Electromagnetic Saturation of Angstrom-Sized Quantum Barriers at Terahertz Frequencies

被引：67

作者：

Bahk, Young-Mi ^{[1
,2
]}

Kang, Bong Joo ^{[3
,4
]}

Kim, Yong Seung ^{[5
,6
]}

Kim, Joon-Yeon ^{[1
,2
]}

Kim, Won Tae ^{[3
,4
]}

Kim, Tae Yun ^{[1
,7
]}

Kang, Taehee ^{[1
,2
]}

Rhie, Jiyeah ^{[1
,2
]}

Han, Sanghoon ^{[8
]}

Park, Cheol-Hwan ^{[1
,7
]}

Rotermund, Fabian ^{[3
,4
]}

Kim, Dai-Sik ^{[1
,2
]}

机构：

[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea

[2] Seoul Natl Univ, Ctr Atom Scale Electromagnetism, Seoul 151747, South Korea

[3] Ajou Univ, Dept Energy Syst Res, Suwon 443749, South Korea

[4] Ajou Univ, Dept Phys, Suwon 443749, South Korea

[5] Sejong Univ, Graphene Res Inst, Seoul 143747, South Korea

[6] Sejong Univ, Dept Phys, Seoul 143747, South Korea

[7] Seoul Natl Univ, Ctr Theoret Phys, Seoul 151747, South Korea

[8] Seoul Natl Univ, Sch EECS, Photon Syst Lab, Seoul 151744, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

DER-WAALS HETEROSTRUCTURES; SUBNANOMETER GAPS; FIELD ENHANCEMENT; GOLD NANOSTRUCTURES; GRAPHENE; PLASMONICS; SUPERCONDUCTIVITY; METAMATERIAL; GENERATION; DEPENDENCE;

D O I：

10.1103/PhysRevLett.115.125501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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