Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays

Nonlinear spectroscopic investigation in the terahertz (THz) range requires significant field strength of the light fields. It is still a challenge to obtain the required field strengths in free space from table-top laser systems at sufficiently high repetition rates to enable quantitative nonlinear...

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Main Authors:	Klarskov, Pernille, Tarekegne, Abebe T., Iwaszczuk, Krzysztof, Zhang, X.-C., Jepsen, Peter Uhd
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5123578/

id	pubmed-5123578
recordtype	oai_dc
spelling	pubmed-51235782016-12-07 Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays Klarskov, Pernille Tarekegne, Abebe T. Iwaszczuk, Krzysztof Zhang, X.-C. Jepsen, Peter Uhd Article Nonlinear spectroscopic investigation in the terahertz (THz) range requires significant field strength of the light fields. It is still a challenge to obtain the required field strengths in free space from table-top laser systems at sufficiently high repetition rates to enable quantitative nonlinear spectroscopy. It is well known that local enhancement of the THz field can be obtained for instance in narrow apertures in metallic films. Here we show by simulation, analytical modelling and experiment that the achievable field enhancement in a two-dimensional array of slits with micrometer dimensions in a metallic film can be increased by at least 60% compared to the enhancement in an isolated slit. The additional enhancement is obtained by optimized plasmonic coupling between the lattice modes and the resonance of the individual slits. Our results indicate a viable route to sensitive schemes for THz spectroscopy with slit arrays manufactured by standard UV photolithography, with local field strengths in the multi-ten-MV/cm range at kHz repetition rates, and tens of kV/cm at oscillator repetition rates. Nature Publishing Group 2016-11-25 /pmc/articles/PMC5123578/ /pubmed/27886232 http://dx.doi.org/10.1038/srep37738 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Klarskov, Pernille Tarekegne, Abebe T. Iwaszczuk, Krzysztof Zhang, X.-C. Jepsen, Peter Uhd
spellingShingle	Klarskov, Pernille Tarekegne, Abebe T. Iwaszczuk, Krzysztof Zhang, X.-C. Jepsen, Peter Uhd Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
author_facet	Klarskov, Pernille Tarekegne, Abebe T. Iwaszczuk, Krzysztof Zhang, X.-C. Jepsen, Peter Uhd
author_sort	Klarskov, Pernille
title	Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
title_short	Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
title_full	Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
title_fullStr	Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
title_full_unstemmed	Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
title_sort	amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays
description	Nonlinear spectroscopic investigation in the terahertz (THz) range requires significant field strength of the light fields. It is still a challenge to obtain the required field strengths in free space from table-top laser systems at sufficiently high repetition rates to enable quantitative nonlinear spectroscopy. It is well known that local enhancement of the THz field can be obtained for instance in narrow apertures in metallic films. Here we show by simulation, analytical modelling and experiment that the achievable field enhancement in a two-dimensional array of slits with micrometer dimensions in a metallic film can be increased by at least 60% compared to the enhancement in an isolated slit. The additional enhancement is obtained by optimized plasmonic coupling between the lattice modes and the resonance of the individual slits. Our results indicate a viable route to sensitive schemes for THz spectroscopy with slit arrays manufactured by standard UV photolithography, with local field strengths in the multi-ten-MV/cm range at kHz repetition rates, and tens of kV/cm at oscillator repetition rates.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5123578/
_version_	1613741787405352960

Amplification of resonant field enhancement by plasmonic lattice coupling in metallic slit arrays

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