Chalcogenide glasses exhibit high optical nonlinearity and are widely used in developing various optical modulating devices. Due to the influence of coating processes and the properties of the glass material, the film thickness is one of the factors affecting the optical nonlinear coefficient of chalcogenide glass thin films. This paper presents the nonlinear optical characterization of chalcogenide glass Ge12Sb28Se60 thin films of various thicknesses. The measurements were conducted using the Z-scan method and the pump-probe method at a wavelength of 532 nm. The results demonstrated that as the film thickness increased from 25 nm to 200 nm, the nonlinear absorption of the material decreased from 1.1 × 10-6 m/W to 0.68 × 10-6 m/W. This trend will become more gradual as the film thickness increased. This means that the chalcogenide glass on the surface of the film has greater optical nonlinearity.
In this paper, we proposed a multilayer Metamaterial Absorber (MA) to enhance the up-conversion emission, which consists of silver grating, Up Conversion Nanoparticles (UCNPs) and silver film. Numerical and theoretical analysis results showed that tremendous up conversion enhancement is achieved at three wavelengths due to the surface plasmon resonance. Moreover, it was found that the interaction between the silver grating and the silver film is critical to the up-conversion enhancement. Tuning the thickness of the silver grating, the maximum enhanced factor (EFups) of 980 nm is 4 6.5 104. This metamaterial absorber provided a novel approach in enhancing up conversion, and the research findings could be helpful to the design of biosensor and photovoltaic devices.
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