Journal
PHYSICAL REVIEW APPLIED
Volume 5, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.5.064018
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Funding
- Korean NRF through Grant NRF [2016R1A2B4010105]
- U.S. Air Force Summer Faculty Fellowship Program (USAF-SFFP)
- National Research Foundation of Korea [2016R1A2B4010105] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We introduce here a parity-time-(PT) symmetric system using an optically pumped, active graphene metasurface paired with a resistive metallic filament, realizing a unidirectional reflectionless propagation of terahertz (THz) waves. The amplified THz stimulated emission and tailored plasmon resonances in the graphene metasurface may achieve an equivalent negative-resistance converter at THz frequencies. We theoretically demonstrate that the combination of the spectral singularity in a PT -symmetric system and the chemical sensitivity of graphene may give rise to exotic scattering responses, strongly influenced by the presence of charged impurities in graphene at the spontaneous PT -symmetry-breaking point. This graphene-based PT -symmetric device may have broad relevance beyond the extraordinary manipulation of THz waves, as it may also open exciting prospects for detecting gas, chemical, and biological agents with high sensitivities.
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