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Complex THz meta-materials

English title Complex THz meta-materials
Applicant Feurer Thomas
Number 140943
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 01.04.2012 - 31.03.2014
Approved amount 268'319.00
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Keywords (3)

THz meta-materials; THz near-field imaging; THz 3D reconstruction

Lay Summary (English)

Lead
Lay summary
With the advent of meta-materials, which are mostly composed
sub-wavelength resonating structures, unprecedented electromagnetic
material properties became accessible. These unusual properties are
based on the microscopic electric and magnetic response of the
constituting building blocks to an incident electromagnetic wave.
So far, meta-materials are mostly characterized by far-field
measurements and current studies of the microscopic electromagnetic
response often rely on numerical simulations. Over the past years
we have developed two complementary experimental techniques to
measure the vector electric near-field distributions in the THz
spectral range. In addition, we identified different fabrication
processes for highly flexible fabrication of such meta-atoms. We
have investigated the near-field distribution of several
meta-atoms, couplings between them, and couplings to lattice modes
once they are arranged in a periodic 2D array. The overall theme of
the proposal here is to investigate and apply homogeneous
meta-materials with highly complex unit cells and inhomogeneous
meta-materials in order to derive new functionalities in THz pulse
shaping and THz coherent control on one side and THz beam steering
and imaging on the other side. At the same time we continue to
develop new imaging tools, specifically THz tomography, to study
THz propagation through media which are composed of random or
ordered THz meta-atoms.

First, we want to measure the electric and magnetic near fields of
a subset of meta-atoms, namely structures which are chiral and can
be used for polarization control. Second, we want to investigate
homogeneous meta-materials with highly complex unit cells. The
scientific driver behind this is to explore new avenues to generate
arbitrary THz waveforms through tailored material dispersion and to
apply these waveforms for THz coherent control experiments, here,
of meta-materials. Third, we want to investigate inhomogeneous
meta-materials, first in two-dimensional and later in
three-dimensional arrays. Such materials can be used for beam
steering, imaging applications, or more complex THz wave vector
manipulations. Fourth, we would like to continue our efforts to
reconstruct three-dimensional objects with complex dielectric
constants through a suitable processing of a set of four near-field
measurements.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Numerical study of Anderson localization of terahertz waves in disordered waveguides
Lapointe C.P., Zakharov P., Enderli F., Feurer T., Skipetrov S.E., Scheffold F. (2014), Numerical study of Anderson localization of terahertz waves in disordered waveguides, in EPL, 105, 34002.
Skirting terahertz waves in a photo-excited nanoslit structure
Shalaby M., Fabianska J., Peccianti M., Ozturk Y., Vidal F., Sigg H., Morandotti R., Feurer T. (2014), Skirting terahertz waves in a photo-excited nanoslit structure, in Pllied Physics Letters, 104, 171115.
Coherent Control of THz Meta-Materials
Enderli F., Feurer T. (2013), Coherent Control of THz Meta-Materials, in Applied Physics Letters, 103, 6.
Terahertz macrospin dynamics in insulating ferrimagnets
Shalaby M., Vidal F., Peccianti M., Morandotti R., Enderli F., Feurer T., Patterson B.D. (2013), Terahertz macrospin dynamics in insulating ferrimagnets, in Phys. Rev. B, 88, 140301.
Optimization-Based Terahertz Imaging
Rho T.H., Enderli F., Feurer T., Webb K. (2012), Optimization-Based Terahertz Imaging, in IEEE Transactions on THz science and Technology, 2(5), 493-503.

Collaboration

Group / person Country
Types of collaboration
Prof. K. Webb United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. F. Scheffold Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Prof. Morandotti Canada (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Ch. David Switzerland (Europe)
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
International Workshop on Optical Terahertz Science and Technologies (OTST) Poster THz field-enhancement modulation in optically shunted gold nanoslit arrays 01.04.2013 Kyoto, Japan Fabianska Justyna;
International Workshop on Optical Terahertz Science and Technologies (OTST) Poster Giant electric field enhancement in a split ring resonator featuring a nano-gap 01.04.2013 Kyoto, Japan Enderli Florian; Fabianska Justyna;
International Workshop on Optical Terahertz Science and Technologies (OTST) Poster THz second harmonic generation mediated by electric field enhancement in nano-slits 01.04.2013 Kyoto, Japan Fabianska Justyna; Enderli Florian;
ALC workshop Talk given at a conference Fundamentals of THz generation, propagation, and detection 16.11.2012 Windhoek, Namibia Feurer Thomas;
ALC workshop Talk given at a conference THz spectroscopy and imaging 14.11.2012 Windhoek, Namibia Feurer Thomas;
Physics Colloquium Individual talk Lasers meet accelerators 09.11.2012 University of Stellenbosch, South Africa Feurer Thomas;
6th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics Poster Planar THz Metamaterial with Chiral Symmetry Breaking 17.09.2012 St. Petersburg, Russia Enderli Florian; Fabianska Justyna;
6th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics Talk given at a conference High electric field enhancement in THz regime using a gold-nanoslit filled with Lithium Niobate oxide 17.09.2012 St. Petersburg, Russia Enderli Florian; Fabianska Justyna;
ALT'12 Talk given at a conference THz spectroscopy and imaging 04.09.2012 Thun, Switzerland Feurer Thomas;
9th International Conference on Nanosciences & Nanotechnologies Poster Giant Field Enhancement in Split-Ring-Resonators Featuring Nano-Gaps 03.07.2012 Thesaloniki, Greece Fabianska Justyna;


Communication with the public

Communication Title Media Place Year
Media relations: print media, online media THz, the frequency of the future International Innovation International 2012

Awards

Title Year
Best PhD Thesis (Phil.-Nat. Fak.) for Hannes Merbold 2012
Best Poster Award 2012

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)
130391 THz near-field imaging of meta-materials and related structures 01.04.2010 Project funding (Div. I-III)
130391 THz near-field imaging of meta-materials and related structures 01.04.2010 Project funding (Div. I-III)

Abstract

First, we want to measure the electric and magnetic near fields of a subset of meta-atoms, namely structures which are chiral and can be used for polarization control. Chirality is the last missing property in our tool box of THz meta-atoms and with that we should then be able to compose THz materials with a large variety of dielectric tensor properties. Second, we want to investigate homogeneous meta-materials with highly complex unit cells. The scientific driver behind this is to explore new avenues to generate arbitrary THz waveforms through tailored material dispersion and to apply these waveforms for THz coherent control experiments, here, of meta-materials. Third, we want to investigate inhomogeneous meta-materials, first in two-dimensional and later in three-dimensional arrays. Such materials can be used for beam steering, imaging applications, or more complex THz wave vector manipulations. Fourth, we would like to continue our efforts to reconstruct three-dimensional objects with complex dielectric constants through a suitable processing of a set of four near-field measurements and use this method in combination with all other developed previously to study THz radiation transport through media composed of oriented or random meta-atoms in general.
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