Wideband optical absorber based on plasmonic metamaterial cross structure

Soheilifar, Mohammad Reza

doi:10.1007/s11082-018-1687-6

Cited by 13 publications

(5 citation statements)

References 41 publications

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“…where , and ∞ are the plasma frequency, the collision frequency and high frequency relative permittivity of silver which are chosen to be 1.38×10 16 Hz, 2.37×10 13 Hz and 3.7, respectively [19].…”

Section: Simulation Methods and Materialsmentioning

confidence: 99%

“…This is realizable through enhancement of the intensity of their electromagnetic plasmon fields at the desired wavelengths. Two typical methods have been proposed to improve the strength of these plasmon fields: 1) optimization of the structural parameters and materials [1][2][3][4][5][6][7][8][9], 2) assembly of the plasmonic nanoparticles in order to create strong coupling interactions between the plasmon fields of neighboring nanoparticles through hybridization [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Giessen et al showed that coupling strength of plasmon Fano resonances in a metallic photonic crystal can be controlled by varying the thickness of a spacer layer between the gold grating and the waveguide layer [12]. A wide bandwidth plasmonic meta-material absorber containing a broken cross as an elementary cell along with four rectangular loads has been proposed to improve the absorbance and achieve a tunable Fano response [13]. In [15], a crossed ring-shaped meta-surface with highly tunable dual-Fano resonance peaks is proposed and numerically investigated.…”

Section: Introductionmentioning

confidence: 99%

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Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

Mashkour

Koochaki

Ziabari

et al. 2021

Preprint

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In this paper a Metal-Insulator-Metal (MIM) plasmonic absorber consisting of asymmetric double bars with bent arms located on top of a silica layer coated on a metal film is proposed, and its resonant features are analyzed. The suggested structure supports both Fano and dipole perfect absorption resonances at the Near-Infrared Region (NIR). The asymmetry introduced into the structure can be induced by changing the bending angle or rotation angle of one of the antennas while the other one remains fixed. Simulation results demonstrate that by applying both asymmetry factors to the structure, one can have two individual Fano peaks at the same time. It is shown that the magnitude, central wavelength and line-width of the Fano peaks are adjustable by controlling the geometrical parameters of the structure. It is also indicated that, the quality factor (Q-factor) of the Fano resonance is inversely related to the degree of asymmetry introduced into the structure. According to the simulations, an ultra-narrow resonance peak with a bandwidth of 1.87 nm at the wavelength of 710 nm (corresponding to a Q-factor of 387) can be obtained by controlling the geometrical parameters. It is also discussed that, the absorptivity of Fano and the dipole peaks can be adjusted inversely, by manipulating the grapheme chemical potential. The ratio of the absorptivity to the chemical potential of graphene about-275 %/eV and 226 %/eV is calculated for the Fano peak and dipole peak, respectively. Accordingly, the presented structure is an adjustable NIR absorber with a fully tunable absorption spectrum which can be utilized in various applications from tunable reflectors and photo-detectors to ultra-narrowband and broadband optical modulators.

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Section: Simulation Methods and Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

Mashkour

Koochaki

Ziabari

et al. 2021

Preprint

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show abstract

“…Some structures convert the linear EM waves through transmission, while others convert via reflection from the surface [15, 16]. Different metamaterial structures are used for different frequency ranges such as nanorod has been used for visible region [17], split rings are used for infrared region [18], for terahertz metallic grating complementary rings are used [18, 19], and for microwave region diagonally placed structures are implemented [20, 21].…”

Section: Introductionmentioning

confidence: 99%

A wideband metamaterial linear to linear conversion for X-band applications

Gupta

Shukla²,

Pushpalata

2022

Int. J. Microw. Wireless Technol.

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This article presents wideband metamaterial cross-polarizer (MCP) structure for X-band applications. The proposed MCP consists of a splitted square-shaped resonating structure with two inner and one outer stub. It has an overall dimension of 8.6 mm × 8.6 mm. A wideband polarization conversion ratio (PCR) above 0.87 magnitude is achieved with a bandwidth of 3.49 GHz ranging from 8.8 to 12.29 GHz, which works for X (8–12 GHz) band. The PCR bandwidth of full width half maxima achieved is 4.55 GHz ranging from 8.5 to 13.05 GHz. Two distinct PCR peaks are observed at 9.44 and 11.47 GHz with PCR magnitude at 99.39 and 99.00% respectively. The normalized impedance and electromagnetic parameters (real and imaginary) curves proved the presence of metamaterial properties in the region of interest. Analysis of polarization conversion phenomena at two distinct frequencies is described with the help of electric field and current distribution. The structure is replicated using ANSYS HFSS 19.1 and measured inside anechoic chamber with the help of Vector Network Analyzer (VNA). The replicated and experimented responses obtained are almost similar to one another with adaptation due to fabrication liberality.

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“…The THz absorber is more interesting because the energy can be concentrated [18]. Thus the sensitivity and Figure of merit (FOM) will increase which are vital for the sensors [19].…”

Section: Introductionmentioning

confidence: 99%

THz absorber for breast cancer early detection based on graphene as multi-layer structure

Rezazadeh

Soheilifar²

2021

Opt Quant Electron

Self Cite

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─ Today, the cost of treating cancer is very high, so early detection of cancer is essential, and one of the possible ways to diagnose cancer in the early stages is to use sensors that are made in the terahertz area. The proposed structure is a multilayer structure in which graphene is used in the upper and middle layer and the middle layer has a ribbon form. A disk form element is used in the upper layer. Finally, a ring is added to the structure. In the final structure of the ring, it actually inhibits the field, and this will increase the Q-factor at 6.7 THz. The interaction of layers on each other and their effect on reflection is studied to modify the final structure by variation of the chemical potential of the graphene layer in the range of 0.2 to 0.6 eV. Finally, the proposed absorber is used to discriminate cancer and healthy breast tissue. The effect of the thickness and distance of the tissue from the absorber are examined to realize the material effect on sensitivity and figure of merit (FOM) as two main factors for detecting the cancer tissue.

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Wideband optical absorber based on plasmonic metamaterial cross structure

Cited by 13 publications

References 41 publications

Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

A wideband metamaterial linear to linear conversion for X-band applications

THz absorber for breast cancer early detection based on graphene as multi-layer structure

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