Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry

Excitation of localized via extended plasmons was shown recently to reveal ultrahigh electromagnetic field (EM) enhancement when optimum coupling is obtained in the prism configuration. Using grating coupling, one expects several advantages over the prism scheme such as being planar, more compact, a...

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Main Authors: Mohammad Abutoama, Li, Shuzhou, Ibrahim Abdulhalim
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/141570
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1415702020-06-09T05:26:13Z Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry Mohammad Abutoama Li, Shuzhou Ibrahim Abdulhalim School of Materials Science and Engineering Engineering::Materials Thickness Quantum Mechanics Excitation of localized via extended plasmons was shown recently to reveal ultrahigh electromagnetic field (EM) enhancement when optimum coupling is obtained in the prism configuration. Using grating coupling, one expects several advantages over the prism scheme such as being planar, more compact, and most important the possibility of tuning the spectral range over which the enhancement occurs. In this work we show that via gratings coupling the EM field enhancement can be up to 3 orders of magnitude higher than that obtained using free space excitation of localized surface plasmons (LSPs). Furthermore, the spectral range over which the ultrahigh enhancement achieved becomes wider by tuning the grating parameters. The cavity resonances generated by thick enough gratings couple to the LSPs producing ultrahigh local enhancement and play an important role in widening the spectral range to cover the range 400–2000 nm. This is important for solar energy harvesting and improving the efficiency of infrared optoelectronic devices. Having the periodic NPs arrangement on top of the grating was found to be very significant not only under transverse magnetic (TM) polarization but also under transverse electric (TE) polarization, thus reducing the dependence on the polarization. NRF (Natl Research Foundation, S’pore) 2020-06-09T05:26:13Z 2020-06-09T05:26:13Z 2017 Journal Article Mohammad Abutoama, Li, S., & Ibrahim Abdulhalim. (2017). Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry. The Journal of Physical Chemistry C, 121(49), 27612-27623. doi:10.1021/acs.jpcc.7b09756 1932-7447 https://hdl.handle.net/10356/141570 10.1021/acs.jpcc.7b09756 2-s2.0-85038380324 49 121 27612 27623 en The Journal of Physical Chemistry C © 2017 American Chemical Society. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Materials
Thickness
Quantum Mechanics
spellingShingle Engineering::Materials
Thickness
Quantum Mechanics
Mohammad Abutoama
Li, Shuzhou
Ibrahim Abdulhalim
Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
description Excitation of localized via extended plasmons was shown recently to reveal ultrahigh electromagnetic field (EM) enhancement when optimum coupling is obtained in the prism configuration. Using grating coupling, one expects several advantages over the prism scheme such as being planar, more compact, and most important the possibility of tuning the spectral range over which the enhancement occurs. In this work we show that via gratings coupling the EM field enhancement can be up to 3 orders of magnitude higher than that obtained using free space excitation of localized surface plasmons (LSPs). Furthermore, the spectral range over which the ultrahigh enhancement achieved becomes wider by tuning the grating parameters. The cavity resonances generated by thick enough gratings couple to the LSPs producing ultrahigh local enhancement and play an important role in widening the spectral range to cover the range 400–2000 nm. This is important for solar energy harvesting and improving the efficiency of infrared optoelectronic devices. Having the periodic NPs arrangement on top of the grating was found to be very significant not only under transverse magnetic (TM) polarization but also under transverse electric (TE) polarization, thus reducing the dependence on the polarization.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Mohammad Abutoama
Li, Shuzhou
Ibrahim Abdulhalim
format Article
author Mohammad Abutoama
Li, Shuzhou
Ibrahim Abdulhalim
author_sort Mohammad Abutoama
title Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
title_short Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
title_full Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
title_fullStr Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
title_full_unstemmed Widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
title_sort widening the spectral range of ultrahigh field enhancement by efficient coupling of localized to extended plasmons and cavity resonances in grating geometry
publishDate 2020
url https://hdl.handle.net/10356/141570
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