Research Papers

Sensitivity of optical reflectance to the deposition of plasmonic nanoparticles and limits of detection

[+] Author Affiliations
Omar Vázquez-Estrada, Gesuri Morales-Luna, Augusto García-Valenzuela

Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Apartado Postal 70-186, Ciudad de México 04510, México

Alejandro Reyes-Coronado, Alipio Calles-Martínez

Universidad Nacional Autónoma de México, Departamento de Física, Facultad de Ciencias, Ciudad Universitaria, Av. Universidad 3000, Ciudad de México 04510, México

J. Nanophoton. 10(2), 026019 (May 23, 2016). doi:10.1117/1.JNP.10.026019
History: Received December 3, 2015; Accepted April 18, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Omar Vázquez-Estrada ; Gesuri Morales-Luna ; Alejandro Reyes-Coronado ; Alipio Calles-Martínez and Augusto García-Valenzuela
"Sensitivity of optical reflectance to the deposition of plasmonic nanoparticles and limits of detection", J. Nanophoton. 10(2), 026019 (May 23, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.026019


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