Highly efficient, polarization insensitive terahertz metamaterial perfect absorber and imaging

2012 ◽  
Author(s):  
David. S. Wilbert ◽  
Mohammad P. Hokmabadi ◽  
William Baughman ◽  
Patrick Kung ◽  
Seongsin M. Kim
Keyword(s):  
Perfect Absorber ◽  
Highly Efficient ◽  
Polarization Insensitive ◽  
Metamaterial Perfect Absorber

scholarly journals Flexible Broadband Metamaterial Perfect Absorber Based on Graphene-Conductive Inks

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 440
Author(s):  
Le Van Long ◽  
Nguyen Sy Khiem ◽  
Bui Son Tung ◽  
Nguyen Thanh Tung ◽  
Trinh Thi Giang ◽  
...  
Keyword(s):  
Impedance Matching ◽  
Optical Filters ◽  
Wide Frequency Range ◽  
Absorption Feature ◽  
Perfect Absorber ◽  
Frequency Range ◽  
Absorption Mechanism ◽  
Polarization Insensitive ◽  
Metamaterial Perfect Absorber ◽  
High Absorption

In this work, we proposed a flexible broadband metamaterial perfect absorber (FBMPA) by exploiting a pasted conductive-graphene ink on a polyimide substrate. For the flat FBMPA, an absorption over 90% was found to cover a wide frequency range (from 7.88 to 18.01 GHz). The high-absorption feature was polarization-insensitive and regarded as stable with respect to the oblique incidence up to 30 degrees of electromagnetic wave. The high absorption was maintained well even when the absorber was wrapped. That is, the FBMPA was attached to cylindrical surfaces (with the varying radius from 4 to 50 cm). For both flat and curved states, the absorption mechanism was explained by the perfect impedance matching and the dielectric loss of the proposed absorber. Our work provides the groundwork for the commercialization of future meta-devices such as sensors, optical filters/switchers, photodetectors, and energy converters.

scholarly journals Conductive polymer for ultra-broadband, wide-angle, and polarization-insensitive metamaterial perfect absorber

2018 ◽  
Vol 26 (25) ◽  
pp. 33253 ◽  
Author(s):  
Le Dinh Hai ◽  
Vu Dinh Qui ◽  
Nguyen Hoang Tung ◽  
Tran Van Huynh ◽  
Nguyen Dinh Dung ◽  
...  
Keyword(s):  
Conductive Polymer ◽  
Perfect Absorber ◽  
Wide Angle ◽  
Polarization Insensitive ◽  
Metamaterial Perfect Absorber

scholarly journals Multiband Polarization Insensitive and Tunable Terahertz Metamaterial Perfect Absorber Based on The Heterogeneous Structure of Graphene

2021 ◽  
Author(s):  
Amirhossein Norouzi Razani ◽  
Pejman Rezaei
Keyword(s):  
Fermi Level ◽  
Electric Fields ◽  
Incident Angle ◽  
Heterogeneous Structure ◽  
Perfect Absorber ◽  
Absorption Mechanism ◽  
Central Disk ◽  
Polarization Insensitive ◽  
Metamaterial Perfect Absorber ◽  
Multi Band

Abstract In this paper, we present and investigate a multi-band metamaterial perfect absorber (MPA) based on the heterogeneous structure of graphene with Cu and SiO 2 substrates. The top layer of structure consist of one graphene disk at the center and four graphene solid triangle with semicircular cuts on them that surround the central disk. This heterogeneous structure causes us to achieve 97.06%, 94.71%, 99.7% and 99.5% perfect absorptions peaks at 28239.7 nm, 31048.9 nm, 50898.6 nm and 70689.1 nm, respectively. The absorption mechanism based on electric fields has been investigated. We can shift the wavelength of absorption peaks to our required wavelength by changing the Fermi level (µc) of graphene. Two absorption peaks of this absorber remain unchanged in different incident angle. In addition, very important point about this structure is that it is not sensitive to polarization and this feature makes the proposed absorber very suitable for applications such as imaging, filtering, sensing and detecting applications.

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