Abstract
One-, two- or three-dimensional arrays of closely spaced silver nanoparticles may lead to new optical properties, due to short or long range coupling between their resonant surface plasmons, so that the spatially controlled growth of silver nanoparticles provides an efficient way to tune their optical properties. Towards this way, we present here the periodic pattern of a glass surface with silver nanoparticles by continuous ultraviolet laser exposure. The formation of the 160 nm period pattern is well described by an interference-based model which agrees with the experimental conclusions, mainly obtained by various forms of microscopy. Statistical approach based on the autocorrelation function gives quantitative description about the quality of the order in the periodic structure and about the nanoparticles averaged diameter (80 nm). We also present the optical extinction spectrum of the Laser Induced Periodic Surface Structure (LIPSS)-containing area of the glass, which unusually shows several bands in the visible range. The period of 160 nm of the periodic structure is short enough to allow coupling between nanoparticles, which makes it a possible candidate for plasmon-based optical applications.
Highlights
Soda-lime glasses doped with silver ions by the ion exchange technique were initially employed in the production of active or passive waveguiding systems [1]
One, two- or three-dimensional arrays of closely spaced silver nanoparticles may lead to new optical properties, due to short or long range coupling between their resonant surface plasmons, so that the spatially controlled growth of silver nanoparticles provides an efficient way to tune their optical properties
We present here the periodic pattern of a glass surface with silver nanoparticles by continuous ultraviolet laser exposure
Summary
Soda-lime glasses doped with silver ions by the ion exchange technique were initially employed in the production of active or passive waveguiding systems [1]. The optical properties of these composite glasses are mainly dominated by the Surface Plasmon Resonance (SPR) of the silver nanoparticles, responsible for an absorption band in the visible range, whose spectral position is affected by the surrounding dielectric matrix, the morphology (size and shape) and the spatial organization of the nanoparticles Such composite glasses are usually fabricated by several experimental ways, using a silver-exchanged soda-lime glass as starting material, submitted to various treatments to promote the formation of silver nanoparticles of controlled shape and size: thermal annealing into hydrogen atmosphere [4], ion irradiation [5] or irradiation by either pulsed or continuous wave (cw) laser exposure [6, 7].
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