Novel optical materials based on oxide hydrate/poly(vinyl alcohol) hybrids are presented that have a readily tunable refractive index and can be solution-processed into photonic structures, including dielectric mirrors, gratings, and beyond. In planar microcavities, strong light–matter coupling is achieved at the target excitation. The agreement between classical electrodynamic simulations of the microcavity response and the experimental data demonstrates that the entire microcavity stack can be controllably produced as designed. Because of the versatility of the hybrid material used in these microcavities as high refractive index material, structures with a wide spectral range of optical modes might be designed and produced with straightforward coating methodologies, enabling fine-tuning of the energy and lifetime of the microcavities‘ optical modes to harness strong light–matter coupling in a wide variety of solution processable active materials.
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