, and scientific research. Starting from monolayer metamaterials, multilayer ones are increasingly researched, especially in the field of electromagnetic wave absorption. In this article, we propose a multilayer metamaterial-absorber (MA) structure comprising two resonant layers crafted with copper and FR-4 dielectric. The presented multilayer MA structure exhibited an absorption greater than 90% in a frequency range from 4.84 to 5.02 GHz, with two maximum absorption peaks at 4.89 and 4.97 GHz. The bandwidth of the multilayer MA surpassed that of the individual single-layer MAs, with extension fractions reaching 360% and 257%, respectively. Through the simulation and calculation, the field distribution and equivalent circuit model elucidated that both individual magnetic resonances and their interplay contribute significantly to the absorption behavior of the multilayer MA. The absorption of the proposed multilayer MA structure was also investigated for the oblique incidence in the transverse electric (TE) and transverse magnetic (TM) modes. In the TE mode, the absorption intensity of two maximum peaks was maintained at over 93% up to an incident angle of 40 degrees and dropped to below 80% at an incident angle of 60 degrees. In the TM mode, the absorption was more stable and not significantly affected by the incident angle, ranging from 0 to 60 degrees. An absorption greater than 97% was observed when the incident angle increased from 0 to 60 degrees in the TM mode. Additionally, the approach in our work was further demonstrated by adding more resonant layers, making 3- and 4-layer structures. The results indicated that the absorption bandwidths of the 3- and 4-layer structures increased by 16% and 33%, respectively, compared to the bilayer structure. Furthermore, we analyzed the thermal distribution within the MA to understand the dissipation of absorbed electromagnetic energy. This research offers valuable insight into the augmented MA through a multilayer structure, presenting the implications for microwave applications like electromagnetic shielding, as well as in the design of MAs for terahertz devices and technologies, including emission and thermal imaging. These findings contribute to the advancement of knowledge in enhancing the absorption capabilities across various frequency ranges, expanding the potential applications of metamaterials.

show abstract

“…The first concept of metamaterial absorber (MA) was demonstrated by Landy et al [11]. From then on, singleband, dual-band, triple-band, quad-band, penta-band, six-band, and hepta-band MAs have been proposed and investigated widely [12][13][14][15][16][17][18]. These MAs can be called single-band or multi-band MAs.…”

Section: Introductionmentioning

confidence: 99%

All-Silicon Polarization-Insensitive Metamaterial Absorber in the Terahertz Range

Xu,

Li,

Han

et al. 2024

Materials

View full text Add to dashboard Cite

All-silicon terahertz absorbers have attracted considerable interest. We present a design and numerical study of an all-silicon polarization-insensitive terahertz metamaterial absorber. The meta-atoms of the metamaterial absorber are square silicon rings which can be viewed as gratings. By properly optimizing the structure of the meta-atom, we achieve a broadband absorptivity that is above 90% ranging from 0.77 THz to 2.53 THz, with a relative bandwidth of 106.7%. Impedance matching reduces the reflection of the terahertz waves and the (0, ±1)-order diffraction induce the strong absorption. The absorption of this absorber is insensitive to the polarization of the terahertz wave and has a large incident angle tolerance of up to 60 degrees. The all-silicon metamaterial absorber proposed here provides an effective way to obtain broadband absorption in the terahertz regime. Metamaterial absorbers have outstanding applications in terahertz communication and imaging.

show abstract

Polarization-insensitive dual-band terahertz metamaterial absorber based on asymmetric arrangement of two rectangular-shaped resonators

Cited by 9 publications

References 50 publications

High-Sensitivity Multiband Detection Based on the Local Enhancement Effect of an Electric Field at Terahertz Frequency

High-Sensitivity Multiband Detection Based on the Local Enhancement Effect of an Electric Field at Terahertz Frequency

Multi-Layered Metamaterial Absorber: Electromagnetic and Thermal Characterization

All-Silicon Polarization-Insensitive Metamaterial Absorber in the Terahertz Range

Contact Info

Product

Resources

About