Linearly dichroic plasmonic lens and hetero-chiral structures

Spektor, Grisha; David, Asaf; Gjonaj, Bergin; Gal, Lior; Bartal, Guy; Orenstein, Meir

doi:10.1364/oe.24.002436

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…The measured SNR is calculated in Figure f, manifesting an excellent value as high as 18.2 for the zeroth order (dc) signal. Our p-tip thus substantially outperforms the conventional s-tip. − …”

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confidence: 90%

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: 90%

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

et al. 2018

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“…Particularly, SPPs have the potential of confining fields that carry OAM to subwavelength dimensions. Archimedean spirals (14) and related nanostructures (24)(25)(26)(27) were demonstrated to generate and control OAM-carrying plasmonic vortices under different illuminations. These advances provided many insights (28)(29)(30)(31) into the nature of OAM, opening the door toward several exciting applications (32,33).…”

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confidence: 99%

Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices

Spektor

Kilbane

Mahro

et al. 2017

Science

246

235

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The ability of light to carry and deliver orbital angular momentum (OAM) in the form of optical vortices has attracted much interest. The physical properties of light with a helical wavefront can be confined onto two-dimensional surfaces with subwavelength dimensions in the form of plasmonic vortices, opening avenues for thus far unknown light-matter interactions. Because of their extreme rotational velocity, the ultrafast dynamics of such vortices remained unexplored. Here we show the detailed spatiotemporal evolution of nanovortices using time-resolved two-photon photoemission electron microscopy. We observe both long- and short-range plasmonic vortices confined to deep subwavelength dimensions on the scale of 100 nanometers with nanometer spatial resolution and subfemtosecond time-step resolution. Finally, by measuring the angular velocity of the vortex, we directly extract the OAM magnitude of light.

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“…The two modes can be simultaneously excited when the polarization and slit orientations are at an angle [25][26][27][28][29], which has empirically been used in manipulations of wavefields such as the design of quantum eraser [28]. Instead of the usually used circularly polarized illuminations, the manipulations of SPP wavefields based on linearly polarized illuminations [30][31][32][33][34] have recently attracted more and more interests, such as SPP focusing [35][36][37][38][39]. However, in most of these applications, the slit widths of the designed structures are often smaller than the cutoff width for the photonic mode excitation [40,41], and photonic modes together with their influences on the polarization are rarely considered.…”

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confidence: 99%

Slit width oriented polarized wavefields transition involving plasmonic and photonic modes

Zhang

et al. 2018

New J. Phys.

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Wavefield manipulation of surface plasmon polaritons (SPPs) is one of the fundamental subjects in nanophtonics. In this paper, based on the analyses of the plasmonic and photonic modes of the L-shaped slit samples with different widths, the dependence of the wavevector, amplitude and phase of the scattered wavefields on the slit width are experimentally determined. The excited plasmonic mode and photonic mode wavelets by arbitrary slit element is analyzed theoretically. Au ring-slits with different widths are also experimented as general slit structure to show the polarized patterns originated from the superimposition of the two modes, and the evolution of total and polarized intensity patterns with the ring-slit widths is studied systematically. The wavefield patterns of the polarization components are also calculated with the obtained components of wavefields and Huygens-Fresnel principle, and results of calculations and experiments are coincident. In addition, the results are validated by performing finite-difference time-domain simulations. The work may enhance the efficiency of slit engineering for SPP pattern manipulations and can be a helpful reference for the fabrication of nano-optics devices.

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Linearly dichroic plasmonic lens and hetero-chiral structures

Cited by 7 publications

References 26 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

Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices

Slit width oriented polarized wavefields transition involving plasmonic and photonic modes

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