Coupling of optical far fields into apertureless plasmonic nanofiber tips

Auwärter, David; Mihaljević, Josip; Meixner, Alfred J.; Zimmermann, C.; Slama, Sebastian

doi:10.1103/physreva.88.063830

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…To enhance the spatial resolution, optical throughput, and signal-to-noise ratio (SNR) beyond those of conventional a-tips and s-tips, several methods involving plasmonic nanofocusing with internal illumination − or side illumination , have recently been proposed. However, to date, no solution that meets the three aforementioned demands has been demonstrated.…”

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confidence: 99%

Near-Field Plasmonic Probe with Super Resolution and High Throughput and Signal-to-Noise Ratio

et al. 2018

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Near-field scanning optical microscopy (NSOM) enables observation of light-matter interaction with a spatial resolution far below the diffraction limit without the need for a vacuum environment. However, modern NSOM techniques remain subject to a few fundamental restrictions. For example, concerning the aperture tip (a-tip), the throughput is extremely low, and the lateral resolution is poor; both are limited by the aperture size. Meanwhile, with regard to the scattering tip (s-tip), the signal-to-noise ratio (SNR) appears to be almost zero; consequently, one cannot directly use the measured data. In this work, we present a plasmonic tip (p-tip) developed by tailoring subwavelength annuli so as to couple internal radial illumination to surface plasmon polaritons (SPPs), resulting in an ultrastrong, superfocused spot. Our p-tip supports both a radial symmetric SPP excitation and a Fabry-Pérot resonance, and experimental results indicate an optical resolution of 10 nm, a topographic resolution of 10 nm, a throughput of 3.28%, and an outstanding SNR of up to 18.2 (nearly free of background). The demonstrated p-tip outperforms state-of-the-art NSOM tips and can be readily employed in near-field optics, nanolithography, tip-enhanced Raman spectroscopy, and other applications.

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confidence: 99%

Near-Field Plasmonic Probe with Super Resolution and High Throughput and Signal-to-Noise Ratio

et al. 2018

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“…A second possibility not explored so far in order to manipulate the excitation zone would be to exploit the resonance shift of the atoms caused by the CP-potential and compensate it in a specific distance from the surface by the proper detuning. The fluorescence may be also collected by the nanotip which puts further restrictions on the atomic positions that contribute to the detected signal [14]. Using Purcell enhancement close to plasmonic nanotips a collection efficiency of more than 95% can be reached [13].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, manipulating the shape of the optical near-field, for instance by depositing tailored plasmonic nanostructureson the tip, may be a method to restrict the excitation of atoms to those positions where the antibunching is more pronounced. Moreover, the fluorescence may be also collected by the nanotip which puts further restrictions on the atomic positions that contribute to the detected signal [13]. As a final remark we would like to add that the method we introduce can be used also for other types of interactions, for instance van-der Waals interactions between Rydberg atoms [21].…”

Section: Discussionmentioning

confidence: 99%

“…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%

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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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“…Improved antibunching using single photon sources based on statistical ensembles at the tip of the ONFT is predicted numerically and theoretically [42]. Excitation of surface plasmons on gold-coated ONFTs and channeling them into guided modes of optical fibers have been shown experimentally [43].…”

Section: Introductionmentioning

confidence: 97%

Channeling of fluorescence photons from quantum dots into guided modes of an optical nanofiber tip

Bashaiah,

Yalla

2024

J. Opt.

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We demonstrate the channeling of fluorescence photons from quantum dots (QDs) into guided modes of an optical nanofiber tip (ONFT). We deposit QDs on the ONFT using micro/nano fluidic technology. We measure the photon-counting and emission spectrum of fluorescence photons that are channeled into guided modes of the ONFT. The measured emission spectrum confirms the deposition of QDs on the ONFT. We perform numerical simulations to determine channeling efficiency (η) for the ONFT and a single dipole source (SDS) system. For the radially oriented SDS at the center of the facet of the ONFT, we found the maximum η-value of 44% at the fiber size parameter of 7.16, corresponding to the ONFT radius of 0.71 μm for the emission wavelength at 620 nm. Additionally, we investigate the SDS position dependence in transverse directions on the facet of the ONFT in view of keeping experimental ambiguities. The present fiber inline platform may open new avenues in quantum technologies.

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Coupling of optical far fields into apertureless plasmonic nanofiber tips

Cited by 10 publications

References 18 publications

Near-Field Plasmonic Probe with Super Resolution and High Throughput and Signal-to-Noise Ratio

Near-Field Plasmonic Probe with Super Resolution and High Throughput and Signal-to-Noise Ratio

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

Channeling of fluorescence photons from quantum dots into guided modes of an optical nanofiber tip

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