Subwavelength Terahertz Imaging of Graphene Photoconductivity

[Image: see text] Using a spatially structured, optical pump pulse with a terahertz (THz) probe pulse, we are able to determine spatial variations of the ultrafast THz photoconductivity with subwavelength resolution (75 μm ≈ λ/5 at 0.8 THz) in a planar graphene sample. We compare our results to Rama...

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Autores principales: Hornett, Samuel M., Stantchev, Rayko I., Vardaki, Martha Z., Beckerleg, Chris, Hendry, Euan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2016
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5115732/
https://www.ncbi.nlm.nih.gov/pubmed/27736073
http://dx.doi.org/10.1021/acs.nanolett.6b03168
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author Hornett, Samuel M.
Stantchev, Rayko I.
Vardaki, Martha Z.
Beckerleg, Chris
Hendry, Euan
author_facet Hornett, Samuel M.
Stantchev, Rayko I.
Vardaki, Martha Z.
Beckerleg, Chris
Hendry, Euan
author_sort Hornett, Samuel M.
collection PubMed
description [Image: see text] Using a spatially structured, optical pump pulse with a terahertz (THz) probe pulse, we are able to determine spatial variations of the ultrafast THz photoconductivity with subwavelength resolution (75 μm ≈ λ/5 at 0.8 THz) in a planar graphene sample. We compare our results to Raman spectroscopy and correlate the existence of the spatial inhomogeneities between the two measurements. We find a strong correlation with inhomogeneity in electron density. This demonstrates the importance of eliminating inhomogeneities in doping density during CVD growth and fabrication for photoconductive devices.
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spelling pubmed-51157322016-11-21 Subwavelength Terahertz Imaging of Graphene Photoconductivity Hornett, Samuel M. Stantchev, Rayko I. Vardaki, Martha Z. Beckerleg, Chris Hendry, Euan Nano Lett [Image: see text] Using a spatially structured, optical pump pulse with a terahertz (THz) probe pulse, we are able to determine spatial variations of the ultrafast THz photoconductivity with subwavelength resolution (75 μm ≈ λ/5 at 0.8 THz) in a planar graphene sample. We compare our results to Raman spectroscopy and correlate the existence of the spatial inhomogeneities between the two measurements. We find a strong correlation with inhomogeneity in electron density. This demonstrates the importance of eliminating inhomogeneities in doping density during CVD growth and fabrication for photoconductive devices. American Chemical Society 2016-10-13 2016-11-09 /pmc/articles/PMC5115732/ /pubmed/27736073 http://dx.doi.org/10.1021/acs.nanolett.6b03168 Text en Copyright © 2016 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Hornett, Samuel M.
Stantchev, Rayko I.
Vardaki, Martha Z.
Beckerleg, Chris
Hendry, Euan
Subwavelength Terahertz Imaging of Graphene Photoconductivity
title Subwavelength Terahertz Imaging of Graphene Photoconductivity
title_full Subwavelength Terahertz Imaging of Graphene Photoconductivity
title_fullStr Subwavelength Terahertz Imaging of Graphene Photoconductivity
title_full_unstemmed Subwavelength Terahertz Imaging of Graphene Photoconductivity
title_short Subwavelength Terahertz Imaging of Graphene Photoconductivity
title_sort subwavelength terahertz imaging of graphene photoconductivity
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5115732/
https://www.ncbi.nlm.nih.gov/pubmed/27736073
http://dx.doi.org/10.1021/acs.nanolett.6b03168
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