Fundamental Radiative Processes in Near-Zero-Index Media of Various Dimensionalities

Lobet, Michaël; Liberal, Iñigo; Knall, Erik; Alam, M. Zahirul; Reshef, Orad; Boyd, Robert W.; Engheta, Nader; Mazur, Eric

doi:10.1021/acsphotonics.0c00782

Cited by 39 publications

(37 citation statements)

References 38 publications

(118 reference statements)

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“…The better approach would be making use of the tunability of ENZ wavelength in the accumulation and depletion layers. The electric field would accumulate and intensify inside the ENZ layer and result in significant phase and intensity modulation 34,35 . However, these tunable metasurfaces suffer from low efficiency due to the inherent high loss of accumulation layer 22,41 , as shown in Fig.…”

Section: Methods and Resultsmentioning

confidence: 99%

Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances

Nemati¹,

Wang²,

Ang³

et al. 2021

OEA

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The lossy nature of indium tin oxide (ITO) at epsilon-near-zero (ENZ) wavelength is used to design an electrically tunable metasurface absorber. The metasurface unit cell is constructed of a circular resonator comprising two ITO discs and a high dielectric constant perovskite barium strontium titanate (BST) film. The ENZ wavelength in the accumulation and depletion layers of ITO discs is controlled by applying a single bias voltage. The coupling of magnetic dipole resonance with the ENZ wavelength inside the accumulation layer of ITO film causes total absorption of reflected light. The reflection amplitude can achieve ~84 dB or ~99.99% modulation depth in the operation wavelength of 820 nm at a bias voltage of −2.5 V. Moreover, the metasurface is insensitive to the polarization of the incident light due to the circular design of resonators and the symmetrical design of bias connections.

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Section: Methods and Resultsmentioning

confidence: 99%

Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances

Nemati¹,

Wang²,

Ang³

et al. 2021

OEA

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“…Such a monopole mode could show ENZ behavior. The advantages of this ENZ metamaterial over DCZIM includes: first, the huge impedance mismatch between the ENZ metamaterial and the ambient media confines most of the light within the metamaterial; second, the large impedance of ENZ metamaterial corresponds to a slow-light effect, leading to an enhancement in the spontaneous emission 111,112 . Furthermore, this purely dielectric ENZ metamaterial is also advantageous over metallic ENZ systems such as plasmonic channels 113 and ENZ nanoscale waveguides 114 due to its low propagation losses and arbitrary shapes over the plane of the pattern.…”

Section: Quantum Opticsmentioning

confidence: 99%

Dirac-like cone-based electromagnetic zero-index metamaterials

Chan

Mazur

2021

Light Sci Appl

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Metamaterials with a Dirac-like cone dispersion at the center of the Brillouin zone behave like an isotropic and impedance-matched zero refractive index material at the Dirac-point frequency. Such metamaterials can be realized in the form of either bulk metamaterials with efficient coupling to free-space light or on-chip metamaterials that are efficiently coupled to integrated photonic circuits. These materials enable the interactions of a spatially uniform electromagnetic mode with matter over a large area in arbitrary shapes. This unique optical property paves the way for many applications, including arbitrarily shaped high-transmission waveguides, nonlinear enhancement, and phase mismatch-free nonlinear signal generation, and collective emission of many emitters. This review summarizes the Dirac-like cone-based zero-index metamaterials’ fundamental physics, design, experimental realizations, and potential applications.

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“…The field enhancement, deep subwavelength confinement and slow light characteristics of these modes have attracted significant attention over the past decade [8,9]. In contrast to bulk ENZ materials, ENZ thin films are not characterized by a vanishing LDOS and have the potential to both modify and improve the emission of nearby emitters [6,10]. These peculiar properties of ENZ films have brought about new possibilities for control of light emission and nonlinear phenomena [11][12][13][14][15].…”

mentioning

confidence: 99%

Hybrid Epsilon-Near-Zero Modes of Photonic Gap Antennas

Patri,

Cognée,

Myers

et al. 2021

Preprint

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We demonstrate that in photonic gap antennas composed of an epsilon-near-zero (ENZ) layer embedded within a high-index dielectric, hybrid modes emerge from the strong coupling between the ENZ thin film and the photonic modes of the dielectric antenna. These hybrid modes show giant electric field enhancements, large enhancements of the far-field spontaneous emission rate and a unidirectional radiation response. We analyze both parent and hybrid modes using quasinormal mode theory and find that the hybridization can be well understood using a coupled oscillator model. Under plane wave illumination, hybrid ENZ antennas can concentrate light with an electric field amplitude ∼100 times higher than that of the incident wave, which places them on par with the best plasmonic antennas. In addition, the far-field spontaneous emission rate of a dipole embedded at the antenna hotspot reaches up to ∼2300 that in free space, with nearly perfect unidirectional emission.

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Fundamental Radiative Processes in Near-Zero-Index Media of Various Dimensionalities

Cited by 39 publications

References 38 publications

Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances

Ultra-high extinction-ratio light modulation by electrically tunable metasurface using dual epsilon-near-zero resonances

Dirac-like cone-based electromagnetic zero-index metamaterials

Hybrid Epsilon-Near-Zero Modes of Photonic Gap Antennas

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