{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T18:59:31Z","timestamp":1790017171558,"version":"4.0.1"},"reference-count":23,"publisher":"Optica Publishing Group","issue":"20","license":[{"start":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T00:00:00Z","timestamp":1789948800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T00:00:00Z","timestamp":1789948800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2026,10,5]]},"abstract":"<jats:p>\n                    We develop a symmetry-tunable framework for second-harmonic generation (SHG) in modified Tietz quantum wells and a fast, accurate surrogate to predict SHG under external fields. Within an effective-mass\/envelope model, we quantify how structural parameters and static fields reshape level intervals and intersubband dipole couplings, thereby controlling SHG amplitude and lineshape. A magnetic field compresses the envelope and tends to equalize subband spacings, damping asymmetry-driven SHG at high fields, whereas an electric field tilts the well, breaks inversion symmetry, and can realign resonances; the trends are governed by the detuning between one- and two-photon channels and by the strength of the dipole overlap chain. Building on these insights, we train a shallow feed-forward network that maps the electric and magnetic fields directly to the SHG peak, achieving near-unity R\n                    <jats:sup>2<\/jats:sup>\n                    with very low RMSE on both medium- and small-sample datasets, and retaining accuracy over modest extrapolation, enabling rapid parameter selection without repeated eigenproblem and susceptibility evaluations. The parameter ranges and model knobs are qualitatively linked to GaAs\/AlGaAs controls, providing a practical route from symmetry tuning to SHG prediction in experimentally relevant regimes.\n                  <\/jats:p>","DOI":"10.1364\/oe.604765","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T07:00:08Z","timestamp":1788246008000},"page":"36775","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tuning mechanism and machine learning prediction of second harmonic generation in modified Tietz quantum wells"],"prefix":"10.1364","volume":"34","author":[{"given":"Meilin","family":"Hu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/042k5fe81","id-type":"ROR","asserted-by":"publisher"}]},{"name":"Universit\u00e0 di Napoli Federico II"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Salvatore","family":"Amoruso","sequence":"additional","affiliation":[{"name":"Universit\u00e0 di Napoli Federico II"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jijil J. J.","family":"Nivas","sequence":"additional","affiliation":[{"name":"Universit\u00e0 di Napoli Federico II"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianhui","family":"Yuan","sequence":"additional","affiliation":[{"name":"Guangxi Medical University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1083-7723","authenticated-orcid":true,"given":"Zhihai","family":"Zhang","sequence":"additional","affiliation":[{"name":"Yancheng Teachers University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"key":"oe-34-20-36775-R1","doi-asserted-by":"publisher","first-page":"200","DOI":"10.1038\/nphoton.2017.14","type":"journal-article","volume":"11","author":"Timurdogan","year":"2017","journal-title":"Nat. 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