Cargando…

Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation

In this paper, we present a direct method to measure surface wave attenuation arising from both ohmic and coupling losses using our recently developed phase spatial light modulator (phase-SLM) based confocal surface plasmon microscope. The measurement is carried out in the far-field using a phase-SL...

Descripción completa

Detalles Bibliográficos
Autores principales: Pechprasarn, Suejit, Chow, Terry W. K., Somekh, Michael G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5986803/
https://www.ncbi.nlm.nih.gov/pubmed/29867205
http://dx.doi.org/10.1038/s41598-018-26424-2
_version_ 1783328988090859520
author Pechprasarn, Suejit
Chow, Terry W. K.
Somekh, Michael G.
author_facet Pechprasarn, Suejit
Chow, Terry W. K.
Somekh, Michael G.
author_sort Pechprasarn, Suejit
collection PubMed
description In this paper, we present a direct method to measure surface wave attenuation arising from both ohmic and coupling losses using our recently developed phase spatial light modulator (phase-SLM) based confocal surface plasmon microscope. The measurement is carried out in the far-field using a phase-SLM to impose an artificial surface wave phase profile in the back focal plane (BFP) of a microscope objective. In other words, we effectively provide an artificially engineered backward surface wave by modulating the Goos Hänchen (GH) phase shift of the surface wave. Such waves with opposing phase and group velocities are well known in acoustics and electromagnetic metamaterials but usually require structured or layered surfaces, here the effective wave is produced externally in the microscope illumination path. Key features of the technique developed here are that it (i) is self-calibrating and (ii) can distinguish between attenuation arising from ohmic loss (k″(Ω)) and coupling (reradiation) loss (k″(c)). This latter feature has not been achieved with existing methods. In addition to providing a unique measurement the measurement occurs of over a localized region of a few microns. The results were then validated against the surface plasmons (SP) dip measurement in the BFP and a theoretical model based on a simplified Green’s function.
format Online
Article
Text
id pubmed-5986803
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-59868032018-06-07 Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation Pechprasarn, Suejit Chow, Terry W. K. Somekh, Michael G. Sci Rep Article In this paper, we present a direct method to measure surface wave attenuation arising from both ohmic and coupling losses using our recently developed phase spatial light modulator (phase-SLM) based confocal surface plasmon microscope. The measurement is carried out in the far-field using a phase-SLM to impose an artificial surface wave phase profile in the back focal plane (BFP) of a microscope objective. In other words, we effectively provide an artificially engineered backward surface wave by modulating the Goos Hänchen (GH) phase shift of the surface wave. Such waves with opposing phase and group velocities are well known in acoustics and electromagnetic metamaterials but usually require structured or layered surfaces, here the effective wave is produced externally in the microscope illumination path. Key features of the technique developed here are that it (i) is self-calibrating and (ii) can distinguish between attenuation arising from ohmic loss (k″(Ω)) and coupling (reradiation) loss (k″(c)). This latter feature has not been achieved with existing methods. In addition to providing a unique measurement the measurement occurs of over a localized region of a few microns. The results were then validated against the surface plasmons (SP) dip measurement in the BFP and a theoretical model based on a simplified Green’s function. Nature Publishing Group UK 2018-06-04 /pmc/articles/PMC5986803/ /pubmed/29867205 http://dx.doi.org/10.1038/s41598-018-26424-2 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
Pechprasarn, Suejit
Chow, Terry W. K.
Somekh, Michael G.
Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation
title Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation
title_full Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation
title_fullStr Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation
title_full_unstemmed Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation
title_short Application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by Goos-Hänchen phase shift modulation
title_sort application of confocal surface wave microscope to self-calibrated attenuation coefficient measurement by goos-hänchen phase shift modulation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5986803/
https://www.ncbi.nlm.nih.gov/pubmed/29867205
http://dx.doi.org/10.1038/s41598-018-26424-2
work_keys_str_mv AT pechprasarnsuejit applicationofconfocalsurfacewavemicroscopetoselfcalibratedattenuationcoefficientmeasurementbygooshanchenphaseshiftmodulation
AT chowterrywk applicationofconfocalsurfacewavemicroscopetoselfcalibratedattenuationcoefficientmeasurementbygooshanchenphaseshiftmodulation
AT somekhmichaelg applicationofconfocalsurfacewavemicroscopetoselfcalibratedattenuationcoefficientmeasurementbygooshanchenphaseshiftmodulation