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Rev. Lett."],"accepted":{"date-parts":[[2026,7,20]]},"abstract":"<jats:p>\n                    Near-field enhancement in nanocavities governs the efficiency of nonlinear optical processes and ultrafast light-matter interactions. However, maximizing the cavity quality factor does not necessarily maximize the response under femtosecond excitation. Here, we experimentally demonstrate that hybrid metal-dielectric metasurfaces provide a practical platform for optimizing this trade-off. By coupling a low-Q localized surface plasmon resonance of Au nanodisks to a high-Q dielectric mode of a\n                    <a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <a:mrow>\n                        <a:msub>\n                          <a:mi>TiO<\/a:mi>\n                          <a:mn>2<\/a:mn>\n                        <\/a:msub>\n                      <\/a:mrow>\n                    <\/a:math>\n                    metasurface, we continuously tune the Q factors of the hybrid modes over a broad range while preserving the plasmonic hotspot geometry. Using four-photon photoemission electron microscopy under 100-fs excitation, we map the nonlinear near-field response and correlate it with spectrally extracted Q factors and ultrafast dynamics measured by time-resolved photoemission electron microscopy. The response varies nonmonotonically with Q and reaches a maximum at\n                    <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <c:mrow>\n                        <c:mi mathvariant=\"normal\">Q<\/c:mi>\n                        <c:mo>\u2248<\/c:mo>\n                        <c:mn>2<\/c:mn>\n                        <c:mn>0<\/c:mn>\n                      <\/c:mrow>\n                    <\/c:math>\n                    , where the photoemission yield is enhanced approximately 15-fold relative to the uncoupled metasurface. These results identify pulse-cavity Q-factor matching between the cavity and the driving pulse as a key design principle for pulsed-laser nanophotonics.\n                  <\/jats:p>","DOI":"10.1103\/zkdb-qhps","type":"journal-article","created":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T12:26:13Z","timestamp":1784550373000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Q-Factor Matching for Femtosecond Near-Field Enhancement in Hybrid Metal-Dielectric Metasurfaces"],"prefix":"10.1103","volume":"137","author":[{"given":"Yaolong","family":"Li","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02v51f717","id-type":"ROR","asserted-by":"publisher"}],"name":"Peking University"},{"id":[{"id":"https:\/\/ror.org\/02e16g702","id-type":"ROR","asserted-by":"publisher"}],"name":"Hokkaido 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