Terahertz Magnetic Mirror Realized with Dielectric Resonator Antennas

Headland, Daniel; Nirantar, Shruti; Withayachumnankul, Withawat; Gutruf, Philipp; Abbott, Derek; Bhaskaran, Madhu; Fumeaux, Christophe; Sriram, Sharath

doi:10.1002/adma.201503069

Cited by 67 publications

(35 citation statements)

References 55 publications

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“…174 Subsequently, uniform arrays of resonators employing high-resistivity silicon, which has a relative permittivity 175 of ∼ 11.68 in the terahertz range, were demonstrated. 176,177 The more-moderate relative permittivity of the dielectric employed in the latter two cases is better suited to terahertz reflectarray applications, as it engenders a lower Q r that is more amenable to precise phase control. Additionally, dielectric resonators of this sort have numerous higher-order modes of resonance, which jointly produce a large phase transition.…”

Section: Dielectric Resonatorsmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

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Section: Dielectric Resonatorsmentioning

confidence: 99%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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“…Resonant response usually accompanies a large reflection, which makes it more feasible for dielectric metasurfaces to operate in a reflection configuration [21,93]. This could be beneficial, for instance, enabling the demonstration of broadband dielectric metasurface mirrors [138][139][140] and optical magnetic mirrors [141,142], without reflection phase reversal in the latter. Using geometric shapes other than spherical or cubic dielectric resonators, one would have more degrees of freedom to tune the frequencies of electric and magnetic resonances, realizing resonant directional scattering.…”

Section: Directional Scatteringmentioning

confidence: 99%

A review of metasurfaces: physics and applications

2016

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Abstract. Metamaterials are composed of periodic subwavelength metal/dielectric structures that resonantly couple to the electric and/or magnetic components of the incident electromagnetic fields, exhibiting properties that not found in nature. This class of micro-and nano-structured artificial media have attracted great interest during the past 15 years and yielded ground-breaking electromagnetic and photonic phenomena. However, the high losses and strong dispersion associated with the resonant responses and the use of metallic structures, as well as the difficulty in fabricating the micro-and nanoscale 3D structures, have hindered practical applications of metamaterials. Planar metamaterials with subwavelength thickness, or metasurfaces, consisting of single-layer or few-layer stacks of planar structures can be readily fabricated using lithography and nanoprinting methods, and the ultrathin thickness in the wave propagation direction can greatly suppress the undesirable losses. Metasurfaces enable a spatially varying optical response (e.g., scattering amplitude, phase, and polarization), mold optical wavefronts into shapes that can be designed at will, and facilitate the integration of functional materials to accomplish active control and greatly enhanced nonlinear response. This paper reviews recent progress in the physics of metasurfaces operating at wavelengths ranging from microwave to visible. We provide an overview of key metasurface concepts such as anomalous reflection and refraction, and introduce metasurfaces based on the PancharatnamBerry phase and Huygens' metasurfaces, as well as their use in wavefront shaping and beam forming applications, followed by a discussion of polarization conversion in fewlayer metasurfaces and their related properties. An overview of dielectric metasurfaces reveals their ability to realize unique functionalities coupled with Mie resonances and their low ohmic losses. We also describe metasurfaces for wave guidance and radiation control, as well as active and nonlinear metasurfaces. Finally, we conclude by providing our opinions of future developments in this rapidly developing research field.

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“…Owing to effective light confinement, dielectrics with high permittivity can generate magnetic dipoles, electric dipoles and higher order dipoles due to Mie resonances in the microwave, terahertz, and optical wavelengths [20][21][22][23][24][25][26][27][28][29][30][31]. In addition to the powerful applications of all-dielectric metasurface in manipulating light phase and polarization [32][33][34], high Q resonance and its applications is also an interesting research topic.…”

Section: Introductionmentioning

confidence: 99%

High Q-Factor Resonance in a Symmetric Array of All-Dielectric Bars

Sui

Lang

et al. 2018

Applied Sciences

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Strong electrical dipole resonance (ER) with high quality-factor (Q) (over several thousands) in a simple silicon all-dielectric rod arrays without asymmetric structure is achieved in the near infrared (NIR) wavelength range. According to numerical simulations, strong high order ER is excited by vertical incident plane waves with electric fields polarized perpendicular to the rod instead of parallel. The electric field coupling between adjacent rods is greatly enhanced by increasing the length of the rods, and the radiative loss of the ER is significantly depressed, thus achieving high Q resonances. In the meantime, the electric field enhancement both inside and surrounding the rod are greatly improved, which is conducive to many applications. The proposed all-dielectric metasurface is simple, low loss, Complementary Metal Oxide Semiconductor (CMOS) compatible, and can be applied in many fields, such as sensing, narrowband filters, optical modulations, and nonlinear interactions.

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Terahertz Magnetic Mirror Realized with Dielectric Resonator Antennas

Cited by 67 publications

References 55 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

A review of metasurfaces: physics and applications

High Q-Factor Resonance in a Symmetric Array of All-Dielectric Bars

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