Finite-Size and Illumination Conditions Effects in All-Dielectric Metasurfaces

Ciarella, Luca; Tognazzi, Andrea; Mangini, Fabio; Angelis, C. De; Pattelli, Lorenzo; Frezza, Fabrizio

doi:10.3390/electronics11071017

Cited by 10 publications

(5 citation statements)

References 52 publications

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“…Finally, we have extended our analysis to the lattice resonances of bipartite arrays, for which, depending on the geometry of their unit cell, excitation by finite-width light beams can result in symmetry breaking effects. Although we have focused on arrays of metallic nanoparticles, our theoretical approach can be readily extended to arrays made of other elements, such as dielectric nanostructures or atoms, − by using the appropriate polarizability. This work establishes a solid theoretical framework to understand the excitation of lattice resonances by light beams of finite-width, revealing a range of behaviors that are not present under plane-wave excitation.…”

Section: Discussionmentioning

confidence: 99%

Lattice Resonances Excited by Finite-Width Light Beams

et al. 2022

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Periodic arrays of metallic nanostructures support collective lattice resonances, which give rise to optical responses that are, at the same time, stronger and more spectrally narrow than those of the localized plasmons of the individual nanostructures. Despite the extensive research effort devoted to investigating the optical properties of lattice resonances, the majority of theoretical studies have analyzed them under plane-wave excitation conditions. Such analysis not only constitutes an approximation to realistic experimental conditions, which require the use of finite-width light beams, but also misses a rich variety of interesting behaviors. Here, we provide a comprehensive study of the response of periodic arrays of metallic nanostructures when excited by finite-width light beams under both paraxial and nonparaxial conditions. We show how as the width of the light beam increases, the response of the array becomes more collective and converges to the plane-wave limit. Furthermore, we analyze the spatial extent of the lattice resonance and identify the optimum values of the light beam width to achieve the strongest optical responses. We also investigate the impact that the combination of finite-size effects in the array and the finite width of the light beam has on the response of the system. Our results provide a solid theoretical framework to understand the excitation of lattice resonances by finite-width light beams and uncover a set of behaviors that do not take place under plane-wave excitation.

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Section: Discussionmentioning

confidence: 99%

Lattice Resonances Excited by Finite-Width Light Beams

et al. 2022

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“…2, the experimentally measured polarization angle resolved absorption spectra show almost the same results as the full wave simulations, which are based on an infinite extended metamaterials obtained by periodically exploiting the elementary unit cell through the Floquet's theorem 27,28 . However, from the aspect of practical device fabrication, the finiteness of the array size and the boundary effects of the nano/micro-structure array should be considered 29 . Here, to investigate the finite-size effect of the perfect plasmonic absorber, we first prepared the perfect plasmonic absorbers with different array edge lengths (Fig.…”

Section: Local Absorption Of the Metamaterials With Finite-size Effectmentioning

confidence: 99%

Long-wave infrared photothermoelectric detectors with ultrahigh polarization sensitivity

et al. 2023

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Filter-free miniaturized polarization-sensitive photodetectors have important applications in the next-generation on-chip polarimeters. However, their polarization sensitivity is thus far limited by the intrinsic low diattenuation and inefficient photon-to-electron conversion. Here, we implement experimentally a miniaturized detector based on one-dimensional tellurium nanoribbon, which can significantly improve the photothermoelectric responses by translating the polarization-sensitive absorption into a large temperature gradient together with the finite-size effect of a perfect plasmonic absorber. Our devices exhibit a zero-bias responsivity of 410 V/W and an ultrahigh polarization ratio (2.5 × 104), as well as a peak polarization angle sensitivity of 7.10 V/W•degree, which is one order of magnitude higher than those reported in the literature. Full linear polarimetry detection is also achieved with the proposed device in a simple geometrical configuration. Polarization-coded communication and optical strain measurement are demonstrated showing the great potential of the proposed devices. Our work presents a feasible solution for miniaturized room-temperature infrared photodetectors with ultrahigh polarization sensitivity.

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“…Dielectric metasurfaces have emerged as a promising technology for sensing applications and non-linear frequency conversion, and for their flexibility to shape the emission pattern in the visible regime. In paper [8], finite-size metasurfaces and beam-like illumination conditions are investigated in contrast to the typical infinite plane-wave illumination compatible with the Floquet theorem.…”

Section: The Special Issuementioning

confidence: 99%