Session Overview |
Nonlinear Optics, Nanophotonics and Plasmonics - Bloc 3Room: Cartier 2 |
Date: Wednesday, June 06 |
15:30 |
Non Linear Electrodynamics Response in Dirac Electron Materials
Main Author: Stefano Lupi Organization: Sapienza University of Rome, Italy Topological Insulators and Dirac 3D systems are characterized at low energy by massless Dirac carriers. Their electrodynamics response is intrinsically non-linear showing a variety of behavior spanning from electromagnetic induced transparency, harmonic generation, and plasmon softening. In this talk, I will discuss our recent results on the terahertz electrodynamics in Bi2Se3 Topological Insulator and Cd3As2 3D Dirac material, discussing the evolution of their electromagnetic response from a linear to a non-linear behavior versus the applied terahertz electric field [1,2,3]. |
15:55 |
Advances in ultrafast terahertz scanning tunneling microscopy
Main Author: Frank Hegmann Organization: University of Alberta, Canada To be announced |
16:20 |
Advanced THz pulse shaping and applications
Main Author: David Cooke Organization: McGill University, Canada Control over the temporal profile of a phase-locked terahertz (THz) pulse is an important step towards multi-dimensional nonlinear spectroscopy in the THz band and can be used to imprint information on a THz bit stream for wireless communication. In this work we demonstrate such a THz pulse shaper based on a dynamic optically-addressable waveguide and discuss several applications. |
16:45 |
Terahertz vortex phase plate from a printed electronic device
Main Author: François Blanchard Organization: École de technologie supérieure, Canada We demonstrate the terahertz (THz) transmission properties of printed electronic devices. An ultrathin vortex phase plate (VPP) has been fabricated by inkjet printing technology and our experimental results confirmed its expected resonance at 220 GHz. We show that printable electronics are a promising technique for fabricating ultrathin VPP in the THz frequency range. |
17:00 |
Optimizing the Nonlinear Terahertz Response of Graphene in a Parallel-Plate Waveguide
Main Author: Parvin Navaeipour Organization: Queen's University, Canada Third-harmonic generation of terahertz radiation can occur in graphene due to the nonlinear relationship between the crystal momentum and the current density. In this work, we calculate the terahertz nonlinear response of graphene inside a parallel-plate waveguide and show that by optimizing the plate separation and Fermi energy of the graphene, the power efficiency can be up to 68%. |
17:15 |
How optical phonon scattering can enhance the transmission of terahertz fields through graphene
Main Author: Luke Helt Organization: Queen's University, Canada We consider the terahertz response of monolayer n-doped graphene, and calculate transmission spectra using a microscopic theory of carrier dynamics. |
17:30 |
Compact wire grid Fabry Perot interferometer for terahertz radiation analysis
Main Author: Ivan Konoplev Organization: Department of Physics, University of Oxford, United Kingdom The design of a compact Fabry-Perot (FP) interferometer and results of the experimental studies carried out using the device are presented. The FP interferometer uses freestanding wire-grid (WG) polarizers as beam-splitters (BS) and it is suitable for use at terahertz (THz) frequencies. The WG-FP interferometer was studied at the LUCX accelerator facility, KEK, Japan, which was used to generate coherent Smith-Purcell radiation (cSPr) in THz frequency range. The WG-FP interferometer was designed to be easy to align and reposition, capable of operating in broad THz frequency range without reference to the material properties. The performance of the FP interferometer with WG polarizers (WG-FP) was compared to that of a Michelson interferometer and FP interferometer is seen to perform well. Measurements made with WG-FP interferometer are compared to measurements made with the FP interferometer using silicon wafers as alternative beam-splitters. The successful measurements taken with the WG-FP interferometer demonstrate reliability of a compact and adaptable interferometer that is capable of analyzing THz radiation over a broad frequency range. The scheme is particularly well suited for example for polarization studies of THz radiation produced in a challenging environment of accelerator facility. |
17:45 |
Characterization of thin-film optical properties by THz near-field imaging
Main Author: François Blanchard Organization: École de technologie supérieure, Canada We present a method for characterization of thin-film eletro- or magneto-optic materials. Our tool is based on resolving the electric and magnetic field distributions in the near field of a split ring (SRR) resonator designed for the terahertz frequency range. Here, we experimentally validate our simulations by near-field THz imaging of a SRR directly patterned in contact with a thin-film lithium niobate crystal. |