The interaction of terahertz electromagnetic radiation with dilute graphene-epoxy composites was studied experimentally at frequencies from 0.25 to 4 THz. Composites with low graphene loading (≤1.2 wt. %) below the electrical percolation threshold revealed the total shielding effectiveness above ∼70 dB (1 mm thickness) at 1.6 THz frequency. The unexpected high shielding effectiveness of dilute graphene composites in blocking terahertz radiation was mostly achieved by absorption rather than reflection. The shielding effectiveness increases with increasing frequency. Our results suggest that even the thin-film or spray coatings of the lightweight, electrically insulating graphene composites with thicknesses in the few-hundred-micrometer range can be sufficient for blocking terahertz radiation in many practical applications.
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7 February 2022
Research Article|
February 09 2022
Efficient terahertz radiation absorption by dilute graphene composites
Zahra Barani
;
Zahra Barani
1
Nano-Device Laboratory, Department of Electrical and Computer Engineering, University of California
, Riverside, California 92521, USA
2
Phonon Optimized Engineered Materials Center, University of California
, Riverside, California 92521, USA
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Kamil Stelmaszczyk
;
Kamil Stelmaszczyk
3
CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences
, Warsaw 01-142, Poland
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Fariborz Kargar
;
Fariborz Kargar
a)
1
Nano-Device Laboratory, Department of Electrical and Computer Engineering, University of California
, Riverside, California 92521, USA
2
Phonon Optimized Engineered Materials Center, University of California
, Riverside, California 92521, USA
a)Authors to whom correspondence should be addressed: [email protected] and [email protected]. URL: http://balandingroup.ucr.edu/
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Yevhen Yashchyshyn
;
Yevhen Yashchyshyn
3
CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences
, Warsaw 01-142, Poland
4
Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology
, Warsaw 00-665, Poland
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Grzegorz Cywiński
;
Grzegorz Cywiński
3
CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences
, Warsaw 01-142, Poland
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Sergey Rumyantsev
;
Sergey Rumyantsev
3
CENTERA Laboratories, Institute of High-Pressure Physics, Polish Academy of Sciences
, Warsaw 01-142, Poland
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Alexander A. Balandin
Alexander A. Balandin
a)
1
Nano-Device Laboratory, Department of Electrical and Computer Engineering, University of California
, Riverside, California 92521, USA
2
Phonon Optimized Engineered Materials Center, University of California
, Riverside, California 92521, USA
a)Authors to whom correspondence should be addressed: [email protected] and [email protected]. URL: http://balandingroup.ucr.edu/
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a)Authors to whom correspondence should be addressed: [email protected] and [email protected]. URL: http://balandingroup.ucr.edu/
Appl. Phys. Lett. 120, 063104 (2022)
Article history
Received:
November 25 2021
Accepted:
January 27 2022
Citation
Zahra Barani, Kamil Stelmaszczyk, Fariborz Kargar, Yevhen Yashchyshyn, Grzegorz Cywiński, Sergey Rumyantsev, Alexander A. Balandin; Efficient terahertz radiation absorption by dilute graphene composites. Appl. Phys. Lett. 7 February 2022; 120 (6): 063104. https://doi.org/10.1063/5.0079891
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