Cellulose-based photonic crystals are photonic crystals with cellulose and its derivatives as the main constituent materials,and their structures are usually composed of periodically arranged cellulose materials with different refractive indices or complexes of cellulose and other mate-rials,which enable effective control of the propagation characteristics of photons.The advantages of cellulose-based photonic crystals lie in the sustainability,biocompatibility and biodegradability of cellulose materials,which make them have a wide range of potential applications in the fields of biosensing,optical devices and chiral photonics.In recent years,cellulose nanocrystals(CNC)have attracted much attention in the prepara-tion and application of photonic crystals due to their fine nanostructures,excellent mechanical properties,low expansion coefficients,as well as excellent plasticity and adhesion.However,there is still insufficient discussion on the research progress of other types of cellulose-based photonic crystals.Starting from the types of cellulose-based photonic crystals,this paper first outlines their optical modulation mechanisms and preparation methods,and further clarifies the applications of different types of cellulose-based photonic crystals in sensor devices,optical anti-counterfeiting and other smart materials.It ends with a prospective discussion on the existing problems and future trends.
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