{1474} revision 13 modified: 09-19-2019 15:49 gmt |

Various papers put out by the Goodson group: - Two-Photon Excitation of Flavins and Flavoproteins with Classical and Quantum Light
- Report a ETPA cross-section of 2.4e-18 cm^2 / molec; corresponded with the author, this looks legit.
- This is at an input flux of 2.88e6 photons / sec, of which 2e5 are absorbed (not a fluorescence measurement.)
- Note that figure 3 input flux is in intensity, photons/sec/cm^2.
- Spatial Control of Entangled Two-Photon Absorption with Organic Chromophores
- Optically Excited Entangled States in Organic Molecules Illuminate the Dark
- Entangled Photon Absorption in an Organic Porphyrin Dendrimer
- Quantum Optical Applications in Spectroscopy: Investigations of Entangled Two-Photon Absorption and Entangled Two-Photon Excited Fluorescence in Organic Dendritic Systems.
- Investigations of Thienoacene Molecules for Classical and Entangled Two-Photon Absorption
- Smaller ETPA cross-section, 1e-19, measured through fluorescence and absorption.
- Fairly extensive MO analysis of the benzodithiophene derivatives; could mine.
- Note that 2p absorption is quite different for centrisymmetric vs unsymmetric molecules -- e.g. one half of a quadrupole molecule can undergo (allowed) 1p absorption prior a second photon.
- Entangled Photon Excited Fluorescence in Organic Materials: An Ultrafast Coincidence Detector
And from a separate group at Northwestern: - Entangled Photon Resonance Energy Transfer in Arbitrary Media
- Suggests three orders of magnitude improvement in cross-section relative to incoherent TPA.
- In SPDC, photon pairs are generated randomly and usually accompanied by undesirable multipair emissions.
- For solid-state artificial atomic systems with radiative cascades (singled quantum emitters like quantum dots), the quantum efficiency is near unity.
- Paper is highly mathematical, and deals with resonance energy transfer (which is still interesting)
Regarding high fluence sources, quantum dots / quantum structures seem promising. |