Journal
ACS PHOTONICS
Volume 8, Issue 9, Pages 2722-2727Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c00777
Keywords
entangled photons; hyper-Raman spectroscopy; Liouville-space pathways; one-photon resonances
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0020168]
- NSF [CHE-1953045]
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Time-energy entangled photons are used to calculate vibrational hyper-Raman signals of the organic chromophore Wu112. Compared to classical light, entangled-photon HR signal scales linearly with the SPDC pump field intensity, providing selectivity and allowing weak-field measurements on fragile samples.
Time-energy entangled photons produced by spontaneous parametric down-conversion (SPDC) are employed to calculate vibrational hyper-Raman (HR) signals of the conjugated organic chromophore Wu112. Compared with classical light, time-energy entanglement can provide selectivity of Liouville-space pathways and thus suppress the strong broad electronic-Raman background arising from one-photon resonances of the intermediate states. The entangled-photon HR signal scales linearly with the SPDC pump field intensity rather than quadratically for classical light, which allows weak-field measurements on fragile samples.
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