New Horizons in Near-Zero Refractive Index Photonics and Hyperbolic Metamaterials

Lobet, Michaël; Kinsey, Nathaniel; Liberal, Iñigo; Caglayan, Humeyra; Huidobro, Paloma A.; Galiffi, Emanuele; Mejía-Salazar, Jorge Ricardo; Palermo, Giovanna; Jacob, Zubin; Maccaferri, Nicolò

doi:10.1021/acsphotonics.3c00747

Cited by 10 publications

(4 citation statements)

References 210 publications

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“…Let us first discuss the permittivity values for the InSb material at f = 300 GHz and T K = 200 K, summarized in table 1. For B = 0 T we have an isotropic (ε ∥ = ε ⊥ and ε off = 0) metallic behavior, whilst for B = ±3 T the InSb material behaves as a hyperbolic metamaterial (HMM) [55], i.e. ε ⊥ ε ∥ < 0.…”

Section: Resultsmentioning

confidence: 99%

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Carvalho,

Moncada-Villa,

Mejía-Salazar

et al. 2024

J. Phys. D: Appl. Phys.

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In this work, we introduce a concept to enable dynamic beamforming of terahertz (THz) wavefronts using applied magnetic fields (B). The proposed system exploits the magnetically switchable hyperbolic dispersion of the InSb semiconductor. This phenomenology, combined with diffractive surfaces and magnetic tilting of scattered fields, allows the design of a metasurface that works with either circularly or linearly polarized wavefronts. In particular, we demonstrate numerically that the transmitted beam tilting can be manipulated with the direction and magnitude of B. Numerical results, obtained through the finite element method (FEM), are qualitatively supported by semi-analytical results from the generalized dipole theory. Motivated by potential applications in future Tera-WiFi active links, a metasurface is simulated for the working frequency f = 300 GHz. The results indicate that the transmitted field can be actively tuned to point in five different directions with beamforming of ±45°, depending on the magnitude and direction of B. In addition to magnetic beamforming, we also demonstrate that our proposal exhibits magnetic circular dichroism (MCD), which can also find applications in magnetically tunable THz isolators for one-way transmission/reflection.

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Section: Resultsmentioning

confidence: 99%

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Carvalho,

Moncada-Villa,

Mejía-Salazar

et al. 2024

J. Phys. D: Appl. Phys.

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“… 144 , 145 Thus far, practical implementations have mostly relied on metamaterials, 146 − 176 metasurfaces, 177 − 189 photonic crystals, 190 − 204 or subwavelength structures, 205 such as spatial gratings, 206 − 214 cavities, 215 − 220 or, in general, resonant optical systems 221 − 228 ( Figure 2 b). Among the many realizations carried out in these platforms, for their exceptional properties, there are two examples which have attracted a great deal of attention: 229 hyperbolic metamaterials 160 − 170 and Epsilon-Near-Zero (ENZ) materials. 171 − 176 …”

Section: Emission Of Thermal Radiation From Three Different Approachesmentioning

confidence: 99%

Review on the Scientific and Technological Breakthroughs in Thermal Emission Engineering

Vázquez-Lozano,

Liberal

2024

ACS Appl. Opt. Mater.

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The emission of thermal radiation is a physical process of fundamental and technological interest. From different approaches, thermal radiation can be regarded as one of the basic mechanisms of heat transfer, as a fundamental quantum phenomenon of photon production, or as the propagation of electromagnetic waves. However, unlike light emanating from conventional photonic sources, such as lasers or antennas, thermal radiation is characterized for being broadband, omnidirectional, and unpolarized. Due to these features, ultimately tied to its inherently incoherent nature, taming thermal radiation constitutes a challenging issue. Latest advances in the field of nanophotonics have led to a whole set of artificial platforms, ranging from spatially structured materials and, much more recently, to time-modulated media, offering promising avenues for enhancing the control and manipulation of electromagnetic waves, from far-to near-field regimes. Given the ongoing parallelism between the fields of nanophotonics and thermal emission, these recent developments have been harnessed to deal with radiative thermal processes, thereby forming the current basis of thermal emission engineering. In this review, we survey some of the main breakthroughs carried out in this burgeoning research field, from fundamental aspects to theoretical limits, the emergence of effects and phenomena, practical applications, challenges, and future prospects.

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“…Multilayered metal−insulator structures represent an interesting platform for engineering both the spatial and temporal properties of the electric permittivity in photonic devices. 1 These structures offer the possibility to bring the refractive index close to zero, 2−4 enabling novel optical phenomena such as perfect transmission through distorted waveguides, 5 cloaking 6,7 and inhibited diffraction. 8 They also present an almost infinite density of states 9 and are widely used for nanoscale light confinement and guiding, 10−14 as well as manipulating scattering, absorption and nonreciprocal propagation of light, 15−22 generating optical vortex beams 23 and tailoring optical nonlinearities, 24−30 as well as for highly sensitive detection 31−35 and ultrafast all-optical switching.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Multilayered metal–insulator structures represent an interesting platform for engineering both the spatial and temporal properties of the electric permittivity in photonic devices . These structures offer the possibility to bring the refractive index close to zero, − enabling novel optical phenomena such as perfect transmission through distorted waveguides, cloaking , and inhibited diffraction .…”

Section: Introductionmentioning

confidence: 99%

Probing Temperature Changes Using Nonradiative Processes in Hyperbolic Meta-Antennas

Henriksson,

Gabbani,

Petrucci

et al. 2024

ACS Appl. Opt. Mater.

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Multilayered metal-dielectric nanostructures display both a strong plasmonic behavior and hyperbolic optical dispersion. The latter is responsible for the appearance of two separated radiative and nonradiative channels in the extinction spectrum of these structures. This unique property can open plenty of opportunities toward the development of multifunctional systems that simultaneously can behave as optimal scatterers and absorbers at different wavelengths, an important feature to achieve multiscale control of light–matter interactions in different spectral regions for different types of applications, such as optical computing or detection of thermal radiation. Nevertheless, the temperature dependence of the optical properties of these multilayered systems has never been investigated. In this work, we study how radiative and nonradiative processes in hyperbolic meta-antennas can probe temperature changes of the surrounding medium. We show that, while radiative processes are essentially not affected by a change in the external temperature, the nonradiative ones are strongly affected by a temperature variation. By combining experiments and temperature-dependent effective medium theory, we find that this behavior is connected to enhanced damping effects due to electron–phonon scattering. Contrary to standard plasmonic systems, a red-shift of the nonradiative mode occurs for small variations of the environment temperature. Our study shows that, to probe temperature changes, it is essential to exploit nonradiative processes in systems supporting plasmonic excitations, which can be used as very sensitive thermometers via linear absorption spectroscopy.

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New Horizons in Near-Zero Refractive Index Photonics and Hyperbolic Metamaterials

Cited by 10 publications

References 210 publications

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Dynamic terahertz beamforming based on magnetically switchable hyperbolic materials

Review on the Scientific and Technological Breakthroughs in Thermal Emission Engineering

Probing Temperature Changes Using Nonradiative Processes in Hyperbolic Meta-Antennas

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