Temperature assisted reflection control using VO₂/Si core-shell nanoparticles

Abstract

Vanadium dioxide (VO2) has attracted interest due to its phase transition from the insulating to the metallic states for potential use in a variety of optical and photonic applications. Here, we propose a VO2/Si core-shell structure to improve switching in band-selective reflection properties of the composite. Mie scattering formulation is used to analyze the structure before and after phase transition to show the impact of resonance quality on the mid-infrared light back-scattering. After investigating the effect of various VO2 nano-sphere radius sizes in both phases on light reflectivity, a VO2/Si core-shell structure is proposed to boost reflectivity and improve light controllability. Randomly distributed nanoparticles are studied to illustrate how these composites have similar behavior to their deterministic-distributed counterpart. Our results indicate that up to two-thirds of incident light power can be controlled by embedding proper core-shells in a polymer host material.

Using Thin Films of Phase-Change Material for Active Tuning of Terahertz Waves Scattering on Dielectric Cylinders

“…Making such scatterer actively tunable or switchable opens a new avenue towards significant reinforcement of functional capability [ 37 , 42 , 43 , 44 ]. This remains true regarding the (structures containing) core–shell scatterers with components [ 45 , 46 , 47 ]. However, tunable materials are unavoidably lossy, which may make a desired functionality impossible, so that the sophisticated ways to their incorporation and, therefore, advanced designs are often needed to mitigate it.…”

Bioinspired Temperature-Adaptive Thermal Management Membrane Based on Reversible Thermochromic Fibers for All-Season Thermal Regulation

“…38 Inorganic thermochromic materials typically exhibit reversible thermochromic behavior at high temperatures (70−500 °C), which is unsuitable for thermal management applications involving humans. 39 Liquid crystals and leucodiamers are two typical organic thermochromic materials. Since liquid crystals are usually costly and exhibit weak color-changing effect, their practical applications are greatly limited.…”

“…Typically, reversible thermochromic materials achieve color-changing through temperature-responsive structural changes, leading to changes in optical properties and enabling intelligent dual-mode thermal management. − Reversible thermochromic materials can be broadly classified into inorganic and organic categories . Inorganic thermochromic materials typically exhibit reversible thermochromic behavior at high temperatures (70–500 °C), which is unsuitable for thermal management applications involving humans . Liquid crystals and leucodiamers are two typical organic thermochromic materials.…”

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

“…Compared to the other kinds of PCMs, vanadium dioxide (VO 2 ) has successfully attracted the attention of many researchers. This is due to its ability to transition from an insulator monoclinic state to a metallic tetragonal rutile state at close to room temperature (68 °C) [ 25 , 26 , 27 ]. For VO 2 , this reversible insulator-to-metal phase transition is reached by applying the external agents that can be thermal, electrical and optical in nature [ 28 , 29 , 30 ].…”