Processes underlying the laser photochromic effect in colloidal plasmonic nanoparticle aggregates*
| Autor: | V. S. Gerasimov, A. P. Gavrilyuk, Sergei V. Karpov, I. L. Isaev, A. E. Ershov |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Absorption spectroscopy Physics::Optics General Physics and Astronomy Nanoparticle 02 engineering and technology Nanosecond 021001 nanoscience & nanotechnology Laser 01 natural sciences law.invention Chemical physics law Picosecond 0103 physical sciences Particle Irradiation Surface plasmon resonance 010306 general physics 0210 nano-technology |
| Zdroj: | Chinese Physics B. 29:037802 |
| ISSN: | 1674-1056 |
| Popis: | We have studied the dynamic and static processes occurring in disordered multiparticle colloidal Ag aggregates with natural structure and affecting their plasmonic absorption spectra under pico- and nanosecond pulsed laser radiations, as well as the physical origin responsible for these processes. We have shown that depending on the duration of the laser pulse, the mechanisms of laser modification of such aggregates can be associated both with changes in the resonant properties of the particles due to their heating and melting (picosecond irradiation mode) and with the particle shifts in the resonant domains of the aggregates (nanosecond pulses) which depend on the wavelength, intensity, and polarization of the radiation. These mechanisms result in formation of a narrow dip in the plasmonic absorption spectrum of the aggregates near the laser radiation wavelength and affect the shape and position of the dip. The effect of polydispersity of nanoparticle aggregates on laser photochromic reaction has been studied. |
| Databáze: | OpenAIRE |
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