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Recent advancements in miniaturized spectroscopic systems have dramatically reduced the size of spectral encoding units, rendering them increasingly compatible with field\u2010deployable, wearable, and customer platforms. However, the miniaturization of spectral encoding units is often accompanied by the deterioration of manufacturability, stability, and operational bandwidth. Here, we present a single\u2010step approach to inscribe spectral response pixels in lithium niobate crystals. By employing ultrafast laser\u2010induced pixelated amorphous phase transition in birefringent substrates, we achieve localized frequency\u2010dependent optical modulation, generating dispersion signals at the microscale. These pixels function over a broad bandwidth (400\u20131550\u00a0nm), occupy an ultra\u2010compact footprint (5 \u00d7 5 \u00b5m\n                    <jats:sup>2<\/jats:sup>\n                    ), and are viewing angle independent, offering rich, varied spectral responses for efficient sampling. They also exhibit considerable stability against harsh conditions. We demonstrate their potential in precise spectral detection and liveness recognition applications, paving the way for versatile, affordable, and robust micro\u2010spectroscopic devices.\n                  <\/jats:p>","DOI":"10.1002\/adma.74336","type":"journal-article","created":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T13:37:25Z","timestamp":1785418645000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Spectral Response Pixels in Lithium Niobate for Spectroscopic Applications"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-0423-8004","authenticated-orcid":false,"given":"Fanrong","family":"Zeng","sequence":"first","affiliation":[{"name":"State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1076-072X","authenticated-orcid":false,"given":"Zhuo","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiqi","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-9215-0737","authenticated-orcid":false,"given":"Rongze","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3148-2500","authenticated-orcid":false,"given":"Jianrong","family":"Qiu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7844-4977","authenticated-orcid":false,"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,7,30]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.ady6571"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010025\u201009591\u2010x"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41551\u2010019\u20100435\u2010y"},{"key":"e_1_2_13_5_1","doi-asserted-by":"publisher","DOI":"10.3390\/rs12162659"},{"key":"e_1_2_13_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11947\u2010011\u20100725\u20101"},{"key":"e_1_2_13_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2009.185"},{"key":"e_1_2_13_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41928\u2010026\u201001618\u2010z"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abe0722"},{"key":"e_1_2_13_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/advs.202404448"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41377\u2010022\u201000853\u20101"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.1186\/s43593-025-00101-0"},{"key":"e_1_2_13_13_1","doi-asserted-by":"publisher","DOI":"10.1186\/s43593\u2010023\u201000041\u20107"},{"key":"e_1_2_13_14_1","doi-asserted-by":"publisher","DOI":"10.1364\/PRJ.7.000961"},{"key":"e_1_2_13_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010019\u201008994\u20105"},{"key":"e_1_2_13_16_1","doi-asserted-by":"publisher","DOI":"10.1364\/OE.432831"},{"key":"e_1_2_13_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.nanolett.4c01075"},{"key":"e_1_2_13_18_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586\u2010024\u201008109\u20101"},{"key":"e_1_2_13_19_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature14576"},{"key":"e_1_2_13_20_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41563\u2010023\u201001710\u20101"},{"key":"e_1_2_13_21_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adr7155"},{"key":"e_1_2_13_22_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010018\u201006495\u20105"},{"key":"e_1_2_13_23_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41928\u2010024\u201001242\u20109"},{"key":"e_1_2_13_24_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.aax8814"},{"key":"e_1_2_13_25_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566-025-01754-6"},{"key":"e_1_2_13_26_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202515132"},{"key":"e_1_2_13_27_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41565\u2010024\u201001756\u20105"},{"key":"e_1_2_13_28_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.add8544"},{"key":"e_1_2_13_29_1","doi-asserted-by":"publisher","DOI":"10.1126\/sciadv.adu4225"},{"key":"e_1_2_13_30_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010025\u201061317\u20109"},{"key":"e_1_2_13_31_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202303256"},{"key":"e_1_2_13_32_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrevb.48.15613"},{"key":"e_1_2_13_33_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-030-83624-5"},{"key":"e_1_2_13_34_1","doi-asserted-by":"publisher","DOI":"10.1109\/access.2014.2381273"},{"key":"e_1_2_13_35_1","doi-asserted-by":"publisher","DOI":"10.3390\/cells13070589"},{"key":"e_1_2_13_36_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.0022\u2010202x.2001.01577.x"},{"key":"e_1_2_13_37_1","doi-asserted-by":"publisher","DOI":"10.1088\/0967\u20103334\/28\/3\/R01"}],"container-title":["Advanced 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