High-harmonic generation by field enhanced femtosecond pulses in metal-sapphire nanostructure

Han, Seunghwoi; Kim, Hyun-Woong; Kim, Young Kook; Kim, Young‐Jin; Kim, Seungchul; Park, In-Yong; Kim, Seung-Woo

doi:10.1038/ncomms13105

Cited by 176 publications

(111 citation statements)

References 45 publications

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“…Measured XUV spectra show odd-order harmonics up to 60 nm wavelengths without the plasma atomic lines typically seen when using gaseous atoms as the HHG emitter. This experimental outcome confirms that the plasmonic HHG approach is a promising way to realize coherent XUV sources for nano-scale near-field applications in spectroscopy, microscopy, lithography, and attosecond physics [140]. The era of the atto-nanophysics…”

Section: Conclusion Outlook and Perspectivessupporting

confidence: 70%

21st Century Nanoscience – A Handbook

Sattler

2019

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Two emerging areas of research, attosecond and nanoscale physics, have recently started to merge. Attosecond physics deals with phenomena occurring when ultrashort laser pulses, with duration on the femto-and sub-femtosecond time scales, interact with atoms, molecules or solids. The laserinduced electron dynamics occurs natively on a timescale down to a few hundred or even tens of attoseconds (1 attosecond=1 as=10 −18 s), which is of the order of the optical field cycle. For comparison, the revolution of an electron on a 1s orbital of a hydrogen atom is ∼ 152 as. On the other hand, the second topic involves the manipulation and engineering of mesoscopic systems, such as solids, metals and dielectrics, with nanometric precision. Although nano-engineering is a vast and well-established research field on its own, the combination with intense laser physics is relatively recent. We present a comprehensive theoretical overview of the tools to tackle and understand the physics that takes place when short and intense laser pulses interact with nanosystems, such as metallic and dielectric nanostructures. In particular we elucidate how the spatially inhomogeneous laser induced fields at a nanometer scale modify the laser-driven electron dynamics. Consequently, this has important impact on pivotal processes such as above-threshold ionization and high-order harmonic generation. The deep understanding of the coupled dynamics between these spatially inhomogeneous fields and matter configures a promising way to new avenues of research and applications. Thanks to the maturity that attosecond physics has reached, together with the tremendous advance in material engineering and manipulation techniques, the age of atto-nano physics has begun, but it is still in an incipient stage.

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Section: Conclusion Outlook and Perspectivessupporting

confidence: 70%

21st Century Nanoscience – A Handbook

Sattler

2019

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“…Hence, generating plasmon-assisted high harmonics within a crystalline substrate should overcome the limit of previous experiments (that is, the need to increase the number of emitters), and improve the longevity of the nanostructures to highpower irradiation (the longevity depends on their structural quality). These advantages have been exploited in a recent experiment conducted on Au-coated sapphire nano-cones 17 , where the surface plasmon is adiabatically excited-rather than resonantly excited as in this letter. Figure 1a shows a sketch of the experimental setup (see also Supplementary Information).…”

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confidence: 99%

Plasmon-enhanced high-harmonic generation from silicon

et al. 2017

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Plasmonic antennas can enhance the intensity of a nanojoule laser pulse by localizing the electric field in their proximity 1 . It has been proposed that the field can become strong enough to convert the fundamental laser frequency into high-order harmonics through an extremely nonlinear interaction with gas atoms that occupy the nanoscopic volume surrounding the antennas [2][3][4] . However, the small number of gas atoms that can occupy this volume limits the generation of high harmonics [5][6][7] . Here we use an array of monopole nano-antennas to demonstrate plasmon-assisted high-harmonic generation directly from the supporting crystalline silicon substrate. The high density of the substrate compared with a gas allows macroscopic buildup of harmonic emission. Despite the sparse coverage of antennas on the surface, harmonic emission is ten times brighter than without antennas. Imaging the high-harmonic radiation will allow nanometre and attosecond measurement of the plasmonic field 8 thereby enabling more sensitive plasmon sensors 9 while opening a new path to extreme-ultraviolet-frequency combs 10

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“…Our results are in agreement with the recent plasmonic enhanced high harmonic generation from a crystalline material. 28,35 We do not observe a significant enhancement of the THG emission from the bare Au itself, which is ascribed to the strong absorption by Au atoms. It will be promising to use mid-infrared femtosecond sources to further investigate the ability of bare Au for THG enhancement because in the long wavelength region, the band-to-band transition is not as significant as in the case of a near-infrared driver.…”

Section: (A) and 2(b)]mentioning

confidence: 82%

“…The Au interconnector shifts the field enhancement area to be far away from the substrate. 28 There is no field enhancement in the substrate of the gap region [left inset, Fig. 2(d)].…”

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confidence: 99%

Investigating the origin of third harmonic generation from diabolo optical antennas

Shi

Andrade

Kim

et al. 2017

Applied Physics Letters

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We propose to use diabolo nanoantennas for experimentally investigating the origin of the enhanced third harmonic generation by localized surface plasmon polaritons. In such a geometry, the opposing apexes of bowties are electrically connected by a thin gold nanorod, which has two important functions in discriminating the point of harmonic generation. First, the inserted gold nanorod shifts the field enhancement area to be far away from the dielectric substrate material. Next, the accumulation of free charges at the adjacent bowtie tips produces a strong electric field inside the gold nanorod. The diabolo nanoantennas allow us to examine the contribution of the bare gold susceptibility to the third harmonic conversion. Our results reveal that the bare gold does not significantly enhance the harmonic generation at high pump intensity. From this, we deduce that in regular bowtie antennas, the enhanced harmonic photons mainly arise from the substrate sapphire that is located in the feedgap of the bowtie, where the electric near-field is significantly enhanced by the localized surface plasmons. Published by AIP Publishing. https://doi

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High-harmonic generation by field enhanced femtosecond pulses in metal-sapphire nanostructure

Cited by 176 publications

References 45 publications

21st Century Nanoscience – A Handbook

21st Century Nanoscience – A Handbook

Plasmon-enhanced high-harmonic generation from silicon

Investigating the origin of third harmonic generation from diabolo optical antennas

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