We have investigated the contribution of localized surface plasmon polaritons (LSPPs) in silver nanoparticles with radii smaller than 20 nm to the photocurrent of ultrathin photosensitive devices based on amorphous silicon. An increased light absorption and an enhanced photocurrent are found for wavelengths between 600 nm and 1150 nm in presence of nanoparticles. As amorphous silicon absorbs light efficiently only at wavelengths up to 750 nm, the increased photocurrent in the near infrared range is explained in terms of LSPP-induced photoemission of electrons within and in close vicinity of the nanoparticles.
Measurements of Brillouin scattering spectra from liquid and glassy (300–600 °C, 25–130 °C) ZnCl2 are reported. High resolution Fabry–Perot spectroscopy has been used, and temperature as well as momentum transfer have been varied so as to go completely across the condition (Brillouin frequency)⋅(characteristic relaxation time)=1, where very non-Lorentzian spectral shapes are observed. They are fully described by viscoelastic theory, i.e., a Mori-form including fourth moment, two sound velocities, and relaxation times. Connection with current ideas on glass-forming liquids is made.
In this work, methods are introduced to the determination of optical properties of thin silver films and nanostructures. We present an optical resonant system consisting of a mirror, a transparent layer and a thin silver film. The layer sequences and the nanostructure of the thin films are investigated by optical methods consist of reflectance measurements. The structures are analyzed by atomic force microscopy and scanning electron microscopy. The optical properties are determined by modeling the reflectance data. We have found that the growth mechanisms of the silver layer are correlated to its optical properties. It also found that temperature treatments produce isolated particles with a narrow plasmon resonance.
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