Optimization of interference filters with genetic algorithms applied to silver-based heat mirrors

Abstract

In the optimization of multilayer stacks for various optical filtering purposes not only the thicknesses of the thin films are to be optimized, but also the sequence of materials. Materials with very different optical properties, such as metals and dielectrics, may be combined. A genetic algorithm is introduced to search for the optimal sequence of materials along with their optical thicknesses. This procedure is applied to a heat mirror in combination with a blackbody absorber for thermal solar energy applications at elevated temperatures (250 °C). The heat mirror is based on silver films with antireflective dielectric layers. Seven dielectrics have been considered. For a five-layer stack the sequence (TiO(2)/Ag/TiO(2)/Ag/Y(2)O(3)) is found to be optimal.

Enhanced Photoelectrochemical Activity of the TiO2/ITO Nanocomposites Grown onto Single‐Walled Carbon Nanotubes at a Low Temperature by Nanocluster Deposition

“…TiO 2 thin fi lms are used for antirefl ection coatings, optical interference fi lters, and optical waveguides. [1][2][3] Moreover, they also exhibit interesting photoelectrochemical properties [4][5][6][7] in dye-sensitized solar cells [ 8 , 9 ] and sensor arrays. [ 10 , 11 ] When oxide is deposited onto single-walled carbon nanotubes (SWCNTs), it produces a photodiode effect.…”

Optical Effect of Surface Morphology of Ag on Multilayer Electrode Applications for OLEDs

“…The optical characteristics of the DMD electrode are mainly related to the dielectric thickness. A specific phase condition for an antireflection coating can be satisfied by adjusting the thickness of the dielectric layer [2]. Therefore, the DMD electrode has the highest optical transmission at a certain thickness of the dielectric [3].…”

Synthesis, characterization and optical behaviour of vapour grown nano-crystalline Al–Cr–Fe–Mo thin films

“…For instance, their low adhesion, high hardness, excellent corrosion resistance and reduced optical conductivity at low frequencies make them very attractive for forming films on substrates [12][13][14][15][16]. Indeed, optical properties of quasicrystalline matter, and approximant phases compared to the one of the metallic constituents, exhibit an important absorption (40% in infrared domain) [14,[17][18][19][20]. This ability could be exploited for making infrared absorbers.…”