Local Field Topology behind Light Localization and Metamaterial Topological Transitions

Tong, Jonathan; Mercedes, Alvin; Chen, Gang; Boriskina, Svetlana V.

doi:10.1201/b17632-9

Cited by 9 publications

(6 citation statements)

References 76 publications

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“…There may also be a deeper link between the polarization singularities in metaphotonic structures and spontaneous halfvortices in exciton-polaritons [163][164][165] . Other optical singularities also require further research in metaphotonics in both near field and far field, such as caustics 166 , optical vortices being singularities of phase 125,127,159, , vortices of optical currents [189][190][191][192][193][194][195][196][197][198][199] , and Riemann-Silberstein vortices being singularities in the electromagnetic field independent of the gauge transformation 200 . We believe these future efforts will broaden significantly the horizons of nanophotonics and offer new perspectives for metaphotonics applications.…”

Section: Discussionmentioning

confidence: 99%

Topological Polarization Singularities in Metaphotonics

Liu,

Shi

et al. 2020

Preprint

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Polarization singularities of vectorial electromagnetic fields locate at the positions (such as points, lines, or surfaces) where properties of polarization ellipses are not defined. They are manifested as circular and linear polarizations, for which respectively the semi-major axes and normal vectors of polarization ellipses become indefinite. First observed in conical diffraction in 1830's, the field of polarization singularities has been systematically reshaped and deepened by many pioneers of wave optics. Together with other exotic phenomena such as non-Hermiticity and topology, polarization singularities have been introduced into the vibrant field of nanophotonics, rendering unprecedented flexibilities for manipulations of light-matter interactions at the nanoscale. Here we review the recent results on the generation and observation of polarization singularities in metaphotonics. We start with the discussion of polarization singularities in the Mie theory, where both electric and magnetic multipoles are explored from perspectives of local and global polarization properties. We then proceed with the discussion of various photonic-crystal structures, for which both near-and far-field patterns manifest diverse polarization singularities characterized by the integer Poincaré or more general half-integer Hopf indices (topological charges). Next, we review the most recent studies of conversions from polarization to phase singularities in scalar wave optics, demonstrating how bound states in the continuum can be exploited to generate directly optical vortices of various charges. Throughout our paper, we discuss and highlight several fundamental concepts and demonstrate their close connections and special links to metaphotonics. We believe polarization singularities can provide novel perspectives for light-matter manipulation for both fundamental studies and their practical applications.

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Section: Discussionmentioning

confidence: 99%

Topological Polarization Singularities in Metaphotonics

Liu,

Shi

et al. 2020

Preprint

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“…3b 61,63 . The high longitudinal momentum associated with surface polariton modes is a manifestation of the angular momentum of photons involved in the circulating powerflow along the material interface [85][86][87] . Although the highlongitudinal-momentum photon states only exist in the sub-wavelength region near the interface, they can be utilized to enhance thermal emission provided that the emitter and the extractor (or the absorber) are coupled through the near field 12,63,72,83,[88][89][90][91][92][93][94][95][96] .…”

Section: The Role Of Electron and Photon Densities Of States And The ...mentioning

confidence: 99%

Heat meets light on the nanoscale

et al. 2016

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Abstract:We discuss the state-of-the-art and remaining challenges in the fundamental understanding and technology development for controlling light-matter interactions in nanophotonic environments in and away from thermal equilibrium. The topics covered range from the basics of the thermodynamics of light emission and absorption to applications in solar thermal energy generation, thermophotovoltaics, optical refrigeration, personalized cooling technologies, development of coherent incandescent light sources, and spinoptics.Keywords: thermal emission; absorption; spectral selectivity; angular selectivity; optical refrigeration; solar thermal energy conversion; thermophotovoltaics; nearfield heat transfer; photon density of states; thermal upconversion; radiative cooling Thermodynamics of light and heatControl and optimization of energy conversion processes involving photon absorption and radiation require detailed understanding of thermodynamic properties of radiation as well as its interaction with matter [1-5]. Historically, thermodynamic treatment of electromagnetic radiation began over a century ago with Planck applying the thermodynamic principles established for a gas of material particles to an analogous "photon gas" [1]. In particular, he showed that thermodynamic parameters, such as the energy, volume, temperature, and pressure can be applied to electromagnetic radiation, reflecting the dual wave-particle nature of photons. In this section, we will review the general thermodynamic principles governing photon propagation and interaction with matter, as well

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“…As already noted, two types of surface waves can contribute to the total heat flux: totally internally reflected waves with . In particular, if both surfaces can support polariton waves, the waves excited on each surface resonantly couple forming bonding and anti-bonding supermodes [28,60,61], which strongly modifies resonant photon coupling across the vacuum gap. To better understand the physical mechanisms that distinguish SPP modes from SPhP modes, we begin by comparing the dielectric functions of metals and polar dielectrics.…”

Section: Near-field Radiative Heat Transfer Mediated By the Coupling ...mentioning

confidence: 99%

Enhancement and Tunability of Near-Field Radiative Heat Transfer Mediated by Surface Plasmon Polaritons in Thin Plasmonic Films

et al. 2015

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The properties of thermal radiation exchange between hot and cold objects can be strongly modified if they interact in the near field where electromagnetic coupling occurs across gaps narrower than the dominant wavelength of thermal radiation. Using a rigorous fluctuational electrodynamics approach, we predict that ultra-thin films of plasmonic materials can be used to dramatically enhance near-field heat transfer. The total spectrally integrated film-to-film heat transfer is over an order of magnitude larger than between the same materials in bulk form and also exceeds the levels achievable with polar dielectrics such as SiC. We attribute this enhancement to the significant spectral broadening of radiative heat transfer due to coupling between surface plasmon polaritons (SPPs) on both sides of each thin film. We show that the radiative heat flux spectrum can be further shaped by the choice of the substrate onto which the thin film is deposited. In particular, substrates supporting surface phonon polaritons (SPhP) strongly modify the heat flux spectrum owing to the interactions between SPPs on thin films and SPhPs of the substrate. The use of thin film phase change materials on polar dielectric substrates allows for dynamic switching of the heat flux spectrum between SPP-mediated and SPhP-mediated peaks.

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Local Field Topology behind Light Localization and Metamaterial Topological Transitions

Cited by 9 publications

References 76 publications

Topological Polarization Singularities in Metaphotonics

Topological Polarization Singularities in Metaphotonics

Heat meets light on the nanoscale

Enhancement and Tunability of Near-Field Radiative Heat Transfer Mediated by Surface Plasmon Polaritons in Thin Plasmonic Films

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