Abstract The magnetic circular dichroism and the Faraday rotation are fundamental phenomena of great practical importance arising from breaking time reversal symmetry by a field. In most materials, strength sign these effects can be only controlled field value its orientation. Furthermore, terahertz range is lacking materials having ability to affect polarization state light in non-reciprocal manner. Here we demonstrate, using broadband magneto-electro-optical spectroscopy, that graphene...

Abstract Integrating and manipulating the nano-optoelectronic properties of Van der Waals heterostructures can enable unprecedented platforms for photodetection sensing. The main challenge infrared photodetectors is to funnel light into a small nanoscale active area efficiently convert it an electrical signal. Here, we overcome all those challenges in one device, by efficient coupling plasmonic antenna hyperbolic phonon-polaritons hexagonal-BN highly concentrate mid-infrared graphene p n...

Hexagonal boron nitride (hBN) hosts long-lived phonon polaritons, yielding a strong mid-infrared (mid-IR) electric field enhancement and concentration on the nanometer scale. It is thus promising material for highly sensitive mid-IR sensing spectroscopy. In addition, hBN possesses high chemical thermal stability as well mechanical durability, making it suitable operation in demanding environments. this work, we demonstrate CO2 gas sensor exploiting polariton (PhP) modes nanoresonators...

We employ tip-enhanced infrared near-field microscopy to study the plasmonic properties of epitaxial quasi-free-standing monolayer graphene on silicon carbide. The images reveal propagating plasmons, as well a strong plasmon reflection at gaps in layer, which appear steps between SiC terraces. When step height is around 1.5 nm, two orders magnitude smaller than wavelength, signal reaches 20% its value edges, and it approaches 50% for heights small 5 nm. This intriguing observation...

An analytical method for diffraction of a plane electromagnetic wave at periodically-modulated graphene sheet is presented. Both interface corrugation and periodical change in the optical conductivity are considered. Explicit expressions reflection, transmission, absorption transformation coefficients arbitrary orders The dispersion relation decay rates plasmons grating found. Simple value band gap vicinity first Brillouin zone edge derived. optimal amplitude wavelength, guaranteeing best...

Graphene plasmons (GPs) exhibit extreme confinement of the associated electromagnetic fields. For that reason, they are promising candidates for controlling light in nanoscale devices. However, despite ubiquitous presence surface corrugations graphene, very little is known on how affect propagation GPs. Here we perform a comprehensive theoretical analysis GP scattering by both smooth and sharp corrugations. corrugations, demonstrate GPs depends dielectric environment, being strongly...

We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside gap. The collective excitations are a network chiral edge (CEP) entirely composed in topological electronic states (EES) that appear at AB-BA interfaces. CEP form an hexagonal with unique energy scale $\epsilon_p=\frac{e^2}{\epsilon_0\epsilon t_0}$ $t_0$ moir\'e lattice constant and $\epsilon$ dielectric constant. From matrix we obtain plasmon spectra has two main characteristics: (i) diverging density...

Phonon polaritons - quasiparticles formed by strong coupling of infrared (IR) light with lattice vibrations in polar materials can be utilized for surface-enhanced absorption (SEIRA) spectroscopy and even vibrational nanoscale amounts molecules. Here, we introduce demonstrate a compact on-chip phononic SEIRA platform, which is based on an h-BN/graphene/h-BN heterostructure top metal split-gate creating p-n junction graphene. The concentrates the incident launches hyperbolic phonon (HPhPs)...

Faraday rotation is a fundamental property present in all non-reciprocal optical elements. In the THz range, graphene displays strong rotation; unfortunately, it limited to frequencies below cyclotron resonance. Here we show experimentally that specifically design metasurfaces, magneto-plasmons can be used circumvent this limitation. We find excellent agreement between theory and experiment provide new physical insights predictions on these phenomena. Finally, demonstrate tuneability...

We discuss the propagation of symmetric and antisymmetric Josephson plasma waves in a slab layered superconductor clad between two identical dielectrics. predict branches surface terahertz frequency range, one above another below frequency. Apart from this, there exists discrete set waveguide modes with electromagnetic fields oscillating across thickness decaying exponentially away slab. consider excitation predicted by means attenuated-total-reflection method. It is shown that for specific...

This is a theoretical study of the resonant suppression specular reflection terahertz waves in layered superconductors due to excitation surface Josephson plasma (SJPWs). Here, we consider detail specific case SJPW excitations by evanescent electromagnetic via attenuated total incident dielectric prism. We also derive dispersion relation for propagating along vacuum-superconductor interface parallel $\mathbf{a}\mathbf{b}$ plane. show that, excitation, reflectivity wave depends resonantly on...

We analytically examine the excitation of surface Josephson plasma waves (SJPWs) in layered superconductors by an incident electromagnetic wave. The mechanism is related to diffraction wave due a small periodic modulation $\mathbf{a}\mathbf{b}$ plane maximum $\mathbf{c}$-axis current density. show that absorption can be substantially increased, for certain angles, resonance SJPWs. increase accompanied decrease specular reflection. Moreover, we find dependence value angle on parameters...

We predict the enhanced transmissivity of modulated slabs layered superconductors for terahertz radiation due to diffraction incident wave and resonance excitation eigenmodes. The electromagnetic field is transferred from irradiated side a slab superconductor other one by excited waveguide modes (WGMs) which do not decay deep into slab, contrary metals, where light transmission caused evanescent surface waves. show that series peaks (with $T \sim 1$) can be observed in dependence...

We analytically study the excitation of surface Josephson plasma waves (SJPWs) propagating across junctions in layered superconductors presence external dc magnetic field. Both attenuated total reflection and modulation superconducting parameters methods SJPWs are considered. show that incident electromagnetic wave can be substantially decreased due to resonance SJPWs, for certain angles frequencies when changing Moreover, we find physical conditions guaranteeing suppression specular...

We consider here a layered superconductor subject to an externally applied moderately strong electromagnetic field. predict hysteretic jumps in the dependence of surface reactance on amplitude ${H}_{0}$ incident wave. This very unusual nonlinear phenomenon can be observed thin superconducting slabs at not ac amplitudes if frequency irradiating field is close Josephson plasma frequency. Using set coupled sine-Gordon equations, we derive expression for phase shift $\ensuremath{\chi}$ reflected...

The paper shows that the Faraday rotation angle can be strongly enhanced by straining graphene in presence of small magnetic fields (easily reachable with permanent magnets). Strain provides a large pseudo-magnetic gauge field, while external field produces breaking time-reversal symmetry needed to obtain any non-reciprocal effect, such as rotation.

Abstract Studying the collective excitations in charge neutral graphene (CNG) has recently attracted a great interest because of unusual mechanisms carrier dynamics. The latter can play crucial role for formation observed twisted bilayer CNG plasmon polaritons (GPPs) associated with interband transitions between flat electronic bands. Besides, GPPs be tool providing insights into various quantum phenomena via optical experiments. However, properties are not known, even simplest...

We present a very-compact bicomponent-permanent-magnet design capable of generating 1.25 T in small volume, significantly above the 0.6 available from single uniformly magnetized permanent magnet. In addition to enhanced maximum field, our drastically limits stray field around standard These features make it suitable for retrofitting existing experiments with substantial magnetic particular, scanning probes and optical, Raman, photoemission spectroscopy, diverse environments, ambient...

The nonlinear response of a layered superconductor to symmetric (in magnetic field) electromagnetic excitation has been theoretically investigated. An ambiguous dependence the phase reflected signal on amplitude H0 irradiating wave is predicted. This causes hysteresis jumps in surface reactance H0. If frequency field close Josephson plasma frequency, this unusual effect can be observed when amplitudes ac are not very strong. conditions for appearance obtained. Expressions shift derived,...

It is predicted that the time dependence of electric field at surface a superconducting slab carrying transport current will have jumps occur as result interaction with electromagnetic wave. A theoretical analysis phenomenon carried out in simple model for arbitrary monotonic critical density on magnetic induction. The value jump amplitude wave and strength investigated. effect can be observed experimentally by measuring emf coil wound plane perpendicular to external ac field.

The rigorous excitation equations are used to analyze wave propagation in a rectangular waveguide section with sharp periodic corrugations whose height is much greater than the period. It has been shown that Brillouin diagram of corrugated and regular waveguides case strong gradient scattering characterized by qualitatively same frequency dependence longitudinal wavenumber. only difference cutoff frequencies modes increase decreasing corrugation period, it always possible implement...

In this paper the surface Josephson plasma wave (SJPW) excitation on periodically-modulated layered superconductor is considered. It shown that absorption of incident electromagnetic can be substantially increased at certain angles due to resonance waves. The optimal combinations parameters problem (modulation amplitude, wavelength, angle) corresponding maximum SJPW and effect total suppression specular reflection (TSSR) are found for a real medium (Bi2212).