Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.125501
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [CRI 2015031768, 2005-0093838, 2008-00580, 2011-0017494, WCI 2011-001]
- Brain Korea 21 Plus Project
- Center for Advanced Meta-Materials (CAMM) - Korea government (MSIP) as Global Frontier Project [CAMM-2014M3A6B3063709]
- National Research Foundation of Korea [2011-0017494, 2005-0093838, 2015R1A3A2031768, WCI 2011-001, 76942-15-A, 2008-00580, 2014M3A6B3063709] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Metal-graphene-metal hybrid structures allow angstrom-scale van derWaals gaps, across which electron tunneling occurs. We squeeze terahertz electromagnetic waves through these lambda/10000000 gaps, accompanied by giant field enhancements. Unprecedented transmission reduction of 97% is achieved with the transient voltage across the gap saturating at 5 V. Electron tunneling facilitated by the transient electric field strongly modifies the gap index, starting a self-limiting process related to the barrier height. Our work enables greater interplay between classical optics and quantum tunneling, and provides optical indices to the van der Waals gaps.
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