Excitation of a high-Q subradiant resonance mode in mirrored single-gap asymmetric split ring resonator terahertz metamaterials

Al-Naib, Ibraheem; Singh, Ranjan; Rockstuhl, Carsten; Lederer, F.; Delprat, S.; Rocheleau, David N.; Chaker, Mohamed; Ozaki, T.; Morandotti, Roberto

doi:10.1063/1.4745790

Cited by 85 publications

(46 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alternatively, a trapped mode can be excited in the polarization-insensitive metasurfaces whose unit cell comprises several particles arranged specifically (socalled super-cell [32][33][34][35][36] ). Although these metasurfaces possess a more complicated unit cell, their production complexity is the same as for the metasurfaces based on the ordinary single-particle unit cells.…”

Section: Arxiv:181111396v1 [Physicsoptics] 28 Nov 2018mentioning

confidence: 99%

“…42 The most straightforward way to construct a polarization-insensitive metasurface based on the same particles is to rearrange them within the 2 × 2 supercells, similarly to those proposed for the split ring based metasurfaces. 31,[33][34][35] For the normal wave incidence, symmetry of the super-cell in the x − y plane is described by the group C 4 which consists of the four-fold axis for rotation around the z-axis ( Fig. 2(b)).…”

Section: Theoretical Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

Controlling high- Q trapped modes in polarization-insensitive all-dielectric metasurfaces

Sayanskiy

Kupriianov

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

We reveal peculiarities of the trapped (dark) mode excitation in a polarization-insensitive alldielectric metasurface, whose unit super-cell is constructed by particularly arranging four cylindrical dielectric particles. Involving group-theoretical description we discuss in detail the effect of different orientations of particles within the super-cell on characteristics of the trapped mode. The theoretical predictions are confirmed by numerical simulations and experimental investigations. Since the metasurface is realized from simple dielectric particles without the use of any metallic components, they are feasibly scalable to both micro-and nanometer-size structures, and they can be employed in flat-optics platforms for realizing efficient light-matter interaction for multiple hotspot light localization, optical sensing, and highly-efficient light trapping.

show abstract

Section: Arxiv:181111396v1 [Physicsoptics] 28 Nov 2018mentioning

confidence: 99%

Section: Theoretical Descriptionmentioning

confidence: 99%

Controlling high- Q trapped modes in polarization-insensitive all-dielectric metasurfaces

Sayanskiy

Kupriianov

et al. 2019

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…The LC resonance mode originates in the coupled structure from the resonant electric currents oscillating around the circumference of the bright SRR resonator. [27][28][29] The oscillating current is induced by the incident electric field of the probing terahertz beam aligned parallel to the SRR gap arm of the bright resonator. The LC resonance is first excited in the bright SRR.…”

mentioning

confidence: 99%

Probing the transition from an uncoupled to a strong near-field coupled regime between bright and dark mode resonators in metasurfaces

Singh

Al-Naib

Chowdhury

et al. 2014

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

The coupling of multiple plasmonic resonators that sustain bright or dark modes provide intriguing spectral signatures. However, probing the onset of coupling effects while engaging the resonators with an increasing proximity has not yet been studied experimentally in detail. Nevertheless, this is of utmost importance to bridge the phenomenological understanding with the peculiarities of realworld-samples. Here, we take advantage of the ability to control spatial dimensions of THz metasurfaces deep in the sub-wavelength domain to study different regimes that occur while coupling split-ring-resonators that sustain a bright and a dark mode with increasing strength. We identify the length scales at which the resonators are uncoupled and then enter the regimes of weak, moderate, and strong coupling. It is shown that a strong coupling takes place only at distances smaller than one hundredth of the resonance wavelength. Understanding the features that emerge from such hybridization is important to take advantage of fundamental effects in metamaterials such as classical analogs of electromagnetically induced transparency, lasing spaser, near-field manipulation, and sensing with dark mode resonances. V C 2014 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4893726]Metasurfaces are thin films of artificially structured materials with unusual but highly beneficial electromagnetic properties. 1,2 These properties are provided at user-defined frequencies while relying on periodically or amorphously arranged unit cells with critical dimensions smaller than the operational wavelength. 2 While relying on unit cells, usually dubbed as meta-atoms that do provide an electromagnetic response that deviates from an ordinary electric dipole, properties inaccessible with naturally occurring materials fall within reach. 3-6 A canonical meta-atom in this stream of research is the split-ring-resonator (SRR) but many others can be considered as well. The key to tailor all anticipated properties upon demand is the ability to control the design and the geometrical detail of these meta-atoms with high precision.However, spectral properties with an even larger sophistication fall within reach while considering unit cells that consist of multiple coupled meta-atoms. These advanced unit cells are called metamolecules in analogy to metaatoms. A basic categorization of metamolecules can be made while considering designs for which the coupling is enforced by electromagnetic fields. [7][8][9][10][11][12][13][14][15] Recently, there have been several works where near-field coupling among metaatoms was investigated that sustain a bright and a dark mode. [8][9][10]14,15 The term bright and dark mode refers here to the ability to excite a particular resonance with the given polarization of the illumination if the individual metaatoms that form the metamolecule are uncoupled. These laterally coupled resonators lead to fascinating effects such as classical analogs of electromagnetically induced transparency and slow light. 9 However, the critical length-s...

show abstract

“…In a super cell composed of four unit cells, antiparallel surface currents that flow opposite to each other in the neighboring SRRs lead to effective cancellation of dipole moment and reduce the scattered field as illustrated in Figure b,c. A narrow FWHM bandwidth of 29 GHz was obtained in the THz range, which gives a Q ‐factor that is three times more than the non‐mirrored configurations . Besides considering the orientation or positioning of the unit cells in a lattice, the geometrical aspect of the SRRs was also explored.…”

Section: Classification Of Planar Metallic Fano Systemsmentioning

confidence: 99%

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Lim

Manjappa

Pitchappa

et al. 2018

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

Advances in plasmonic metamaterials have been rapidly evolving with innovations aimed at developing metadevices for real-world applications. In reality, energy losses in plasmonic systems are prevalent and it is of paramount importance to come up with solutions that could overcome the limitations that impede further advancements toward the miniaturization of optoelectronic metadevices. High-Q Fano resonance as a scattering phenomenon can be easily triggered by introducing asymmetry into plasmonic systems, and thus it offers a simple approach for reducing radiative losses through lineshape engineering. High-Q Fano resonance possesses narrow linewidth and intensely confined electromagnetic fields, which makes it viable for widespread applications. The purpose of this review is to consolidate the current advances and contributions that high-Q Fano resonance has made in the metamaterial community. Two general modes of energy loss including radiative and nonradiative losses are introduced and possible ways to overcome these challenges are examined. Furthermore, applications based on high-Q Fano resonance including sensors, lasing spasers, and optical switches are discussed, embracing the future of Fano resonance based high performance photonic technologies.

show abstract

Excitation of a high-Q subradiant resonance mode in mirrored single-gap asymmetric split ring resonator terahertz metamaterials

Cited by 85 publications

References 15 publications

Controlling high- Q trapped modes in polarization-insensitive all-dielectric metasurfaces

Controlling high- Q trapped modes in polarization-insensitive all-dielectric metasurfaces

Probing the transition from an uncoupled to a strong near-field coupled regime between bright and dark mode resonators in metasurfaces

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Contact Info

Product

Resources

About