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Giant Field Enhancements in Ultrathin Nanoslots above 1 Terahertz

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Title
Giant Field Enhancements in Ultrathin Nanoslots above 1 Terahertz
Author
Kim, DasomJeong, JeeyoonChoi, GeunchangBahk, Young-MiKang, TaeheeLee, DukhyungThusa, BidhekKim, Dai-Sik
Issue Date
2018-05
Publisher
AMER CHEMICAL SOC
Citation
ACS PHOTONICS, v.5, no.5, pp.1885 - 1890
Abstract
Strong demand for plasmonic devices with an enormously enhanced electric field and desired resonance frequencies has led to extensive investigations of metallic slot structures. While strong field enhancement can be achieved by reducing the width of the slot, the effect of the gap surface plasmon limits the maximum achievable field enhancement at higher frequencies. Specifically, the effect of the gap surface plasmon becomes stronger as the gap width decreases and strongly suppresses the transmission while causing a red shift of the resonance. Here, we overcome these issues and realize strong field enhancements at higher frequencies, by managing the metal thickness of the nanoslots. We show that, as the nanoslots become as thin as 10 nm, they show a giant electric field enhancement of up to 7600. Moreover, the resonances are strongly blue-shifted to above 1 THz from 0.33 THz. Our work provides a novel route to achieving high field enhancements at desired frequencies, as well as a means by which to characterize the slot as the gap-sensitive or substrate-sensitive type.
URI
https://scholarworks.unist.ac.kr/handle/201301/26349
URL
https://pubs.acs.org/doi/10.1021/acsphotonics.8b00151
DOI
10.1021/acsphotonics.8b00151
ISSN
2330-4022
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PHY_Journal Papers
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