Ultrafast imaging for uncovering laser–material interaction dynamics

Wang, Du; Wei, Shubin; Yuan, Xiandan; Liu, Zhiyuan; Weng, Yueyun; Zhou, Yuqi; Xiao, Ting‐Hui; Goda, Keisuke; Liu, Sheng; Lei, Cheng

doi:10.1002/msd2.12024

Cited by 11 publications

(5 citation statements)

References 125 publications

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“…[ 31 ] Besides, the short pulse duration and intense peak power can bring in a rapid heating‐cooling process. [ 35 ] For TiO 2 , the modification of energy band structure noted above could be ascribed to the strong increase of conduction electron density, high temperature, as well as sharp temperature gradient under UF laser irradiation. Band engineering induced by UF laser was thus expected in the oxides.…”

Section: Resultsmentioning

confidence: 99%

“…[ 33 ] The rapid heating‐cooling process considerably inhibited the thermal growth of crystal nucleus and promoted the defects formation. [ 35 ] Therefore, defect level could be expected in the bandgap. It is known that the electrons excited from the valence band can be significantly captured and accommodated by the defect level below the conduction band, where visible‐light absorption can be enhanced and TiO 2 blackening occurred.…”

Section: Resultsmentioning

confidence: 99%

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Highly Stable and Reversible Coloration of Oxide Nanoparticles Film by Ultrafast‐CW Laser Induced Band Engineering

Hu,

Lin,

et al. 2024

Advanced Optical Materials

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Coloration in oxides meets the challenge in achieving high stability and repeatability simultaneously. In this work, reversible coloration of TiO2 nanoparticles (NPs) film is demonstrated by alternate ultrafast (UF) laser and continuous wave (CW) laser irradiation. Under UF laser irradiation, oxygen vacancies are introduced in the TiO2 lattice, which lead to the bandgap reduction (2.73 to 1.50 eV) and surface blackening. The blackened area can achieve high resolution with size down to ≈1.1 µm. This coloration in TiO2 also shows excellent thermal stability that color fading is negligible even after thermal annealing at 700 K for 2 h in air. The generated high temperature by CW irradiation is known to be beneficial for the O2 dissociation on defected TiO2, thus promoting the internal oxygen diffusion to eliminate the vacancies. The energy band structure of TiO2 can be recovered accordingly, and decoloration is achieved. TiO2‐NPs film shows stable microstructures with barely changed optical properties after 12 cycles of coloration–decoloration process. This band engineering‐induced reversible coloration can also be applicable for broad oxides, e.g., ZnO, HfO2, and Ga2O3. Such highly stable and reversible coloration is promising in high‐performance micro/nano‐devices development for color display and optical encryption.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Highly Stable and Reversible Coloration of Oxide Nanoparticles Film by Ultrafast‐CW Laser Induced Band Engineering

Hu,

Lin,

et al. 2024

Advanced Optical Materials

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“…To gain insight into the underlying ablation mechanisms, researchers have employed femtosecond pump-probe imaging to investigate transient optical properties [15,16]. However, during the signal acquisition process, these ablation processes have a significant effect on the optical response of the target materials [17][18][19]. For example, when molybdenum disulfide (MoS 2 ) is ablated by a femtosecond laser [20], the rise in electron density leads to a reduction in reflectivity when probed by a 400 nm femtosecond laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast quasi-three-dimensional imaging

Lian

Jiang

Sun

et al. 2023

Int. J. Extrem. Manuf.

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Understanding laser induced ultrafast process with complex three-dimensional (3D) geometrical and extreme property evolution offers unique platform to explore novel physical phenomena and to overcome manufacturing limitations. Ultrafast imaging has been considered as an effective tool due to their exceptional spatiotemporal resolution ability. However, the current imaging techniques with single view imaging actually projecting 3D information on two-dimensional plane, leading to great information loss, and misunderstanding the nature of ultrafast process. Here, we propose a quasi-3D imaging method to describe the 3D ultrafast process and further analyse spatial asymmetric of laser induced plasma. The vertically polarization laser pulses are adopted to illuminate reflection-transmission views, and the binarization techniques are employed to extract contours, forming the corresponding two-dimensional matrix. By rotating and multiplying the two-dimensional contour matrices obtained from the dual views, the quasi-3D image was reconstructed. It successfully unveils dual phase transition mechanisms and elucidates the diffraction phenomena occurring outside the plasma. Furthermore, the quasi-3D image confirms spatial asymmetric of plasma in picosecond plasma, which is hard to acquire in two-dimensional images. Our findings demonstrate that quasi-3D imaging not only offers a more comprehensive understanding of plasma dynamics than previous imaging methods, but also has widespread potential in various ultrafast fields such as strong-field physics, fluid dynamics, and cutting-edge manufacturing.

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“…Ultrafast science is an important aspect of modern scientific research that involves exploring the dynamic behaviors of microscopic particles 1–5 and developing strategies 6–12 to elucidate these behaviors through ultrahigh spatial and temporal resolution. This technique allows researchers to understand, apply, and control the related physics, 13–15 chemistry, 16,17 and other macroscopic phenomena 18–20 of these particles.…”

Section: Introductionmentioning

confidence: 99%

Probing electron and lattice dynamics by ultrafast electron microscopy: Principles and applications

Lian,

Sun,

Jiang

2023

Int Journal of Mech Sys Dyn

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Microscale charge and energy transfer is an ultrafast process that can determine the photoelectrochemical performance of devices. However, nonlinear and nonequilibrium properties hinder our understanding of ultrafast processes; thus, the direct imaging strategy has become an effective means to uncover ultrafast charge and energy transfer processes. Due to diffraction limits of optical imaging, the obtained optical image has insufficient spatial resolution. Therefore, electron beam imaging combined with a pulse laser showing high spatial–temporal resolution has become a popular area of research, and numerous breakthroughs have been achieved in recent years. In this review, we cover three typical ultrafast electron beam imaging techniques, namely, time‐resolved photoemission electron microscopy, scanning ultrafast electron microscopy, and ultrafast transmission electron microscopy, in addition to the principles and characteristics of these three techniques. Some outstanding results related to photon–electron interactions, charge carrier transport and relaxation, electron–lattice coupling, and lattice oscillation are also reviewed. In summary, ultrafast electron beam imaging with high spatial–temporal resolution and multidimensional imaging abilities can promote the fundamental understanding of physics, chemistry, and optics, as well as guide the development of advanced semiconductors and electronics.

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Ultrafast imaging for uncovering laser–material interaction dynamics

Cited by 11 publications

References 125 publications

Highly Stable and Reversible Coloration of Oxide Nanoparticles Film by Ultrafast‐CW Laser Induced Band Engineering

Highly Stable and Reversible Coloration of Oxide Nanoparticles Film by Ultrafast‐CW Laser Induced Band Engineering

Ultrafast quasi-three-dimensional imaging

Probing electron and lattice dynamics by ultrafast electron microscopy: Principles and applications

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