Beam Steering with Dielectric Metalattices

Liu, Wei; Miroshnichenko, Andrey E.

doi:10.1021/acsphotonics.7b01217

Cited by 81 publications

(75 citation statements)

References 72 publications

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“…6(a), where a metalattice of Si nanodisks can fully reflect the incident wave with resonant ED or MD modes within each unit cell. Similar effect can be achieved with the higher-order multipoles [24,118], where quadrupole and/or octupole resonances (or their combinations with ED and MD modes) can also result in full wave reflection. Perfect reflection can be further categorized based on the phase (relative to the incident wave) of the reflected waves, which are highly related to the recent studies of electric and magnetic mirrors [24, 125,126].…”

Section: Perfect Reflectionmentioning

confidence: 66%

“…This is induced by the specific scattering patterns of the lattice cylinders [upper row in (d, e)], which originate from interferences of multipoles of different orders [lower row in (d, e); it agrees with the upper row that the dipolar approximation (dashed curves) is not sufficient here and higher-order multipoles should be taken into consideration]. Adapted from[118,134].…”

mentioning

confidence: 89%

“…Basically, a lattice made of high-index dielectric cylinders can significantly bend the incident waves [of both in-plane and out-of-plane polarizations; see inset in Fig. 7(c)] by a large angle with high efficiencies [118]. Figures 7(d) and 7(e) show the corresponding angular scattering patterns for the lattice cylinder (see the upper row), revealing clearly also what multipoles are excited [see the lower row in Figs.…”

Section: Higher-order Diffraction Controlmentioning

confidence: 99%

“…Reflection is fully suppressed by interference of ED and MD resonances in (f), and of ED and EQ resonances in (g). Adapted from[106,113,[118][119][120].…”

mentioning

confidence: 99%

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Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles

et al. 2017

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The original Kerker effect was introduced for a hypothetical magnetic sphere, and initially it did not attract much attention due to a lack of magnetic materials required. Rejuvenated by the recent explosive development of the field of metamaterials and especially its core concept of optically-induced artificial magnetism, the Kerker effect has gained an unprecedented impetus and rapidly pervaded different branches of nanophotonics. At the same time, the concept behind the effect itself has also been significantly expanded and generalized. Here we review the physics and various manifestations of the generalized Kerker effects, including the progress in the emerging field of meta-optics that focuses on interferences of electromagnetic multipoles of different orders and origins. We discuss not only the scattering by individual particles and particle clusters, but also the manipulation of reflection, transmission, diffraction, and absorption for metalattices and metasurfaces, revealing how various optical phenomena observed recently are all ubiquitously related to the Kerker's concept.

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Section: Perfect Reflectionmentioning

confidence: 66%

mentioning

confidence: 89%

Section: Higher-order Diffraction Controlmentioning

confidence: 99%

“…Reflection is fully suppressed by interference of ED and MD resonances in (f), and of ED and EQ resonances in (g). Adapted from[106,113,[118][119][120].…”

mentioning

confidence: 99%

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Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles

et al. 2017

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“…After having thoroughly surveyed the hidden landscapes of electromagnetic multipoles of complex vectorial natures, now we aim to show how their topological properties could be wielded to bring new frames of visions. It is previously shown that periodic photonic structures could be treated in a reductionist manner: the far-field properties of the radiative Bloch modes are decided only by the multipolar radiations of unit-cells along the corresponding directions of open out-coupling channels [15,46,47]. For example, the coincidence of V-points of unit-cell radiations with the open channels would immediately produce BICs, as there is no effective energy leakage [15,16].…”

Section: (A)mentioning

confidence: 99%

Singularities and Poincaré Indices of Electromagnetic Multipoles

2019

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Electromagnetic multipoles can be continuously mapped to tangent vectors on the momentum sphere, the topology of which guarantees the existence of isolated singularities. For pure (real or imaginary) vectors, those singularities correspond to zeros of tangent fields, which can be classified by integer Poincaré indices. Nevertheless, electromagnetic fields are generally complex vectors, a comprehensive characterization of which requires the introduction of line fields and line singularities categorized by half-integer Hopf indices. Here we explore complex vectorial electromagnetic multipoles from the perspective of line singularities, focusing on the special case of polarization line field. Similar to the case of pure vectors, the Poincaré-Hopf theorem forces the index sum of all line singularities to be 2, irrespective of the specific multipolar compositions. With this multipolar insight, we further unveil the underlying structures of radiative circularly-polarized Bloch modes of photonic crystal slabs, revealing their topological origins with line singularities of Hopf indices. Our work has established subtle connections between three seemingly unrelated but sweeping physical entities (line singularities of Hopf indices, electromagnetic multipoles, and Bloch modes), which can nourish new frames of visions and applications fertilizing many related fields.

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All‐Dielectric Metalattice with Enhanced Toroidal Dipole Response

Sayanskiy

Danaeifar

Kapitanova

et al. 2018

Advanced Optical Materials

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which exhibit resonant toroidal dipole response. [10][11][12][13][14][15][16] Many successful designs were demonstrated in microwave frequency range, when the material losses are negligible. However, most of proposed designs are sensitive to the incident polarization and the toroidal dipole response has been observed in narrow frequency range. [11,16] In visible range the observation of toroidal dipole response is becoming quite challenging due to increasing dissipative losses of plasmonic materials.In this paper, we suggest a novel type of all-dielectric metalattice which supports dominant toroidal dipole response over a wide frequency range in the visible. The unit cell of the proposed metalattice consists of four rectangular bars with large aspect ratio as shown in Figure 1a. As soon as the size of one unit-cell is comparable to the wavelength of light in free space, we involve the term of metalattice which is not limited to subdiffraction regime and has been recently proposed in ref. [17]. In contrast to widely used high-index materials, such as, c-Si, Ge, and GaAs, we propose to use moderate index materials with the permittivity of about 10, such as, InP or GaP. [18] By performing the Cartesian multipole decomposition of the induced polarization currents inside the unit cell of the metalattice we demonstrate that such moderate index contrast structures exhibit strong toroidal dipole response, which is the dominant contribution over a wide spectrum range. We also found a correlation between the toroidal dipole response and longitudinal component of the electric near-field. To proof the concept we performed direct experimental characterization of far-and near-field properties of the designed metalattice in microwave frequency range, where the near-field mapping can be easily achieved.The optical response of a single dielectric bar with large aspect ratio has been previously discussed. [19] Due to the geometrical asymmetry of the single bar with large aspect ratio in x-y plane, the optical response of the metasurface made of periodically arranged bars depended on the incident wave polarization. [19] In fact, the polarization independent response is highly desirable for various applications.Motivated by these results, we explore an alternative material and structure, which should exhibit polarization independent response due to the C 4 rotational symmetry of its unit cell. It turns out that moderate index materials with refractive index around n ≈3 exhibit low dissipative losses. Particularly, in visible spectral range of 0.50-0.80 µm the refractive index A novel type of all-dielectric metalattice is proposed and experimentally demonstrated, which supports broadband dominant toroidal dipole response. The unit cell consists of four rectangular bars made of dielectric materials of moderate contrast. By performing multipole decomposition it is found that toroidal dipole response is dominant over a wide frequency range. The correlation between the toroidal dipole response and longitudinal electric field component is...

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Beam Steering with Dielectric Metalattices

Cited by 81 publications

References 72 publications

Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles

Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles

Singularities and Poincaré Indices of Electromagnetic Multipoles

All‐Dielectric Metalattice with Enhanced Toroidal Dipole Response

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