Spectral control of high harmonics from relativistic plasmas using bicircular fields

Chen, Zi-Yu

doi:10.1103/physreve.97.043202

Cited by 25 publications

(18 citation statements)

References 44 publications

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“…An essential feature is that only the harmonic orders of n = 6m ± 1 (m = 1, 2, 3, · · · ) are present, while other harmonic orders are all suppressed. This interesting feature looks similar to the cases of HHG driven by two-color counter-rotating circularly polarized laser fields from gases [4,52,53] or plasmas [54], where spectral selection rules of n = 3m ± 1 can be deduced from simple arguments based on three-fold symmetry and conservation laws for energy, parity, and spin angular momentum [4,19,[52][53][54]. The situation is different here, since a single circularly polarized driver is used.…”

Section: Resultssupporting

confidence: 56%

“…This is also true for the 5th and 7th harmonics. It also can be seen that the alternative harmonic orders exhibit opposite helicity, similar to the case of HHG driven by bicircular fields [4,54]. Generation of circularly polarized high harmonics extending to the XUV spectral region by a single-color laser pulse in 2D materials may open a door for developing novel ultra-compact photonic devices and new spectroscopy and imaging techniques for investigating chirality-phenomena at nanoscale.…”

Section: Resultsmentioning

confidence: 81%

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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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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 81%

Circularly polarized extreme ultraviolet high harmonic generation in graphene

Chen¹,

Qin²

2019

Opt. Express

Self Cite

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“…As a table-top and alternative to large-scale instruments, high-harmonic generation (HHG) based on the frequency up-conversion has attracted an increasing attention. This nonlinear process includes laser-gas HHG [4,5] and laser-plasma HHG [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. These two HHG mechanisms are fundamentally different, and the intensity of emitted harmonics in the latter case can be increased by several orders of magnitude compared with that of the former, in which the limitations of the driving laser intensity (often below 10 15−16 W/cm 2 ) exist to avoid strong ionization.…”

Section: Introductionmentioning

confidence: 99%

High-order vortex harmonics generation by bi-circular Laguerre-Gaussian laser fields with relativistic plasmas

Xie

Yin

et al. 2022

Front. Phys.

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Vortex beams with ultra-high brilliance can greatly enrich the light and matter interaction process and even shed light on the unexpected information in relativistic nonlinear optics. Thus, we propose a scheme for relativistic intense vortex harmonic radiation by use of bi-circular Laguerre–Gaussian lasers irradiating relativistic plasmas. Three-dimensional particle-in-cell simulation results show that the emitted harmonics own controllable spin and orbital angular momentum simultaneously, which can be attributed to the vortex mirror model and the related conservation laws. Meanwhile, the conversion efficiency of harmonic generation can be tuned through adjusting the intensity ratio of the two driving field components.

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“…Subsequently, CP harmonic generation from a relativistic plasma mirror was studied by Chen et al [41] and Ma et al [42] using an obliquely incident CP pulse. The idea of mixing bi-chromatic pulses as proposed in gas harmonic generation has also been explored numerically for overdense plasmas at ultrarelativistic laser intensities [43] and analytically for underdense plasmas and more moderate laser amplitudes [44].…”

Section: Introductionmentioning

confidence: 99%

Theory of circularly polarized harmonic generation using bi-colour lasers in underdense plasmas

Chitgar

Adam

Greb

et al. 2021

Plasma Phys. Control. Fusion

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Circularly polarized (CP) extreme ultraviolet-and x-ray radiation is an essential tool for analyzing the magnetic properties of materials. Elliptically polarized high harmonic generation (HHG) has been demonstrated by focusing bi-chromatic (800 + 400 nm wavelengths), counter-rotating CP laser pulses into gas targets (Fleischer et al 2014 Nat. Photonics 8 543). More recent theoretical studies indicate that a bi-circular laser driver can also work in both under-and overdense plasmas with analogous selection rules to those in gases: for example, every third harmonic is suppressed and adjacent harmonics have opposite helicity for counter-polarized CP ω 0 and 2ω 0 pumps. In this work, an analytical theory of bi-circular HHG from underdense plasmas is formulated which provides quantitative predictions of harmonic efficiency scaling, selectivity and helicity for both co-and counter-polarized drivers of arbitrary frequency ratio. This is compared to a fully non-linear, one-dimensional fluid model and particle-in-cell simulations, showing good agreement with both.

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Spectral control of high harmonics from relativistic plasmas using bicircular fields

Cited by 25 publications

References 44 publications

Circularly polarized extreme ultraviolet high harmonic generation in graphene

Circularly polarized extreme ultraviolet high harmonic generation in graphene

High-order vortex harmonics generation by bi-circular Laguerre-Gaussian laser fields with relativistic plasmas

Theory of circularly polarized harmonic generation using bi-colour lasers in underdense plasmas

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