Results 31 to 40 of about 377,173 (291)
Frontiers in Materials, 2023 Understanding the functions of enzymes in various physiological processes is important, but the design of signaling probes for fast analysis of enzymatic activity is particularly challenging.
Meicen Liu +11 more
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Two photon frequency conversion
Optics Express, 2012 We study the case of two simultaneous three-wave-mixing processes, where one frequency is converted to another through an intermediate frequency. The common assumption is that these processes can occur only when the material is transparent at all participating frequencies. Here we show experimentally that, under appropriate conditions, the intermediate
Gil, Porat +3 more
openaire +2 more sources
Two-photon-counting interferometry [PDF]
Physical Review A, 2013 Two-photon-counting interferometry has been realized by measuring the electrical current due to two-photon absorption in the space-charge layer of a semiconductor detector located at the output port of an interferometer. We apply this technique to study the correlation properties of twin beams issued from parametric fluorescence.
Boitier, Fabien +5 more
openaire +2 more sources
Frontiers in Neuroscience, 2023 To understand how neural activity encodes and coordinates behavior, it is desirable to record multi-neuronal activity in freely behaving animals. Imaging in unrestrained animals is challenging, especially for those, like larval Drosophila melanogaster ...
Akihiro Yamaguchi +7 more
doaj +1 more source
Two-photon spectra of quantum emitters [PDF]
, 2012 We apply our recently developed theory of frequency-filtered and time-resolved N-photon correlations to study the two-photon spectra of a variety of systems of increasing complexity: single mode emitters with two limiting statistics (one harmonic ...
del Valle, E. +4 more
core +4 more sources
Simultaneous two-photon imaging and two-photon optogenetics of cortical circuits in three dimensions
eLife, 2018 The simultaneous imaging and manipulating of neural activity could enable the functional dissection of neural circuits. Here we have combined two-photon optogenetics with simultaneous volumetric two-photon calcium imaging to measure and manipulate neural
Weijian Yang +4 more
doaj +1 more source
Two-photon interference without bunching two photons [PDF]
Physics Letters A, 2003 We report an interference experiment in which the two-photon entangled state interference cannot be pictured in terms of the overlap and bunching of two individual photons on a beamsplitter. We also demonstrate that two-photon interference, or photon bunching effect on a beamsplitter, does not occur if the two-photon Feynman amplitudes are ...
openaire +2 more sources
Reliable and Elastic Propagation of Cortical Seizures In Vivo
Cell Reports, 2017 Mapping the fine-scale neural activity that underlies epilepsy is key to identifying potential control targets of this frequently intractable disease.
Michael Wenzel +3 more
doaj +1 more source
Two-Photon Excitation of Azobenzene Photoswitches for Synthetic Optogenetics
Applied Sciences, 2020 Synthetic optogenetics is an emerging optical technique that enables users to photocontrol molecules, proteins, and cells in vitro and in vivo. This is achieved by use of synthetic chromophores—denoted photoswitches—that undergo light ...
Shai Kellner, Shai Berlin
doaj +1 more source
Maskless Writing of Surface-Attached Micro-Magnets by Two-Photon Crosslinking
Actuators, 2023 Surface-bound 3D micro-magnets are fabricated from photoreactive copolymers filled with magnetic nanoparticles by maskless 3D writing. The structures are generated by 2-photon crosslinking (2PC), which allows direct writing into solid films of composites
Nicolas Geid +3 more
doaj +1 more source