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Express"],"published-print":{"date-parts":[[2026,10,5]]},"abstract":"<jats:p>\n                    Perfect light absorption under one-sided illumination in a conventional two-port planar photonic system typically requires either a reflecting element or a pair of degenerate resonances. In this study, we show that near-perfect light absorption can be achieved by exploiting a single critically coupled \u0393-point unidirectional guided resonance (UGR) in an all-dielectric zero-contrast grating (ZCG), without requiring either a reflecting element or a pair of degenerate resonances. Because downward radiation is suppressed, the ZCG effectively behaves as a one-port system, enabling near-perfect absorption (\u2265 99%) of normally incident light from the top, whereas light incident from the bottom is predominantly reflected. We present an analytical expression,\n                    <jats:italic>A<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    \u2009=\u2009\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>\u03b7<\/jats:italic>\n                    <\/jats:sub>\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>r<\/jats:italic>\n                    <\/jats:sub>\n                    , which separately quantifies the effects of radiation asymmetry\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>\u03b7<\/jats:italic>\n                    <\/jats:sub>\n                    and critical coupling\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>r<\/jats:italic>\n                    <\/jats:sub>\n                    on the maximum absorptance at resonance. This relation shows that near-perfect absorption can be maintained despite deviations from the ideal UGR condition, the exact critical-coupling condition, or both, provided that\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>\u03b7<\/jats:italic>\n                    <\/jats:sub>\n                    <jats:italic>F<\/jats:italic>\n                    <jats:sub>\n                      <jats:italic>r<\/jats:italic>\n                    <\/jats:sub>\n                    \u2009\u2265\u20090.99. This analytical prediction is confirmed by finite-element simulations. Our findings provide valuable insight for developing high-performance all-dielectric light absorbers based on UGRs for diverse optoelectronic applications.\n                  <\/jats:p>","DOI":"10.1364\/oe.614445","type":"journal-article","created":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T06:00:10Z","timestamp":1789538410000},"page":"37007","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Near-unity light absorption at normal incidence via a single critically coupled unidirectional guided resonance in all-dielectric zero-contrast gratings"],"prefix":"10.1364","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6316-8009","authenticated-orcid":true,"given":"Sun-Goo","family":"Lee","sequence":"first","affiliation":[{"name":"Kongju National University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wook-Jae","family":"Lee","sequence":"additional","affiliation":[{"name":"Kongju National University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"key":"oe-34-20-37007-R1","doi-asserted-by":"publisher","first-page":"2888","DOI":"10.1021\/acs.nanolett.8b05118","type":"journal-article","volume":"19","author":"Siday","year":"2019","journal-title":"Nano Lett."},{"key":"oe-34-20-37007-R2","doi-asserted-by":"publisher","first-page":"103","DOI":"10.1038\/s41467-021-27662-1","type":"journal-article","volume":"13","author":"Hakkel","year":"2022","journal-title":"Nat. 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