Experimental Upper Bounds for Resonance-Enhanced Entangled Two-Photon Absorption Cross Section of Indocyanine Green

• URL: http://arxiv.org/abs/2312.14382v1
• Date: Fri, 22 Dec 2023 02:15:22 GMT
• Title: Experimental Upper Bounds for Resonance-Enhanced Entangled Two-Photon Absorption Cross Section of Indocyanine Green
• Authors: Manni He, Bryce P. Hickam, Nathan Harper, Scott K. Cushing
• Abstract summary: Resonant intermediate states have been proposed to increase the efficiency of entangled two-photon absorption (ETPA) We investigate for the first time r-ETPA in an organic molecular dye, indocyanine green (ICG), when excited by broadband entangled photons in near-IR.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Resonant intermediate states have been proposed to increase the efficiency of entangled two-photon absorption (ETPA). Although resonance-enhanced ETPA (r-ETPA) has been demonstrated in atomic systems using bright squeezed vacuum, it has not been studied in organic molecules. We investigate for the first time r-ETPA in an organic molecular dye, indocyanine green (ICG), when excited by broadband entangled photons in near-IR. Similar to many reported virtual state mediated ETPA (v-ETPA) measurements, no r-ETPA signals are measured, with an experimental upper bound for the cross section placed at $6 \times 10^{-23}$ cm$^2$/molecule. In addition, the classical resonance-enhanced two-photon absorption (r-TPA) cross section of ICG at 800 nm is measured for the first time to be $20(\pm13)$ GM, suggesting that having a resonant intermediate state does not significantly enhance two-photon processes in ICG. The spectrotemporally resolved emission signatures of ICG excited by entangled photons are also presented to support this conclusion.

Related papers

• A Liquid-Core Fiber Platform for Classical and Entangled Two-Photon Absorption Measurements [0.0]
  We introduce a toluene-filled fiber platform for two-photon absorption measurements. With only a 7.3 nL excitation volume, we measure classical two-photon absorption (C2PA) at an average laser power as low as 1.75 nW.
  arXiv  Detail & Related papers  (2024-10-18T18:53:30Z)
• Towards robust detection of entangled two-photon absorption [0.0]
  Evidence for entangled two-photon absorption (ETPA) effects remain highly debated, especially at low-fluxes. Here, we structure the transverse spatial correlations of entangled photon pairs to evidence signs of ETPA at room-temperature in organic and inorganic chromophores. Our results present a step towards verifying ETPA and experimentally exploring entangled light-matter interactions.
  arXiv  Detail & Related papers  (2024-10-08T16:58:47Z)
• Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride [62.170141783047974]
  Single photon emitters hosted in hexagonal boron nitride (hBN) are essential building blocks for quantum photonic technologies that operate at room temperature. We experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs. Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
  arXiv  Detail & Related papers  (2024-05-03T23:02:30Z)
• Aspects of Two-photon Absorption of Squeezed Light: the CW limit [0.0]
  We find an enhancement of the two-photon absorption due to resonant contributions from the large squeezed light bandwidth. One-photon absorption is the dominant process in the region of parameter space where a large enhancement of the two-photon absorption is possible.
  arXiv  Detail & Related papers  (2022-05-16T07:34:03Z)
• Hot-Band Absorption Can Mimic Entangled Two-Photon Absorption [52.77024349608834]
  We investigated the fluorescence signals from Rhodamine 6G and LDS798 excited with a CW laser or an entangled photon pair source at 1060 nm. We observed a signal that originates from hot-band absorption (HBA), which is one-photon absorption from thermally-populated vibrational levels of the ground electronic state. For the typical conditions under which E2PEF measurements are performed, contributions from the HBA process could lead to a several orders-of-magnitude overestimate of the quantum advantage for excitation efficiency.
  arXiv  Detail & Related papers  (2021-11-10T21:17:47Z)
• Experimental study on the effects of photon-pair temporal correlations in entangled two-photon absorption [0.0]
  Entangled two-photon absorption (ETPA) has recently become a topic of lively debate. This work provides a thorough experimental study of ETPA in Rhodamine B and Zinc Tetraphenylporphirin.
  arXiv  Detail & Related papers  (2021-01-26T18:31:09Z)
• Auto-heterodyne characterization of narrow-band photon pairs [68.8204255655161]
  We describe a technique to measure photon pair joint spectra by detecting the time-correlation beat note when non-degenerate photon pairs interfere at a beamsplitter. The technique is well suited to characterize pairs of photons, each of which can interact with a single atomic species.
  arXiv  Detail & Related papers  (2021-01-08T18:21:30Z)
• Spectrally multimode integrated SU(1,1) interferometer [50.591267188664666]
  The presented interferometer includes a polarization converter between two photon sources and utilizes a continuous-wave (CW) pump. We show that this configuration results in almost perfect destructive interference at the output and supersensitivity regions below the classical limit.
  arXiv  Detail & Related papers  (2020-12-07T14:42:54Z)
• Setting bounds on two-photon absorption cross-sections in common fluorophores with entangled photon pair excitation [48.7576911714538]
  We use a fluorescence-based registration scheme to experimentally determine upper bounds on the cross-sections for six fluorophores. For two samples that have been studied by others, Rhodamine 6G and 9R-S, we measure upper bounds four and five orders of magnitude lower than the previously reported cross-sections.
  arXiv  Detail & Related papers  (2020-08-06T13:53:16Z)
• Resonant high-energy bremsstrahlung of ultrarelativistic electrons in the field of a nucleus and a pulsed light wave [68.8204255655161]
  Research investigates the resonant high-energy spontaneous bremsstrahlung of ultrarelativistic electrons with considerable energies in the field of a nucleus and a quasimonochromatic laser wave.
  arXiv  Detail & Related papers  (2020-04-05T16:27:11Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.