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We report here the novel optical properties of naturally self-assembled hybrid organic-inorganic multiple quantum wells (OI-MQWs). These hybrids consist of a stack of alternative organic and inorganic nanolayers of widths ~ 6 and 10Aring respectively. They exhibit strong room temperature narrow exciton absorption and photoluminescence features due to quantum and dielectric confinements. The exciton...
Three-dimensionally nano-structured metal surfaces containing nano-scale voids produce strong localised plasmons. We show here the correlation between physical structure and photonic and electronic properties for several significant applications.
Reflectivity measurements of gold nanostructures graded in pitch and aperture size allow investigation of localized plasmons. A simple model confirmed by simulations explains the plasmon resonances. Such arrays are highly suitable Raman scattering substrates.
We demonstrate how the enhancement of SERS is correlated to the matching of localized plasmons at the pump laser wavelength, by designing and measuring a variety of nanostructured gold surfaces, showing both tuning and reproducibility.
We demonstrate how localized plasmons on nanostructured gold surfaces can be made to have two independently tuneable resonant wavelengths using anisotropic voids. This allows double resonance conditions for scattering (such as SERS) to be obtained.
By mapping optical absorption spectra from nanostructured plasmonic crystals coated with organic molecular J-aggregate films of cyanine dyes, strong coupling between J-aggregate excitons and two types of localized and delocalized plasmons is observed.
Correlation between anisotropic reflection and birefringence in glass irradiated with femtosecond pulses is observed. Direct evidence of self-induced nanogratings and form birefringence is obtained.
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