Toward Lossless Infrared Optical Trapping of Small Nanoparticles Using Nonradiative Anapole Modes

Hernández-Sarria, J. J.; Oliveira, Osvaldo N.; Mejía‐Salazar, J. R.

doi:10.1103/physrevlett.127.186803

Cited by 25 publications

(33 citation statements)

References 40 publications

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“…The trapping energy was calculated using a line integral path of the optical force along the z -axis, defining U z = 0 at z = 160 nm (see Figure c). As demonstrated numerically in ref , the optical potentials depend on the nanoparticle refractive index and height above the nanodisk. Hence, the distance between two nanoparticles and the stiffness of their optical trapping can be manipulated.…”

Section: Resultsmentioning

confidence: 70%

“…Anapole states with orders higher than the first exhibit sharper resonances with stronger energy concentration, as observed experimentally . Although the electromagnetic hotspots from anapole resonances are normally found inside the elementary scatterers, − recent research indicated localization at the external region using small slots in dielectric nanodisks. , This finding is the basis for lossless trapping of small nanoparticles using anapole modes, with optical forces to trap nanoparticles with radii as small as 15 nm …”

Section: Introductionmentioning

confidence: 71%

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Numerical Simulations of Double-Well Optical Potentials in All-Dielectric Nanostructures for Manipulation of Small Nanoparticles in Aqueous Media

Hernández-Sarria

Oliveira

Mejía‐Salazar

2023

ACS Appl. Nano Mater.

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The manipulation of molecules placed in close proximity to a liquid is crucial for understanding their interactions, as in the study of antibiotics against bacteria. This can, in principle, be realized with plasmonic optical tweezers, but the heating of metals leads to the denaturing of biomolecules. In this work, we demonstrate that slotted all-dielectric nanodisks made of amorphous silicon (a-Si) exhibit double-well optical potentials, which can be used to stably trap dielectric nanoparticles with radii as small as 15 nm using infrared wavelengths where there is no optical loss (no heating) for a-Si. The latter is important to avoid heating the surrounding environment, which in turn, generates fluid convection currents that would compromise optical trapping. The trapping of one and two nanoparticles (even with different morphologies) in water is demonstrated in numerical results for an all-dielectric nanostructure, which can be obtained with standard materials and nanofabrication methods. The trapping forces are only slightly affected by the morphology of the small dielectric nanoparticles, thus indicating that the trapping approach may be applied to a variety of biomolecules.

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Section: Resultsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 71%

Numerical Simulations of Double-Well Optical Potentials in All-Dielectric Nanostructures for Manipulation of Small Nanoparticles in Aqueous Media

Hernández-Sarria

Oliveira

Mejía‐Salazar

2023

ACS Appl. Nano Mater.

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“…The defining nonradiating condition of the anapole relies on the fine balance between the constituent electric dipole and toroidal dipole excitations. Consequently, such excitations are expected to be highly sensitive to external perturbations including variations in the ambient refractive index [30][31][32]. Compared with conventional dipole modes with low transmission, anapole modes can acquire the effective transmission channel due to the nonradiative property, which is beneficial to practical low-loss sensors [25,33].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic anapole metamaterial for refractive index sensing

Yao

Savinov

et al. 2022

PhotoniX

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Electromagnetic anapole mode is a nonradiative state of light originating from the deconstructive interference of radiation of the oscillating electric and toroidal dipole moments. The high quality anapole-related resonances can be used in enhancing nonlinear electromagnetic properties of materials and in sensor applications. In this work, we experimentally demonstrate plasmonic anapole metamaterial sensor of environmental refractive index in the optical part of the spectrum. Our results show that the sensor exhibits high sensitivity to the ambient refractive index at the level of 330 nm/RIU and noise floor of 8.7 × 10-5 RIU. This work will pave the way for applications of anapole metamaterials in biosensing and spectroscopy.

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“…Under certain conditions, the destructive interference between dipole and toroidal moments may result in suppressed scattering accompanied by strongly enhanced near fields. The corresponding practically radiationless states are called anapole states. , The unique properties of anapole states reveal an exciting potential in many applications such as cloaking, , nanoscale lasers, field enhancements, , energy guiding, , harmonic generations, − metamaterials, ,− and optical trapping …”

mentioning

confidence: 99%

“…3,4 The unique properties of anapole states reveal an exciting potential in many applications such as cloaking, 5,6 nanoscale lasers, 7 field enhancements, 8,9 energy guiding, 10,11 harmonic generations, 12−14 metamaterials, 1,15−17 and optical trapping. 18 It is important to emphasize that the far-field excitation of a pure nonradiating anapole state is problematic due to the reciprocity principle unless some specially designed illumination is used as, for instance, a combination of counterpropagating strongly focused radially polarized beams. 6,19 In practice, the formation of an anapole state is usually referred to when the suppression of a dominant (radiative) multipole moment is achieved.…”

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confidence: 99%

Anapole States in Gap-Surface Plasmon Resonators

et al. 2022

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Anapole states associated with the destructive interference between dipole and toroidal moments result in suppressed scattering accompanied by strongly enhanced near fields. In this work, we comprehensively examine the anapole state formation in metal–insulator–metal configurations supporting gap surface-plasmon (GSP) resonances that are widely used in plasmonics. Using multipole decomposition, we show that in contrast to the common case of dielectric particles with out-of-phase superposition of electric and toroidal dipoles anapole states in GSP resonators are formed due to the compensation of magnetic dipole moments. Unlike anapole states in dielectric particles, magnetic anapole states in GSP resonator does not provide a pronounced suppression of scattering, but it features huge electric field enhancement, which we verify by numerical simulations and two-photon luminescence measurements. This makes the GSP resonator configuration very promising for use in a wide range of applications, ranging from nonlinear harmonic generation to absorption enhancement and sensing.

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Toward Lossless Infrared Optical Trapping of Small Nanoparticles Using Nonradiative Anapole Modes

Cited by 25 publications

References 40 publications

Numerical Simulations of Double-Well Optical Potentials in All-Dielectric Nanostructures for Manipulation of Small Nanoparticles in Aqueous Media

Numerical Simulations of Double-Well Optical Potentials in All-Dielectric Nanostructures for Manipulation of Small Nanoparticles in Aqueous Media

Plasmonic anapole metamaterial for refractive index sensing

Anapole States in Gap-Surface Plasmon Resonators

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