Optical band engineering via vertical stacking of honeycomb plasmonic lattices

Becerril, David; Pirruccio, Giuseppe; Noguez, Cecilia

doi:10.1103/physrevb.103.195412

Cited by 4 publications

(2 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They have been recently exploited to realize interesting effects in the field of flat optics 15 , 16 , topological photonics 17 and generation of geometrical phases 18 , 19 . Recently, the focus has shifted to vertical stacking of patterned layers 20 where the interlayer distance and the layers number may act as a new degree of freedom to modify the optical band structure. The subject is presently far from being exhausted.…”

Section: Introductionmentioning

confidence: 99%

Terahertz waves dynamic diffusion in 3D printed structures

Missori

Pilozzi

Conti

2022

Sci Rep

View full text Add to dashboard Cite

Applications of metamaterials in the realization of efficient devices in the terahertz band have recently been considered to achieve wave deflection, focusing, amplitude manipulation and dynamical modulation. Terahertz metamaterials offer practical advantages since their structures have typical sizes of hundreds microns and are within the reach of current three-dimensional (3D) printing technologies. Here, we propose terahertz photonic structures composed of dielectric rods layers made of acrylonitrile styrene acrylate realized by low-cost, rapid, and versatile fused deposition modeling 3D-printing. Terahertz time-domain spectroscopy is employed for the experimental study of their spectral and dynamic response. Measured spectra are interpreted by using simulations performed by an analytical exact solution of the Maxwell equations for a general incidence geometry, by a field expansion as a sum over reciprocal lattice vectors. Results show that the structures possess specific spectral forbidden bands of the incident THz radiation depending on their optical and geometrical parameters. We also find evidence of disorder in the 3D printed structure resulting in the closure of the forbidden bands at frequencies above 0.3 THz. The size disorder of the structures is quantified by studying the dynamics diffusion of THz pulses as a function of the numbers of layers of dielectric rods. Comparison with simulations of light diffusion in photonic crystals with increasing disorder allows estimating the size distributions of elements. By using a Mean Squared Displacement model, from the broadening of the pulses’ widths it is also possible to estimate the diffusion coefficient of the terahertz radiation in the photonic structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Terahertz waves dynamic diffusion in 3D printed structures

Missori

Pilozzi

Conti

2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…All kinds of photonic crys- * Ilia.Fradkin@skoltech.ru tals and metasurfaces were studied intensively for the last several decades, and their optical properties are known in much detail. In recent years there was a growth of attention to stacks of metasurfaces [29][30][31][32][33][34][35][36][37][38] due to the new opportunities that they provide for the control and manipulation of light. Simultaneously, much fewer studies considered the interaction of crystals that do not have a mutual lattice either because of the periods discrepancy or even misalignment of crystallographic axes.…”

Section: Introductionmentioning

confidence: 99%

Fourier modal method for Moiré lattices

Karmanova,

Fradkin,

Dyakov

et al. 2021

Preprint

View full text Add to dashboard Cite

In recent years twisted bi-layers of 2D materials became very popular in the field due to the possibility to totally change their electronic properties by simple rotation. At the same time, in the wide field of photonic crystals, this idea still remains almost untouched, and only some particular problems were considered. One of the reasons is the computational difficulty of the accurate consideration of Moiré superlattices that appear due to the superimposition of misaligned lattices. Indeed, the unit cell of the complex lattice is typically much larger than the original crystals and requires much more computational resources for the computations. Here, we propose a careful adaptation of the Fourier modal method in the form of the scattering matrices for the description of twisted 1D gratings' stacks. Our approach allows us to consider sublattices in close vicinity to each other and account for their interaction via the near-field. In the developed numerical scheme, we utilize the fact that each sublattice is only 1D-periodic and therefore simpler than the resulting 2D superlattice, as well as the fact that even a small gap between the lattices filters out high Fourier harmonics due to their evanescent origin. This accelerates the computations from 1 up to 3 and more orders of magnitude for typical structures depending on the number of harmonics. This paves the way for rigorous study of almost any photonic crystals of the proposed geometry and demonstration of specific Moiré-associated effects.

show abstract