Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4871507
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Funding
- Spanish Ministry of Economy and Competitiveness [MAT2009-14282-C02-01, TEC2011-22422, TEC2012-38901-C02-01]
- ERASMUS placement program
- CSIC-JAE predoctoral program
- European Social Fund
- Spanish Ministry of Science and Innovation
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We demonstrate that the broad surface plasmon resonance (SPR) of a single layer of near-coalescence silver nanoparticles (NPs), embedded in a dielectric matrix can be tailored by irradiation with a single nanosecond laser pulse into a distribution featuring a sharp resonance at 435 nm. Scanning electron microscopy studies reveal the underlying mechanism to be a transformation into a distribution of well-separated spherical particles. Additional exposure to multiple femtosecond laser pulses at 400 nm or 800 nm wavelength induces polarization anisotropy of the SPR, with a peak shift that increases with laser wavelength. The spectral changes are measured in-situ, employing reflection and transmission micro-spectroscopy with a lateral resolution of 4 mu m. Spectral maps as a continuous function of local fluence can be readily produced from a single spot. The results open exciting perspectives for dynamically tuning and switching the optical response of NP systems, paving the way for next-generation applications. (C) 2014 AIP Publishing LLC.
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