Geometric tailoring of plasmonic nanotips for atom traps

Optical dipole-traps are used in various scientific fields, including classical optics, quantum optics and biophysics. Here, we propose and implement a dipole-trap for nanoparticles that is based on focusing from the full solid angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be on the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of solid-state targets. The obtained results demonstrate the feasibility of optical dipole-traps which simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

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“…Ref. [26]. For a refractive index of CdS at 1064 nm of n CdS = 2.344 we arrive at a polarizability α = 5.28 · 10 −35 Cm 2 /V.…”

Section: Concept Of a Deep Parabolic Mirror Dipole Trapmentioning

confidence: 92%

Optical trapping of nanoparticles by full solid-angle focusing

Salakhutdinov

Sondermann

Carbone

et al. 2016

Optica

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“…The physical mechanism described in this paper can be applied to any statistical ensemble of emitters in a nanoscale volume. However, the specific system which we have in mind is that of an optical fiber which is tapered down at one of its ends to a nanotip in order to increase interactions with dipole emitters nearby the tip [13][14][15][16]. We assume the tip is immersed into a gas of cold atoms with number density ρ, and a classical light field emerging from the fiber end excites atoms in a small volume V in front of its apex, figure 1.…”

Section: Light Statistics Of Ensemblesmentioning

confidence: 99%

Photon-antibunching in the fluorescence of statistical ensembles of emitters at an optical nanofiber-tip

et al. 2019

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This proposal investigates the photon-statistics of light emitted by a statistical ensemble of cold atoms excited by the near-field of an optical nanofiber tip. Dipole-dipole interactions of atoms at such short distance from each other suppress the simultaneous emission of more than one photon and lead to antibunching of photons. We consider a mean atom number on the order of one and deal with a Poissonian mixture of one and two atoms including dipole-dipole interactions and collective decay. Time tracks of the atomic states are simulated in quantum Monte Carlo simulations from which the g (2) -photon autocorrelation function is derived. The general results can be applied to any statistical ensemble of emitters that are interacting by dipole-dipole interactions.

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“…Consequently, a variation of geometry structures like nanotip, nanocavity, nano-bowtie, and nanopillar have been widely investigated for generating the localized surface plasmon modes for nanoscale particle trapping purposes [9][10][11][12][13]. Amongst them, the hybrid nanotip in particular exhibits great potential for flexibly controlling plasmon nanofocusing for nanoparticle trapping applications due to the intrinsic merit of a highly directional hotspot, as generated from the nanotip geometry [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Molecular-Scale Plasmon Trapping via a Graphene-Hybridized Tip-Substrate System

Lankanath

et al. 2022

Materials

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We theoretically investigated the plasmon trapping stability of a molecular-scale Au sphere via designing Au nanotip antenna hybridized with a graphene sheet embedded Silica substrate. A hybrid plasmonic trapping model is self-consistently built, which considers the surface plasmon excitation in the graphene-hybridized tip-substrate system for supporting the scattering and gradient optical forces on the optical diffraction-limit broken nanoscale. It is revealed that the plasmon trapping properties, including plasmon optical force and potential well, can be unprecedentedly adjusted by applying a graphene sheet at proper Fermi energy with respect to the designed tip-substrate geometry. This shows that the plasmon potential well of 218 kBT at room temperature can be determinately achieved for trapping of a 10 nm Au sphere by optimizing the surface medium film layer of the designed graphene-hybridized Silica substrate. This is explained as the crucial role of graphene hybridization participating in plasmon enhancement for generating the highly localized electric field, in return augmenting the trapping force acting on the trapped sphere with a deepened potential well. This study can be helpful for designing the plasmon trapping of very small particles with new routes for molecular-scale applications for molecular-imaging, nano-sensing, and high-sensitive single-molecule spectroscopy, etc.

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Geometric tailoring of plasmonic nanotips for atom traps

Cited by 5 publications

References 21 publications

Optical trapping of nanoparticles by full solid-angle focusing

Optical trapping of nanoparticles by full solid-angle focusing

Photon-antibunching in the fluorescence of statistical ensembles of emitters at an optical nanofiber-tip

Molecular-Scale Plasmon Trapping via a Graphene-Hybridized Tip-Substrate System

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