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However, chiral HMHs that simultaneously deliver strong second\u2010harmonic generation (SHG) and pronounced nonlinear chiroptical responses remain limited. Herein, we report a pair of chiral hybrid copper(I) bromide microplates, (\n                    <jats:italic>R<\/jats:italic>\n                    \u2010 and\n                    <jats:italic>S<\/jats:italic>\n                    \u2010MPZ)Cu\n                    <jats:sub>2<\/jats:sub>\n                    Br\n                    <jats:sub>4<\/jats:sub>\n                    (MPZ\u00a0=\u00a02\u2010methylpiperazinediium), which crystallize in the noncentrosymmetric space group\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    and feature distinctive one\u2010dimensional zigzag chains constructed from three\u2010coordinate trigonal\u2013planar CuBr\n                    <jats:sub>3<\/jats:sub>\n                    units. Benefiting from the highly distorted Cu\u2500Br frameworks, the microplates exhibit an SHG intensity approximately 376 times that of Y\u2010cut quartz at 870\u00a0nm, together with a high laser damage threshold of up to 11.14\u00a0mJ\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . More importantly, the (\n                    <jats:italic>R<\/jats:italic>\n                    \u2010 and\n                    <jats:italic>S<\/jats:italic>\n                    \u2010MPZ)Cu\n                    <jats:sub>2<\/jats:sub>\n                    Br\n                    <jats:sub>4<\/jats:sub>\n                    microplates display effective SHG circular dichroism (SHG\u2010CD) and circularly polarized SHG responses, enabling a conceptual chirality\u2010encoded SHG tagging and decoding protocol. This work highlights chiral hybrid copper(I) halides as a versatile lead\u2010free platform for integrating efficient frequency conversion, nonlinear chiroptical functionality, and information encryption capabilities.\n                  <\/jats:p>","DOI":"10.1002\/anie.4724561","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T05:38:31Z","timestamp":1790055511000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Strong Second\u2010Order Nonlinear Optical Activities in Chiral Hybrid Copper(I) Bromide Microplates"],"prefix":"10.1002","author":[{"given":"Zhihang","family":"Guo","sequence":"first","affiliation":[{"name":"School of Science and Engineering The Chinese University of Hong Kong  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yujie","family":"Hong","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yecheng","family":"Leng","sequence":"additional","affiliation":[{"name":"School of Science and Engineering The Chinese University of Hong Kong  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8206-6166","authenticated-orcid":false,"given":"Wenguang","family":"Tu","sequence":"additional","affiliation":[{"name":"School of Science and Engineering The Chinese University of Hong Kong  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2496-4053","authenticated-orcid":false,"given":"Xi","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Science and Engineering The Chinese University of Hong Kong  Shenzhen Guangdong China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1040-0596","authenticated-orcid":false,"given":"Tingchao","family":"He","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University  Shenzhen 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