標題: Optical microresonator arrays of fluorescence-switchable diarylethenes with unreplicable spectral fingerprints
作者: Okada, Daichi
Lin, Zhan-Hong
Huang, Jer-Shing
Oki, Osamu
Morimoto, Masakazu
Liu, Xuying
Minari, Takeo
Ishii, Satoshi
Nagao, Tadaaki
Irie, Masahiro
Yamamoto, Yohei
電子物理學系
Department of Electrophysics
公開日期: 1-Jul-2020
摘要: High-security identification requires authentication that is hard to counterfeit and replicate. For anti-counterfeiting data storage and rewritable memory devices, chromic materials are adoptable, where the dichromatic colours can be switched by external stimuli. If further individual information is embedded in each pixel, a much higher-level security system beyond the zero/one data array will be realized. For this purpose, a fine whispering gallery mode (WGM) fingerprint pattern from a microresonator is applicable. Here we propose that photoswitchable optical microresonators made of a fluorescent photochromic organic material function as anti-counterfeiting, rewritable optical memories. The WGM photoluminescence of the resultant microspheres can be switched on and off repeatedly by irradiation with ultraviolet and visible light. The shape of the micro-resonator varies from a sphere to an oblate ellipsoid and hemisphere, depending on the self-assembly process, and the WGM spectral pattern depends sensitively on the morphology of the resonators. Furthermore, surface self-assembly on a hydrophobic/hydrophilic micropatterned substrate affords a highly integrated array of microresonators as dense as millions of pixels per square centimetre. The spectral fingerprints of all pixels are different from one another; therefore, the photoswitchable microarrays are applicable as an ultimate anti-counterfeiting system which is hard to replicate.
URI: http://dx.doi.org/10.1039/d0mh00566e
http://hdl.handle.net/11536/154824
ISSN: 2051-6347
DOI: 10.1039/d0mh00566e
期刊: MATERIALS HORIZONS
Volume: 7
Issue: 7
起始頁: 1801
結束頁: 1808
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