Design, theory, and measurement of a polarization-insensitive absorber for terahertz imaging

Landy, Nathan; Bingham, Chris; Tyler, Talmage; Jokerst, N.M.; Smith, David R.; Padilla, Willie J.

doi:10.1103/physrevb.79.125104

Cited by 703 publications

(363 citation statements)

References 41 publications

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“…This is different from most other works which focus on the real parts of electric permittivity ε(ω) and magnetic permeability µ(ω) and desire to get low loss. After that, some efforts have been made for metamaterial absorbers, such as polarization-insensitivity, omni-direction (wideangle), and broad band [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Metamaterial Modulators Based on Absorption

Zhou¹,

Ding²,

Jin³

et al. 2011

PIER

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Abstract-Metamaterial absorbers can perfectly absorb an incident wave in a narrow frequency band. In this paper, metamaterial absorbers are used to construct a terahertz modulator. By controlling the carrier density in the n-doped semiconductor spacer between a patterned metallic superstructure and a metallic ground with different applied voltage bias, the absorption varies sensitively, and the reflected wave amplitude acting as the modulated signal can be strongly modulated. Two types of modulators are investigated, one of which possesses an array of metallic crosses as the superstructure, and the other has a complementary superstructure. Compared with the former, the latter may give a better modulation performance.

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Section: Introductionmentioning

confidence: 99%

Terahertz Metamaterial Modulators Based on Absorption

Zhou¹,

Ding²,

Jin³

et al. 2011

PIER

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“…Recently metamaterials have been employed to construct EM wave absorbers [6][7][8][9][10][11][12]. Through designing the inclusion structures, the effective EM parameters of metamaterials can be tailored and unique values which are less than unity or even negative can be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Although metamaterial absorber has relatively narrow bandwidth, it possesses many advantages such as high absorption, low density, and thin thickness. Moreover, the frequency response can be tailored or scaled from microwave to terahertz and infrared regimes through carefully designing the constituent resonant structures [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Dual Band Switchable Metamaterial Electromagnetic Absorber

Zhu¹,

Huang²,

Feng

et al. 2010

PIER B

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Abstract-This paper presents the design, fabrication and measurement of a dual band switchable metamaterial electromagnetic absorber. The unit cell of the metamaterial consists of dipole mode electric resonators coupled by microwave diodes on one side of a dielectric substrate and metallic ground plane on the other side. Simulation and measurement results show that by forward or reverse biasing the diodes so as to change the coupling between the resonators, the absorber can be dynamically switched to operate in two adjacent frequency bands with nearly perfect peak absorption. Field distribution reveals the physical origin of the switchable performance based on the dipole mode of the electric resonator in the unit cell. It is also demonstrated that the frequency difference between the two bands can be tuned by adjusting the loading positions of the diodes with unchanged high absorption, which helps to design absorbers with specific switchable working frequencies in practical applications.

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“…The ERR couples to the incident electric fi eld and magnetic coupling is provided by the inclusion of a ground plane, as can be observed by anti-parallel currents on the metal surfaces. [27][28][29][30][31][32] At resonance, absorption is maximised by matching the wave impedance of the MM to the wave impedance of free space and engineering a large extinction coeffi cient. [28][29][30] Our SMM consists of plasmonic fi lters fabricated into the ground plane of a THz MM absorber, which uses a hollow cross shaped ERR.…”

mentioning

confidence: 99%

“…[27][28][29][30][31][32] At resonance, absorption is maximised by matching the wave impedance of the MM to the wave impedance of free space and engineering a large extinction coeffi cient. [28][29][30] Our SMM consists of plasmonic fi lters fabricated into the ground plane of a THz MM absorber, which uses a hollow cross shaped ERR. The SMM is capable of fi ltering fi fteen optical wavelengths and a NIR wavelength whilst simultaneously absorbing a single THz frequency through exploitation of two unique electromagnetic phenomena.…”

mentioning

confidence: 99%