Unfolding the contents of sub-nm plasmonic gaps using normalising plasmon resonance spectroscopy.

Faraday Discussions
Bart de NijsJeremy J Baumberg

Abstract

Plasmonic coupling of gold nanoparticles to a gold surface creates intense plasmonic hot spots with large electromagnetic field-enhancements within the cavity formed by the two metallic surfaces. The localised field in such structures is extremely sensitive to morphological fluctuations and subtle changes in the dielectric properties of the cavity contents. Here, we present an optical method that pins down the properties of the gap contents with high sensitivity, termed normalising plasmon resonance (NPR) spectroscopy. We use this on a variety of ultrathin molecular spacers such as filled and empty cucurbiturils, and graphene. Clear differences in the spectral positions and intensities of plasmonic modes observed in the scattering spectrum resolve thickness differences of 0.1 nm, and refractive index changes from molecular filling.

References

Jul 23, 2004·The Journal of Chemical Physics·Encai Hao, George C Schatz
Jan 23, 2009·Nano Letters·Jorge ZuloagaPeter Nordlander
Nov 9, 2012·Nature·Kevin J SavageJeremy J Baumberg
Sep 26, 2013·Nano Letters·Jan MertensJeremy J Baumberg
Nov 6, 2013·Nano Letters·Richard W TaylorOren A Scherman
Aug 13, 2014·Scientific Reports·Richard W TaylorJeremy J Baumberg
Dec 11, 2014·Nano Letters·Felix BenzJeremy J Baumberg

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Citations

Sep 24, 2015·Advanced Materials·Tao DingJeremy J Baumberg
Jan 15, 2016·The Journal of Physical Chemistry Letters·Daniel O SigleOren A Scherman
Apr 15, 2016·ACS Photonics·Anna LombardiJeremy J Baumberg
Feb 3, 2016·Optics Express·Felix BenzJeremy J Baumberg
Nov 14, 2015·Chemical Reviews·Steven J BarrowOren A Scherman
May 26, 2016·The Journal of Physical Chemistry Letters·Felix BenzJeremy J Baumberg
Jun 15, 2016·Nature·Rohit ChikkaraddyJeremy J Baumberg
Aug 17, 2016·Nano Letters·J MertensJ J Baumberg
Dec 17, 2016·ACS Nano·Marie-Elena KleemannJeremy J Baumberg
Mar 8, 2017·Nano Letters·Jan MertensJeremy J Baumberg
Sep 22, 2017·Faraday Discussions·Bart de NijsOren A Scherman
Oct 24, 2017·Nature Communications·Bart de NijsJeremy J Baumberg
Jan 15, 2016·Faraday Discussions·Semen ChervinskiiAndrey A Lipovskii
Feb 6, 2020·Nature Communications·Cloudy CarnegieJeremy J Baumberg
Jan 17, 2020·Proceedings of the National Academy of Sciences of the United States of America·Matthew J HortonJeremy J Baumberg
Jun 17, 2020·Proceedings of the National Academy of Sciences of the United States of America·Marlous KampJeremy J Baumberg
Mar 7, 2019·Nature Communications·Oluwafemi S OjambatiJeremy J Baumberg
Nov 5, 2017·Nature Communications·Marie-Elena KleemannJeremy J Baumberg
Jul 29, 2017·Physical Review Letters·William M DeaconJeremy J Baumberg
Mar 13, 2021·Advances in Colloid and Interface Science·Benjamin Sierra-Martin, Antonio Fernandez-Barbero
Mar 20, 2020·The Journal of Physical Chemistry Letters·Matthew R CheethamRohit Chikkaraddy

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