Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201701076
Keywords
2D materials; metamaterials; MXene; shielding efficiency; terahertz spectroscopy
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2016M3A6B3936653, 2017R1A2B3006469]
- Korea Government (MSIP) [2016R1A2B2010858, 2015R1A3A2031768]
- Korean government (MOE) [21A20131111123]
- KIST [2V05550, 2V05640, 2E26960, 2E27270]
- Korean National Research Foundation via the NNFC-KAIST-Drexel Nano Co-op Center [NRF-2015K1A4A3047100]
- Libyan North America Scholarship Program - Libyan Ministry of Higher Education and Scientific Research
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Terahertz (THz) shielding becomes increasingly important with the growing development of THz electronics and devices. Primarily materials based on carbon nanostructures or polymer-carbon nanocomposites have been explored for this application. Herein, significantly enhanced THz shielding efficiencies for 2D titanium carbide (Ti3C2 MXene) thin films with nanoscale THz metamaterials are presented. Nanoscale slot antenna arrays with strong resonances at certain frequencies enhance THz electromagnetic waves up to three orders of magnitude in transmission, which in turn enormously increases the shielding performance in combination with MXene films. Drop-casting of a colloidal solution of MXene (a few micrograms of dry material) can produce an ultrathin film (several tens of nanometers in thickness) on a slot antenna array. Consequently, THz waves strongly localized in the near-field regime by the slot antenna undergo enhanced absorption through the film with a magnified effective refractive index. Finally, the combination of an ultrathin MXene film and a nano-metamaterial shows excellent shielding performance in the THz range.
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