A5039042128- Quantum Information and Cryptography
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Laser-Matter Interactions and Applications
- Mechanical and Optical Resonators
- Strong Light-Matter Interactions
- Advanced Fiber Laser Technologies
- Advanced Electron Microscopy Techniques and Applications
- Quantum optics and atomic interactions
- Thermal Radiation and Cooling Technologies
- Orbital Angular Momentum in Optics
- Quantum and electron transport phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Optical Network Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Photocathodes and Microchannel Plates
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Quantum Electrodynamics and Casimir Effect
- Metamaterials and Metasurfaces Applications
- Terahertz technology and applications
- Advanced X-ray Imaging Techniques
Massachusetts Institute of Technology
2015-2024
Harvard University
2018-2024
Harvard University Press
2023-2024
Cornell University
2024
IIT@MIT
2016-2023
Stockton University
2023
Columbia University
2005-2015
Making the forbidden allowed Spontaneous emission, in which an excited electron lowers its energy by emitting a photon, is fundamental process light-matter interactions. In principle, can relax from state to any unoccupied lower level. practice, however, most of these transitions are too slow and so effectively forbidden. Rivera et al. show theoretically that plasmonic excitations associated with two-dimensional materials be used enhance control interaction. Transitions were once considered...
Abstract In this article, we review strong light-matter coupling at the interface of materials science, quantum chemistry, and photonics. The control light heat thermodynamic limits enables exciting new opportunities for rapidly converging fields polaritonic chemistry optics atomic scale from a theoretical computational perspective. Our follows remarkable experimental demonstrations that now routinely achieve limit matter. many molecules couple collectively to single-photon mode, whereas, in...
A fundamental building block for nanophotonics is the ability to achieve negative refraction of polaritons, because this could enable demonstration many unique nanoscale applications such as deep-subwavelength imaging, superlens, and novel guiding. However, highly squeezed plasmon polaritons in graphene phonon boron nitride (BN) with their wavelengths by a factor over 100, requires flip sign group velocity at will, which challenging. Here we reveal that strong coupling between graphene-BN...
Abstract Plasmon–emitter interactions are of central importance in modern nanoplasmonics and generally maximal at short emitter–surface separations. However, when the separation falls below 10–20 nm, classical theory deteriorates progressively due to its neglect quantum effects such as nonlocality, electronic spill-out, Landau damping. Here we show how this can be remedied a unified theoretical treatment mesoscopic electrodynamics incorporating Feibelman $$d$$ <mml:math...
Bombardment of materials by high-energy particles often leads to light emission in a process known as scintillation. Scintillation has widespread applications medical imaging, x-ray nondestructive inspection, electron microscopy, and particle detectors. Most research focuses on finding with brighter, faster, more controlled We developed unified theory nanophotonic scintillators that accounts for the key aspects scintillation: energy loss particles, non-equilibrium electrons nanostructured...
When impinging on optical structures or passing in their vicinity, free electrons can spontaneously emit electromagnetic radiation, a phenomenon generally known as cathodoluminescence. Free-electron radiation comes many guises: Cherenkov, transition, and Smith–Purcell but also electron scintillation, commonly referred to incoherent While those effects have been at the heart of fundamental discoveries technological developments high-energy physics past century, recent demonstration photonic...
Phonon polaritons in van der Waals materials reveal significant confinement accompanied with long propagation length: important virtues for tasks pertaining to the control of light and energy flow at nanoscale. While previous studies phonon have relied on relatively thick samples, here reported is first observation surface single atomic layers bilayers hexagonal boron nitride (hBN). Using antenna-based near-field microscopy, propagating mono- bilayer hBN microcrystals are imaged. monolayer...
The interactions of free electrons with optical cavities enable the creation novel quantum photonic states.
Investigating light emission by free charged particles through the prism of quantum optics can unveil emitter wave function.
Free electrons provide a powerful tool to probe material properties at atomic-scale spatial resolution. Recent advances in ultrafast electron microscopy enable the manipulation of free wavefunctions using laser pulses. It would be great importance if one could combine resolution probes with ability pulses coherent phenomena quantum systems. To this end, we propose novel technique that leverages are coherently-shaped by measure coherence materials. Developing theory electron-qubit...
A new approach to generating quantum states of light most suitable for robust computing draws on one the basic interactions in physics---the interaction between free electrons and photons.
Cavity QED, wherein a quantum emitter is coupled to electromagnetic cavity modes, powerful platform for implementing sensors, memories, and networks. However, due the fundamental trade-off between gate fidelity execution time, as well limited scalability, use of QED computation was overtaken by other architectures. Here, we introduce new element into QED—a free charged particle, acting flying qubit. Using electrons specific example, demonstrate that our approach enables ultrafast,...
A central challenge in the emerging field of free-electron quantum optics is to achieve strong interaction and single-photon nonlinearity between a flying free electron photonic mode. Existing schemes are intrinsically limited by diffraction, which puts an upper bound on length and, therefore, strength coupling nonlinearity. Here, we propose "free-electron fibers": effectively one-dimensional systems where electrons copropagate with two guided modes. The first mode applies ponderomotive trap...
The ability to achieve ultrastrong coupling between light and matter promises bring about new means control material properties, concepts for manipulating at the atomic scale, insights into quantum electrodynamics (QED). Thus, there is a need develop quantitative theories of QED phenomena in complex electronic photonic systems. In this Letter, we variational theory general non-relativistic systems coupled matter. Essential our Ansatz notion an effective vacuum whose modes are different than...
Extreme confinement of electromagnetic energy by phonon polaritons holds the promise strong and new forms control over dynamics matter. To bring such to atomic-scale limit, it is important consider in two-dimensional (2D) systems. Recent studies have pointed out that 2D, splitting between longitudinal transverse optical (LO TO) phonons absent at Γ point, even for polar materials. Does this lack LO-TO imply absence a polariton monolayers? answer this, we connect microscopic properties with...
The quantization of the electromagnetic field leads directly to existence quantum mechanical states, called Fock with an exact integer number photons. Despite these fundamental states being long-understood, and despite their many potential applications, generating them is largely open problem. For example, at optical frequencies, it challenging deterministically generate order two beyond. Here, we predict effect in nonlinear optics, which enables deterministic generation large arbitrary...
Strong coupling in light-matter systems is a central concept cavity quantum electrodynamics and essential for many technologies. Especially the optical range, full control of highly connected multi-qubit necessitates coherent probes with nanometric spatial resolution, which are currently inaccessible. Here, we propose use free electrons as high-resolution sensors strongly coupled systems. Shaping free-electron wave packet enables measurement state entire hybrid We specifically show how...
Time-varying optical materials have attracted recent interest for their potential to enable frequency conversion, nonreciprocal physics, photonic time-crystals, and more. However, the description of time-varying has been largely limited regimes where material resonances (i.e., dispersion) can be neglected. In this work, we describe how optics these dispersive emerge from microscopic quantum mechanical models time-driven systems. Our results are based on a framework describing through linear...
Significance The recent discovery of nanoscale-confined phonon polaritons in polar dielectric materials has generated vigorous interest because it provides a path to low-loss nanoscale photonics at technologically important mid-IR and terahertz frequencies. In this work, we show that these dielectrics can be used develop bright efficient spontaneous emitter photon pairs. two-photon emission completely dominate the total for realistic electronic systems, even when competing single-photon...
Metasurfaces are subwavelength spatial variations in geometry and material where the structures of negligible thickness compared to wavelength light optimized for far-field applications, such as controlling wavefronts electromagnetic waves. Here, we investigate potential metasurface near-field profile, generated by an incident few-cycle pulse laser, facilitate generation high-frequency from free electrons. In particular, contains higher-order harmonics that can be leveraged generate multiple...
When multiple quantum emitters radiate, their emission rate may be enhanced or suppressed due to collective interference in a process known as super- subradiance. Such processes are well-known occur also light by free charged particles. To date, all experimental and theoretical studies of subradiance these systems involved the classical correlations between emitters. However, dependence on correlations, such entanglement different emitting particles, has not been studied. Recent advances...
Time-varying optical media, whose dielectric properties are actively modulated in time, introduce a host of novel effects the classical propagation light, and intense current interest. In quantum domain, time-dependent media can be used to convert vacuum fluctuations (virtual photons) into pairs real photons. We refer these processes broadly as ``dynamical effects'' (DVEs). Despite interest for their potential applications sources DVEs generally very weak, presenting many opportunities...