A Two-Band Terahertz Absorber Based on Pyramid-Shaped Groove and Sensor Application

Sun, Bo; He, Kun; Yu, Ying

doi:10.1109/lpt.2016.2623350

Cited by 3 publications

(1 citation statement)

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“…A number of THz absorbers and metamaterial-based sensors have been introduced based on different detection schemes and structures [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], such as corrugated metal stripe [15], metal-dielectricmetal configuration [20], pyramidshape [21], planar structures based on breaking symmetry [22], photonic column array [23], cross metallic line structures [24], photonic crystal slab [25], graphene sheet with a patterned graphene to increase the sensitivity [26], graphene three-layer structure with different patterns [27], split ring resonators [28], and graphene-based structures [29][30][31][32][33][34]. In most of the above-cited studies, achieving angle and polarization independence to strengthening sensing performance has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Analytical design of tunable THz refractive index sensor for TE and TM modes using graphene disks

Rezagholizadeh¹,

Biabanifard²,

Borzooei³

2020

J. Phys. D: Appl. Phys.

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Novel metamaterial refractive index sensor based on impedance matching concept is proposed to achieve an ultra-narrowband absorption response in terahertz (THz) frequencies. To this end, the recently proposed circuit model of the periodic arrays of graphene disks has been exploited to model the graphene layer as circuit components while a developed transmission line method has been used to provide a circuit model for the whole structure. As a result, a perfect THz absorption response with absorptivity over 99.5% is achieved in desired resonance frequency. Two sensor structures at 3 and 6 THz have been designed as numerical examples, in which the frequency sensitivity of the structures is achieved as 0.834 and 1.57 THz per refractive index while the figure-of-merit of 11.75 and 24.5 are obtained, respectively. Its particular structure is polarization insensitive, further wide-angle absorptivity for both transverse electric and transverse magnetic waves is obtained. To verify the accuracy and validity of the presented circuit model approach, full-wave numerical modeling is performed.

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