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Here, we introduce cascaded cavity resonances to weakly correlate and control these two optical functionalities through vertically integrated layered and nanogap cavities. In this multiscale architecture, layered photonic cavities govern overt far\u2010field structural coloration, whereas localized plasmonic nanogap cavities generate covert stochastic optical scattering with minimal dependence on the overt optical appearance. The proposed architecture, consisting of a Cu mirror, HfO\n                    <jats:sub>2<\/jats:sub>\n                    dielectric layers, and disordered Cu nanoparticles, is fabricated entirely through a monolithic all\u2010vacuum deposition process. In particular, cooled glancing\u2010angle deposition suppresses nanoparticle coalescence during growth, enabling dense yet short\u2010range\u2010correlated nanoparticle assemblies with short nanoscale correlation lengths (\u223c44\u00a0nm) and high nominal stochastic encoding density exceeding 6.94\u00d710\n                    <jats:sup>7<\/jats:sup>\n                    bit\/mm\n                    <jats:sup>2<\/jats:sup>\n                    . Leveraging these properties, we realize wafer\u2010scale optical physical unclonable functions containing 22,500 independently encoded optical fingerprints together with rapid authentication and robust environmental stability. These results therefore demonstrate a scalable methodology to bridge deterministic nanophotonics and stochastic security media through precision multiscale resonance engineering.\n                  <\/jats:p>","DOI":"10.1002\/advs.77859","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T18:00:31Z","timestamp":1790532031000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Covert Optical Fingerprints Within Overt Structural Colors via Cascaded Cavity Resonances"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-2950-2258","authenticated-orcid":false,"given":"Gyurin","family":"Kim","sequence":"first","affiliation":[{"name":"Department of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology  Gwangju Republic of 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