首页|Non-volatile dynamically switchable color display via chalcogenide stepwise cavity resonators
Non-volatile dynamically switchable color display via chalcogenide stepwise cavity resonators
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High-resolution multi-color printing relies upon pixelated optical nanostructures,which is crucial to promote color display by producing nonbleaching colors,yet requires simplicity in fabrication and dynamic switching.Antimony trisulfide(Sb2S3)is a newly rising chalcogenide material that possesses prompt and significant transition of its optical characterist-ics in the visible region between amorphous and crystalline phases,which holds the key to color-varying devices.Herein,we proposed a dynamically switchable color printing method using Sb2S3-based stepwise pixelated Fabry-Pérot(FP)cavities with various cavity lengths.The device was fabricated by employing a direct laser patterning that is a less time-consuming,more approachable,and low-cost technique.As switching the state of Sb2S3 between amorphous and crys-talline,the multi-color of stepwise pixelated FP cavities can be actively changed.The color variation is due to the pro-found change in the refractive index of Sb2S3 over the visible spectrum during its phase transition.Moreover,we directly fabricated sub-50 nm nano-grating on ultrathin Sb2S3 laminate via microsphere 800-nm femtosecond laser irradiation in far field.The minimum feature size can be further decreased down to～45 nm(λ/17)by varying the thickness of Sb2S3 film.Ultrafast switchable Sb2S3 photonic devices can take one step toward the next generation of inkless erasable pa-pers or displays and enable information encryption,camouflaging surfaces,anticounterfeiting,etc.Importantly,our work explores the prospects of rapid and rewritable fabrication of periodic structures with nano-scale resolution and can serve as a guideline for further development of chalcogenide-based photonics components.
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