CONCLUSIONS Interesting reflectivity results are obtained for 20 nm and 50 nm nichrome alloy films which show a contrast reversal at 633 nm wavelength. The differences persist at longer wavelengths, 1320 nm and 1550 nm, although both films show reflection peaks at these wavelengths. While the results are modeled as SPR, interesting questions remain regarding the exact nature of the mode responsible for these peaks. Future work will focus on refining the model and investigating the transmittance data to gain insight regarding the nature of the mode in these films. REFERENCES 1. K. Kurihara and K. Suzuki, “Theoretical Understanding of an absorption-based surface plasmon sensor based on Kretchmann’s theory,” Anal Chem., 74, 696 -701, 2002. 2. E. Kretschmann & H. Raether, “Radiative Decay of nonradiative surface plasmons excited by light,” Z. Naturforsch, A23, 2135-2136, 1968. 3. H. J. Simon, D. E. Mitchell, J. G. Watson, “Surface Plasmons in silver films,” Am. J. Phys., vol. 43, (7), 630-636, 1975. 228
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