Optical microresonator arrays of fluorescence-switchable diarylethenes with unreplicable spectral fingerprints
Optical microresonator arrays of fluorescence-switchable diarylethenes with unreplicable spectral fingerprints
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DOI：
10.1039/d0mh00566e
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发表时间：
2020-07-01
影响因子：
13.3
通讯作者：
Yamamoto, Yohei
中科院分区：
文献类型：
--
作者：
Okada, Daichi;Lin, Zhan-Hong;Yamamoto, Yohei
高安全性的身份识别需要难以伪造和复制的身份验证。对于防伪数据存储和可编程存储设备，可以采用变色材料，其中二色性颜色可以通过外部刺激来切换。如果在每个像素中嵌入更多的个人信息，则将实现超越零/一数据阵列的更高级别的安全系统。为此，来自微谐振器的精细回音壁模式（WGM）指纹图案是适用的。在这里，我们提出了由荧光光致变色有机材料制成的光开关光学微谐振器作为防伪，可重复的光学存储器。所得微球的WGM光致发光可以通过紫外光和可见光的照射反复打开和关闭。微谐振器的形状从球形到扁椭圆形和半球形变化，这取决于自组装过程，并且WGM光谱图案敏感地取决于谐振器的形态。此外，在疏水/亲水微图案化基底上的表面自组装提供了高度集成的微谐振器阵列，其密度为每平方厘米数百万像素。所有像素的光谱指纹彼此不同;因此，光可切换微阵列可用作难以复制的最终防伪系统。
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.