All-dielectric Mie-resonant metaphotonics

Bonod, Nicolas; Kivshar, Yuri S.

doi:10.5802/crphys.31

Cited by 14 publications

(10 citation statements)

References 109 publications

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“…Which obviously agrees with (23). Therefore taking (34) into account, the total reactance, [11] of the dielectric-air interface system associated to the evanescent wave is…”

Section: Case 1: Reactive Power Reactive Helicity and Reactive Moment...supporting

confidence: 72%

“…These results illustrate the concepts of reactive and stored power in and around a magnetodielectric, or Huygens, particle when choosing configurations and wavelengths such that the accretion of external reactive power and stored energy in the particle near-field, through the IPV alternating flow, be as large as possible; thus scattering with maximum efficiency W (s) , and possessing the highest possible Q-factor for applications in light-matter interactions, while its total reactive power W (s) react,T vanishes or is near zero at resonant wavelengths. Since, however, these magnetodielectric nanoresonators have rather low Q's (Q ≤ 7), external (and internal) stored power enhancements may be achieved either by sets of such magnetodielectric particles, even metal coated, using them as building blocks of photonic molecules, metasurfaces [62], or in regimes of bound states in the continuum [34,63].…”

Section: A Reactive Power and Stored Energymentioning

confidence: 99%

“…By contrast, at optical wavelengths a high reactive power outside the nanoemitter or scatterer, external stored energy, and Q-factor of a low-loss nanoparticle, or nanoantenna, enhances both its scattered (or radiated) power and frequency sensitivity, also narrowing its operational bandwith, this being desirable for its role as e.g. a nano-source or a biosensor, as well as to reinforce lightmatter interactions at the nanoscale, both in plasmonics [32] and Mie-tronics [33,34]. The reason is that, as we shall see, although such a large external reactive power and stored energy occur at wavelengths near those of resonant scattered power, the interior of the particle acts as a compensating (capacitive or inductive) element so that its reactive power and stored energy cancel out the external ones close to these resonant wavelengths at which each of these quantities have near extreme values.…”

Section: Introductionmentioning

confidence: 99%

“…Since surface plasmons work at optical frequencies where metals exhibit high losses, there has been an increasing interest in high refractive index nanoantennas, on which light exerts a magnetoelectric response with large electric and magnetic resonances [33][34][35][36][37][38][39][40]. We will study the key role of reactive quantities in the scattering from these magnetodielectric particles.…”

Section: Introductionmentioning

confidence: 99%

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Reactive helicity and reactive power in nanoscale optics: Evanescent waves. Kerker conditions. Optical theorems and reactive dichroism

Nieto‐Vesperinas¹,

Xu²

2021

Preprint

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Considering time-harmonic optical fields, we put forward the complex helicity and its alternating flow, together with their conservation equation: the complex helicity theorem. Its imaginary part constitutes a novel law that rules the build-up of what we establish as the reactive helicity through its zero time-average flow. Its associated reactive flow, and the imaginary Poynting momentum that accounts for the accretion of reactive power, are illustrated in two paradigmatic systems: evanescent waves and fields scattered from magnetodielectric dipolar nanoparticles. As for the former, we show that its reactive helicity may be experimentally detected; while we introduce the imaginary orbital and spin momenta of the wave through which we uncover a novel non-conservative optical force in the wavefield decaying direction, proportional to its reactive power density. Concerning the light scattered by magnetoelectric nanoparticles, we establish two optical theorems that govern the accretion of reactive helicity and reactive power on extinction of incident wave helicity and energy. Like a nule total -i.e. internal plus external -reactive power is at the root of a resonant scattered power, we show that a zero total reactive helicity underlies a resonant scattered helicity. These reactive quantities are shown to yield a novel interpretation of the two Kerker conditions which we demonstrate to be linked to an absence, or minimum, of the overall scattered reactive energy. Further, the first Kerker condition, under which the particle becomes dual on illumination with circularly polarized light, we demonstrate to amount to a nule overall scattered reactive helicity. Therefore, these two reactive quantities are shown to underly the directivity of the particle scattering and emission. In addition, we discover a discriminatory property of the reactive helicity of chiral light incident on a chiral nanoparticle by excitation of the external reactive power. This should be useful for optical near-field enantiomeric separation, an effect that we call reactive dichroism.

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“…Which obviously agrees with (23). Therefore taking (34) into account, the total reactance, [11] of the dielectric-air interface system associated to the evanescent wave is…”

Section: Case 1: Reactive Power Reactive Helicity and Reactive Moment...supporting

confidence: 72%

Section: A Reactive Power and Stored Energymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reactive helicity and reactive power in nanoscale optics: Evanescent waves. Kerker conditions. Optical theorems and reactive dichroism

Nieto‐Vesperinas¹,

Xu²

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In the quasi-BIC region of the avoided crossing, we have the interference of three waves in the far-field, two waves are determined by the resonant modes of a cylinder or ring (TE 1,1,0 and TM 1,1,1 ), and the third wave is associated with a nonresonant background. Such complicated interference is not described by the classical Fano formula; therefore, the statement that a collapse of the Fano resonance occurs in the quasi-BIC region [12,35,36] is correct. Accordingly, one should not expect a perfect fit according to the Fano formula where the condition of its applicability is not met.…”

Section: Resultsmentioning

confidence: 96%

Bound states in the continuum in strong-coupling and weak-coupling regimes under the cylinder – ring transition

et al. 2021

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Bound states in the continuum (BIC) have been at the forefront of research in optics and photonics over the past decade. It is of great interest to study the effects associated with quasi-BICs in the simplest structures, where quasi-BICs are very pronounced. An example is a dielectric cylinder, and in a number of works, quasi-BICs have been studied both in single cylinders and in structures composed of cylinders. In this work, we studied the properties of quasi-BICs during the transition from a homogeneous dielectric cylinder in an air environment to a ring with narrow walls while increasing the diameter of the inner air cylinder gradually. The results demonstrate the quasi-BIC crossover from the strong-coupling to the weak-coupling regime, which manifests itself in the transition from the avoided crossing of branches to their intersection with the quasi-BIC being preserved on only one straight branch. In the regime of strong-coupling and quasi-BIC, three waves interfere in the far-field zone: two waves corresponding to the resonant modes of the structure and the wave scattered by the structure as a whole. The validity of the Fano resonance concept is discussed since it describes the interference of only two waves under weak coupling conditions.

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Scalable Nanophotonic Structures Inside Silica Glass Laser‐Machined by Intense Shaped Beams

Datta,

Clady,

Grojo

et al. 2024

Laser & Photonics Reviews

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All‐dielectric nanophotonic devices are usually fabricated by engraving arrays of nanoholes at the surface of high‐index materials, to engineer dedicated optical functions. However, their direct 3D integration in the volume of a material is challenging, inaccessible to current planar nanolithography methods. Here is introduced an ultrafast laser‐machining method that opens the possibility to realize scalable arrays of hollow nanochannels directly inside the bulk of silica glass within a single‐step, maskless, and digital approach. Using a custom‐shaped micro‐Bessel beam and by tuning laser pulse durations from femtoseconds to picosecond to boost processing versatility, dense assemblies of nanochannels with adjustable lengths (up to 30 µm), and submicron lattice periodicity (down to 0.7 µm) are achieved. As a proof‐of‐principle demonstration, a gradient‐index metaphotonic structure is realized and its performance is experimentally characterized, demonstrating its relevancy for imprinting phase functions with magnitude up to in the short‐wave infrared spectral range. Results show that the unique flexibility and scalability provided by individual control of each channel opens a new realistic alternative approach for 3D fabrication of monolithic integrated nanophotonic devices inside a wide range of low‐index standard optical materials.

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All-dielectric Mie-resonant metaphotonics

Cited by 14 publications

References 109 publications

Reactive helicity and reactive power in nanoscale optics: Evanescent waves. Kerker conditions. Optical theorems and reactive dichroism

Reactive helicity and reactive power in nanoscale optics: Evanescent waves. Kerker conditions. Optical theorems and reactive dichroism

Bound states in the continuum in strong-coupling and weak-coupling regimes under the cylinder – ring transition

Scalable Nanophotonic Structures Inside Silica Glass Laser‐Machined by Intense Shaped Beams

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