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説明:

Whispering-gallery-mode (WGM)-mediated light emission produces sharp and distinct resonant peaks, providing a unique spectral signature that is ideal for photonic barcoding and compact microtagging. However, existing photonic barcodes are typically limited to visible wavelengths, restricting their tagging potential. Achieving precise light-emission control across the entire Vis–near-IR (NIR) spectral range is challenging, particularly when using a single object composed of a single material. Herein, multicolor-emitting carbonized polymer microbeads (MECPMs) are synthesized on a gram scale by a facile and scalable hydrothermal process. These spherical microbeads, which contain extended π-conjugated polycyclic aromatic hydrocarbons within their microcavities, emit broadband light spanning the entire Vis–NIR spectrum. Owing to their excitation-dependent photoluminescence, a single MECPM can produce color-tunable WGM-based white-light emission across the Vis–NIR spectrum, thereby enabling the generation of both visible and invisible microbarcodes by adjusting the excitation wavelength. Compared with conventional polymer- or oxide-based microcavities, MECPMs demonstrate enhanced chemical stability in acids and organic solvents, excellent spectral tunability, and outstanding photonic encryption capabilities. Their environmentally friendly, metal-free “chameleonic” photonic functionality provides a robust platform for anticounterfeiting, microtagging, labeling, and next-generation photonic security systems. Additionally, this invention facilitates photonic encryption via information encoding and transmission across the Vis–NIR spectral range.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Microresonator, photoluminescence, near infrared, microbarcodes

刊行年月日: 2026-04-30

出版者: Wiley

掲載誌:

• Advanced Optical Materials (ISSN: 21951071) p. 14-19 e03855

研究助成金:

• JSPS 24K17589 (科研費)

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6497

公開URL: https://doi.org/10.1002/adom.202503855

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更新時刻: 2026-09-02 11:53:36 +0900

MDRでの公開時刻: 2026-09-02 14:28:30 +0900