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White Light Generation and Anisotropic Damage in Gold Films near Percolation Threshold
journal contribution
posted on 2017-04-06, 00:00 authored by Sergey
M. Novikov, Christian Frydendahl, Jonas Beermann, Vladimir A. Zenin, Nicolas Stenger, Victor Coello, N. Asger Mortensen, Sergey I. BozhevolnyiStrongly
enhanced and confined electromagnetic fields generated
in metal nanostructures upon illumination are exploited in many emerging
technologies by either fabricating sophisticated nanostructures or
synthesizing colloid nanoparticles. Here we study effects driven by
field enhancement in vanishingly small gaps between gold islands in
thin films near the electrically determined percolation threshold.
Optical explorations using two-photon luminescence (TPL) and near-field
microscopies reveals supercubic TPL power dependencies with white-light
spectra, establishing unequivocally that the strongest TPL signals
are generated close to the percolation threshold films, and occurrence
of extremely confined (∼30 nm) and strongly enhanced (∼100
times) fields at the illumination wavelength. For linearly polarized
and sufficiently powerful light, we observe pronounced optical damage
with TPL images being sensitive to both wavelength and polarization
of illuminating light. We relate these effects to thermally induced
morphological changes observed with scanning electron microscopy images.
Exciting physics involved in light interaction with near-percolation
metal films along with their straightforward and scalable one-step
fabrication procedure promises a wide range of fascinating developments
and technological applications within diverse areas of modern nanotechnology,
from biomolecule optical sensing to ultradense optical data storage.
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near-field microscopiesnear-percolation metal filmsfield enhancementmetal nanostructureslight interactionfabrication procedurewhite-light spectradata storageTPL signalsExciting physicssynthesizing colloid nanoparticlesstudy effectsWhite Light GenerationPercolation Thresholdpercolation threshold filmsGold Filmstwo-photon luminescenceelectromagnetic fieldspercolation thresholdillumination wavelengthOptical explorationsAnisotropic DamageTPL imagessupercubic TPL power dependenciesgold islandsscanning electron microscopy images
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