A5070926874- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Solid State Laser Technologies
- Ferroelectric and Piezoelectric Materials
- Nonlinear Photonic Systems
- Photonic Crystal and Fiber Optics
- Atomic and Molecular Physics
- Quantum optics and atomic interactions
- Organic Electronics and Photovoltaics
- Laser Design and Applications
- Dielectric materials and actuators
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Semiconductor materials and devices
- Mass Spectrometry Techniques and Applications
- Acoustic Wave Resonator Technologies
- Advanced X-ray Imaging Techniques
- Advanced Memory and Neural Computing
Fudan University
2014-2024
State Key Laboratory of Surface Physics
2019-2024
Shanghai Fudan Microelectronics (China)
2016
Abstract Generating intense ultrashort pulses with high-quality spatial modes is crucial for ultrafast and strong-field science can be achieved by nonlinear supercontinuum generation (SCG) pulse compression. In this work, we propose that the of quasi-stationary solitons in periodic layered Kerr media greatly enhance light-matter interaction fundamentally improve performance SCG compression condensed media. With both experimental theoretical studies, successfully identify these solitary...
Abstract Quantum-state manipulation through coherent interaction with a radiation field is fundamental process broad implications in quantum optics and information processing. However, current control methods are limited by their operation at Rabi frequencies below the gigahertz range, which restricts applicability to systems long coherence times. To overcome this limitation, alternative approaches utilizing ultrafast driving lasers have garnered great interest. In work, we demonstrate...
In recent years ferroelectric polymers have attracted much attention due to their potentials in flexible electronics. To satisfy the requirements of low operation voltage and power consumption, it is required reduce film thickness down to, for example, 100 nm. However, decreased results crystallinity thus worse electrical performance. One possible solution realize epitaxial growth thin films via effective control structure orientation crystals. Here we report our work on...
The high power and variable repetition-rate of Yb femtosecond lasers makes them very attractive for ultrafast science. However, capturing sub-200 fs dynamics, efficient, high-fidelity high-stability pulse compression techniques are essential. Spectral broadening using an all-solid-state free-space geometry is particularly attractive, as it simple, robust low-cost. spatial temporal losses caused by spatio-spectral inhomogeneities have been a major challenge to date, due coupled space-time...
The concept of critical ionization fraction has been essential for high-harmonic generation, because it dictates the maximum driving laser intensity while preserving phase matching harmonics. In this work, we reveal a second, nonadiabatic fraction, which substantially extends phase-matched harmonic energy, arising strong reshaping intense field in gas plasma. We validate understanding through systematic comparison between experiment and theory wide range conditions. particular, properties...
Ferroelectric polymers are a kind of promising materials for low-cost flexible memories. However, the relatively high thermal annealing temperature restricts selection some polymer substrates. Here we report an alternative method to obtain ferroelectric poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) thin films under low process temperatures. Spin-coated P(VDF-TrFE) were solvent vapor processed at 30 °C varied times. Structural analyses indicated that induced crystallization form...
Organic semiconducting/ferroelectric blend films attracted much attention due to their electrical bistability and rectification properties thereof the potential in resistive memory devices. During film deposition from solution, spinodal decomposition induced phase separation, resulting discrete semiconducting whose property could be modulated by continuous ferroelectric phase. However, processed common spin coating method showed extremely rough surfaces, even comparable thickness, which...
Ferroelectric polymer-based memory devices have attracted much attention due to their potential in low-cost flexible memories. However, bad retention property of recorded logic states limited applications. Though mechanisms degradation ferroelectric memories are complicated and still an open question, depolarization polymer layer was regarded as the main influencing factor. Here we reported our piezoresponse force microscopy (PFM) study polarization on various based structures. PFM results...
Organic ferroelectric field-effect transistors (OFeFETs) are regarded as a promising technology for low-cost flexible memories. However, the electrical instability is still critical obstacle, which limits commercialization process. Based on already established models polarization in ferroelectrics and charge transport OFeFETs, simulation work performed to determine influence of fatigue switching transient characteristics OFeFETs. The results decrease on-state drain current memory window...
Nonadiabatic phase matching of high-harmonic generation (HHG) driven by few-cycle laser pulses is essential for extending harmonic energy and generating isolated attosecond pulses. However, understanding nonadiabatic HHG challenging due to the complex interplay various optical phases temporally spatially varying fields. Theoretical calculations typically rely on computationally demanding 3-dimensional simulations, which can make it difficult extract features HHG. In this work, we develop a...
In this work we present a route for energy scaling in external pulse compression based on layered Kerr media combined with 1D focusing geometry. A highly stable 92%-efficient 4-fold of 1030-nm pulses is demonstrated.
We experimentally demonstrate that temporally confined spatial solitons can be realized by space-time coupled propagation of strong femtosecond pulses in a nonlinear optical resonator, consisting periodic layered Kerr media (PLKM). A universal relationship between the characteristic beam size and critical phase solitary modes is revealed, defining different regions soliton stability. Taking advantage unique characters these modes, we supercontinuum generation pulse compression initially 260...
We investigate the femtosecond supercontinuum generation and compression in layered Kerr media. The condition for extending setup a sustainable way is revealed, with characteristic spectral temporal features. demonstrate tenfold pulse single-stage multiplate by including 14 layers of thin medium.
Extending the photon energy range of bright high-harmonic generation to cover entire soft X-ray region is important for many applications in science and technology. The concept critical ionization fraction has been essential, because it dictates maximum driving laser intensity that can be used while preserving harmonic emission. In this work, we reveal a second, nonadiabatic substantially extends phase-matched energy, arises due strong reshaping intense field. We validate understanding...
A predictive method for all-solid-state high-quality pulse compression is proposed and experimentally demonstrated. The 170 fs pulses from a Yb:KGW laser compressed to ~9.2 with highly spatially homogeneous mode high efficiency of >50%.