Presence Of Plasmon Resonance Research Articles

Features of photoabsorption on "core-shell" nanoparticles in various matrices in the presence of plasmon resonances

Features of photoabsorption on "core-shell" nanoparticles in various matrices in the presence of plasmon resonances

The Effect of Localized Plasmons in Silver and Gold Thin Films on the Optical Properties of Organic Dyes in an Acrylate Polymer Matrix

We present the results of our investigation into the effect of localized surface plasmon resonances of gold and silver nanoparticles on the emissivity of two organic dyes—2-(4-(dimethylamino)styryl)-1-methylpyridinium and rhodamine B—in acrylate-based polymer matrices formed on the surface of island metal films by the UV lithography method. We show that the presence of plasmon resonances significantly enhances both the optical absorption and the fluorescence intensity of these organic dyes in polymer matrices.

Enhancement of the transversal magnetic optic Kerr effect: Lock-in vs. hysteresis method.

The lock-in amplifier is often used to study the enhancement of the magneto-optical Kerr effect (MOKE) in the presence of plasmon resonances. In the present work we show that it is possible to investigate such effect replacing the lock-in amplifier by a compensator, filter, and differential amplifier. This allows us to extract the full hysteresis loop in and out of the resonance without the need of a lock-in amplifier. Our results demonstrate these two setups are equivalent to study the enhancement of the transversal MOKE (T-MOKE) in magnetoplasmonic systems.

Synthesis and nonlinear optical properties of Lif films containing gold nanoparticles

We have studied the structure and optical properties of a thin lithium fluoride (LiF) film containing nanosized gold particles, which has been obtained by the thermal evaporation of LiF and Au followed by deposition onto the surface of a glass substrate heated to 590 K. Data of scanning electron microscopy and X-ray diffraction (XRD) showed that the composite film possesses a polycrystalline structure with an average LiF grain size of about 170 nm. The formation of gold nanoparticles in the film was confirmed both by XRD data and the presence of plasmon resonances in the optical absorption spectrum, which is close to the spectra obtained by model calculations for a LiF matrix with 20- to 40-nm-sized gold particles. Using the Z-scan technique, it is shown that the composite film exhibits nonlinear absorption of pulsed laser radiation with a wavelength of 780 nm and pulse duration of 150 fs at a power exceeding 100 mW. The magnitude of this effect is comparable to that observed previously for various single-crystalline matrices containing gold nanoparticles.