More Like this

1. Comparing the fundamental imaging depth limit of two-photon, three-photon, and non-degenerate two-photon microscopy

   https://doi.org/10.1364/OL.392724  

   Cheng, Xiaojun ; Sadegh, Sanaz ; Zilpelwar, Sharvari ; Devor, Anna ; Tian, Lei ; Boas, David A. ( January 2020 , Optics Letters)
2. Scattering-Based Geometric Shaping of Photon-Photon Interactions

   https://doi.org/10.1103/PhysRevLett.123.260502  

   Asban, Shahaf ; Mukamel, Shaul ( December 2019 , Physical Review Letters)
3. Supernova constraints on an axion-photon-dark photon interaction

   https://doi.org/10.1007/JHEP06(2021)167  

   Hook, Anson ; Marques-Tavares, Gustavo ; Ristow, Clayton ( June 2021 , Journal of High Energy Physics)

   A bstract We present the supernova constraints on an axion-photon-dark photon coupling, which can be the leading coupling to dark sector models and can also lead to dramatic changes to axion cosmology. We show that the supernova bound on this coupling has two unusual features. One occurs because the scattering that leads to the trapping regime converts axions and dark photons into each other. Thus, if one of the two new particles is sufficiently massive, both production and scattering become suppressed and the bounds from bulk emission and trapped (area) emission both weaken exponentially and do not intersection The other unusual feature occurs because for light dark photons, longitudinal modes couple more weakly than transverse modes do. Since the longitudinal mode is more weakly coupled, it can still cause excessive cooling even if the transverse mode is trapped. Thus, the supernova constraints for massive dark photons look like two independent supernova bounds super-imposed on top of each other.
4. Luminescent Carbazole-Based Eu ^III and Yb ^III Complexes with a High Two-Photon Absorption Cross-Section Enable Viscosity Sensing in the Visible and Near IR with One- and Two-Photon Excitation

   https://doi.org/10.1021/acs.inorgchem.9b03561  

   Monteiro, Jorge H. ; Fetto, Natalie R. ; Tucker, Matthew J. ; de Bettencourt-Dias, Ana ( March 2020 , Inorganic Chemistry)
5. High-quality photon-pair and heralded single-photon generation using periodically-poled thin-film lithium niobate

   https://doi.org/10.1364/FIO.2019.FTu6A.3  

   Zhao, Jie ; Ma, Chaoxuan ; Ruesing, Michael ; Mookherjea, Shayan ( September 2019 , Frontiers in Optics + Laser Science APS/DLS 2019)

   Photon-pair generation is shown using periodically-poled thin-film lithium niobate waveguides, with coincidences-to-accidentals ratio CAR>67,000 at 41kHz pairs rate, and heralded single-photon generation with g(2)(0)<0.05 at 860kHz herald rate.