A novel wide-band tunable metamaterial absorber based on varactor diode/graphene

Ma, Ben; Liu, Shaobin; Kong, Xiangkun; Jiang, Yuchi; Jia, Xu; Yang, Hua

doi:10.1016/j.ijleo.2015.11.168

Cited by 25 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the simplest scenario, all varactors are controlled by one and the same voltage, which effectively gives frequency tunability to the functionality the metasurface is designed for [47]- [50]. The most widely investigated functionality is tunable perfect absorption, where a change in the reverse biasing voltages of the varactors shifts the spectrum of the perfect absorption resonance [51]- [54]. Typical values for the (reverse) voltage range are 0-20 V corresponding to an equivalent capacitance range of a few pico-Farad, e.g.…”

Section: B Continuous Tuning Varactorsmentioning

confidence: 99%

Programmable Metasurfaces: State of the Art and Prospects

Pitilakis

Mirmoosa

et al. 2018

2018 IEEE International Symposium on Circuits and Systems (ISCAS)

View full text Add to dashboard Cite

Metasurfaces, ultrathin and planar electromagnetic devices with sub-wavelength unit cells, have recently attracted enormous attention for their powerful control over electromagnetic waves, from microwave to visible range. With tunability added to the unit cells, the programmable metasurfaces enable us to benefit from multiple unique functionalities controlled by external stimuli. In this review paper, we will discuss the recent progress in the field of programmable metasurfaces and elaborate on different approaches to realize them, with the tunability from global aspects, to local aspects, and to software-defined metasurfaces.

show abstract

Section: B Continuous Tuning Varactorsmentioning

confidence: 99%

Programmable Metasurfaces: State of the Art and Prospects

Pitilakis

Mirmoosa

et al. 2018

2018 IEEE International Symposium on Circuits and Systems (ISCAS)

View full text Add to dashboard Cite

show abstract

“…A good agreement is observed between the measured and simulated responses except small deviations, which are mostly due to small error in fabrication tolerance. [5] 26.74 no yes [6] 10.74 no yes [7] 45.90 no yes [8] 25.27 no yes Proposed structure 192.59 yes no…”

Section: Jsurf[a_per_m]mentioning

confidence: 99%

“…On the contrary, varactor controlled absorbers exhibit tunable absorption frequency with constant absorption bandwidth. In [5][6][7][8], single-band tunable absorbers are developed by mounting the varactors along the incident electric field direction. However, all these tunable absorbers have asymmetrical designs, exhibiting polarisation-sensitive behaviours.…”

mentioning

confidence: 99%

Polarisation‐independent tunable absorber with embedded biasing network

Ghosh

Srivastava

2017

Electron. lett.

View full text Add to dashboard Cite

A polarisation-independent tunable absorber has been presented with wide tuning range. The proposed design consists of periodic patterns of square loops connected through varactor diodes, thus resulting in tunable performance. Due to four-fold symmetric design, the structure exhibits tunable characteristic for all polarisation angles unlike the earlier reported tunable absorbers. Furthermore, the configuration also eliminates the need for any external biasing network, and therefore avoids the design difficulties associated with the added bias grids. A prototype of the proposed structure has been fabricated, whose measured results show good agreement with the simulated responses under normal incidence.

show abstract

“…Metasurfaces can achieve unique properties, such as negative permittivity, negative permeability, a negative refractive index, an inverse Doppler effect, and inverse Snell’s law through artificial design. − These unique electromagnetic properties of the metasurface have attracted widespread attention. The metasurface absorber can achieve high absorption of THz waves and currently shows great applicational potential in medicine, biology, and aerospace exploration. − In 2008, Landy et al designed a metasurface device capable of perfect absorption, which consists of a surface metal resonator, a polyimide dielectric layer, and a bottom metal strip. , The results showed that the absorptance was above 99% at 11.48 GHz. The absorber had high absorptance and a small unit size, but its absorption frequency band was narrow, and it was very sensitive to the polarization direction of electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

“…The metasurface absorber can achieve high absorption of THz waves and currently shows great applicational potential in medicine, biology, and aerospace exploration. 6 − 11 In 2008, Landy et al designed a metasurface device capable of perfect absorption, which consists of a surface metal resonator, a polyimide dielectric layer, and a bottom metal strip. 12 , 13 The results showed that the absorptance was above 99% at 11.48 GHz.…”

Section: Introductionmentioning

confidence: 99%

Metasurface Terahertz Perfect Absorber with Strong Multi-Frequency Selectivity

Zhou

et al. 2022

ACS Omega

View full text Add to dashboard Cite

In this paper, we design a metasurface terahertz perfect absorber with multi-frequency selectivity and good incident angle compatibility using a double-squared open ring structure. Simulations reveal five selective absorption peaks located at 0−1.2 THz with absorption 94.50% at 0.366 THz, 99.99% at 0.507 THz, 95.65% at 0.836 THz, 98.80% at 0.996 THz, and 86.70% at 1.101 THz, caused by two resonant absorptions within the fundamental unit (fundamental mode of resonance absorption, FRA) and its adjacent unit (supermodel of resonance absorption, SRA) in the structure, respectively, when the electric field of the electromagnetic wave is incident perpendicular to the opening. The strong frequency selectivity at 0.836 THz with a Q-factor of 167.20 and 0.996 THz with a Q-factor of 166.00 is due to the common effect of the FRA and SRA. Then, the effect of polarized electromagnetic wave modes (TE and TM modes) at different angles of incidence (θ) and the size of the open rings on the device performance is analyzed. We find that for the TM mode, the absorption of the resonance peak changes only slightly at θ = 0−80°, which explains this phenomenon. The frequency shift of the absorption peaks caused by the size change of the open rings is described reasonably by an equivalent RLC resonant circuit. Next, by adjusting two-dimensional materials and photosensitive semiconductor materials embedded in the unit structure, the designed metasurface absorber has excellent tunable modulation. The absorption modulation depth (MD) reaches ≈100% using the conductivity of photosensitive semiconductor silicon (σ SI-ps ), indicating excellent control of the absorption spectrum. Our results can greatly promote the absorption of terahertz waves, absorption spectrum tunability, and frequency selectivity of devices, which are useful in the applications such as resonators, biodetection, beam-controlled antennas, hyperspectral thermal imaging systems, and sensors.

show abstract

A novel wide-band tunable metamaterial absorber based on varactor diode/graphene

Cited by 25 publications

References 26 publications

Programmable Metasurfaces: State of the Art and Prospects

Programmable Metasurfaces: State of the Art and Prospects

Polarisation‐independent tunable absorber with embedded biasing network

Metasurface Terahertz Perfect Absorber with Strong Multi-Frequency Selectivity

Contact Info

Product

Resources

About