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Kim, Dai-Sik
Nano Optics Group
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Colossal Terahertz Field Enhancement Using Split-Ring Resonators with a Sub-10 nm Gap

Author(s)
Kim, NayeonIn, SungjunLee, DukhyungRhie, JiyeahJeong, JeeyoonKim, Dai-SikPark, Namkyoo
Issued Date
2018-02
DOI
10.1021/acsphotonics.7b00627
URI
https://scholarworks.unist.ac.kr/handle/201301/26359
Fulltext
https://pubs.acs.org/doi/10.1021/acsphotonics.7b00627
Citation
ACS PHOTONICS, v.5, no.2, pp.278 - 283
Abstract
Terahertz (THz) nanogap structures have emerged as versatile platforms for THz science and applications by virtue of their strong in-gap field enhancements and accompanying high levels of sensitivity to gap environments. However, despite their potential, reliable fabrication methods by which to create THz structures with sub-10 nm gaps remain limited. In this work, we fabricated THz split-ring resonator (SRR) arrays featuring a sub-10 nm split gap. Our fabrication method, involving photolithography, argon ion milling, and atomic layer deposition, is a high-throughput technique that is also applicable to the fabrication of other THz structures with sub 10 nm gaps. Through THz-time domain spectroscopy and a numerical simulation, we identified the fundamental magnetic resonances of the nanogap SRRs, at which the electric field enhancement factor is experimentally estimated to be around 7000. This substantial field enhancement makes SRRs with a sub-10 nm gap suitable for the study of high-field phenomena and related applications.
Publisher
AMER CHEMICAL SOC
ISSN
2330-4022
Keyword (Author)
terahertznanogapsplit ring resonatorfield enhancementatomic layer deposition
Keyword
VANADIUM DIOXIDE METAMATERIAL2ND-HARMONIC GENERATIONNANOANTENNASPLASMONICSTRANSITION

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