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Surface Plasmon Spectral Fingerprinting of Adsorbed Magnesium Phthalocyanine by Angle and Wavelength Modulation

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Abstract:

A novel instrumental method for angle and wavelength modulated surface plasmon resonance (SPR) spectroscopy is applied to the problem of spectral selectivity in SPR experiments. For transparent analytes, SPR reflectivity data are reduced to a two-dimensional (2D) spectrum of resonance wavelength versus incident angle, λSPR(). This spectrum encodes the refractive index (RI) dispersion of the analyte and illustrates the increased SPR spectral shift per unit RI change at longer wavelengths (lower angle). For the absorbing analyte magnesium phthalocyanine (MgPc), the 2D data reduction method is complicated by the way the SPR and MgPc-based spectral peaks mix. Fresnel reflectivity models support experimental observations of spectral branching and qualitative fingerprints in the form of branched spectra, and difference reflectivity ΔR(λ, ) contour plots are presented.

Keywords: MAGNESIUM PHTHALOCYANINE; REFRACTIVE INDEX DISPERSION; SURFACE PLASMON RESONANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370204322729414

Affiliations: Department of Chemistry, San Jose State University, One Washington Square, San Jose, California, 95192-0101

Publication date: January 1, 2004

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