72 citations · 486 across the 18 of their papers we have counts for
19 papers
Enhanced nonlinear optical effects in drift-biased nonreciprocal graphene plasmonics
S. Ali Hassani Gangaraj, Boyuan Jin, Christos Argyropoulos +1
Nonlinear light-matter interactions are typically enhanced by increasing the local field and its interaction time with matter. Conventional methods to achieve these goals are based…
Enhancement of Quantum Excitation Transport by Photonic Nonreciprocity
S. Ali Hassani Gangaraj, Lei Ying, Francesco Monticone +1
Enhanced interaction between two two-level emitters (e.g., atoms) by nonreciprocal photonic media can be of benefit to broad areas, from quantum information science to biological d…
Chern Invariants of Topological Continua; a Self-Consistent Nonlocal Hydrodynamic Model
Samaneh Pakniyat, S. Ali Hassani Gangaraj, George W Hanson
The bulk-edge correspondence is a fundamental principle of topological wave physics, which states that the difference in gap Chern numbers between the interfaced materials is equal…
Drifting Electrons: Nonreciprocal Plasmonics and Thermal Photonics
S. Ali Hassani Gangaraj, Francesco Monticone
Light propagates symmetrically in opposite directions in most materials and structures. This fact -- a consequence of the Lorentz reciprocity principle -- has tremendous implicatio…
Do Truly Unidirectional Surface Plasmon-Polaritons Exist?
S. Ali Hassani Gangaraj, Francesco Monticone
In this work, we revisit the topic of surface waves on nonreciprocal plasmonic structures, and clarify whether strictly unidirectional surface plasmon-polaritons are allowed to exi…
Robust surface plasmon polaritons on gyrotropic interfaces
Samaneh Pakniyat, Alexander M. Holmes, George W. Hanson +5
Unidirectional surface plasmon polaritons (SPPs) at the interface between a gyrotropic medium and a simple medium are studied in a newly-recognized frequency regime wherein the SPP…
Non-Markovian Transient Casimir-Polder force and population dynamics on excited and ground state atoms: weak and strong coupling regimes in generally non-reciprocal environments
George W. Hanson, S. Ali Hassani Gangaraj, Mario G. Silveirinha +2
The transient Casimir-Polder force on a two-level atom introduced into a three-dimensional, inhomogeneous, generally non-reciprocal environment is evaluated using non-Markovian Wei…
Unidirectional and diffractionless surface plasmon-polaritons on three-dimensional nonreciprocal plasmonic platforms
S. Ali Hassani Gangaraj, George W. Hanson, Mario G. Silveirinha +3
Light-matter interactions in conventional nanophotonic structures typically lack directionality. Furthermore, surface waves supported by conventional material substrates do not usu…
Optical torque on a two-level system near a strongly nonreciprocal medium
S. Ali Hassani Gangaraj, Mário G. Silveirinha, George W. Hanson +2
We investigate the quantum optical torque on an atom interacting with an inhomogeneous electromagnetic environment described by the most general linear constitutive relations. The…
Momentum-Space Topological Effects of Nonreciprocity
S. Ali Hassani Gangaraj, George W. Hanson
The connection between topology and nonreciprocity in photonic systems is reviewed. Topological properties such as Chern number, and momentum-space properties such as Berry phase a…
Coupled Topological Surface Modes in Gyrotropic Structures: Green's Function Analysis
S. Ali Hassani Gangaraj, F. Monticone
At a transition in a wave-guiding structure, part of the incident energy is transmitted and part of the energy is reflected. When the waveguide has non-trivial topological properti…
Spontaneous lateral atomic recoil force close to a photonic topological material
S. Ali Hassani Gangaraj, George W. Hanson, Mauro Antezza +1
We investigate the quantum recoil force acting on an excited atom close to the surface of a nonreciprocal photonic topological insulator (PTI). The main atomic emission channel is…
Fluctuation-induced forces on an atom near a photonic topological material
Mário G. Silveirinha, S. Ali Hassani Gangaraj, George W. Hanson +1
We theoretically study the Casimir-Polder force on an atom in a arbitrary initial state in a rather general electromagnetic environment wherein the materials may have a nonreciproc…
Giant Interatomic Energy-Transport Amplification with Nonreciprocal Photonic Topological Insulators
Pierre Doyeux, S. Ali Hassani Gangaraj, George W. Hanson +1
We show that the energy-transport efficiency in a chain of two-level emitters can be drastically enhanced by the presence of a photonic topological insulator (PTI). This is obtaine…
Robust entanglement with 3D nonreciprocal photonic topological insulators
S. Ali Hassani Gangaraj, George W. Hanson, Mauro Antezza
We investigate spontaneous and pumped entanglement of two level systems in the vicinity of a photonic topological insulator interface, which supports a nonreciprocal (unidirectiona…
The effects of three-dimensional defects on one-way surface plasmon propagation for photonic topological insulators comprised of continuous media
S. Ali Hassani Gangaraj, Andrei Nemilentsau, George W. Hanson
We have investigated the one-way surface plasmon-polariton (SPP) at the interface of a continuous magneto-plasma material and metal. We demonstrated that TM modes inside a continuo…
Notes on photonic topological insulators and scattering-protected edge states - a brief introduction
George W. Hanson, S. Ali Hassani Gangaraj, Andrei Nemilentsau
The topic of photonic topological insulators and scattering-protected edge states bridges concepts from condensed matter physics and electromagnetics, and necessitates understandin…
Transient and steady-state entanglement mediated by three-dimensional plasmonic waveguides
S. Ali Hassani Gangaraj, Andrei Nemilentsau, George W. Hanson +1
Entanglement between two qubits (two level atoms) mediated by surface plasmons in three-dimensional plasmonic waveguides is studied using a quantum master equation formalism. Two t…
Quantum plasmonic excitation in graphene and robust-to-loss propagation
George W. Hanson, S. A. Hassani Gangaraj, Changhyoup Lee +2
We investigate the excitation of quantum plasmonic states of light in graphene using end-fire and prism coupling. In order to model the excitation process quantum mechanically we q…