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Surface plasmon microscopic sensing with beam profile modulation

Zhang, Bei; Pechprasarn, Suejit; Somekh, Michael G.

Authors

Bei Zhang

Suejit Pechprasarn

Michael G. Somekh

Abstract

Surface Plasmon microscopy enables measurement of local refractive index on a far finer scale than prism based systems. An interferometric or confocal system gives the so-called V(z) curve when the sample is scanned axially, which gives a measure of the surface plasmon propagation velocity. We show how a phase spatial light modulator (i) performs the necessary pupil function apodization (ii) imposes an angular varying phase shift that effectively changes sample defocus without any mechanical movement and (iii) changes the relative phase of the surface plasmon and reference beam to provide signal enhancement not possible with previous configurations.

Journal Article Type Article
Publication Date Dec 3, 2012
Journal Optics Express
Electronic ISSN 1094-4087
Publisher Optical Society of America
Peer Reviewed Peer Reviewed
Volume 20
Issue 27
Institution Citation Zhang, B., Pechprasarn, S., & Somekh, M. G. (2012). Surface plasmon microscopic sensing with beam profile modulation. Optics Express, 20(27), doi:10.1364/OE.20.028039
DOI https://doi.org/10.1364/OE.20.028039
Publisher URL http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-20-27-28039
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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