{
  "abstract": "Infrared spectroscopy is a key tool to study complex structural dynamics in molecular systems. However, resolving weak or broad vibrational modes is challenging due to their rapid decay. Here, we demonstrate a technique to significantly extend the detectable lifetime - and thereby spectral resolution - of molecular signatures by employing synchronized time-gated optical parametric amplification of mid-infrared free-induction decay signals. Utilizing a Cr:ZnS laser system and a nonlinear ZnGeP2 crystal, we achieve a 10-fold increase in the electric field strength of the infrared molecular signal, yielding a two-orders of magnitude enhancement in dynamic range and a 2-fold increase in the signal-to-noise ratio. Using isopropyl alcohol as a model system, we demonstrate that OPA-enhanced detection extends the observable window of vibrational modes up to 72 %. This approach allows for the reconstruction of high-fidelity molecular fingerprints that resolve complex vibrational relaxation pathways and weak structural dynamics, previously hidden within the background and noise, providing a pathway for new high-sensitivity and time-resolved studies of complex chemical structures.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.09783",
  "author_total": 5,
  "authors": [
    {
      "name": "Sergio Revuelta"
    },
    {
      "name": "Gerard Faustino"
    },
    {
      "name": "Ka Fai Mak"
    },
    {
      "name": "Ferenc Krausz"
    },
    {
      "name": "Nicholas Karpowicz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0khxp60vvs647.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.09783",
  "fulltext_url": null,
  "id": "0khxp60vvs647",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.09783",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.chem-ph"
    ],
    [
      "arxiv",
      "physics.optics"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.09783",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0khxp60vvs647.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:04Z",
      "native_id": "2611.09783",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.09783"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "arxiv:physics.chem-ph",
      "subfield": "physical"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Time-gated optical-parametric-amplification and field-resolved detection of mid-infrared free-induction decay signals",
  "title_text": "Time-gated optical-parametric-amplification and field-resolved detection of mid-infrared free-induction decay signals",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:04Z",
  "url": "https://research.draconitic.com/paper/0khxp60vvs647",
  "venue": "arXiv",
  "versions": []
}