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Nearfield enhanced THz electron acceleration and spectroscopy

English title Nearfield enhanced THz electron acceleration and spectroscopy
Applicant Feurer Thomas
Number 165686
Funding scheme Project funding (Div. I-III)
Research institution Institut für angewandte Physik Universität Bern
Institution of higher education University of Berne - BE
Main discipline Other disciplines of Physics
Start/End 01.04.2016 - 31.03.2018
Approved amount 262'434.00
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Keywords (4)

Electron optics; Nearfield enhanced THz spectroscopy; THz near-field imaging; Nearfield enhancement

Lay Summary (German)

Lead
Dieses Projekt konzipiert, simuliert und testet THz Nanostrukturen mit dem Ziel eine moeglichst grosse elektrische Feldueberhoehung zu erzielen. Diese Nanostrukturen werden dann in zwei Unterprojekten eingesetzt. Einmal als Diagnostiken und andere THz getriebenen Komponenten fuer Elektronenpakete extrem kurzer Dauer in Elektronenbeschleunigern. Und zum anderen, um die zu messenden Signale in der THz Spektroskopie, speziell der nichtlineare THz Spektroskopie, zu verstaerken und damit die Messungen selbst empfindlicher zu machen.
Lay summary

Wenn speziell entwickelte Nanostrukturen mit elektromagnetischer Strahlung im THz Bereich bestrahlt werden, dann koennen sich ueberraschende und fuer viele Anwendungen vorteilhafte raeumliche Verteilungen des elektrischen Feldes ergeben. Diese Felder sind normalerweise auf kleinste Raeume konzentriert und daher oft sehr stark gegenueber dem einfallenden Feld ueberhoeht. Oft sind sie so stark, dass sie sogar die Flugbahnen von Elektronen merklich veraendern koennen. Wir nutzen diese Tatsache aus um Diagnostikgeraete und andere Komponenten fuer Elektronenbeschleuniger zu konzipieren, die mit ultrakurzen Elektronenpaketen arbeiten. Darueber hinaus sind diese Nanostrukturen auch ausgezeichnet geeignet, um die zu messenden Signale in der THz Spektroskopie, speziell der nichtlineare THz Spektroskopie, zu verstaerken und damit die Messungen selbst empfindlicher zu machen.

Die Projektziele sind daher zweigeteilt. Zum einen konzipieren, simulieren und testen wir Diagnostik und andere THz getriebenen Komponenten fuer Elektronenpakete von extrem kurzer Dauer und zum anderen entwickeln wir Strategien und Nanostrukturen, um die lineare und nichtlinear THz Spektroskopie noch empfindlicher zu machen. Da beide Forschungsrichtungen auf praktisch identischen Nanostrukturkomponenten beruhen, gibt es grosse Synergien zwischen den beiden Teilprojekten. Auf Grund ihrer kleinen Photonenenergie wird die THz Strahlung oft zur zerstoerungsfreien Materialcharakterisierung eingesetzt, so zum Beispiel bei der Identifikation molekularer Komponenten, zum Beispiel in Medikamenten, bis hin zur Sicherheitsueberwachung auf Flughaefen. Da all diese Methoden letzendlich auf THz Spektroskopie beruhen koennen sie in gleichem Masse von unseren Forschungsergebnissen profitieren.

Direct link to Lay Summary Last update: 08.04.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Transverse Space-Charge Field-Induced Plasma Dynamics for Ultraintense Electron-Beam Characterization
Tarkeshian R., Vay J. L., Lehe R., Schroeder C. B., Esarey E. H., Feurer T., Leemans W. P. (2018), Transverse Space-Charge Field-Induced Plasma Dynamics for Ultraintense Electron-Beam Characterization, in Physical Review X, 8(2), 021039-021039.

Collaboration

Group / person Country
Types of collaboration
Rasmus Ischebeck / PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Prof. Keith A. Nelson / MIT, Dept. of Chemistry, 77 Massachusetts Ave, MA 02139 Cambridge, USA United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
Dr. Soichiro Tsujino / PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Ultrafast Optics 2017 Talk given at a conference Time-domain ptychography 12.10.2017 Jackson, United States of America Schweizer Tobias; Feurer Thomas;
EAAC 2017 Talk given at a conference Laser Driven Dielectric Wakefield Acceleration 26.09.2017 Elba, Italy Hayati Moshgan; Feurer Thomas;
EAAC 2017 Talk given at a conference THz driven accelerator structures 25.09.2017 Elba, Italy Hayati Moshgan; Feurer Thomas; Waeber Yannik;
EAAC 2017 Talk given at a conference Design concept for THz-driven electron streaking with ultrahigh resolution 25.09.2017 Elba, Italy Hayati Moshgan; Feurer Thomas;
EAAC 2017 Talk given at a conference Plasma-based diagnostics of High-Brightness Electron Beams at the Frontiers of Temporal and Spatial Resolution 25.09.2017 Elba, Italy Feurer Thomas;
Graduate School Talk given at a conference Time-Domain Ptychography 15.03.2017 Jena, Germany Feurer Thomas;
Scientific Opportunities of Free Electron Lasers Talk given at a conference Time and Space-Time Ptychography (invited) 12.09.2016 Muenchen, Germany Feurer Thomas;
SPIE Optics and Photonics Talk given at a conference THz Stark Spectroscopy (invited) 28.08.2016 San Diego, United States of America Hayati Moshgan; Feurer Thomas; Waeber Yannik;
URSI AP RASC Talk given at a conference Giant THz Electric Field Enhancement (invited) 26.08.2016 Seoul, Korean Republic (South Korea) Hayati Moshgan; Feurer Thomas; Waeber Yannik;


Knowledge transfer events

Active participation

Title Type of contribution Date Place Persons involved
Zuricher Physikalische Gesellschaft Talk 08.03.2018 Zuerich, Switzerland Schweizer Tobias; Feurer Thomas; Hayati Moshgan; Waeber Yannik;


Associated projects

Number Title Start Funding scheme
153036 Meta-material based THz applications in spectroscopy and electron optics 01.04.2014 Project funding (Div. I-III)
173458 High Q-factor metamaterials 01.07.2017 International short research visits
178812 THz driven accelerator components 01.04.2018 Project funding (Div. I-III)
153036 Meta-material based THz applications in spectroscopy and electron optics 01.04.2014 Project funding (Div. I-III)

Abstract

Over the past years we have developed experimental techniques to study the electric near-field distribution of nano-structures in the THz spectral range. Recently we proposed and demonstrated that such structures can also be used advantageously in two different, yet related fields, namely in THz electron optical devices and THz spectroscopy. For example, in a recent publication we proposed a THz streak camera with sub-femtosecond time resolution. In the meantime our simulations have been verified by PSI and the device is currently under construction for testing at selected European accelerators.Here, we want to demonstrate, through simulations mostly, that such sub-wavelength THz structures may find further applications in electron trajectory manipulation. Since electrons and THz pulses can be generated from the same laser system, synchronization of THz driven components to the gun is inherently guaranteed, which is a tremendous advantage. Specifically, we would like to investigate different THz structures for electron acceleration and also structures which may be considered as the THz-driven analogues of an undulator or a wiggler. After finishing and publishing the simulation results, we will collaborate with dedicated research institutes to realize and experimentally verify our proposed structures. This approach has worked out well in the past.The second project deals with the application of suitable sub-wavelength structures in THz spectroscopy. Here, we want to make use of the giant near-field enhancement factors which are found in specially designed sub-wavelength THz structures and which we demonstrated in the past. Our first goal is to drive the field enhancement to the extreme by reducing the size of the gap in nano-slits to the single molecular layer limit. With such arrangements we will study the possibilities of THz near-field enhanced spectroscopy.
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