202 citations · 892 across the 15 of their papers we have counts for
19 papers
Front-induced transitions control THz waves
Aidan W. Schiff-Kearn, Lauren Gingras, Simon Bernier +4
Relativistically moving dielectric perturbations can be used to manipulate light in new and exciting ways beyond the capabilities of traditional nonlinear optics. Adiabatic interac…
Extreme Lightwave Electron Field Emission from a Nanotip
Dominique Matte, Nima Chamanara, Lauren Gingras +4
We report on sub-cycle terahertz light-field emission of electrons from tungsten nanotips under extreme conditions corresponding to a Keldysh parameter . Local p…
Linear Pulse Compansion using Co-propagating Space-Time Modulation
Nima Chamanara, Christophe Caloz
This paper presents a pulse compansion, i.e. compression or expansion, technique based on co-propagating space-time modulation. An engineered asymmetric space-time modulated medium…
Wave Scattering by a Cylindrical Metasurface Cavity of Arbitrary Cross-Section: Theory and Applications
Mojtaba Dehmollaian, Nima Chamanara, Christophe Caloz
This paper presents a technique, combining the integral equations (IE) and the Generalized Sheet Transition Conditions (GSTCs) with bianisotropic susceptibility tensors, to compute…
Simultaneous Control of the Spatial and Temporal Spectra of Light with Space-Time Varying Metasurfaces
Nima Chamanara, Yousef Vahabzadeh, Christophe Caloz
This paper presents space-time varying (STV) metasurfaces for simultaneously controlling the spatial and temporal spectra of electromagnetic waves. These metasurfaces transform inc…
Optimal stopping via reinforced regression
Denis Belomestny, John Schoenmakers, Vladimir Spokoiny +1
In this note we propose a new approach towards solving numerically optimal stopping problems via reinforced regression based Monte Carlo algorithms. The main idea of the method is…
Inverse Prism based on Temporal Discontinuity and Spatial Dispersion
Alireza Akbarzadeh, Nima Chamanara, Christophe Caloz
We introduce the concept of the inverse prism as the dual of the conventional prism and deduce from this duality an implementation of it based on temporal discontinuity and spatial…
Computational Analysis of Metasurfaces
Yousef Vahabzadeh, Nima Chamanara, Karim Achouri +1
Metasurfaces represent one of the most vibrant fields of modern science and technology. A metasurface is a complex electromagnetic structure, that is typically deeply subwavelength…
New Electromagnetic Modes in Space-Time Modulated Dispersion-Engineered Media
Nima Chamanara, Zoé-Lise Deck-Léger, Christophe Caloz +1
We report on new electromagnetic modes in space-time modulated dispersion-engineered media. These modes exhibit unusual dispersion relation, field profile and scattering properties…
Efficient GSTC-FDTD Simulation of Dispersive Bianisotropic Metasurface
Yousef Vahabzadeh, Nima Chamanara, Christophe Caloz
We present a simple and efficient Finite-Difference Time-Domain (FDFD) scheme for simulating dispersive (Lorentz-Debye) bianisotropic metasurfaces. This scheme replaces the convent…
Frequency Vectoralization and Frequency Birefringence
Alireza Akbarzadeh, Nima Chamanara, Christophe Caloz
In view of momentum continuity at a temporal slab, it is shown that instantaneous switching of an isotropic medium to an anisotropic medium offers the incident frequency a directio…
Nonreciprocal Electromagnetic Scattering from a Periodically Space-Time Modulated Slab and Application to a Quasisonic Isolator
Sajjad Taravati, Nima Chamanara, Christophe Caloz
Scattering of obliquely incident electromagnetic waves from periodically space-time modulated slabs is investigated. It is shown that such structures operate as nonreciprocal harmo…
Efficient Analysis of Metasurfaces in Terms of Spectral-Domain GSTC Integral Equations
Nima Chamanara, Karim Achouri, Christophe Caloz
We present a spectral-domain (SD) technique for the efficient analysis of metasurfaces. The metasurface is modeled by generalized sheet transition conditions (GSTCs) as a zero-thic…
Generalized Sheet Transition Condition FDTD Simulation of Metasurface
Yousef Vahabzadeh, Nima Chamanara, Christophe Caloz
We propose an FDTD scheme based on Generalized Sheet Transition Conditions (GSTCs) for the simulation of polychromatic, nonlinear and space-time varying metasurfaces. This scheme c…
Optical Isolation based on Space-time Engineered Asymmetric Photonic Bandgaps
Nima Chamanara, Sajjad Taravati, Zoé-Lise Deck-Léger +1
Nonreciprocal electromagnetic devices play an important role in modern optical and microwave technologies. Conventional methods for realizing such systems are incompatible with int…
Spacetime Processing Metasurfaces: GSTC Synthesis and Prospective Applications
Nima Chamanara, Yousef Vahabzadeh, Karim Achouri +1
The paper presents the general concept of spacetime processing metasurfaces, synthesized by generalized sheet transition conditions (GSTCs). It is shown that such metasurfaces can…
PML Inspired Transparent Metamaterials
Nima Chamanara, Christophe Caloz
Perfectly transparent metamaterial structures of arbitrary shapes, constructed from coordinate stretching and contractions, are presented. Coordinate stretching has been used for 2…
Graphene Transverse Electric Surface Plasmon Detection using Nonreciprocity Modal Discrimination
Nima Chamanara, Christophe Caloz
We present a magnetically biased graphene-ferrite structure discriminating the TE and TM plasmonic modes of graphene. In this structure, the graphene TM plasmons interact reciproca…
Terahertz Magnetoplasmon Energy Concentration and Splitting in Graphene PN Junctions
Nima Chamanara, Dimitrios L. Sounas, Thomas Szkopek +1
Terahertz plasmons and magnetoplasmons propagating along electrically and chemically doped graphene p-n junctions are investigated. It is shown that such junctions support non-reci…