Microwave Approach to Study Resonant Features of All-dielectric Metasurfaces

Kupriianov, Anton S.; Tuz, Vladimir R.

doi:10.1109/piers-fall48861.2019.9021327

Cited by 7 publications

(9 citation statements)

References 21 publications

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“…For our experiments, we use a well-established techthat was described in detail earlier [94]. In particular, we perform our experimental study in the range (8−15 GHz) using Rohde & Schwarz ZVA50 Vector Network Analyzer as the main measurement platform.…”

Section: Ramicmentioning

confidence: 99%

Toroidic and antitoroidic orders in hexagonal arrays of dielectric trimers: magnetic group approach

Dmitriev,

Santos,

Evlyukhin

et al. 2021

Preprint

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Herein, we investigate symmetry-protected toroidal dipole resonances and conditions of their excitation in a new type of electromagnetic metamaterials. These metamaterials are all-dielectric planar periodic arrays of dielectric disks disposed on a dielectric substrate. The elementary building blocks of the array are trimers which are distributed in hexagonal unit supercells. The highest geometrical symmetry of the unit supercell is C6v. The analysis is fulfilled by using the representation theory of groups with application of the magnetic group theory, which is a new approach in solving such problems. We have shown that to get access to the toroidal supermodes of the array, symmetry of the unit supercell must be broken twice: firstly, the C3v symmetry of the trimer, and secondly, the C6v symmetry of the unit supercell needs to be reduced. Selection rules for the symmetric and antisymmetric orders of the toroidal dipole moments in the arrays are defined. In particular, we have shown that with the reduction of the unit supercell symmetry to the C2v group, the array exhibits the toroidal dipole resonance with antitoroidic order. The arrays with the lower Cs symmetry can provide the resonances with both toroidic and antitoroidic orders. It is also shown that these arrays are always polarization sensitive. Full-wave simulations and experiments confirm the theoretical predictions. The suggested metamaterials can provide an enhanced light-matter interaction due to the spatially and temporally confined light in resonant systems with very high quality factors.

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Section: Ramicmentioning

confidence: 99%

Toroidic and antitoroidic orders in hexagonal arrays of dielectric trimers: magnetic group approach

Dmitriev,

Santos,

Evlyukhin

et al. 2021

Preprint

Self Cite

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“…For our calculations, we consider that the disk is made of a lossless highε ceramic material. We use this material in view of our experimental capabilities and techniques [62,63]. Nevertheless, our results can be easily scaled for the disks with others geometrical and material parameters operating in the desired spectral range.…”

Section: Magnetic Dipole Resonance In Isolated Dielectric Diskmentioning

confidence: 99%

“…In this section, the goal is to confirm our theoretical findings and find out the resistance of the toroidal mode to internal losses inherent in real metasurfaces. To this end, we apply a microwave approach [30,62,63] for prototyping and investigation resonant features of all-dielectric metasurfaces under consideration.…”

Section: Toroidal Dipole Mode Manifestation In Real Metasurfacesmentioning

confidence: 99%

“…The measurements are performed with the use of the Vector Network Analyzer (VNA) Rohde & Schwartz ZVA50. All resonances of interest can be readily recognized in the transmission spectra, although they are somewhat suppressed by actual losses existing in the metasurfaces (corresponding spectra are not presented here, partially they can be found in [30,63]).…”

Section: Toroidal Dipole Mode Manifestation In Real Metasurfacesmentioning

confidence: 99%

“…The near-field imaging system is used to perform the movement of the probe along the metasurface plane. The scanning area covers several unit cells (see details on the measurement technique in references [30,62,63]). The results of our measurements of the corresponding near-fields are presented in figure 10.…”

Section: Toroidal Dipole Mode Manifestation In Real Metasurfacesmentioning

confidence: 99%

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Symmetry analysis of trimer-based all-dielectric metasurfaces with toroidal dipole modes

Dmitriev,

Kupriianov,

Santos

et al. 2020

Preprint

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Herein, we discuss the conditions for excitation of symmetryprotected toroidal dipole modes in all-dielectric metasurfaces composed of trimer or twin-trimer clusters of dielectric disks. Such metasurfaces permit enhanced light-matter interaction due to spatially confined light in resonant systems with a high-quality factor. To describe characteristics of toroidal modes existing in the clusters, we use the magnetic dipole moments approximation, group-theoretical methods, group representation theory, symmetry-adapted linear combination method, and circuit theory. To validate the obtained theoretical results, we fulfill both full-wave numerical simulations and microwave experiments. In particular, we have shown that the toroidal dipole mode appears as a quasi-dark state of the trimer. It can be excited in the metasurface by the field of a linearly polarized wave, providing the symmetry of the trimer is properly reduced. In the metasurface, the properties of the toroidal dipole mode are determined primarily by the parameters of a single trimer and are not a consequence of the periodicity of the array. The coupling of the toroidal dipole modes in the twin-trimers can appear in both bonding and anti-bonding fashion resulting in different orders of the net toroidal dipole moment. Due to the unique field configuration of these modes, the proposed metasurfaces can be considered as a platform for efficient light-matter interaction for enhanced absorption, nonlinear switching, and sensing.

show abstract

Symmetry analysis of trimer-based all-dielectric metasurfaces with toroidal dipole modes

Dmitriev

Kupriianov

Santos

et al. 2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Herein, we discuss the conditions for excitation of symmetry-protected toroidal dipole modes in all-dielectric metasurfaces composed of trimer or twin-trimer clusters of dielectric disks. Such metasurfaces permit enhanced light–matter interaction due to spatially confined light in resonant systems with a high-quality factor. To describe characteristics of toroidal modes existing in the clusters, we use the magnetic dipole moments approximation, group-theoretical methods, group representation theory, symmetry-adapted linear combination method, and circuit theory. To validate the obtained theoretical results, we fulfill both full-wave numerical simulations and microwave experiments. In particular, we have shown that the toroidal dipole mode appears as a quasi-dark state of the trimer. It can be excited in the metasurface by the field of a linearly polarized wave, providing the symmetry of the trimer is properly reduced. In the metasurface, the properties of the toroidal dipole mode are determined primarily by the parameters of a single trimer and are not a consequence of the periodicity of the array. The coupling of the toroidal dipole modes in the twin-trimers can appear in both bonding and anti-bonding fashion resulting in different orders of the net toroidal dipole moment. Due to the unique field configuration of these modes, the proposed metasurfaces can be considered as a platform for efficient light–matter interaction for enhanced absorption, non-linear switching, and sensing.

show abstract

Microwave Approach to Study Resonant Features of All-dielectric Metasurfaces

Cited by 7 publications

References 21 publications

Toroidic and antitoroidic orders in hexagonal arrays of dielectric trimers: magnetic group approach

Toroidic and antitoroidic orders in hexagonal arrays of dielectric trimers: magnetic group approach

Symmetry analysis of trimer-based all-dielectric metasurfaces with toroidal dipole modes

Symmetry analysis of trimer-based all-dielectric metasurfaces with toroidal dipole modes

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