Observation of Magnetic Helicoidal Dichroism with Extreme Ultraviolet Light Vortices

Fanciulli, Mauro; Pancaldi, Matteo; Pedersoli, Emanuele; Vimal, Mekha; Bresteau, David; Luttmann, Martin; Angelis, Dario De; Ribič, Primož Rebernik; Rösner, Benedikt; Dávid, Christian; Spezzani, C.; Manfredda, Michele; Sousa, R. C.; Prejbeanu, Ioan-Lucian; Vila, Laurent; Diény, B.; Ninno, G. De; Capotondi, Flavio; Sacchi, M.; Ruchon, Thierry

doi:10.1103/physrevlett.128.077401

Cited by 31 publications

(28 citation statements)

References 59 publications

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“…The central phase singularity results in a donut-like intensity profile with a null on-axis intensity. Optical vortex beams have proven their utility for a wide range of applications, including optical trapping and tweezing, , super-resolution microscopy, , optical communication, , and quantum information. , Moreover, with the demonstration of OAM transfer to bound, free electrons and the observation of magnetic helicoidal dichroism, optical vortex beams have brought light–matter interactions to a novel regime.…”

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confidence: 99%

Characterization of Extreme Ultraviolet Vortex Beams with a Very High Topological Charge

et al. 2022

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Recent developments of high harmonic generation (HHG) have enabled the production of structured extreme-ultraviolet (EUV) ultrafast laser beams with orbital angular momentum (OAM). Precise manipulation and characterization of their spatial structure are paramount for their application in state-of-the-art ultrafast studies. In this work, we report the generation and characterization of EUV vortex beams bearing a topological charge as high as 100. Thanks to OAM conservation, HHG in noble gases offers a unique opportunity to generate ultrafast harmonic beams with a high topological charge from low charge infrared vortex beams. A high-resolution Hartmann wavefront sensor allows us to perform a complete spatial characterization of the amplitude and phase of the 25th harmonic beam (32.6 nm), revealing very high-topological charges in the EUV spectral regime. Our experimental results, supported by numerical HHG simulations, demonstrate the linear upscaling of the OAM of the high-order harmonics with that of low-charge driving vortex beams, showing the sensitiveness of the OAM content to the purity of the driving beam. The generation of structured EUV beams carrying large topological charges brings in the promising scenario of OAM transfer from light to matter at both macroscopic and microscopic scales.

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confidence: 99%

Characterization of Extreme Ultraviolet Vortex Beams with a Very High Topological Charge

et al. 2022

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“…Second, in comparison to simpler structures, such as gratings, the spiral masks feature beam structuring in various directions. Third, the generation of twisted beams with a table-top source could open up new avenues toward OAM-induced magnetic dichroism microscopy, as recently demonstrated at a free-electron laser 39 . In this experiment, a charge 3 orbital angular momentum (OAM) was created.…”

Section: Resultsmentioning

confidence: 99%

Material-specific high-resolution table-top extreme ultraviolet microscopy

et al. 2022

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Microscopy with extreme ultraviolet (EUV) radiation holds promise for high-resolution imaging with excellent material contrast, due to the short wavelength and numerous element-specific absorption edges available in this spectral range. At the same time, EUV radiation has significantly larger penetration depths than electrons. It thus enables a nano-scale view into complex three-dimensional structures that are important for material science, semiconductor metrology, and next-generation nano-devices. Here, we present high-resolution and material-specific microscopy at 13.5 nm wavelength. We combine a highly stable, high photon-flux, table-top EUV source with an interferometrically stabilized ptychography setup. By utilizing structured EUV illumination, we overcome the limitations of conventional EUV focusing optics and demonstrate high-resolution microscopy at a half-pitch lateral resolution of 16 nm. Moreover, we propose mixed-state orthogonal probe relaxation ptychography, enabling robust phase-contrast imaging over wide fields of view and long acquisition times. In this way, the complex transmission of an integrated circuit is precisely reconstructed, allowing for the classification of the material composition of mesoscopic semiconductor systems.

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“…Structured light beams have enabled numerous interdisciplinary applications [1,2,4]. In particular, structured light has opened new frontiers in light-matter interactions: photonic induction and control of ultrafast currents in semiconductors, thus opening the possibilities of reconfigurable optoelectronic circuits [7,8], OAM transfer to valence electrons [9], photoelectrons [10], observation of magnetic helicoidal dichroism [11], and selective excitation of multipolar modes in localized surface plasmons [12], to name a few. Given the plenitude of applications, controlled generation and manipulation of light beams exhibiting OAM, SAM, or both in the short-wavelength regime are particularly relevant as they can allow extending their applications to nanometric spatial and subfemtosecond temporal scales [13].…”

Section: Introductionmentioning

confidence: 99%

Extreme-ultraviolet structured beams via high harmonic generation

Pandey¹,

Heras²,

Román³

et al. 2022

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Vigorous efforts to harness the topological properties of light have enabled a multitude of novel applications. Translating the applications of structured light to higher spatial and temporal resolutions mandates their controlled generation, manipulation, and thorough characterization in the short-wavelength regime. Here, we resort to high-order harmonic generation (HHG) in a noble gas to upconvert nearinfrared (IR) vector, vortex, and vector-vortex driving beams that are tailored respectively in their Spin Angular Momentum (SAM), Orbital Angular Momentum (OAM), and simultaneously in their SAM and OAM. We show that HHG enables the controlled generation of extreme-ultraviolet (EUV) vector beams exhibiting various spatially-dependent polarization distributions, or EUV vortex beams with a highly twisted phase. Moreover, we demonstrate the generation of EUV vector-vortex beams (VVB) bearing combined characteristics of vector and vortex beams. We rely on EUV wavefront sensing to unambiguously affirm the topological charge scaling of the HHG beams with the harmonic order. Interestingly, our work shows that HHG allows for a synchronous controlled manipulation of SAM and OAM. These EUV structured beams bring in the promising scenario of their applications at nanometric spatial and sub-femtosecond temporal resolutions using a table-top harmonic source.

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Observation of Magnetic Helicoidal Dichroism with Extreme Ultraviolet Light Vortices

Cited by 31 publications

References 59 publications

Characterization of Extreme Ultraviolet Vortex Beams with a Very High Topological Charge

Characterization of Extreme Ultraviolet Vortex Beams with a Very High Topological Charge

Material-specific high-resolution table-top extreme ultraviolet microscopy

Extreme-ultraviolet structured beams via high harmonic generation

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