Molybdenum trioxide: a key component in resonance effects for an optical reflection system

Abstract In this study, the coherent scattering model (CSM) and the iterated ray method (IRM) were applied to simulate the reflectance of a six-layer system composed of a BK7 prism, molybdenum trioxide film (MoO 3 ), gold nanoparticles (Au-NPs), water, a BK7 substrate, and air. Reflectance spectra were generated and compared for the two main phases of MoO 3 , α and β . The theoretical reflectance response was analyzed by systematically varying the wavelength of the incident light, the thickness of the MoO 3 film, and the surface coverage percentage of Au-NPs on the MoO 3 film for each phase. A pronounced plasmonic resonance effect was observed for the β phase of MoO 3 under specific monolayer thickness conditions.