16 March 2015 Optical properties of MgF2 nano-composite films dispersed with noble metal nanoparticles synthesized by sol-gel method
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Proceedings Volume 9359, Optical Components and Materials XII; 93590A (2015) https://doi.org/10.1117/12.2077045
Event: SPIE OPTO, 2015, San Francisco, California, United States
Abstract
Porous MgF2 films synthesized by a sol-gel method exhibit the lowest refractive index among the dielectric optical materials and are the most useful materials for the anti-reflection coatings. On the other hand, surface plasmon resonance (SPR) absorptions of noble metal nanoparticles in various solid matrices have been extensively studied. New functional materials like a SERS (Surface Enhanced Raman Spectroscopy) tips are expected by synthesizing composite materials between porous MgF2 films featured by the network of MgF2 nanoparticles and noble metal nanoparticles introduced within the network. In this study, fundamental physical properties including morphology and optical properties are characterized for these materials to make clear the potential of the composite system. Composite materials of MgF2 films dispersed with noble metal (Ag, Au) nanoparticles were prepared using the sol-gel technique with various annealing temperatures and densities of noble metal nanoparticles. The structural morphology was analyzed by an X-ray diffractometer (XRD) and a scanning electron microscope (SEM). The size and shape distributions of the metal nanoparticles were observed using a transmission electron microscope (TEM). The optical properties of fabricated composite films were characterized by UV-Vis-NIR and FT-IR spectrophotometers. The absorption spectra due to the surface plasmon resonance (SPR) of the metal nanoparticles were analyzed using the dielectric function considering the effective medium approximation, typically Maxwell-Garnett model. The Raman scattering spectra were also studied to check the enhancement effect of specimen dropped on the MgF2: Ag nano-composite films deposited on Si substrate. Enhancement of the Raman intensity of pyridine solution specimen was observed.
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Moriaki Wakaki, Nobuaki Soujima, Takehisa Shibuya, "Optical properties of MgF2 nano-composite films dispersed with noble metal nanoparticles synthesized by sol-gel method", Proc. SPIE 9359, Optical Components and Materials XII, 93590A (16 March 2015); doi: 10.1117/12.2077045; https://doi.org/10.1117/12.2077045
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