scholarly journals Single-photon Coulomb explosion of methanol using broad bandwidth ultrafast EUV pulses

2017 ◽  
Vol 19 (21) ◽  
pp. 13488-13495 ◽  
Author(s):  
Itamar Luzon ◽  
Krishna Jagtap ◽  
Ester Livshits ◽  
Oleg Lioubashevski ◽  
Roi Baer ◽  
...  
Keyword(s):  
Single Photon ◽  
Coulomb Explosion ◽  
Ultrafast Dynamics ◽  
Time Resolved ◽  
Broad Bandwidth ◽  
Time Resolved Imaging

Single-photon Coulomb explosion of methanol using broad bandwidth ultrafast EUV pulses towards achieving time resolved imaging of ultrafast dynamics.

scholarly journals Gated SPAD Arrays for Single-Photon Time-Resolved Imaging and Spectroscopy

2019 ◽  
Vol 11 (6) ◽  
pp. 1-10 ◽  
Author(s):  
Enrico Conca ◽  
Iris Cusini ◽  
Fabio Severini ◽  
Rudi Lussana ◽  
Franco Zappa ◽  
...  
Keyword(s):  
Single Photon ◽  
Time Resolved ◽  
Imaging And Spectroscopy ◽  
Time Resolved Imaging

Time-resolved imaging of fluorescent inclusions in optically turbid medium — phantom study

2010 ◽  
Vol 18 (1) ◽  
Author(s):  
M. Kacprzak ◽  
A. Liebert ◽  
P. Sawosz ◽  
N. Żołek ◽  
D. Milej ◽  
...  
Keyword(s):  
Optical Properties ◽  
Imaging System ◽  
Single Photon ◽  
Photon Counting ◽  
Turbid Medium ◽  
Time Resolved ◽  
Excitation Light ◽  
Time Resolved Imaging ◽  
Fish Tank ◽  
Surrounding Liquid

AbstractWe present results of application of a time-resolved optical system for imaging of fluorescence excited in an inclusion containing indocyanine green (ICG), and located in optically turbid medium. The developed imaging system enabled simultaneous acquisition of fluorescence and diffusive reflectance. Eight independent time-resolved measurement channels based on time-correlated single photon counting technique were applied. In four of these channels, used for the fluorescence detection, sets of filters were applied in order to block the excitation light. Fast optomechanical switches allowed us to illuminate sequentially nine different spots on the surface of the studied object and finally 4×4 pixels maps at excitation and emission wavelengths were obtained. A liquid phantom used in this study consists of the fish tank filed with a solution ofmilk and water with black ink added to obtain optical properties in the range of the optical properties typical for the living tissue. A gel ball of a diameter of 5 mm with precisely controlled concentration of ICG was immersed in the liquid. The measurements were performed for inclusion located at different depths and for various ICG concentrations in the gel ball and in the surrounding liquid. The recorded distributions of times of arrival (DTA) of fluorescence photons and times of flight (DTOF) of diffusely reflected photons were analyzed by calculation of their statistical moments. We observed specific changes in moments of the measured DTAs as a function of depth of immersion of the fluorescent inclusion in the medium. We noted also that the changes of moments depend significantly on concentration of the dye in the fluorescence inclusion as well as in the surrounding liquid.

Probing ultrafast dynamics of chiral molecules using time-resolved photoelectron circular dichroism

2016 ◽  
Vol 194 ◽  
pp. 325-348 ◽  
Author(s):  
Samuel Beaulieu ◽  
Antoine Comby ◽  
Baptiste Fabre ◽  
Dominique Descamps ◽  
Amélie Ferré ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Extreme Ultraviolet ◽  
Single Photon ◽  
Rydberg States ◽  
Chiral Discrimination ◽  
Infrared Range ◽  
Ultrafast Dynamics ◽  
Chiral Molecules ◽  
Time Resolved ◽  
Circular Dichroïsm

Measuring the ultrafast dynamics of chiral molecules in the gas phase has been a long standing and challenging quest of molecular physics. The main limitation to reach that goal has been the lack of highly sensitive chiroptical measurement. By enabling chiral discrimination with up to several 10% of sensitivity, photoelectron circular dichroism (PECD) offers a solution to this issue. However, tracking ultrafast processes requires measuring PECD with ultrashort light pulses. Here we compare the PECD obtained with different light sources, from the extreme ultraviolet to the mid-infrared range, leading to different ionization regimes: single-photon, resonance-enhanced multiphoton, above-threshold and tunnel ionization. We use single and multiphoton ionization to probe the ultrafast relaxation of fenchone molecules photoexcited in their first Rydberg states. We show that time-resolved PECD enables revealing dynamics much faster than the population decay of the Rydberg states, demonstrating the high sensitivity of this technique to vibronic relaxation.

scholarly journals Visualizing the emission of a single photon with frequency and time resolved spectroscopy

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 474
Author(s):  
Aleksei Sharafiev ◽  
Mathieu L. Juan ◽  
Oscar Gargiulo ◽  
Maximilian Zanner ◽  
Stephanie Wögerer ◽  
...  
Keyword(s):  
Quantum Electrodynamics ◽  
Quantum Physics ◽  
Single Photon ◽  
High Sensitivity ◽  
Analytical Description ◽  
Ultrafast Dynamics ◽  
Level System ◽  
Time Resolved Fluorescence ◽  
Resonant Frequencies ◽  
Time Resolved

At the dawn of Quantum Physics, Wigner and Weisskopf obtained a full analytical description (a photon portrait) of the emission of a single photon by a two-level system, using the basis of frequency modes (Weisskopf and Wigner, "Zeitschrift für Physik", 63, 1930). A direct experimental reconstruction of this portrait demands an accurate measurement of a time resolved fluorescence spectrum, with high sensitivity to the off-resonant frequencies and ultrafast dynamics describing the photon creation. In this work we demonstrate such an experimental technique in a superconducting waveguide Quantum Electrodynamics (wQED) platform, using single transmon qubit and two coupled transmon qubits as quantum emitters. In both scenarios, the photon portraits agree quantitatively with the predictions of the input-output theory and qualitatively with Wigner-Weisskopf theory. We believe that our technique allows not only for interesting visualization of fundamental principles, but may serve as a tool, e.g. to realize multi-dimensional spectroscopy in waveguide Quantum Electrodynamics.

Single Point PICA Probing with an Avalanche Photo-Diode

2001 ◽  
Author(s):  
Mike Bruce ◽  
Rama R. Goruganthu ◽  
Shawn McBride ◽  
David Bethke ◽  
J.M. Chin
Keyword(s):  
Single Photon ◽  
Single Point ◽  
Photon Counting ◽  
Ring Oscillator ◽  
Time Resolved ◽  
Single Photon Counting ◽  
Photo Diode ◽  
Avalanche Photo Diode ◽  
Photo Multiplier Tube ◽  
Channel Plate

Abstract For time resolved hot carrier emission from the backside, an alternate approach is demonstrated termed single point PICA. The single point approach records time resolved emission from an individual transistor using time-correlated-single-photon counting and an avalanche photo-diode. The avalanche photo-diode has a much higher quantum efficiency than micro-channel plate photo-multiplier tube based imaging cameras typically used in earlier approaches. The basic system is described and demonstrated from the backside on a ring oscillator circuit.

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