Optimization of a nanotip on a surface for the ultrafast probing of propagating surface plasmons

Ahn, B.; Schötz, Johannes; Okell, William; Süßmann, Frederik; Förg, Benjamin; Kim, S. C.; Kling, Matthias F.; Kim, D.

doi:10.1364/oe.24.000092

Cited by 8 publications

(9 citation statements)

References 51 publications

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“…The field enhancement rises with decreasing tip radius, as can be expected from geometrical arguments. 36,37 In contrast to conical metal nanotips, the nanowire can exhibit a rather large field enhancement because of its crystal termination at the apex, which in principle allows much smaller radii, potentially down close to the single-atom scale. Experimentally it proved difficult to rotate the nanowire in situ in the experiments while keeping the alignment of the wire with respect to the laser focus.…”

Section: Resultsmentioning

confidence: 99%

Attosecond-controlled photoemission from metal nanowire tips in the few-electron regime

et al. 2017

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Extreme nonlinear terahertz electro-optics in diamond for ultrafast pulse switching APL Photonics 2, 036106 (2017) Metal nanotip photoemitters have proven to be versatile in fundamental nanoplasmonics research and applications, including, e.g., the generation of ultrafast electron pulses, the adiabatic focusing of plasmons, and as light-triggered electron sources for microscopy. Here, we report the generation of high energy photoelectrons (up to 160 eV) in photoemission from single-crystalline nanowire tips in few-cycle, 750-nm laser fields at peak intensities of (2-7.3) × 10 12 W/cm 2 . Recording the carrier-envelope phase (CEP)-dependent photoemission from the nanowire tips allows us to identify rescattering contributions and also permits us to determine the high-energy cutoff of the electron spectra as a function of laser intensity. So far these types of experiments from metal nanotips have been limited to an emission regime with less than one electron per pulse. We detect up to 13 e/shot and given the limited detection efficiency, we expect up to a few ten times more electrons being emitted from the nanowire. Within the investigated intensity range, we find linear scaling of cutoff energies. The nonlinear scaling of electron count rates is consistent with tunneling photoemission occurring in the absence of significant charge interaction. The high electron energy gain is attributed to field-induced rescattering in the enhanced nanolocalized fields at the wires apex, where a strong CEP-modulation is indicative of the attosecond control of photoemission. © 2017 Author(s)

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Section: Resultsmentioning

confidence: 99%

Attosecond-controlled photoemission from metal nanowire tips in the few-electron regime

et al. 2017

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“…Widely used numerical methods in nano-optics are the finite element method, the finite-difference time-domain (FDTD) method or the boundary element method (BEM) (Taflove and Hagness 2005). In the context of strong-field photoemission, both FDTD and BEM have been successfully applied (see, for example, the works of Yanagisawa et al (2009Yanagisawa et al ( , 2010, Thomas et al (2013Thomas et al ( , 2015, Förg et al (2016), Ahn et al (2016Ahn et al ( , 2017 for FDTD and the study of (Thomas et al 2015) for BEM). In addition, a discontinuous Galerkin time-domain method has been developed for nanotips (Swanwick et al 2014).…”

Section: Near-fields At Nanotipsmentioning

confidence: 99%

Attosecond physics phenomena at nanometric tips

Krüger

Lemell

Wachter

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

112

103

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Attosecond science is based on electron dynamics driven by a strong optical electric field and has evolved beyond its original scope in gas-phase atomic and molecular physics to solid-state targets. In this review, we discuss a nanoscale attosecond physics laboratory that has enabled the first observations of strong-field-driven photoemission and recollision at a solid surface: laser-triggered metallic nanotips. In addition to the research questions of rather fundamental nature, femtosecond electron sources with outstanding beam qualities have resulted from this research, which has prompted follow-up application in the sensing of electric fields and lightwave electronics, ultrafast microscopy and diffraction, and fundamental matter-wave quantum optics. We review the theoretical and experimental concepts underlying near-field enhancement, photoemission regimes and electron acceleration mechanisms. Nanotips add new degrees of freedom to well known strong-field phenomena from atomic physics. For example, they enable the realization of a true sub-optical-cycle acceleration regime where recollision is suppressed. We also discuss the possibility of high-harmonic generation due to laser irradiation of metallic nanostructures.

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“…The plasmonic nanoparticle structures with a high-LFEF resonance and also suppressed loss would be highly beneficial to many applications that require a sharp resonant response and an intense enhancement of light-matter interaction. Generally, the SP nano-focusing not only relies on the interaction of the surface resonant waves excited and the patterned micro-nano-structures constructed, but also is defined as a transmission phenomenon 11 – 14 . Thus, the upright optical nano-antenna array is proposed compared to the common planar nano-antenna 15 .…”

Section: Introductionmentioning

confidence: 99%

Lightwave nano-converging enhancement by an arrayed optical antenna based on metallic nano-cone-tips for CMOS imaging detection

Liu

et al. 2022

Sci Rep

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A kind of gold-coated glass nano-cone-tips (GGNCTs) is developed as an arrayed optical antenna for highly receiving and converging incident lightwaves. A local light field enhancement factor (LFEF) of ~ 2 × 104 and maximum light absorption of ~ 98% can be achieved. The near-field lightwave measurements at the wavelength of 633 nm show that the surface net charges over a single GGNCT make a typical dipole oscillation and the energy transmits along the wave vector orientation, thus leading to a strong local light field enhancement. An effective detection method by near-field coupling an arrayed GGNCT and complementary metal–oxide–semiconductor (CMOS) sensor for highly efficient imaging detection is proposed. The lightwave detection at several wavelengths, including typical 473 nm, 532 nm, 671 nm, and 980 nm, shows a notable characteristic that a better capability of the net charge distribution adjusting and localized aggregating can be obtained at the absorption peak of the GGNCT developed and a stronger signal detection achieved. The research lays a foundation for further developing a light detector with an ideal optoelectronic sensitivity and broad spectral suitability, which is based on integrating GGNCTs as an arrayed optical antenna with common sensors.

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Optimization of a nanotip on a surface for the ultrafast probing of propagating surface plasmons

Cited by 8 publications

References 51 publications

Attosecond-controlled photoemission from metal nanowire tips in the few-electron regime

Attosecond-controlled photoemission from metal nanowire tips in the few-electron regime

Attosecond physics phenomena at nanometric tips

Lightwave nano-converging enhancement by an arrayed optical antenna based on metallic nano-cone-tips for CMOS imaging detection

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