Visualizing near-field coupling in terahertz dolmens

Halpin, Alexei; Mennes, Christiaan; Bhattacharya, Arkabrata; Rivas, Jaime Gómez

doi:10.1063/1.4978031

Cited by 10 publications

(6 citation statements)

References 37 publications

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“…Nonetheless, there are no fundamental works describing how to achieve robust BICs on a general basis, except for well-known symmetry-protected and accidental degeneracies appearing in photonic crystals [3] and asymmetric metasurfaces [7]. A variety of resonant phenomena, such as surface plasmon lattice resonances in the optical domain [13][14][15][16][17][18][19], Fano resonances [20][21][22][23][24][25][26], and electromagnetically induced transparency at optical and THz frequencies [27][28][29][30][31][32][33][34][35][36], have been reported in metasurfaces; however, robust symmetry-protected BICs remain unexplored. Metasurfaces are especially interesting for this purpose due to their enhanced collective response [21,26,[37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Spectral and temporal evidence of robust photonic bound states in the continuum on terahertz metasurfaces

Abujetas

Hoof

Huurne

et al. 2019

Optica

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184

123

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Section: Introductionmentioning

confidence: 99%

Spectral and temporal evidence of robust photonic bound states in the continuum on terahertz metasurfaces

Abujetas

Hoof

Huurne

et al. 2019

Optica

Self Cite

184

123

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“…Experiments have shown enhancements as large as 10–14 orders of magnitude, enabling spectroscopic detection of a single molecule. − Different shapes of nanoparticles have been studied such as nanoshells, , rods, , disks, cubes, cylinders, triangles, and rings . Among them, cylindrical nanowires and nanorods have received a lot of interest because their optical properties are very sensitive to their aspect ratio. − Arrays of nanoparticles are ideal for different applications like biosensing, , nanolasing, and spectroscopy , and as optical waveguides. − In consequence, a number of interesting studies have been performed on ordered arrays of nanoparticles − such as dolmen trimers − and end-to-end and side-by-side arrangements of nanorods. − …”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Optical Absorption Spectra of Parallel Nanowire Dimers and Dolmen Trimers

Pandeya

Aikens

2020

J. Phys. Chem. C

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Plasmonic nanoparticles are well-known for their properties of electromagnetic field enhancement and surface spectroscopy enhancement. We used the plasmon hybridization method and group theory to study parallel dimers and dolmen trimers of Ag n (n = 4, 6, and 10) nanoparticles. Interactions between the plasmon modes were studied with decreasing interparticle separation distances. Time-dependent density functional calculations are performed on the structures using the BP86/DZ level of theory. In dimers, the decrease of the interparticle separation blue-shifts the longitudinal peak, but the transverse peak position is not affected significantly. In trimers, a new peak is also observed as a shoulder of the longitudinal peak. When the interparticle separation reduces to 0.6 nm in dimers and trimers, a new peak emerges between the longitudinal and transverse peaks. This new peak red-shifts and increases in intensity upon further decreasing the interparticle separation. Analysis of the transition densities and symmetries for the respective peaks shows that the new peak arises from a charge transfer excitation.

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“…This transparency window is very modest for dolmens with a gap size distance of 10 μm separating the top dipolar resonator and the vertical quadrupolar resonator. This indicates that the near-field coupling between bright and dark resonators would need to be increased in order to generate significant EIT for the isolated dolmen structure [20].…”

Section: Resultsmentioning

confidence: 99%

Terahertz diffraction enhanced transparency probed in the near field

et al. 2017

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Electromagnetically induced transparency in metamaterials allows to engineer structures which transmit narrow spectral ranges of radiation while exhibiting a large group index. Implementation of this phenomenon frequently calls for strong near-field coupling of bright (dipolar) resonances to dark (multipolar) resonances in the metamolecules comprising the metamaterials. The sharpness and contrast of the resulting transparency windows thus depends strongly on how closely these metamolecules can be placed to one another, placing constraints on fabrication capabilities. In this manuscript, we demonstrate that the reliance on near-field interaction strength can be relaxed, and the magnitude of the electromagnetic-induced transparency enhanced, by exploiting the long-range coupling between metamolecules in periodic lattices. By placing dolmen structures resonant at THz frequencies in a periodic lattice, we show a significant increase of the transparency window when the in-plane diffraction is tuned to the resonant frequency of the metamolecules, as confirmed by direct mapping of the THz near-field amplitude across a lattice of dolmens. Through the direct interrogation of the dark resonance in the near field, we show the interplay of near-and far-field couplings in optimizing the response of planar dolmen arrays via diffraction-enhanced transparency.

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Visualizing near-field coupling in terahertz dolmens

Abstract: Articles you may be interested inBroadband optical absorption based on single-sized metal-dielectric-metal plasmonic nanostructures with high-ε ″ metals

Cited by 10 publications

References 37 publications

Spectral and temporal evidence of robust photonic bound states in the continuum on terahertz metasurfaces

Spectral and temporal evidence of robust photonic bound states in the continuum on terahertz metasurfaces

Theoretical Analysis of Optical Absorption Spectra of Parallel Nanowire Dimers and Dolmen Trimers

Terahertz diffraction enhanced transparency probed in the near field

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