Journal
APPLIED SCIENCES-BASEL
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/app11073072
Keywords
Au-Ag NPs; saturated absorption; reverse saturation absorption; FDTD
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Funding
- natural science fund of Heilongjiang Province [F2018027, LH2020F041]
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Experimental results show that Au-Ag nanoparticles exhibit saturated absorption and reverse saturation absorption under different laser intensities. The transition between these two absorption states is explained by the local surface plasmon resonance effect, bleaching of ground state plasmon, and free carrier absorption theory.
The nonlinear optical absorption properties of Au-Ag nanoparticles (NPs) were studied using an open-aperture Z-scan under a nanosecond pulsed laser with wavelengths of 450 nm, 510 nm, 550 nm, and 600 nm. The experimental results demonstrated that, when the laser intensity was 1.04 x 10(13) W/m(2), the Au-Ag NPs showed saturated absorption (SA). When the laser intensity was increased to 3.03 x 10(13) W/m(2), the switch from SA to reverse saturation absorption (RSA) occurred. The nonlinear absorption and its transformation were analyzed by using local surface plasmon resonance (LSPR) effect, bleaching of ground state plasmon, and free carrier absorption theory.
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