Publications
21 results found
Garratt D, Matthews M, Marangos J, 2024, Towards ultrafast soft X-ray spectroscopy of organic photovoltaic devices, Structural Dynamics, Vol: 11, ISSN: 2329-7778
Novel ultrafast x-ray sources based on high harmonic generation and at x-ray free electron lasers are opening up new opportunities to resolve complex ultrafast processes in condensed phase systems with exceptional temporal resolution and atomic site specificity. In this perspective, we present techniques for resolving charge localization, transfer, and separation processes in organic semiconductors and organic photovoltaic devices with time-resolved soft x-ray spectroscopy. We review recent results in ultrafast soft x-ray spectroscopy of these systems and discuss routes to overcome the technical challenges in performing time-resolved x-ray experiments on photosensitive materials with poor thermal conductivity and low pump intensity thresholds for nonlinear effects.
Alexander O, Barnard J, Larsen E, et al., 2023, Observation of recollision-based high-harmonic generation in liquid isopropanol and the role of electron scattering, Physical Review Research, ISSN: 2643-1564
Patas A, Matthews M, Hermelin S, et al., 2018, Modifications of filament spectra by shaped octave-spanning laser pulses, PHYSICAL REVIEW A, Vol: 98, ISSN: 2469-9926
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- Citations: 1
Gateau J, Patas A, Matthews M, et al., 2018, Maximizing energy deposition by shaping few-cycle laser pulses, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 51, ISSN: 0953-4075
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- Citations: 4
Matthews M, Bredtmann T, Patas A, et al., 2018, Amplification of intense light fields by 'bound states of free electrons, Nature Physics, Vol: 14, Pages: 695-700, ISSN: 1745-2473
Light can be used to modify and control properties of media, as in the case of electromagnetically induced transparency or, more recently, for the generation of slow light or bright coherent extreme ultraviolet and X-ray radiation. Particularly unusual states of matter can be created by light fields with strengths comparable to the Coulomb field that binds valence electrons in atoms, leading to nearly free electrons oscillating in the laser field and yet still loosely bound to the core1,2. These are known as Kramers–Henneberger states3, a specific example of laser-dressed states2. Here, we demonstrate that these states arise not only in isolated atoms4,5, but also in rare gases, at and above atmospheric pressure, where they can act as a gain medium during laser filamentation. Using shaped laser pulses, gain in these states is achieved within just a few cycles of the guided field. The corresponding lasing emission is a signature of population inversion in these states and of their stability against ionization. Our work demonstrates that these unusual states of neutral atoms can be exploited to create a general ultrafast gain mechanism during laser filamentation.
Matthews M, Morales F, Patas A, et al., 2018, Amplification of intense light fields by nearly free electrons (vol 14, pg 695, 2018), NATURE PHYSICS, Vol: 14, Pages: 767-767, ISSN: 1745-2473
Schmidt C, Pertot Y, Balciunas T, et al., 2018, High-order harmonic source spanning up to the oxygen K-edge based on filamentation pulse compression, Optics Express, Vol: 26, Pages: 11834-11842, ISSN: 1094-4087
We present a 0.2 TW sub-two-cycle 1.8 µm carrier-envelope-phase stable source based on two-stage pulse compression by filamentation for driving high-order harmonic generation extending beyond the oxygen K absorption edge. The 1 kHz repetition rate, high temporal resolution enabled by the short 11.8 fs driving pulse duration, and bright high-order harmonics generated in helium make this an attractive source for solid-state and molecular-dynamics studies.
Crassee I, Gallmann L, Gaumann G, et al., 2017, Strong field transient manipulation of electronic states and bands, STRUCTURAL DYNAMICS-US, Vol: 4, ISSN: 2329-7778
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- Citations: 4
Pertot Y, Schmidt C, Matthews M, et al., 2017, Time-resolved x-ray absorption spectroscopy with a water window high-harmonic source, Science, Vol: 355, Pages: 264-+, ISSN: 0036-8075
Time-resolved x-ray absorption spectroscopy (TR-XAS) has so far practically been limited to large-scale facilities, to subpicosecond temporal resolution, and to the condensed phase. We report the realization of TR-XAS with a temporal resolution in the low femtosecond range by developing a tabletop high-harmonic source reaching up to 350 electron volts, thus partially covering the spectral region of 280 to 530 electron volts, where water is transmissive. We used this source to follow previously unexamined light-induced chemical reactions in the lowest electronic states of isolated CF4+ and SF6+ molecules in the gas phase. By probing element-specific core-to-valence transitions at the carbon K-edge or the sulfur L-edges, we characterized their reaction paths and observed the effect of symmetry breaking through the splitting of absorption bands and Rydberg-valence mixing induced by the geometry changes.
Pertot Y, Schmidt C, Matthews M, et al., 2017, Time-resolved X-ray absorption spectroscopy with a water-window high-harmonic source, Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
Schubert E, Brisset J-G, Matthews M, et al., 2016, Optimal laser-pulse energy partitioning for air ionization, PHYSICAL REVIEW A, Vol: 94, ISSN: 2469-9926
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- Citations: 11
Matthews M, Pomel F, Wender C, et al., 2016, Laser vaporization of cirrus-like ice particles with secondary ice multiplication, Science Advances, Vol: 2, ISSN: 2375-2548
We investigate the interaction of ultrashort laser filaments with individual 90-μm ice particles, representative of cirrus particles. The ice particles fragment under laser illumination. By monitoring the evolution of the corresponding ice/vapor system at up to 140,000 frames per second over 30 ms, we conclude that a shockwave vaporization supersaturates the neighboring region relative to ice, allowing the nucleation and growth of new ice particles, supported by laser-induced plasma photochemistry. This process constitutes the first direct observation of filament-induced secondary ice multiplication, a process that strongly modifies the particle size distribution and, thus, the albedo of typical cirrus clouds.
Mongin D, Schubert E, Matthews M, et al., 2015, Laser-induced condensation in the atmosphere: Mechanism and optimization, 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), Publisher: IEEE
Murphy FJ, Bak AO, Matthews M, et al., 2014, Linewidth-narrowing phenomena with intersubband cavity polaritons, PHYSICAL REVIEW B, Vol: 89, ISSN: 1098-0121
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- Citations: 6
Petrarca M, Henin S, Berti N, et al., 2014, White-light femtosecond Lidar at 100 TW power level, APPLIED PHYSICS B-LASERS AND OPTICS, Vol: 114, Pages: 319-325, ISSN: 0946-2171
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- Citations: 21
Matthews M, Henin S, Pomel F, et al., 2013, Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation, APPLIED PHYSICS LETTERS, Vol: 103, ISSN: 0003-6951
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- Citations: 10
Amrania H, McCrow AP, Matthews MR, et al., 2011, Ultrafast infrared chemical imaging of live cells, CHEMICAL SCIENCE, Vol: 2, Pages: 107-111, ISSN: 2041-6520
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- Citations: 22
Steed RJ, Frogley MD, Matthews M, et al., 2008, Angular momentum kinetics in intersubband transitions in semiconductor quantum wells, PHYSICAL REVIEW B, Vol: 78, ISSN: 1098-0121
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- Citations: 1
Steed R, Matthews M, Plumridge J, et al., 2008, Saturation of intersubband transitions in <i>p</i>-doped GaAs/AlGaAs quantum wells, APPLIED PHYSICS LETTERS, Vol: 92, ISSN: 0003-6951
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- Citations: 8
Ikonic Z, Harrison P, Steed R, et al., 2008, Simulation of hole intersubband scattering, transport, and luminescence in <i>p</i>-GaAs/AlGaAs quantum cascade structures, IEEE 21st International Semiconductor Laser Conference, Publisher: IEEE, Pages: 75-+
Matthews MR, Steed RJ, Frogley MD, et al., 2007, Transient photoconductivity measurements of carrier lifetimes in an InAs/In<sub>0.15</sub>Ga<sub>0.85</sub>As dots-in-a-well detector, APPLIED PHYSICS LETTERS, Vol: 90, ISSN: 0003-6951
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- Citations: 15
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