Itai Epstein
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View article: Strongly Coupled Exciton–Hyperbolic‐Phonon‐Polariton Hybridized States in hBN‐Encapsulated Biased Bilayer Graphene
Strongly Coupled Exciton–Hyperbolic‐Phonon‐Polariton Hybridized States in hBN‐Encapsulated Biased Bilayer Graphene Open
Excitons in biased bilayer graphene are electrically tunable optical excitations residing in the mid‐infrared (MIR) spectral range, where intrinsic optical transitions are typically scarce. Such a tunable material system with an excitonic …
View article: Transmission line model for two-dimensional materials and van der Waals heterostructures
Transmission line model for two-dimensional materials and van der Waals heterostructures Open
Van der Waals heterostructures (VdWHs) composed of 2D materials have attracted significant attention in recent years due to their intriguing optical properties, such as strong light-matter interactions and large intrinsic anisotropy. In pa…
View article: Strongly Coupled Exciton--Hyperbolic-phonon-polariton Hybridized States in hBN-encapsulated Biased Bilayer Graphene
Strongly Coupled Exciton--Hyperbolic-phonon-polariton Hybridized States in hBN-encapsulated Biased Bilayer Graphene Open
Excitons in biased bilayer graphene are electrically tunable optical excitations residing in the mid-infrared (MIR) spectral range, where intrinsic optical transitions are typically scarce. Such a tunable material system with an excitonic …
View article: Nanometer-Scale Cavities for Mid-Infrared Radiation via Image Phonon Polariton Resonators
Nanometer-Scale Cavities for Mid-Infrared Radiation via Image Phonon Polariton Resonators Open
Surface polaritons play a pivotal role in strong light-matter interactions at the nanoscale due to their ability to confine light to deep-subwavelength dimensions. A promising class of materials exhibiting such a polaritonic response is po…
View article: The Importance of Pure Dephasing in the Optical Response of Excitons in High-quality van der Waals Heterostructures
The Importance of Pure Dephasing in the Optical Response of Excitons in High-quality van der Waals Heterostructures Open
Excitons in monolayer transition metal dichalcogenides (TMDs) dominate their optical response due to exceptionally large binding energies arising from their two-dimensional nature. Several theoretical models have been proposed to describe …
View article: Electrically Tunable Interband Collective Excitations in Biased Bilayer and Trilayer Graphene
Electrically Tunable Interband Collective Excitations in Biased Bilayer and Trilayer Graphene Open
Collective excitations of charged particles under the influence of an electromagnetic field give rise to a rich variety of hybrid light-matter quasiparticles with unique properties. In metals, intraband collective response manifested by ne…
View article: 2D Semiconductors Superlattices as Hyperbolic Materials
2D Semiconductors Superlattices as Hyperbolic Materials Open
Hyperbolic materials are natural or engineered artificial structures that provide means to manipulate and control electromagnetic radiation, leading to a variety of strong light-matter interactions at the nanoscale. In this work, we explor…
View article: In-plane exciton polaritons versus plasmon polaritons: Nonlocal corrections, confinement, and loss
In-plane exciton polaritons versus plasmon polaritons: Nonlocal corrections, confinement, and loss Open
Polaritons are quasi-particles describing the coupling between a photon and a\nmaterial excitation, which can carry large momentum and confine electromagnetic\nfields to small dimensions, enabling strong light-matter interactions. In the\n…
View article: Extending the propagation length of graphene plasmons via nonlinear frequency conversion
Extending the propagation length of graphene plasmons via nonlinear frequency conversion Open
Graphene plasmons (GPs) are broadband and electrically tunable mid-infrared (MIR)/terahertz (THz) excitations, exhibiting high confinement factors exceeding two orders of magnitude. Such highly confined modes are extremely attractive for n…
View article: Absorption and optical selection rules of tunable excitons in biased bilayer graphene
Absorption and optical selection rules of tunable excitons in biased bilayer graphene Open
Biased bilayer graphene, with its easily tunable band gap, presents itself as the ideal system to explore the excitonic effect in graphene-based systems. In this paper we study the excitonic optical response of such a system by combining a…
View article: Absorption and optical selection rules of tunable excitons in biased bilayer graphene
Absorption and optical selection rules of tunable excitons in biased bilayer graphene Open
Biased bilayer graphene, with its easily tunable band gap, presents itself as the ideal system to explore the excitonic effect in graphene based systems. In this paper we study the excitonic optical response of such a system by combining a…
View article: Nanometer-scale cavities for mid-infrared light based on graphene plasmons
Nanometer-scale cavities for mid-infrared light based on graphene plasmons Open
Acoustic-graphene-plasmons (AGPs) are highly confined electromagnetic modes, which carry extreme momentum and low loss in the Mid-infrared (MIR) to Terahertz (THz) spectra. They are therefore enablers of extremely strong light-matter inter…
View article: Demonstration of ultra-small MIR acoustic-graphene-plasmon cavities based on magnetic resonators
Demonstration of ultra-small MIR acoustic-graphene-plasmon cavities based on magnetic resonators Open
Acoustic-graphene-plasmons (AGPs) are highly confined electromagnetic modes, which carry extreme momentum and low loss in the Mid-infrared (MIR) to Terahertz (THz) spectra. They are therefore enablers of extremely strong light-matter inter…
View article: Quantum Nanophotonics in Two-Dimensional Materials
Quantum Nanophotonics in Two-Dimensional Materials Open
The field of two-dimensional (2D) materials-based nanophotonics has been growing at a rapid pace, triggered by the ability to design nanophotonic systems with in situ control, unprecedented number of degrees of freedom, and to build materi…
View article: Understanding the electromagnetic response of Graphene/Metallic nanostructures hybrids of different dimensionality
Understanding the electromagnetic response of Graphene/Metallic nanostructures hybrids of different dimensionality Open
Plasmonic excitations, such as surface-plasmonpolaritons (SPPs) and graphene-plasmons (GPs), carry large momenta and are thus able to confine electromagnetic fields to small dimensions. This property makes them ideal platforms for subwavel…
View article: Near-Unity Light Absorption in a Monolayer WS<sub>2</sub> Van der Waals Heterostructure Cavity
Near-Unity Light Absorption in a Monolayer WS<sub>2</sub> Van der Waals Heterostructure Cavity Open
Excitons in monolayer transition-metal-dichalcogenides (TMDs) dominate their optical response and exhibit strong light-matter interactions with lifetime-limited emission. While various approaches have been applied to enhance light-exciton …
View article: Far-field Excitation of Singular Graphene Plasmon Cavities with Ultra-compressed Mode Volumes
Far-field Excitation of Singular Graphene Plasmon Cavities with Ultra-compressed Mode Volumes Open
Acoustic-graphene-plasmons (AGPs) are highly confined electromagnetic modes, carrying large momentum and low loss in the mid-infrared/Terahertz spectra. Owing to their ability to confine light to extremely small dimensions, they bear great…
View article: Demonstration of Ultra-small MIR Acoustic-graphene-plasmon Cavities Based on Magnetic Resonators
Demonstration of Ultra-small MIR Acoustic-graphene-plasmon Cavities Based on Magnetic Resonators Open
Acoustic-graphene-plasmons (AGPs) are highly confined electromagnetic modes, which carry extreme momentum and low loss in the Mid-infrared (MIR) to Terahertz (THz) spectra. In this work [1], we demonstrate a new way to excite AGPs from the…
View article: Unitary Light-2D matter Interaction and Universal Absorption in a Monolayer $\mbox{WS}_2$ Van der Waals Heterostructure Cavity
Unitary Light-2D matter Interaction and Universal Absorption in a Monolayer $\mbox{WS}_2$ Van der Waals Heterostructure Cavity Open
Excitons in monolayer transition-metal-dichalcogenides (TMDs) dominate their optical response and exhibit strong light-matter interactions with lifetime-limited emission. While various approaches have been applied to enhance light-exciton …
View article: Optomechanical Measurement of Thermal Transport in Two-Dimensional MoSe<sub>2</sub> Lattices
Optomechanical Measurement of Thermal Transport in Two-Dimensional MoSe<sub>2</sub> Lattices Open
Nanomechanical resonators have emerged as sensors with exceptional sensitivities. These sensing capabilities open new possibilities in the studies of the thermodynamic properties in condensed matter. Here, we use mechanical sensing as a no…
View article: Probing the ultimate plasmon confinement limits with a van der Waals heterostructure
Probing the ultimate plasmon confinement limits with a van der Waals heterostructure Open
Light confined to a single atomic layer The development of nanophotonic technology is reliant on the ability to confine light to spatial dimensions much less than the wavelength of the light itself. Typically, however, in metal plasmonic a…
View article: Probing the Ultimate Plasmon Confinement Limits with a Van der Waals heterostructure
Probing the Ultimate Plasmon Confinement Limits with a Van der Waals heterostructure Open
The ability to confine light into tiny spatial dimensions is important for applications such as microscopy, sensing and nanoscale lasers. While plasmons offer an appealing avenue to confine light, Landau damping in metals imposes a trade-o…
View article: Observation of linear plasmonic breathers and adiabatic elimination in a plasmonic multi-level coupled system
Observation of linear plasmonic breathers and adiabatic elimination in a plasmonic multi-level coupled system Open
We provide experimental and numerical demonstrations of plasmonic propagation dynamics in a multi-level coupled system, and present the first observation of plasmonic breathers propagating in such systems. The effect is observed both for t…
View article: Generation of intensity-controlled two-dimensional shape-preserving beams in plasmonic lossy media
Generation of intensity-controlled two-dimensional shape-preserving beams in plasmonic lossy media Open
Two-dimensional surface-plasmon polariton waves, which propagate at a metal/dielectric interface, exhibit unique and attractive properties. These extraordinary properties, however, are accompanied by fundamentally inherent losses. The latt…