Boosting the directivity of optical antennas with magnetic and electric dipolar resonant particles

Rolly, Brice; Stout, Brian; Bonod, Nicolas

doi:10.1364/oe.20.020376

Cited by 197 publications

(174 citation statements)

References 36 publications

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“…As is the case for Kerker scattering in dielectric/semiconductor nanoparticles [21][22][23][24]27 , strong directionality is expected only when the different multipole components are similar in magnitude as that allows effective interference in the far field. Evidently this condition is not met for the D ¼ 50 nm disk, where the pattern is fully dominated by p z and no beaming is observed.…”

Section: Discussionmentioning

confidence: 95%

“…However, these array antennas are complex to design and fabricate, and have a relatively large spatial footprint. Strong directionality can also be achieved using just a single element antenna if the interference between electric dipole and higher-order multipole components can be controlled [21][22][23][24][25][26][27][28] . However, efficient excitation of higher-order magnetic and electric multipoles requires strong field gradients on the scale of the nanoparticle, which is difficult to obtain using plane wave excitation.…”

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confidence: 99%

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Directional emission from a single plasmonic scatterer

et al. 2014

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Directing light emission is key for many applications in photonics and biology. Optical antennas made from nanostructured plasmonic metals are suitable candidates for this purpose but designing antennas with good directional characteristics can be challenging, especially when they consist of multiple elements. Here we show that strongly directional emission can also be obtained from a simple individual gold nanodisk, utilizing the far-field interference of resonant electric and magnetic modes. Using angle-resolved cathodoluminescence spectroscopy, we find that the spectral and angular response strongly depends on excitation position. For excitation at the nanodisk edge, interference between in-plane and out-of-plane dipole components leads to strong beaming of light. For large nanodisks, higher-order multipole components contribute significantly to the scattered field, leading to enhanced directionality. Using a combination of full-wave simulations and analytical point scattering theory we are able to decompose the calculated and measured scattered fields into dipolar and quadrupolar contributions.

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Section: Discussionmentioning

confidence: 95%

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confidence: 99%

Directional emission from a single plasmonic scatterer

et al. 2014

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“…These modes can be easily and efficiently excited either from near or far field illumination [1][2][3]. This novel class of photonic resonators is very promising to design directive antennas [4][5][6], to enhance the electric or magnetic near field intensities [7][8][9][10], to design subwavelength sized light cavities [8,11,12], to host frequency mixing processes such as third harmonic generation [13], and even to create isotropically polarized speckle patterns [14].…”

Section: Introductionmentioning

confidence: 99%

Purcell factor of spherical Mie resonators

Zambrana‐Puyalto

Bonod²

2015

Phys. Rev. B

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139

112

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We present a modal approach to compute the Purcell factor in Mie resonators exhibiting both electric and magnetic resonances. The analytic expressions of the normal modes are used to calculate the effective volumes. We show that important features of the effective volume can be predicted thanks to the translation-addition coefficients of a displaced dipole. Using our formalism, it is easy to see that, in general, the Purcell factor of Mie resonators is not dominated by a single mode, but rather by a large superposition. Finally we consider a silicon resonator homogeneously doped with electric dipolar emitters, and we show that the average electric Purcell factor dominates over the magnetic one.arXiv:1501.07452v2 [physics.optics]

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“…However, to date no experimental proof of this concept in the optical spectral range has been demonstrated. Realization of such relatively simple nano-optical systems having both electric and magnetic dipole resonances with shifted phases would allow scaling the optical nanoantenna concept down to a single nanoparticle, which can redirect incoming light in different directions depending on wavelength and size 17,18,36,37 .…”

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confidence: 99%

Directional visible light scattering by silicon nanoparticles

et al. 2013

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Directional light scattering by spherical silicon nanoparticles in the visible spectral range is experimentally demonstrated for the first time. These unique optical properties arise because of simultaneous excitation and mutual interference of magnetic and electric dipole resonances inside a single nanosphere. Such behaviour is similar to Kerker's-type scattering by hypothetic magneto-dielectric particles predicted theoretically three decades ago. Here we show that directivity of the far-field radiation pattern of single silicon spheres can be strongly dependent on the light wavelength and the nanoparticle size. For nanoparticles with sizes ranging from 100 to 200 nm, forward-to-backward scattering ratio above six can be experimentally obtained, making them similar to 'Huygens' sources. Unique optical properties of silicon nanoparticles make them promising for design of novel low-loss visible-and telecom-range metamaterials and nanoantenna devices.

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Boosting the directivity of optical antennas with magnetic and electric dipolar resonant particles

Cited by 197 publications

References 36 publications

Directional emission from a single plasmonic scatterer

Directional emission from a single plasmonic scatterer

Purcell factor of spherical Mie resonators

Directional visible light scattering by silicon nanoparticles

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