Triply surface-plasmon resonant four-wave mixing imaging of gold nanoparticles

Masia, Francesco ORCID: https://orcid.org/0000-0003-4958-410X, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, Watson, Peter Duncan ORCID: https://orcid.org/0000-0003-0250-7852 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314 2011. Triply surface-plasmon resonant four-wave mixing imaging of gold nanoparticles. Presented at: Plasmonics in Biology and Medicine VIII, San Francisco, CA, USA, 23-24 January 2011. Published in: Vo-Dinh, Tuan and Lakowicz, Joseph R. eds. Plasmonics in Biology and Medicine VIII. Proceedings of SPIE , vol.7911 S P I E - International Society for Optical Engineering, 79110Y. 10.1117/12.873883

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Abstract

We have developed a novel multiphoton microscopy technique not relying on (and hence not limited by) fluorescence emission, which exploits the third-order nonlinearity called four-wave mixing of gold nanoparticles in resonance with their surface Plasmon. The coherent, transient and resonant nature of this signal allows its detection free from backgrounds that limit other contrast methods for gold nanoparticles. We show detection of single 10nm gold nanoparticles with low excitation intensities, corresponding to negligible average thermal heating. Owing to the the third-order nonlinearity we measure a transversal and axial resolution of 140nm and 470nm respectively, better than the one-photon diffraction limit. We also show high-contrast imaging of gold-labels down to 5nm size in Golgi structures of HepG2 cells at useful imaging speeds (10 kHz pixel rate). Thermal dissociation of gold nanoparticles from their bonding sites when varying the excitation intensity is also investigated.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Biosciences Physics and Astronomy
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher:	S P I E - International Society for Optical Engineering
ISBN:	9780819484482
ISSN:	0277-786X
Funders:	EPSRC
Last Modified:	06 Nov 2022 13:04
URI:	https://orca.cardiff.ac.uk/id/eprint/26011

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