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Here, we report a single\u2010band guided\u2010mode resonance (GMR) InGaAs photodetector (PD) array that enables single\u2010snapshot multispectral sensing through direct readout from each pixel. The device consists of an InGaAs PD with an ultrathin absorption layer bonded onto a Si 2D grating. Although a 2D crossed\u2010grating provides polarization independence, it inherently supports many more optical modes than a 1D grating. To realize a single\u2010band response, we introduce design strategies that suppress higher\u2010order diffraction using a thin grating and eliminate undesired modes by positioning their diffraction angles near the critical angle. The device exhibited a single\u2010band spectral response over a broad wavelength range of 1100\u20131700\u00a0nm, peak responsivities of up to 0.451\u00a0A\/W, off\u2010peak responsivities below 0.03\u00a0A\/W, and complete polarization independence. Moreover, a multispectral pixel array can be fabricated using a single patterning step by varying the grating period. We verified the feasibility of snapshot multispectral sensing through area\u2010scan imaging measurements under various input conditions. These results, together with the fabrication simplicity, establish the proposed device as a promising platform for compact, real\u2010time SWIR multispectral sensors.<\/jats:p>","DOI":"10.1002\/nap2.70297","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T08:52:54Z","timestamp":1789980774000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Polarization\u2010Independent Single\u2010Band Guided\u2010Mode Resonance InGaAs Photodetector Array for Snapshot Multispectral Sensing"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-4730-1453","authenticated-orcid":false,"given":"Junho","family":"Jang","sequence":"first","affiliation":[{"name":"School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST)  Daejeon Republic of 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