We designed and fabricated highly reflective polymer-based chirped mirrors for thermal management using a titanium oxide hydrate/poly(vinyl alcohol) hybrid as the high-refractive-index material and a commodity polymer as the low-refractive-index material. Typically, chirped reflectors are fabricated using inorganic dielectrics incompatible with large-area and flexible applications. All-organic alternatives suffer from a small refractive index contrast between layers, limiting reflectivity. By employing this inorganic/organic hybrid material with a tunable refractive index (1.5-2.1), we accomplish a large enough refractive index contrast with commodity polymers and contribute towards making these photonic structures more readily accessible for heat management purposes.
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