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Journal of Nanophotonics

Sensitivity of optical reflectance to the deposition of plasmonic nanoparticles and limits of detection
Author(s): Omar W. Vázquez-Estrada; Gesuri Morales-Luna; Alejandro Reyes-Coronado; Alipio Calles-Martínez; Augusto García-Valenzuela
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Paper Abstract

We studied the limits of optical reflectance to detect plasmonic nanoparticles (NPs) embedded in air and supported by a glass substrate, in an internal reflection configuration. We used a recently derived multiple-scattering model for the coherent reflectance of a disordered monolayer of particles supported on a flat surface to calculate the sensitivity of optical reflectance variations to the presence of plasmonic NPs. We considered gold and silver NPs with radii up to 50 nm and studied the sensitivity as a function of the angle of incidence, wavelength, particle size, and polarization of light. Using our own measurements of noise, we estimated the minimum detectable surface-coverage by the particles. The highest sensitivity is found around the critical angle between the glass substrate and air, for transverse-magnetic polarization, and at wavelengths of light near the plasmon resonance of the particles. We provide estimates of the minimum number of particles per unit area detectable from reflectivity variations and set the basis for single particle detection.

Paper Details

Date Published: 23 May 2016
PDF: 14 pages
J. Nanophoton. 10(2) 026019 doi: 10.1117/1.JNP.10.026019
Published in: Journal of Nanophotonics Volume 10, Issue 2
Show Author Affiliations
Omar W. Vázquez-Estrada, Ctr. de Ciencias Aplicadas y Desarrollo Tecnológico (Mexico)
Gesuri Morales-Luna, Ctr. de Ciencias Aplicadas y Desarrollo Tecnológico (Mexico)
Alejandro Reyes-Coronado, Univ. Nacional Autónoma de México (Mexico)
Alipio Calles-Martínez, Univ. Nacional Autónoma de México (Mexico)
Augusto García-Valenzuela, Ctr. de Ciencias Aplicadas y Desarrollo Tecnológico (Mexico)

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