scholarly journals Ultrafast electron diffraction from nanophotonic waveforms via dynamical Aharonov-Bohm phases

2020 ◽  
Vol 6 (47) ◽  
pp. eabc8804
Author(s):  
K. J. Mohler ◽  
D. Ehberger ◽  
I. Gronwald ◽  
C. Lange ◽  
R. Huber ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Time Resolution ◽  
Light Cycle ◽  
Pump Probe ◽  
Electromagnetic Potentials ◽  
Electric And Magnetic Fields ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Electron Imaging ◽  
Aharonov Bohm

Electron interferometry via phase-contrast microscopy, holography, or picodiffraction can provide a direct visualization of the static electric and magnetic fields inside or around a material at subatomic precision, but understanding the electromagnetic origin of light-matter interaction requires time resolution as well. Here, we demonstrate that pump-probe electron diffraction with all-optically compressed electron pulses can capture dynamic electromagnetic potentials in a nanophotonic material with sub-light-cycle time resolution via centrosymmetry-violating Bragg spot dynamics. The origin of this effect is a sizable quantum mechanical phase shift that the electron de Broglie wave obtains from the oscillating electromagnetic potentials within less than 1 fs. Coherent electron imaging and scattering can therefore reveal the electromagnetic foundations of light-matter interaction on the level of the cycles of light.

scholarly journals Ultrafast electron diffraction of THz-excited nanostructures

2019 ◽  
Vol 205 ◽  
pp. 08004
Author(s):  
Kathrin J. Mohler ◽  
Peter Baum
Keyword(s):  
Electron Diffraction ◽  
Phase Shifts ◽  
Time Dependent ◽  
Electromagnetic Response ◽  
Ultrafast Electron Diffraction ◽  
Single Cycle ◽  
Electromagnetic Potentials ◽  
Aharonov Bohm

We study the electromagnetic response of nanostructures to single-cycle THz excitation by using ultrafast electron diffraction. Although the nanostructures themselves are static, there exist complex sub-THz-cycle Bragg spot dynamics that relate via time-dependent Aharonov-Bohm-like phase shifts to the nanoscale electromagnetic potentials.

scholarly journals Attosecond metrology in a continuous-beam transmission electron microscope

2020 ◽  
Vol 6 (46) ◽  
pp. eabb1393
Author(s):  
A. Ryabov ◽  
J. W. Thurner ◽  
D. Nabben ◽  
M. V. Tsarev ◽  
P. Baum
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Time Resolution ◽  
Continuous Wave ◽  
Oscillation Period ◽  
Average Brightness ◽  
Transmission Electron ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Beam Transmission

Electron microscopy can visualize the structure of complex materials with atomic and subatomic resolution, but investigations of reaction dynamics and light-matter interaction call for time resolution as well, ideally on a level below the oscillation period of light. Here, we report the use of the optical cycles of a continuous-wave laser to bunch the electron beam inside a transmission electron microscope into electron pulses that are shorter than half a cycle of light. The pulses arrive at the target at almost the full average brightness of the electron source and in synchrony to the optical cycles, providing attosecond time resolution of spectroscopic features. The necessary modifications are simple and can turn almost any electron microscope into an attosecond instrument that may be useful for visualizing the inner workings of light-matter interaction on the basis of the atoms and the cycles of light.

scholarly journals Reaction microscope endstation at FLASH2

2019 ◽  
Vol 26 (3) ◽  
pp. 854-867 ◽  
Author(s):  
Georg Schmid ◽  
Kirsten Schnorr ◽  
Sven Augustin ◽  
Severin Meister ◽  
Hannes Lindenblatt ◽  
...  
Keyword(s):  
Gas Phase ◽  
Extreme Ultraviolet ◽  
Time Resolved ◽  
Pump Probe ◽  
Natural Time ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Probe Spectroscopy ◽  
Small Clusters ◽  
Reaction Microscope

A reaction microscope dedicated to multi-particle coincidence spectroscopy on gas-phase samples is installed at beamline FL26 of the free-electron laser FLASH2 in Hamburg. The main goals of the instrument are to follow the dynamics of atoms, molecules and small clusters on their natural time-scale and to study non-linear light–matter interaction with such systems. To this end, the reaction microscope is combined with an in-line extreme-ultraviolet (XUV) split-delay and focusing optics, which allows time-resolved XUV-XUV pump–probe spectroscopy to be performed.

scholarly journals Near-single-cycle pulses generated through post-compression on FAB1 laser at ATTOLAB-Orme facility

2021 ◽  
Vol 255 ◽  
pp. 11006
Author(s):  
Jean-François Hergott ◽  
Hugo J. B. Marroux ◽  
Rodrigo Lopez-Martens ◽  
Fabrice Réau ◽  
Fabien Lepetit ◽  
...  
Keyword(s):  
Time Resolution ◽  
High Field ◽  
High Energy ◽  
Single Cycle ◽  
Carrier Envelope Phase ◽  
Compression Stage ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Attosecond Science

Generating high-energy few-cycle pulses is key in the study of light-matter interaction in the regime of high field physics. Attosecond science possess the necessary time resolution to study the underlying fundamental processes but requires repetitions rates on the order the kilohertz and stabilization of the Carrier-Envelope Phase. We present here a post-compression stage delivering 3.8fs pulses with 2.5mJ coupled to a Ti: Sa based 1 kHz TW-class laser which can deliver 17.8fs pulses with 350mrad shot to shot CEP noise. This is the first step towards high-energy few-cycle post-compression of the FAB laser at ATTOLAB-Orme.

scholarly journals Two-color pump-probe interferometry of ultra-fast light-matter interaction

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yoshio Hayasaki ◽  
Shin-ichi Fukuda ◽  
Satoshi Hasegawa ◽  
Saulius Juodkazis
Keyword(s):  
Pump Probe ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Fast Light

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

Quantum description of light–matter coupling

2017 ◽  
Author(s):  
Alexey V. Kavokin ◽  
Jeremy J. Baumberg ◽  
Guillaume Malpuech ◽  
Fabrice P. Laussy
Keyword(s):  
Cavity Mode ◽  
Optical Field ◽  
Level System ◽  
Bloch Equations ◽  
Optical Bloch Equations ◽  
Matter Coupling ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Full Quantum ◽  
The Ideal

In this chapter we study with the tools developed in Chapter 3 the basic models that are the foundations of light–matter interaction. We start with Rabi dynamics, then consider the optical Bloch equations that add phenomenologically the lifetime of the populations. As decay and pumping are often important, we cover the Lindblad form, a correct, simple and powerful way to describe various dissipation mechanisms. Then we go to a full quantum picture, quantizing also the optical field. We first investigate the simpler coupling of bosons and then culminate with the Jaynes–Cummings model and its solution to the quantum interaction of a two-level system with a cavity mode. Finally, we investigate a broader family of models where the material excitation operators differ from the ideal limits of a Bose and a Fermi field.

scholarly journals Surface plasmon polariton–enhanced photoluminescence of monolayer MoS2 on suspended periodic metallic structures

Nanophotonics ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 975-982
Author(s):  
Huanhuan Su ◽  
Shan Wu ◽  
Yuhan Yang ◽  
Qing Leng ◽  
Lei Huang ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
Surface Plasmon Polariton ◽  
Plasmonic Nanostructures ◽  
Metallic Nanoparticle ◽  
Systematic Analysis ◽  
Excitation Rate ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Plasmon Polariton ◽  
Plasmonic Effects

AbstractPlasmonic nanostructures have garnered tremendous interest in enhanced light–matter interaction because of their unique capability of extreme field confinement in nanoscale, especially beneficial for boosting the photoluminescence (PL) signals of weak light–matter interaction materials such as transition metal dichalcogenides atomic crystals. Here we report the surface plasmon polariton (SPP)-assisted PL enhancement of MoS2 monolayer via a suspended periodic metallic (SPM) structure. Without involving metallic nanoparticle–based plasmonic geometries, the SPM structure can enable more than two orders of magnitude PL enhancement. Systematic analysis unravels the underlying physics of the pronounced enhancement to two primary plasmonic effects: concentrated local field of SPP enabled excitation rate increment (45.2) as well as the quantum yield amplification (5.4 times) by the SPM nanostructure, overwhelming most of the nanoparticle-based geometries reported thus far. Our results provide a powerful way to boost two-dimensional exciton emission by plasmonic effects which may shed light on the on-chip photonic integration of 2D materials.

scholarly journals Linewidth narrowing of aluminum breathing plasmon resonances in Bragg gratings decorated nanodisks

2021 ◽  
Author(s):  
Xiaomin Zhao ◽  
Chenglin Du ◽  
Rong Leng ◽  
Li Li ◽  
Weiwei Luo ◽  
...  
Keyword(s):  
Light Emission ◽  
Emission Control ◽  
Bragg Gratings ◽  
High Quality ◽  
Plasmon Resonances ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Radiative Losses

Plasmon resonances with high-quality are of great importance in light emission control and light-matter interaction. Nevertheless, the inherent Ohmic and radiative losses usually hinder the plasmon performance of the metallic...

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