A5060439545- Laser-Matter Interactions and Applications
- Magnetic properties of thin films
- Advanced Fiber Laser Technologies
- ZnO doping and properties
- Laser-Plasma Interactions and Diagnostics
- Magnetic and transport properties of perovskites and related materials
- Spectroscopy and Quantum Chemical Studies
- Physics of Superconductivity and Magnetism
- Mass Spectrometry Techniques and Applications
- Multiferroics and related materials
- Hearing Loss and Rehabilitation
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Applications
- Optical Polarization and Ellipsometry
- Theoretical and Computational Physics
- Electron Spin Resonance Studies
- Nonlinear Optical Materials Research
- Magnetic Properties and Synthesis of Ferrites
- Laser-induced spectroscopy and plasma
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
National Tsing Hua University
2020-2024
National Changhua University of Education
2015-2023
National Sun Yat-sen University
2003-2013
The advancement of contemporary ultrafast science requires reliable sources to provide high-energy few-cycle light pulses. Through experiments and simulations, we demonstrate an arrangement pulse postcompression, referred as cascaded focus compression (CASCADE), for generating millijoule-level, single-cycle pulses in a compact fashion. CASCADE is realized by series foci matter, whereas provided immediately after each maintain high efficiency spectral broadening. By implementing four stages...
In this study, X-ray absorption near-edge structure (XANES), extended fine (EXAFS), magnetic circular dichroism (XMCD) and element- site-specific hysteresis (ESMH) are used to elucidate the effect of geometry (0-3- 2-2-type) on properties CoFe2O4–PbTiO3 (CFO–PTO) multiferroic composites by comparison with those reference CFO PTO powders. Magnetic Co ions in have been confirmed be located at both tetrahedral (A)- octahedral (B)-sites. retains its mixed-spinel as verified EXAFS, XMCD ESMH...
Polarization engineering and characterization of coherent high-frequency radiation are essential to investigate control the symmetry properties light–matter interaction phenomena at their most fundamental scales. This work demonstrates that polarization high-harmonic generation provides an excellent ellipsometry tool can fully retrieve both amplitude phase a strong-field-driven dipole response. The is realized by transient nonlinear grating coherently induced two noncollinear counterrotating...
Antiferromagnetic (AFM) thin films were recently proposed to be an alternative conventional materials for achieving perpendicular magnetic anisotropy (PMA) in ferromagnetic films, because AFM exhibit advantage of flexible control. Here, we report that antiferromagnet-induced PMA is highly sensitive interfacial moments as well the interaction such with volume moments, determined according vertical interlayer distance. Magnetic hysteresis loops and x-ray domain imaging revealed establishment...
This work investigates local atomic and electronic structures of PbZr0.52Ti0.48O3 (PZT) thin films with <001>, <101>, <111> orientations using extended x-ray absorption fine structure (EXAFS) near-edge (XANES) spectroscopy θ = 0° 70° incident angles. The EXAFS result indicates that the <001>-oriented PZT film has a polarization dominantly along c-axis, while both <101>- <111>-oriented have dominant...
Ferromagnetic (FM) films with higher magnetic moment density typically exhibit sizable in-plane anisotropy as a result of strong dipolar interactions, which hinder their application in state-of-the-art perpendicularly based devices. This study reports the effects triggering perpendicular (PMA) Co/Fe film through nearby antiferromagnetic (AFM) fcc ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ and face-centered tetragonal (e-fct) Mn films. Our results demonstrate that three-dimensional quadratic AFM...
Antiferromagnetic (AFM) thin films have been proposed as a promising material for manipulating perpendicular magnetic anisotropy (PMA) in ferromagnetic (FM) films. In this work, series of epitaxially grown AFM/Co/Fe structures are investigated, which the AFM layer is composed fcc ${\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ and vertically expanded face-centered-tetragonal Mn with distinct three-dimensional quadratic-type two-dimensional layered spin structures, respectively. Our findings...
Antiferromagnetic (AFM) thin films are promising materials for engineering the magnetic anisotropy of adjacent ferromagnetic (FM) films. In this work, we explored effects triggering perpendicular (PMA) FM by applying a series NiMn-based AFM with in-plane-oriented spin structures. The vertically expanded face-centered tetragonal ${\mathrm{Ni}}_{50}{\mathrm{Mn}}_{50}$ alone could not induce PMA in Co/Ni By contrast, was triggered through application Mn-rich NiMn alloy or...
Ferromagnetic (FM) films with perpendicular magnetic anisotropy (PMA) are crucial building blocks of state-of-the-art devices. This study investigated the effects triggering PMA in FM thin by applying ${\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Pd}}_{x}$-based antiferromagnetic (AFM) strong AFM exchange coupling from Mn and high spin-orbit Pd atoms. Our results reveal that ${\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Pd}}_{x}$ can trigger Co/Ni weak in-plane at room temperature through either...
Two-dimensional atomic layers composed of metallic atoms with a high principal quantum number in valence shells are promising materials for applications state-of-the-art magnetic devices due to the presence strong spin-orbit coupling. In this work we experimentally explored effects triggering perpendicular anisotropy (PMA) ferromagnetic (FM) films by applying series $6p$-Pb, Bi and $4d$-Pd (reference) high-level orbital low-level lattice strain. Our research indicates that, compared Pd...
For the first time, an isolated attosecond pulse is directly generated from Yb-laser. Intense post-compressed 3.5-fs pulses at 1030 nm were focused into a gas cell filled with neon, resulting in generation of 64-as pulses, which characterized by streaking.
Extremely nonlinear interactions between intense light pulses and atoms or molecules can generate new frequencies. Here, we observed high-order harmonics of acoustic waves in laser-induced plasma air ionized by carrier-envelope offset phase (CEP) stabilized sub-4 femtosecond pulses. The frequency spacing the corresponds to laser repetition rate, with harmonic order reaching beyond one hundred. Remarkably, intensity was found depend on CEP driving Furthermore, optical combs be directly...
Isolated attosecond pulses (IAPs) generated by few-cycle femtosecond lasers are essential for capturing ultrafast dynamics in atoms, molecules, and solids. Nonetheless, the advancement of science critically depends on achieving stable, high-temporal-contrast IAPs. Our study reveals a universal scenario which self-compression infrared driver high harmonic generation extended gas media leads to high-contrast high-frequency IAP generation. experimental theoretical results reveal that...
We demonstrate that polarization control and characterization of high-harmonic generation in non-collinear geometry performs as an excellent ellipsometry can fully retrieve the amplitude phase ultrafast dipole response, advancing high harmonic spectroscopy.
Ni and Fe L3,2-edge magnetic circular dichroism (MCD) Cr K-edge x-ray absorption near-edge structure measurements have been performed for the Py/Cr(tCr)/Py (Py=Ni80Fe20) trilayers with tCr=5, 10, 15, 20, 25 Å. The MCD asymmetry ratios in L3-edges spectra are found strongly affected by thickness of layer. moments 3d states found, respectively, to decrease increase suddenly when tCr increases beyond 20 measured magneto-optical Kerr effect hysteresis loops show a...
We demonstrate that polarization control and characterization of high-harmonic generation in non-collinear geometry perform as excellent ellipsometry can precisely retrieve the non-perturbative dipole response, both amplitude phase, extremely nonlinear up-conversion process.
We demonstrate that polarization control and characterization of high-harmonic generation in non-collinear geometry performs as an excellent ellipsometry can fully retrieve the amplitude phase ultrafast dipole response, advancing attosecond metrology.
We introduce a new post-compression, cascaded focus and compression, to shorten the mJ-level pulses at 1030 nm by factor of 50 down 3.1 fs (single-cycle) with an output pulse energy 0.98 mJ overall efficiency 73%.
By cascaded focusing and compressing, we demonstrated 50-fold postcompression of carrier-envelope-phase-stabilized, 157 fs 1.34 mJ pulses at 1030 nm down to 3.1 (single-cycle) with a pulse energy 0.98 mJ.
We demonstrate that polarization control and characterization of high-harmonic generation in non-collinear geometry performs as an excellent ellipsometry can fully retrieve the amplitude phase ultrafast dipole response, advancing high harmonic spectroscopy.