All-Optical Nanometric Switch Based on the Directional Scattering of Semiconductor Nanoparticles

García‐Cámara, Braulio; Algorri, José Francisco; Cuadrado, Alexander; Urruchi, V.; Sánchez‐Pena, José Manuel; Serna, Rosalía; Vergaz, Ricardo

doi:10.1021/acs.jpcc.5b06302

Cited by 30 publications

(22 citation statements)

References 48 publications

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“…In a previous study, we showed that the directionality of light scattering of semiconductor nanoparticles can be used to produce either "hot-spots" or "dark-spots" in a dimer geometry [16]. This effect, together with the strong sensitivity of Kerker's conditions with the wavelength, allows the design of a new generation of nanodevices for futuristic applications, such as an all-optical nanoswitch [16].…”

Section: Resultsmentioning

confidence: 96%

“…This effect, together with the strong sensitivity of Kerker's conditions with the wavelength, allows the design of a new generation of nanodevices for futuristic applications, such as an all-optical nanoswitch [16]. In addition, the concentration or lack of the scattered light in the gap region affects to the interaction between the nanoparticles, in particular due to interferential phenomena.…”

Section: Resultsmentioning

confidence: 99%

“…Other recent works show that nanoscale optical switches based in semiconductor nanoparticles are achieved by using ultrafast photoinjection of electron-hole plasma in a single nanoparticle [14] or by two-photon absorption to switch the magnetic Mie resonance [15]. In this sense, we also proposed an all-optical switch based on the directional scattering of semiconductor nanoparticles [16]. This effect, experimentally demonstrated in [17,18], shows that the directional control over the scattered field can be achieved at certain wavelengths in dielectric nanoparticles, thanks to the coherent interaction between electric and magnetic resonances.…”

Section: Introductionmentioning

confidence: 91%

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Control of the Light Interaction in a Semiconductor Nanoparticle Dimer Through Scattering Directionality

et al. 2016

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Dimers of nanoparticles are very interesting for several devices due to the possibility to obtain intense light concentrations in the gap between them. A dynamic control of this interaction to obtain either a maximum or a minimum of light through interferential effects could be also relevant for a multitude of devices, such as chemical sensors or all-optical devices for inter/intra-chip communications. Semiconductor nanoparticles satisfying Kerker conditions present an anisotropic scattering distribution with a minimum in either the forward or the backward direction, and a prominent scattering in the contrary direction. The reduction or enhancement of the electromagnetic field in a certain direction can minimize or maximize the interaction with neighboring nanoparticles. In this work, we consider a dimer of nanoparticles such that each component satisfies each one of the Kerker conditions. Depending on the arrangement of the nanoparticles respect with the impinging light direction, we can produce a minimum or a maximum of the electric field between them, reducing or maximizing the interferential effects. The strong dependence of the directional conditions with external conditions, such as the incident wavelength, can be used to dynamically control the light concentration in the gap.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

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Control of the Light Interaction in a Semiconductor Nanoparticle Dimer Through Scattering Directionality

et al. 2016

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“…where the integration is again carried out over the surface of an imaginary sphere that surrounds the particle, being 0 I the incoming irradiance, s σ the scattering cross-section, ( ) s c S the Poynting vector of the scattered radiation at a given point of the surface of the sphere, n the normal vector at the same point, and θ the polar angle defined as the angle formed by the direction vector of the incoming radiation and the normal vector n. In our study, we have used the far-field pattern for computing both the cross-section and the asymmetry coefficient according to [28,32,36].…”

Section: Theoretical Foundationsmentioning

confidence: 99%

Numerical model of the inhomogeneous scattering by the human lens

Cuadrado¹,

Sanchez‐Brea²,

Torcal-Milla³

et al. 2019

Biomed. Opt. Express

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We present in this work a numerical model for characterizing the scattering properties of the human lens. After analyzing the scattering properties of two main scattering particles actually described in the literature through FEM (finite element method) simulations, we have modified a Monte Carlo's bulk scattering algorithm for computing ray scattering in non-sequential ray tracing. We have implemented this ray scattering algorithm in a layered model of the human lens in order to calculate the scattering properties of the whole lens. We have tested our algorithm by simulating the classic experiment carried out by Van der Berg et al for measuring "in vitro" the angular distribution of forward scattered light by the human lens. The results show the ability of our model to simulate accurately the scattering properties of the human lens.

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“…On these bases, a new energetically viable GSKC was proposed by Nieto-Vesperinas et al: α 1 = −β 1 [7]. So far, this was thought to be the optimized condition that gives rise to a negative g parameter, which in turn might reduce the scattered light in the forward direction [61]. Surprisingly, it is straightforward to notice via Eq.…”

mentioning

confidence: 99%

Optimal backward light scattering by dipolar particles

Olmos‐Trigo

Abujetas

Sanz-Fernández

et al. 2020

Phys. Rev. Research

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The near-zero forward intensity condition for light scattering by a dielectric dipolar sphere is usually associated with the generalized second Kerker condition, at which equal amplitude electric and magnetic dipolar responses are phase-shifted by π . As we show, this condition does lead to optimal backward light scattering for a given scattering cross section. However, it is clearly insufficient to give rise to the nearly zero optical forward scattering, in striking contrast to the actual view of the problem. In fact, we show that the generalized second Kerker condition leads to an energy radiation pattern that ranges all possible optical scattering diagrams depending on the total scattering cross section. Interestingly, we demonstrate that optimization of backward intensity, near the electric and magnetic dipolar resonances, leads to the counterintuitive result of a far-field energy radiation pattern with nearly zero backscattering.The conditions of perfect zero light scattering from magnetic spheres were brought to the physical scene by Kerker, Wang and Giles [1] by assuming magnetodielectric spheres with a particular combination of relative electric permittivity and magnetic permeability μ. They proved that when = μ, the backscattered radiation from the sphere is identical to zero. In contrast, for very small particles, when = (4−μ)/(2μ+1), the forward scattering was shown to be reduced to zero, except for the peculiar case of = μ = −2 [2].The study of these two optical responses, often referred to as Kerker conditions and, in particular, the inconsistency between the zero-forward condition and the optical theorem, have attracted a great interest [2][3][4][5][6]. The apparent paradox was solved by Alù and Engheta [5] by introducing the concept of near-zero-forward condition for magnetic Rayleigh particles. Kerker conditions, originally discussed for hypothetical magnetodielectric particles, were later shown to apply to subwavelength dielectric (μ = 1) particles of high refractive index (HRI) materials [7,8]. Remarkably, the scattering properties of these HRI nano-particles are given by their dipolar electric and magnetic responses [9][10][11][12][13][14].For HRI subwavelength isotropic spheres, the scattering can be fully described by the first electric, a 1 , and magnetic, b 1 , Mie coefficients [15],* where the phase-shifts α 1 and β 1 are real in the absence of absorption. Under plane wave illumination, the intensity in the backscattering direction can be exactly zero whenever a 1 = b 1 ⇔ α 1 = β 1 , independently of any other particle's material property [7]. At this condition, the particle's optical response consists of equal amplitude crossed electric-and magneticinduced dipoles oscillating in-phase (first Kerker condition), leading to destructive interference between scattered fields in backscattering. This prediction was experimentally demonstrated first for millimeter-scale ceramic spheres in the microwave regime [16] and shortly after for nanometer-scale HRI Si [17] and GaAs [18] nanospheres. Since ...

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All-Optical Nanometric Switch Based on the Directional Scattering of Semiconductor Nanoparticles

Cited by 30 publications

References 48 publications

Control of the Light Interaction in a Semiconductor Nanoparticle Dimer Through Scattering Directionality

Control of the Light Interaction in a Semiconductor Nanoparticle Dimer Through Scattering Directionality

Numerical model of the inhomogeneous scattering by the human lens

Optimal backward light scattering by dipolar particles

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