Article
Nanoscience & Nanotechnology
Tiago A. Morgado, Mario G. Silveirinha
Summary: In this study, the nonreciprocal propagation and amplification of surface plasmons in drift-current biased graphene were investigated using two conductivity models. The results show that the drag effect caused by the drifting electrons leads to strongly nonreciprocal propagation of surface plasmons, and both models predict regimes of nonreciprocal plasmon amplification.
Article
Multidisciplinary Sciences
Y. Dong, L. Xiong, I. Y. Phinney, Z. Sun, R. Jing, A. S. McLeod, S. Zhang, S. Liu, F. L. Ruta, H. Gao, Z. Dong, R. Pan, J. H. Edgar, P. Jarillo-Herrero, L. S. Levitov, A. J. Millis, M. M. Fogler, D. A. Bandurin, D. N. Basov
Summary: The phenomenon of dragging light by moving media, predicted by Fresnel and verified by Fizeau, plays a key role in Einstein's special relativity theory. While experiments on dragging photons by an electron flow in solids have inconsistencies, the dragging of surface plasmon polaritons by an electron flow in graphene is a unique and complex phenomenon that challenges simple kinematics explanations.
Article
Chemistry, Multidisciplinary
Theis P. P. Rasmussen, A. Rodriguez Echarri, F. Javier Garcia de Abajo, Joel D. D. Cox
Summary: The subwavelength plasmonic near-field enhancement is hindered by large ohmic losses in good plasmonic materials, while conventional phase-matching of fields in bulk nonlinear crystals is not suitable for realizing nonlinear optical phenomena on the nanoscale. In contrast, highly-doped graphene supports long-lived, highly-confined, and actively-tunable plasmons, making it an excellent platform for both plasmonics and nonlinear optics. By interfacing multiple graphene nanostructures in close proximity, we can trigger nonlocal effects associated with large gradients in the electromagnetic near field to enhance nonlinear response.
Article
Nanoscience & Nanotechnology
Irati Alonso Calafell, Lee A. Rozema, David Alcaraz Iranzo, Alessandro Trenti, Philipp K. Jenke, Joel D. Cox, Avinash Kumar, Hlib Bieliaiev, Sebastien Nanot, Cheng Peng, Dmitri K. Efetov, Jin-Yong Hong, Jing Kong, Dirk R. Englund, F. Javier Garcia de Abajo, Frank H. L. Koppens, Philip Walther
Summary: Graphene-insulator-metal heterostructures exhibit significantly enhanced optical nonlinearity, offering potential for optically controlled and electrically tunable nano-optoelectronic devices.
NATURE NANOTECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
S. Ali Hassani Gangaraj, Francesco Monticone
Summary: Investigated a method to break reciprocity without relying on magneto-optical effects or spacetime modulations by biasing a plasmonic material with a direct electric current. Explored the propagation properties of surface plasmon-polaritons (SPPs) supported by this nonreciprocal platform and discovered previously overlooked anomalous wave-propagation effects. Clarified the impact of dissipation on nonreciprocal effects and revealed connections between inflection points, exceptional points at band-edges, and complex modal transitions. Theoretical demonstration of drift-induced nonreciprocal near-field radiative heat transfer in the field of thermal photonics.
Review
Optics
Kunal Shastri, Mohamed Ismail Abdelrahman, Francesco Monticone
Summary: The article explores the nonreciprocity and topology effects in plasmonic materials by translating relevant concepts from condensed-matter systems to photonics. This leads to the discovery of new regimes of truly unidirectional, backscattering-immune surface-wave propagation in various plasmonic systems.
Article
Optics
Samaneh Rasolian Lafmejani, Mehdi Khatir
Summary: In this paper, a new configuration of multi-layer surface plasmon polariton (SPP) slab waveguide using graphene, magneto-optic, and optical gain medium has been proposed and analyzed at the wavelength of 1550 nm. The results demonstrate that the five-layer waveguide increases propagation length and decreases loss, leading to the proposal of a magneto-optic plasmonic isolator with good isolation and low loss. This structure shows promise for applications in photonic integrated circuits.
Article
Materials Science, Multidisciplinary
M. Sanchez Sanchez, G. Gomez-Santos, T. Stauber
Summary: This paper discusses novel transverse plasmon polaritons in AA- and AB-stacked bilayer graphene and explains their magnetic excitation characteristics. For AA-stacked bilayer graphene, a symmetry-broken ground state leading to potential ferromagnetism is predicted, which might be relevant for the electronic properties of magic angle twisted bilayer graphene samples.
Article
Physics, Multidisciplinary
Mikkel Have Eriksen, Jakob E. Olsen, Christian Wolff, Joel D. Cox
Summary: This paper investigates the emergence and active control of optical bistability in a two-level atom near a graphene sheet. It is found that by adjusting the electrically tunable interband transition threshold in graphene, the emitted light from the atom exhibits electro-optical bistability and hysteresis in terms of intensity, spectrum, and quantum statistics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
W. J. M. Kort-Kamp, F. J. Culchac, F. S. S. Rosa, C. Farina, Rodrigo B. Capaz, F. A. Pinheiro
Summary: This study investigates the electromagnetic local density of states near a twisted bilayer graphene deposited on an isotropic substrate. The conductivity of the TBG shows a nontrivial dependence on the twist angle, leading to moire pattern-dependent quantum emission. The presence or absence of surface plasmon polaritons explains the impressive variation in LDOS at specific twist angles compared to monolayer graphene.
Article
Optics
Devashish Pandey, Sanshui Xiao, Martijn Wubs
Summary: This study investigates the sensitivity of the optical absorption of multilayer graphene structure to subnanometer interlayer separation. The results show that neglecting the interlayer separation leads to upper bounds on the absorption, while finite interlayer separations greatly affect the absorption. A closed-form analytical expression for the absorption is derived for an infinite number of graphene layers. The findings highlight the importance of considering subnanometer interlayer separations for accurate modeling and prediction of the optical properties of multilayer Van der Waals crystals suitable for coherent perfect absorption.
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This study investigates photonic-crystal-like devices and microcavities in graphene. The results show that these graphene-based devices can be significantly smaller in size compared to conventional photonic crystals, thanks to the shorter optical transport wavelength in graphene. By changing the applied voltage, the functionality of the devices can be altered, making them highly programmable and adjustable. Furthermore, these devices can be integrated with traditional microelectronic circuits, leading to potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This theoretical study investigates photonic-crystal-like devices and microcavities in graphene. The results show that graphene-based devices can be scaled down significantly compared to conventional photonic crystals due to the shorter optical transport wavelength in graphene. The devices have high programmability and can be integrated with traditional microelectronic circuits, offering potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Fedir O. Yevtushenko, Sergii Dukhopelnykov, Yuriy G. Rapoport, Tatiana L. Zinenko, Alexander Nosich
Summary: This study reports on a previously unexplored optical effect where a narrowband regime of electromagnetically induced transparency (EIT) is observed in a grating of narrow graphene strips. The tunability of reflectance and absorbance in this regime is significantly limited due to the field distribution pattern caused by lattice modes.
Article
Physics, Multidisciplinary
Hong-Qian Mu, Ying Zhou, Tong-Biao Wang, De-Jian Zhang, Wen-Xing Liu, Tian-Bao Yu, Qing-Hua Liao
Summary: The research discusses modulating the interaction between quantum emitters through a sandwich structure composed of graphene and hexagonal boron nitride, finding that the interaction of quantum emitters can be modulated by adjusting the chemical potential of graphene, thus switching between different radiative states.
Article
Physics, Multidisciplinary
Sylvain Lannebere, David E. Fernandes, Tiago A. Morgado, Mario G. Silveirinha
Summary: Inspired by semiconductor transistors, this study introduces a novel class of bulk materials with nonreciprocal and non-Hermitian electromagnetic response. The linearized permittivity tensor lacks Hermitian and transpose symmetries due to material nonlinearities combined with a static electric bias. By using an idealized MOSFET-metamaterial, an electromagnetic isolator is designed that can potentially outperform conventional Faraday isolators due to material gain. It is also suggested that similar material responses can be engineered in natural media in nonequilibrium situations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Sylvain Lannebere, Mario G. Silveirinha
Summary: This paper proposes a new paradigm for creating superlenses, inspired by the n-p-n junctions of graphene. By connecting an n-type region and a p-type region with a crystal dislocation, it is possible to mimic the interaction of complementary Hamiltonians and achieve subwavelength imaging. The paper introduces an effective model of the system and shows that it predicts perfect lensing for both propagating and evanescent waves.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Nuclear
Iver Brevik, Boris Shapiro, Mario G. Silveirinha
Summary: This paper discusses dispersion forces between neutral material bodies and introduces the concept of Casimir-Lifshitz forces. It also explores a lateral frictional force that occurs when bodies are in relative motion, known as quantum friction. The paper highlights conceptual issues with the theory and points out the problems with the dissipation-less plasma model. Additionally, it presents novel findings on quantum friction, including the possibility of non-stationary friction forces in weakly dissipative systems and an instability phenomenon where kinetic energy is transformed into exponentially growing coherent radiation.
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2022)
Article
Physics, Applied
Tiago A. Morgado, Guilherme L. Joao, Ricardo A. M. Pereira, David E. Fernandes, Sylvain Lannebere
Summary: We experimentally prove that a magnetic uniaxial wire medium lens composed of a racemic array of helical-shaped metallic wires can effectively transmit the normal component of the magnetic field of near-field sources with high resolution over a wide frequency range. This helical-shaped wire medium lens can be considered as the magnetic counterpart of traditional wire medium lenses formed by straight metallic wires. The experimental results are further confirmed through full-wave numerical simulations. We anticipate potential applications of this novel metamaterial lens in magnetic resonance imaging, near-field wireless power transfer, and sensing.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Tatiana G. Rappoport, Tiago A. Morgado, Sylvain Lannebere, Mario G. Silveirinha
Summary: The study finds that low-symmetry two-dimensional metallic systems can achieve distributed transistor response and characterizes the optical conductivity. By applying strain to bilayer graphene, optical gain can be realized, leading to a distributed transistor response.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Mario G. Silveirinha
Summary: Topological photonics offers a valuable framework to explain complex wave phenomena in electromagnetic systems. The topological index of a physical system is a global property dependent on the operators describing wave propagation. We establish a significant geometric connection between topological physics and the topological theory of mathematical surfaces. Our findings demonstrate that topological band theory extends the surface topological theory, wherein the surface genus can be considered as a Chern number of a suitable surface operator. We also explore the implications of topology in radiation problems and the bulk-edge correspondence in physical systems.
Article
Nanoscience & Nanotechnology
Filipa R. Prudencio, Mario G. Silveirinha
Summary: In this study, it is demonstrated that isorefractive spacetime crystals with a travelling-wave modulation can rigorously mimic the response of moving material systems. Unlike generic spacetime crystals, which exhibit bi-anisotropic coupling in the co-moving frame, isorefractive crystals show an observer-independent response, resulting in isotropic constitutive relations without any bianisotropy. The researchers show how this property can be utilized in calculating the band diagrams of isorefractive spacetime crystals in the laboratory frame and studying synthetic Fresnel drag. Additionally, the impact of considering either a Galilean or a Lorentz transformation in the homogenization of spacetime crystals is discussed, revealing that the effective response is independent of the transformation considered.
Article
Physics, Applied
Filipa R. Prudencio, Mario G. Silveirinha
Summary: We demonstrate that space-time modulations can be used to achieve complex nonreciprocal couplings, particularly the elusive axion response. We develop an analytical formalism for homogenizing anisotropic space-time crystals in the long wavelength limit and find that space-time crystals with appropriate glide-rotation symmetry can exhibit a giant axion-type response, several orders of magnitude larger than in natural materials. The nonreciprocal axion response has interesting potential applications in optics, such as electromagnetic isolation, and can enable exciting forms of light-wave interactions.
PHYSICAL REVIEW APPLIED
(2023)
Editorial Material
Multidisciplinary Sciences
Mario G. Silveirinha
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Optics
Konstantin Y. Bliokh, Ebrahim Karimi, Miles J. Padgett, Miguel A. Alonso, Mark R. Dennis, Angela Dudley, Andrew Forbes, Sina Zahedpour, Scott W. Hancock, Howard M. Milchberg, Stefan Rotter, Franco Nori, Sahin K. Ozdemir, Nicholas Bender, Hui Cao, Paul B. Corkum, Carlos Hernandez-Garcia, Haoran Ren, Yuri Kivshar, Mario G. Silveirinha, Nader Engheta, Arno Rauschenbeutel, Philipp Schneeweiss, Juergen Volz, Daniel Leykam, Daria A. Smirnova, Kexiu Rong, Bo Wang, Erez Hasman, Michela F. Picardi, Anatoly Zayats, Francisco J. Rodriguez-Fortuno, Chenwen Yang, Jie Ren, Alexander B. Khanikaev, Andrea Alu, Etienne Brasselet, Michael Shats, Jo Verbeeck, Peter Schattschneider, Dusan Sarenac, David G. Cory, Dmitry A. Pushin, Michael Birk, Alexey Gorlach, Ido Kaminer, Filippo Cardano, Lorenzo Marrucci, Mario Krenn, Florian Marquardt
Summary: Structured waves are found in all areas of wave physics, both classical and quantum, where the wavefields are inhomogeneous and cannot be approximated by a single plane wave. These complex wavefields with inhomogeneities are crucial in various fields such as nanooptics, photonics, quantum matter waves, acoustics, water waves, etc. This Roadmap surveys the role of structured waves in wave physics, providing background, current research, and anticipating future developments.
Article
Physics, Applied
Antonio Alex-Amor, Carlos Molero, Mario G. Silveirinha
Summary: This paper presents an analytical framework to study scattering and diffraction phenomena in space-time-modulated metallic gratings. By using a Lorentz transformation, it is shown that a specific class of space-time-modulated gratings acts as moving media. The authors take advantage of this property to derive a closed analytical solution for the wave scattering problem, which allows the avoidance of space-time Floquet-Bloch expansions.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Joao C. Serra, Mario G. Silveirinha
Summary: We introduce a homogenization approach to characterize the dynamical response of a generic dispersive space-time crystal in the long-wavelength limit. The theory is applied to dispersive space-time platforms with a traveling-wave modulation, and it is shown that for long wavelengths the effective response may be described by a frequency-dependent permittivity. The article discusses the peculiar physics exhibited by dispersive space-time crystals, such as anomalous permittivity dispersion, alternate gain and loss regimes, and multiple resonances in the quasistatic regime.
Article
Materials Science, Multidisciplinary
Joao C. Serra, Mario G. Silveirinha
Summary: Topological photonics is a general framework for designing unidirectional edge waveguides and other platforms with extreme nonreciprocal wave phenomena. This study focuses on the topological classification of photonic crystals formed by inclusions subjected to spacetime rotating-wave modulation. The results show that these crystals have a bianisotropic response that breaks time-reversal symmetry and can lead to nontrivial topologies. A proposal for implementing the Haldane model in a spacetime modulated photonic crystal is also presented.
Review
Optics
Emanuele Galiffi, Romain Tirole, Shixiong Yin, Huanan Li, Stefano Vezzoli, Paloma A. Huidobro, Mario G. Silveirinha, Riccardo Sapienza, Andrea Alu, J. B. Pendry
Summary: This review comprehensively discusses the recent progress of time modulation in photonic metamaterials, including temporal switching, photonic time-crystals, and spatiotemporal modulation. It also reviews and provides perspectives on the applications of time modulation in nonreciprocity, synthetic motion, giant anisotropy, etc.
ADVANCED PHOTONICS
(2022)
