1. Tuning the effective dielectric function of thin film metal-dielectric composites by controlling the deposition temperature
- Author
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Jordi Sancho-Parramon, Hrvoje Zorc, and Vesna Janicki
- Subjects
010302 applied physics ,Materials science ,Physics ,Surface plasmon ,Physics::Optics ,02 engineering and technology ,Dielectric ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electron beam physical vapor deposition ,metal-dielectric composites ,metal island films ,surface plasmon resonance ,optical constants ,effective medium theory ,spectroscopic ellipsometry ,Electronic, Optical and Magnetic Materials ,Optical coating ,Vacuum deposition ,Ellipsometry ,0103 physical sciences ,Composite material ,Thin film ,0210 nano-technology ,Absorption (electromagnetic radiation) - Abstract
The influence of the substrate temperature on the effective optical behavior ofAg-SiO 2 composites obtained by electron beam evaporation was studied. Optical characteriza-tion of the composites was performed by means of spectroscopic ellipsometry measurements.Theeffectivedielectricfunctionofthecomposites,modeledusingamultipleoscillatorapproach,could be widely tuned by controlling the deposition temperature. The spectral dependence ofthe composite absorption appeared to be better described with a Gaussian line shape than withthe classical Lorentz oscillator model. The description of the effective dielectric function usingstandard effective medium theories failed and the experimental results could be explained onlyin the general framework of the Bergman spectral density theory. C 2011 Society of Photo-OpticalInstrumentation Engineers (SPIE) . [DOI: 10.1117/1.3590238] Keywords: metal-dielectric composites; metal island films; surface plasmon resonance; opticalconstants; effective medium theory; spectroscopic ellipsometry.Paper 11015SSR received Jan. 28, 2011; revised manuscript received Apr. 15, 2011; acceptedfor publication Apr. 15, 2011; published online May 13, 2011.
- Published
- 2011