Polarization control of isolated high-harmonic pulses

Huang, Po-Yuan; Hernández-García, Carlos; Huang, Jiayi; Huang, Po-Yao; Lu, Chih‐Hsuan; Rego, Laura; Hickstein, Daniel D.; Ellis, Jennifer L.; Jaroń-Becker, Agnieszka; Yang, Shiaw‐Der; Durfee, Charles G.; Plaja, Luis; Kapteyn, Henry C.; Murnane, Margaret M.; Kung, A. H.; Chen, Ming-Chang

doi:10.1038/s41566-018-0145-0

Cited by 164 publications

(73 citation statements)

References 50 publications

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“…(so e.g. j (13) γ =26 3 and j (14) γ = 28 3 ) and, following the definition of the TKAM, its OAM would be q = j (q) γ − γS q = (2q ± 1)/3 for right-(+) and left-(−) polarized harmonics (therefore giving 13 = 14 = 9, in agreement with the results of Refs. 41, 50).…”

supporting

confidence: 87%

“…HHG is a nonperturbative phenomenon which is best understood using a semiclassical picture: an ionized electron is accelerated back to its parent ion, emitting high-frequency light in the ensuing recollision [9][10][11]. Despite the lack of a photonexchange model, HHG is often regarded as a parametric process, and its conservation properties have been explored extensively as regards energy [12], linear momentum [13], and orbital and spin angular momentum (SAM) [14][15][16][17][18][19][20][21][22][23][24][25][26].…”

mentioning

confidence: 99%

“…One particularly relevant example is the three-foldsymmetric trefoil field present in the 'bicircular' HHG configurations [22][23][24][25][26][34][35][36][37][38][39][40][41] used to produce circularlypolarized harmonics. This field consists of two counterrotating circularly-polarized drivers at different frequencies, and exhibits the same configuration after a polarization rotation by an angle 2π/n, with n ≥ 3.…”

mentioning

confidence: 99%

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Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

et al. 2019

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High-order harmonic generation stands as a unique nonlinear optical up-conversion process, mediated by a laser-driven electron recollision mechanism, which has been shown to conserve energy, momentum, and spin and orbital angular momentum. Here we present theoretical simulations which demonstrate that this process also conserves a mixture of the latter, the torus-knot angular momentum Jγ, by producing high-order harmonics with driving pulses that are invariant under coordinated rotations. We demonstrate that the charge Jγ of the emitted harmonics scales linearly with the harmonic order, and that this conservation law is imprinted onto the polarization distribution of the emitted spiral of attosecond pulses. We also demonstrate how the nonperturbative physics of high-order harmonic generation affect the torus-knot angular momentum of the harmonics, and we show that this configuration harnesses the spin selection rules to channel the full yield of each harmonic into a single mode of controllable orbital angular momentum.

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confidence: 87%

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confidence: 99%

mentioning

confidence: 99%

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Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

et al. 2019

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“…In the past few years, intensive efforts have been made towards circularly polarized HHG. Use of two counter-rotating circularly polarized laser fields has lead to the breakthrough of circularly polarized high harmonic [3][4][5] and isolated attosceond pulse [6] generation experimentally. Later, it was numerically demonstrated that circularly polarized XUV and attosceond pulses can also be generated via HHG from relativistic plasma surfaces [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Circularly polarized extreme ultraviolet high harmonic generation in graphene

Chen¹,

Qin²

2019

Opt. Express

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Circularly polarized extreme ultraviolet (XUV) radiation is highly interesting for investigation of chirality-sensitive light-matter interactions. Recent breakthroughs have enabled generation of such light sources via high harmonic generation (HHG) from rare gases. There is a growing interest in extending HHG medium from gases to solids, especially to 2D materials, as they hold great promise to develop ultra-compact solid-state photonic devices and provide insights into electronic properties of the materials themselves. However, HHG in graphene driven by terahertz to mid-infrared fields reported so far only generate low harmonic orders, and furthermore no harmonics driven by circularly polarized lasers. Here, using first-principles simulations within a time-dependent density-functional theory framework, we show that it is possible to generate HHG extending to the XUV spectral region in monolayer extended graphene excited by near-infrared lasers. Moreover, we demonstrate that a single circularly polarized driver is enough to ensure HHG in graphene with circular polarization. The corresponding spectra reflect the six-fold rotational symmetry of the graphene crystal. Extending HHG in graphene to the XUV spectral regime and realizing circular polarization represent an important step towards the development of novel nanoscale attosecond photonic devices and numerous applications such as spectroscopic investigation and nanoscale imaging of ultrafast chiral and spin dynamics in graphene and other 2D materials.

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“…(The same configuration was explored in fact 20 years earlier [128], but the experimental work emphasized the generation, rather than the polarization state, of the emission.) More recently, a number of different methods for generating APTs, as well as isolated attosecond pulses, of circular polarization have been demonstrated [129][130][131][132]. Using tomographic reconstruction in polarization-dependent surface photoemission, the polarization state of these APTs can be reconstructed and compared with theory ( figure 9).…”

Section: (E) Control Of Spectrum and Polarizationmentioning

confidence: 99%

Recent advances in ultrafast X-ray sources

Schoenlein

Elsaesser

Holldack

et al. 2019

Phil. Trans. R. Soc. A.

120

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Over more than a century, X-rays have transformed our understanding of the fundamental structure of matter and have been an indispensable tool for chemistry, physics, biology, materials science and related fields. Recent advances in ultrafast X-ray sources operating in the femtosecond to attosecond regimes have opened an important new frontier in X-ray science. These advances now enable: (i) sensitive probing of structural dynamics in matter on the fundamental timescales of atomic motion, (ii) element-specific probing of electronic structure and charge dynamics on fundamental timescales of electronic motion, and (iii) powerful new approaches for unravelling the coupling between electronic and atomic structural dynamics that underpin the properties and function of matter. Most notable is the recent realization of X-ray free-electron lasers (XFELs) with numerous new XFEL facilities in operation or under development worldwide. Advances in XFELs are complemented by advances in synchrotron-based and table-top laser-plasma X-ray sources now operating in the femtosecond regime, and laser-based high-order harmonic XUV sources operating in the attosecond regime. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

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Polarization control of isolated high-harmonic pulses

Cited by 164 publications

References 50 publications

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

Circularly polarized extreme ultraviolet high harmonic generation in graphene

Recent advances in ultrafast X-ray sources

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