Applied Physics Letters· 2026Q1
Tunable thermochromism of VO2 on SiO2/Si in the visible region
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- 2026year
Short summary
Insulating VO2 on SiO2/Si substrates can be colored in the visible spectrum, with colors tunable by VO2 thickness and changing sharply across the thermal phase transition due to Fabry-Pérot interference.
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Key points
- VO2 on SiO2/Si substrates shows visible coloration, unlike typical VO2.
- Visible color is tunable by varying VO2 film thickness.
- Color changes sharply across the VO2 thermal phase transition.
- Fabry-Pérot interference is identified as the mechanism for visible thermochromism.
AI-generated from the title and abstract; the full text is not read.
Abstract
Vanadium dioxide (VO2) undergoes an insulator-to-metal phase transition above room temperature, across which the optical transmittance changes dramatically in the infrared region. In contrast, the transmittance modulation in the visible region is limited. Thus, VO2 exhibits visible transparency in both the insulating and metallic phases. Here, we show that insulating VO2 supported on SiO2/Si substrates can be colored, with the color varying widely with VO2 thickness. The color of a VO2/SiO2/Si heterostructure was observed to change sharply across the thermal phase transition. The observed color modulation can be well reproduced by numerical calculations based on the multiple-reflection model, suggesting that the Fabry–Pérot interference effect contributes to the visible thermochromism. Our results would expand the possibility of thermochromic applications of VO2 in the visible region.
The authors' abstract, as published at the source. Applied Physics Letters, 2026 · DOI ↗
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Field: Polymers and Plastics
Polymers and PlasticsMaterials Science