title: Anti-counterfeiting patterns encrypted with multi-mode luminescent nanotaggants.
abstract: Anti-counterfeiting patterns are encrypted with nanotaggants that are selectively excited at distinct wavelengths. Decryption is realized by examining the temporal color or graphic responses of the pattern under various illumination wavelengths. The covert color and graphic codes that are designable through control of the nanotaggant composition are expected to provide high-level security.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China. fwang24@cityu.edu.hk.
authors.forename: Tianying
authors.initials: T
authors.lastname: Sun
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China. pengshi@cityu.edu.hk.
authors.forename: Bingzhe
authors.initials: B
authors.lastname: Xu
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China. fwang24@cityu.edu.hk.
authors.forename: Bing
authors.initials: B
authors.lastname: Chen
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China. fwang24@cityu.edu.hk.
authors.forename: Xian
authors.initials: X
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China. limy@zju.edu.cn.
authors.forename: Mingyu
authors.initials: M
authors.lastname: Li
authors.affiliation: Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China. pengshi@cityu.edu.hk.
authors.forename: Peng
authors.initials: P
authors.lastname: Shi
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China. fwang24@cityu.edu.hk and City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China.
authors.forename: Feng
authors.identifier: http://orcid.org/0000-0001-9471-4386
authors.initials: F
authors.lastname: Wang