AlN film-based Fabry-Perot cavity resonance enhanced absorption

摘要

The enhanced Fabry-Perot (F-P) resonance caused by adding a layer of AlN film to different metal substrates (AlN/metals) was analyzed by controlling the thickness of AlN film. The obtained results using the finite-difference time-domain (FDTD) method show that the absorption capacity of visible light was changed by the film interference effect. Then, the light absorption of Au/AlN/Fe (AAF) trilayer structures exhibits that the addition of the ultra-thin Au layer to the AlN/Fe surface improves the light absorption, the color gamut, and purity. Both the transfer-matrix theory and Fresnel-Airy equation were used to compare the FDTD simulations, the calculations show that all the results are consistent. Systematic analyses revealed that AlN film as an F-P resonant cavity is a promising strategy for optical applications, and AAF is an ideal structure in the applications to optical filters, no-ink printing, and optical anti-counterfeiting. (C) 2021 Society of Photo-Optical Instrumentation Engineers (SPIE)