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However, recent polariton studies show that cavity linear response can encode nonlinear optical susceptibilities. Here, we demonstrate that this phenomenon is more general: emitter\u2013emitter interactions allow nonlinearities of individual emitters to emerge in the linear response of arrays, without cavities or permutational symmetry. To illustrate this phenomenon, we show linear spectra for coupled heterodimers and linear chains, and demonstrate that Raman features of individual monomers show up as vibrational sidebands of collective resonances. Moreover, tuning Raman\u2010type anharmonicities enables systematic control of spectral features, establishing a genuine quantum optical effect in molecular aggregates and quantum emitter arrays, which goes beyond mean\u2010field descriptions in light\u2010matter interactions.<\/jats:p>","DOI":"10.1002\/nap2.70252","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T08:58:27Z","timestamp":1787129907000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Hidden Optical Nonlinearities in Linear Spectra of Quantum Emitter Arrays"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-2726-9945","authenticated-orcid":false,"given":"Sricharan","family":"Raghavan\u2010Chitra","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arghadip","family":"Koner","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8701-8793","authenticated-orcid":false,"given":"Joel","family":"Yuen\u2010Zhou","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry University of California San Diego  La Jolla California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,19]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1103\/revmodphys.90.031002"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrevx.7.031024"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.7b00581"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0088855"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1103\/physreva.104.063504"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.3213013"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1039\/d0cp02255a"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1088\/2058\u20109565\/aa93b6"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.4979495"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jctc.7b00477"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpcc.9b05060"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpcb.0c05789"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2016.186"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1103\/revmodphys.73.565"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1103\/revmodphys.87.1379"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1039\/b711486a"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrevb.71.235420"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1088\/0953\u20104075\/48\/6\/065401"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1515\/nanoph\u20102012\u20100025"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1098\/rsif.2013.0901"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.0c01028"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsphotonics.6b00082"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpca.4c06320"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature07127"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1103\/revmodphys.82.2313"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41567\u2010024\u201002404\u20104"},{"key":"e_1_2_9_28_1","volume-title":"Principles of Nonlinear Optical Spectroscopy","author":"Mukamel S.","year":"1995"},{"key":"e_1_2_9_29_1","volume-title":"Classical Electrodynamics","author":"Jackson J. 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