Cargando…
Enhanced sensitivity in THz plasmonic sensors with silver nanowires
We developed hybrid slot antenna structures for microbial sensing in the THz frequency range, where silver nanowires (AgNWs) were employed to increase the sensitivity. In order to fabricate the hybrid devices, we partially etched the AgNW in the slot antenna region, where we can expect the field enh...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6195569/ https://www.ncbi.nlm.nih.gov/pubmed/30341310 http://dx.doi.org/10.1038/s41598-018-33617-2 |
_version_ | 1783364412463120384 |
---|---|
author | Hong, J. T. Jun, S. W. Cha, S. H. Park, J. Y. Lee, S. Shin, G. A. Ahn, Y. H. |
author_facet | Hong, J. T. Jun, S. W. Cha, S. H. Park, J. Y. Lee, S. Shin, G. A. Ahn, Y. H. |
author_sort | Hong, J. T. |
collection | PubMed |
description | We developed hybrid slot antenna structures for microbial sensing in the THz frequency range, where silver nanowires (AgNWs) were employed to increase the sensitivity. In order to fabricate the hybrid devices, we partially etched the AgNW in the slot antenna region, where we can expect the field enhancement effect at the AgNW tip. We measured the resonant-frequency shift observed upon the deposition of a polymer layer, and observed that the sensitivity increased upon the introduction of AgNWs, with an enhancement factor of more than four times (approximately six times in terms of figure-of-merit). The sensitivity increased with the AgNW density until saturation. In addition, we tested devices with PRD1 viruses, and obtained an enhancement factor of 3.4 for a slot antenna width of 3 μm. Furthermore, we performed finite-difference time-domain simulations, which confirmed the experimental results. The sensitivity enhancement factor decreased with the decrease of the slot width, consistent with the experimental findings. Two-dimensional mapping of the electric field confirmed the strong field localization and enhancement at the AgNW tips. |
format | Online Article Text |
id | pubmed-6195569 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-61955692018-10-24 Enhanced sensitivity in THz plasmonic sensors with silver nanowires Hong, J. T. Jun, S. W. Cha, S. H. Park, J. Y. Lee, S. Shin, G. A. Ahn, Y. H. Sci Rep Article We developed hybrid slot antenna structures for microbial sensing in the THz frequency range, where silver nanowires (AgNWs) were employed to increase the sensitivity. In order to fabricate the hybrid devices, we partially etched the AgNW in the slot antenna region, where we can expect the field enhancement effect at the AgNW tip. We measured the resonant-frequency shift observed upon the deposition of a polymer layer, and observed that the sensitivity increased upon the introduction of AgNWs, with an enhancement factor of more than four times (approximately six times in terms of figure-of-merit). The sensitivity increased with the AgNW density until saturation. In addition, we tested devices with PRD1 viruses, and obtained an enhancement factor of 3.4 for a slot antenna width of 3 μm. Furthermore, we performed finite-difference time-domain simulations, which confirmed the experimental results. The sensitivity enhancement factor decreased with the decrease of the slot width, consistent with the experimental findings. Two-dimensional mapping of the electric field confirmed the strong field localization and enhancement at the AgNW tips. Nature Publishing Group UK 2018-10-19 /pmc/articles/PMC6195569/ /pubmed/30341310 http://dx.doi.org/10.1038/s41598-018-33617-2 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Hong, J. T. Jun, S. W. Cha, S. H. Park, J. Y. Lee, S. Shin, G. A. Ahn, Y. H. Enhanced sensitivity in THz plasmonic sensors with silver nanowires |
title | Enhanced sensitivity in THz plasmonic sensors with silver nanowires |
title_full | Enhanced sensitivity in THz plasmonic sensors with silver nanowires |
title_fullStr | Enhanced sensitivity in THz plasmonic sensors with silver nanowires |
title_full_unstemmed | Enhanced sensitivity in THz plasmonic sensors with silver nanowires |
title_short | Enhanced sensitivity in THz plasmonic sensors with silver nanowires |
title_sort | enhanced sensitivity in thz plasmonic sensors with silver nanowires |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6195569/ https://www.ncbi.nlm.nih.gov/pubmed/30341310 http://dx.doi.org/10.1038/s41598-018-33617-2 |
work_keys_str_mv | AT hongjt enhancedsensitivityinthzplasmonicsensorswithsilvernanowires AT junsw enhancedsensitivityinthzplasmonicsensorswithsilvernanowires AT chash enhancedsensitivityinthzplasmonicsensorswithsilvernanowires AT parkjy enhancedsensitivityinthzplasmonicsensorswithsilvernanowires AT lees enhancedsensitivityinthzplasmonicsensorswithsilvernanowires AT shinga enhancedsensitivityinthzplasmonicsensorswithsilvernanowires AT ahnyh enhancedsensitivityinthzplasmonicsensorswithsilvernanowires |