Nonlinear Spectroscopy of Chromophores in Condensed Phases with Multiple Frequency Combs

2019 ◽  
pp. 355-379
Author(s):  
JunWoo Kim ◽  
Minhaeng Cho
Keyword(s):  
Nonlinear Spectroscopy ◽  
Condensed Phases ◽  
Multiple Frequency ◽  
Frequency Combs

scholarly journals Quasi-supercontinuum source in the extreme ultraviolet using multiple frequency combs from high-harmonic generation

2017 ◽  
Vol 25 (6) ◽  
pp. 6936 ◽  
Author(s):  
Martin Wünsche ◽  
Silvio Fuchs ◽  
Stefan Aull ◽  
Jan Nathanael ◽  
Max Möller ◽  
...  
Keyword(s):  
Harmonic Generation ◽  
Extreme Ultraviolet ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Multiple Frequency ◽  
Frequency Combs

scholarly journals Parallel Extreme Learning Machines Based on Frequency Multiplexing

2021 ◽  
Vol 12 (1) ◽  
pp. 214
Author(s):  
Alessandro Lupo ◽  
Serge Massar
Keyword(s):  
Recent Work ◽  
Frequency Comb ◽  
Light Sources ◽  
Extreme Learning Machines ◽  
Multiple Frequency ◽  
Frequency Combs ◽  
Learning Machines ◽  
Frequency Multiplexing ◽  
Classification Tasks ◽  
Learning Machine

In a recent work, we reported on an Extreme Learning Machine (ELM) implemented in a photonic system based on frequency multiplexing, where each wavelength of the light encodes a different neuron state. In the present work, we experimentally demonstrate the parallelization potentialities of this approach. We show that multiple frequency combs centered on different frequencies can copropagate in the same system, resulting in either multiple independent ELMs executed in parallel on the same substrate or a single ELM with an increased number of neurons. We experimentally tested the performances of both these operation modes on several classification tasks, employing up to three different light sources, each of which generates an independent frequency comb. We also numerically evaluated the performances of the system in configurations containing up to 15 different light sources.

scholarly journals Cavity-enhanced ultrafast two-dimensional spectroscopy using higher-order modes

2019 ◽  
Vol 205 ◽  
pp. 03015
Author(s):  
K. Allison Thomas
Keyword(s):  
Ultrafast Spectroscopy ◽  
High Sensitivity ◽  
Higher Order ◽  
Optical Resonator ◽  
Two Dimensional ◽  
Multiple Frequency ◽  
Frequency Combs ◽  
Resonator Cavity ◽  
Higher Order Modes

We describe methods using frequency combs and cavities for recording two-dimensional ultrafast spectroscopy signals with high sensitivity. By coupling multiple frequency combs to modes of an optical resonator, cavity-enhanced 2D spectroscopy signals are naturally generated.

Structural and Spectroscopic Study of Langmuir-Schäfer Films of Bis Zn-Ethane-Bridged Porphyrins Dimer

2003 ◽  
Vol 771 ◽  
Author(s):  
G. Panzera ◽  
S. Conoci ◽  
S. Coffa ◽  
B. Pignataro ◽  
S. Sortino ◽  
...  
Keyword(s):  
Surface Pressure ◽  
Scanning Force Microscopy ◽  
Structural Features ◽  
Solid Surfaces ◽  
Condensed Phases ◽  
Brewster Angle Microscopy ◽  
Force Microscopy ◽  
Vis Spectroscopy ◽  
Scanning Force ◽  
Supramolecular Aggregates

AbstractThin films (1-24 layers) of bis-zinc ethane-bridged porphyrin dimer (1) have been transferred on solid surfaces, by the Langmuir- Schäfer (LS) horizontal method. The related surface pressurearea isotherm curve shows that in dependence of the film pressure different condensed phases may occur in the monolayer. The inspection of the monolayer by Brewster Angle Microscopy (BAM) reveals the presence of peculiar networks whose structural features seemingly change upon film compression. On the other hand, the Scanning Force Microscopy (SFM) analysis performed on LS films shows fractal networks constituted by nanoscopic supramolecular aggregates, whose shape and size depend again on the LS deposition surface pressure. Finally, also UV-vis spectroscopy measurements indicates that the absorption is almost linearly related to the film thickness that is directly connected to the surface pressure.

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