Scanless laser waveform measurement in the near-infrared

APL Photonics, Год журнала: 2025, Номер 10(1)

Опубликована: Янв. 1, 2025

Field-resolved measurements of few-cycle laser waveforms allow access to ultrafast electron dynamics in light–matter interactions and are key future lightwave electronics. Recently, sub-cycle gating based on nonlinear excitation active pixel sensors has allowed the first single-shot mid-infrared optical fields. Extending techniques shorter wavelengths, however, is not feasible using silicon-based detectors with bandgaps near-infrared. Here, we demonstrate an all-optical sampling technique for near-infrared fields, wherein intense fundamental field generates a gate through wide-bandgap crystal, this case, ZnO, which can sample electric weak perturbing pulse. By crossed-beam geometry, temporal evolution mapped onto transverse spatial axis medium, waveform captured single measurement spatially resolved fluorescence emission from crystal. The demonstrated field-resolved reshaping during propagation ZnO detection

Язык: Английский

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Time-domain study of coupled collective excitations in quantum materials

npj Quantum Materials, Год журнала: 2025, Номер 10(1)

Опубликована: Фев. 14, 2025

Язык: Английский

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Elegant high-order harmonic vortices generation

Applied Physics Letters, Год журнала: 2025, Номер 126(8)

Опубликована: Фев. 24, 2025

High-order harmonic generation is a cornerstone of attosecond science, with applications spanning from spectroscopy to the creation ultrashort light pulses temporal duration falling in regime. In addition, beams carrying orbital angular momentum (OAM) allow studies light–matter interactions mediated by OAM couplings. this work, we present an alternative approach generating high-order vortices using elegant Laguerre–Gaussian (eLG) beams. We examine spatiotemporal characteristics these far-field regime and demonstrate how low divergence eLG makes them suitable for producing extreme ultraviolet (XUV) twisted pulses. Additionally, solving Fraunhofer integral, analyze influence azimuthal radial indices on spatial profile vortex beams, thereby exploring impact larger topological charges. This study extends concept generated beyond paraxial approximation.

Язык: Английский

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Half-cycle dissipative solitons in a multilevel resonant medium

Physical review. A/Physical review, A, Год журнала: 2025, Номер 111(1)

Опубликована: Янв. 22, 2025

Язык: Английский

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Attosecond physics and technology

Applied Physics Letters, Год журнала: 2025, Номер 126(17)

Опубликована: Апрель 28, 2025

In this Perspective, we provide an overview of the field attosecond physics and technology for which 2023 Nobel Prize in Physics was awarded to Pierre Agostini, Ferenc Krausz, Anne L'Huillier. We look at current state-of-the-art timescale measurements recent advances enabled by light driven inspired earlier work field. end Perspective with some comments on exciting future directions now developing

Язык: Английский

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Light-induced quantum tunnelling current in graphene

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Май 9, 2025

Abstract In the last decade, advancements in attosecond spectroscopy have allowed researchers to study and manipulate electron dynamics condensed matter via ultrafast light fields, offering possibility realise optoelectronic devices. Here, we report generation of light-induced quantum tunnelling currents graphene phototransistors by laser pulses an ambient environment. This effect provides access instantaneous field-driven current, demonstrating a current switching (ON OFF) on ~630 scale (~1.6 petahertz speed). We show tunability enhancement phototransistor conductivity controlling density photoexcited charge carriers at different pump powers. exploited this capability demonstrate various logic gates. The reported approach under conditions is suitable for development optical transistors, lightwave electronics, computers.

Язык: Английский

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Attosecond diffraction imaging of electron dynamics in solids

Physical Review Research, Год журнала: 2025, Номер 7(2)

Опубликована: Май 27, 2025

Visualizing the electron dynamics in four dimensions of space and time is crucial to understanding several ubiquitous processes nature. Hence, ultrafast x-ray imaging tools have been developed probe matter by means time-resolved diffraction (TRDI). In this work, we report an extension theory underlying TRDI case laser-driven solid-state systems. We demonstrate that signal encodes essential information about time-dependent density system under study thus makes it possible decipher quantum transfer phenomena solids. apply approach image neutral graphene showing predictions made fully version deviate significantly from those obtained with conventional semiclassical approach. Published American Physical Society 2025

Язык: Английский

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High-repetition-rate ultrafast electron diffraction with direct electron detection

Structural Dynamics, Год журнала: 2024, Номер 11(5)

Опубликована: Июль 1, 2024

Ultrafast electron diffraction (UED) instruments typically operate at kHz or lower repetition rates and rely on indirect detection of electrons. However, these experiments encounter limitations because they are required to use beams containing a relatively large number electrons (≫100 electrons/pulse), leading severe space-charge effects. Consequently, pulses with long durations transverse diameters used interrogate the sample. Here, we introduce novel UED instrument operating high rate employing direct detection. We significantly below regime by using 1–140 per pulse 30 kHz. demonstrate ability detect time-resolved signals from thin film solid samples difference contrast signal, ΔI/I0, an response function as low 10−5 184-fs (FWHM), respectively, without temporal compression. Overall, our findings underscore importance increasing adopting scheme, which will be particularly impactful for gas-phase UED. Our newly developed scheme enables more efficient sensitive investigations ultrafast dynamics in photoexcited ultrashort beams.

Язык: Английский

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Light-induced quantum tunnelling current in graphene

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Авг. 28, 2024

In the last decade, advancements in attosecond spectroscopy have allowed us to study electron motion dynamics condensed matter. The access these and, consequently, its control by an ultrafast light field paves way for establishing optoelectronics. Here, we report generation of light-induced quantum tunnelling current graphene phototransistors laser pulses ambient environment. This effect provides instantaneous field-driven demonstrate switching (ON and OFF) on a 630 (~1.6 petahertz speed). Moreover, controlled enhanced phototransistor conductivity controlling density photoexcited charge carriers at different pump powers. Furthermore, exploited this capability various logic gates. demonstrated were attained under standard room temperature pressure conditions. Therefore, presented scientific advancement work is technology readiness level suitable immediate integration into development ultrafast—nearly six orders magnitude faster—optical transistors, lightwave electronics, optical computers.

Язык: Английский

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Elektronendynamiksimulation mit Wellenfunktionen für Materialanwendungen/Trendbericht Theoretische Chemie 2024 (1/3)

Nachrichten aus der Chemie, Год журнала: 2024, Номер 72(11), С. 48 - 52

Опубликована: Окт. 31, 2024

Abstract Zeitabhängige Simulationen der Elektronendynamik gewinnen für optische Materialien und lichtinduzierte Photoreaktionen an Gewicht. Verständliche visuelle Ergebnisdarstellungen moderne effiziente Rechenverfahren helfen dabei, die Technik zu verbreiten. Renaissance Semiempirik: In jüngerer Zeit tragen semiempirische Methoden wieder vermehrt dazu bei, Vorhersagekraft quantenchemischer steigern. Dichtefunktionaltheorie: Auf Suche nach einem universellen Austauschkorrelationsfunktional sind mathematisch flexible Ansätze Hybridfunktionale besonders vielversprechend, etwa lokale oder mit lokaler Reichweitenseparierung.

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