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Keywords = gaptronics

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12 pages, 2783 KB  
Article
Strain versus Tunable Terahertz Nanogap Width: A Simple Formula and a Trench below
by Hwanhee Kim, Mahsa Haddadi Moghaddam, Zhihao Wang, Sunghwan Kim, Dukhyung Lee, Hyosim Yang, Myongsoo Jee, Daehwan Park and Dai-Sik Kim
Nanomaterials 2023, 13(18), 2526; https://doi.org/10.3390/nano13182526 - 9 Sep 2023
Cited by 1 | Viewed by 2023
Abstract
A flexible zerogap metallic structure is periodically formed, healing metal cracks on a flexible substrate. Zerogap is continuously tunable from nearly zero to one hundred nanometers by applying compressive strains on the flexible substrate. However, there have been few studies on how the [...] Read more.
A flexible zerogap metallic structure is periodically formed, healing metal cracks on a flexible substrate. Zerogap is continuously tunable from nearly zero to one hundred nanometers by applying compressive strains on the flexible substrate. However, there have been few studies on how the gap width is related to the strain and periodicity, nor the mechanism of tunability itself. Here, based on atomic force microscopy (AFM) measurements, we found that 200 nm-deep nano-trenches are periodically generated on the polymer substrate below the zerogap owing to the strain singularities extant between the first and the second metallic deposition layers. Terahertz and visible transmission properties are consistent with this picture whereby the outer-bending polyethylene terephthalate (PET) substrate controls the gap size linearly with the inverse of the radius of the curvature. Full article
(This article belongs to the Special Issue Nanomaterials for Terahertz Technology Applications)
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