Article
Physics, Condensed Matter
Pardeep Kumar, Thakshila M. Herath, Vadym Apalkov
Summary: In this study, we theoretically investigate the interaction between an ultrastrong femtosecond-long linearly polarized optical pulse and AB-stacked bilayer graphene. The angle of incidence of the pulse can manipulate the generation of current and its direction, and the symmetry of BLG affects these processes.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Tianran Jiang, Xupeng Zhao, Zhifeng Chen, Yongyong You, Tianshu Lai, Jianhua Zhao
Summary: This study demonstrates the effect of phonon transport on ultrafast demagnetization and opens up a new route to manipulate ultrafast demagnetization in layered magnetic structures.
Article
Chemistry, Multidisciplinary
Peng Zheng, Jeeun Kang, Debadrita Paria, Jin U. Kang, Ishan Barman
Summary: The plasmonic Stark effect, as a complementary approach to the optical Stark effect, is shown to advance fundamental understanding of coherent light-matter interactions and provide new opportunities for advanced optoelectronic tools, such as ultrafast all-optical switches and biological nanoprobes at lower light power levels.
Review
Nanoscience & Nanotechnology
San Kim, Tae-In Jeong, Jongkyoon Park, Marcelo F. Ciappina, Seungchul Kim
Summary: Surface plasmons are the collective oscillation of electrons that can manipulate optical fields with unprecedented spatial and time resolutions. They have various applications in chemical/biological sensors and Raman scattering spectroscopy. The ultrafast optical response is a fundamental characteristic of surface plasmons, allowing for the study of photon-electron interactions. The plasmon-enhanced electric fields generated by focusing surface plasmons can reach the strong field regime with low input laser intensities.
Article
Optics
Yanxiang Zhang, Xiaofei Liu, Han Lin, Dan Wang, Ensi Cao, Shaoding Liu, Zhongquan Nie, Baohua Jia
Summary: This study proposes a new method for ultrafast modulation of multi-target focal fields based on the combination of time-dependent vectorial diffraction theory and fast Fourier transform. By focusing femtosecond pulsed light carrying vectorial-vortex, the importance of ultrafast temporal degree of freedom in determining the characteristics of the focused optical field is revealed, along with the underlying control mechanisms. The results of this study have wide-ranging applications in fields such as multifunctional integrated optical chips, high-efficiency laser trapping, and super-resolution optical microscopy.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Chemistry, Physical
Meilani Wibowo, Tom J. P. Irons, Andrew M. Teale
Summary: This study presents the implementation of real-time time-dependent Hartree-Fock and current density functional theory for molecules in strong magnetic fields, allowing for the investigation of electronic absorption spectra and their dependence on field strength and orientation. The performance of various propagator algorithms for real-time methods is evaluated and molecular orbital pair decomposition analysis is used to provide insights into electronic transitions and spectra evolution in strong magnetic fields.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Nanoscience & Nanotechnology
Michalis Stavrou, Nikolaos Chazapis, Vasileios Arapakis, Vasilios Georgakilas, Stelios Couris
Summary: Hematene and magnetene nanoplatelets were synthesized from hematite and magnetite ores using a green synthesis method and dispersed in water. These non-vdW 2D materials showed strong saturable absorption and Kerr-type nonlinear refractive index, suggesting potential applications in photonics and optoelectronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Multidisciplinary
Ying-Bin Li, Qin Ling-Ling, Chen Hong-Mei, Li Yi-Han, He Jin-Jin, Shi Lu-Ke, Zhai Chun-Yang, Tang Qing-Bin, Liu Ai-Hua, Yu Ben-Hai
Summary: Using a classical ensemble model, the study investigates the energy absorption of two electrons from a laser field and its dependence on laser parameters. The results demonstrate different trends in energy absorption based on the laser intensity, wavelength, and ellipticity. The analysis also identifies four channels that dominate the energy absorption process: double ionization, single ionization, frustrated single ionization, and frustrated double ionization. The findings provide insights into the dependence of energy absorption on laser parameters.
ACTA PHYSICA SINICA
(2022)
Article
Nanoscience & Nanotechnology
Jiahua Cai, Sai Chen, Chunyan Geng, Jianghao Li, Baogang Quan, Xiaojun Wu
Summary: We investigate the nonlinear modulation dynamics of a THz-nano metasurface on silicon substrates using a time-resolved strong-field THz-pump THz-probe (TPTP) technique. The self-modulation phenomenon with a frequency shift of about 50 GHz is achieved by switching the THz field strength. This phenomenon is attributed to the impact ionization (IMI) of the silicon substrate under the excitation of strong THz fields in nano-gaps.
Review
Chemistry, Multidisciplinary
Bo Fu, Jingxuan Sun, Yuan Cheng, Hao Ouyang, Giuseppe Compagnini, Peng Yin, Songrui Wei, Shaojuan Li, Dabing Li, Vittorio Scardaci, Han Zhang
Summary: Nanomaterials, including metal-based nanoparticles, exhibit excellent mechanical, thermal, optical, and electrical properties, with metal nanoparticles demonstrating enhanced optical properties through surface plasmon resonance and metal oxide nanoparticles closely related to bandgap structures. Additionally, the preparation methods of materials and other phenomena such as spin inversion and excitons play important roles in optical absorption.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Condensed Matter
Mitsuko Murakami, G. P. Zhang
Summary: In this study, a method to simulate demagnetization in ferromagnetic transition metals driven by a femtosecond laser pulse was proposed. By incorporating intraband transitions using a convective derivative in the crystal momentum space, the calculated results showed a significant enhancement in the amount of demagnetization, which is in agreement with experimental observations. Additionally, the effect of intraband transitions on each ferromagnetic material was found to be distinctly different due to their varying band structures and spin properties.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
Yiqi Fang, Zhenning Guo, Peipei Ge, Xueyan Ma, Meng Han, Xiaoyang Yu, Yongkai Deng, Qihuang Gong, Yunquan Liu
Summary: This experimental study demonstrates the characteristics of intense, structured light fields with controlled optical singularities in strong-field photoionization. Different types of optical singularities are identified through photoionization observables, and the behaviors of these singularities are visualized by photoelectron momentum distributions. This work advances both strong-field science and singularity optics.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Chemistry, Multidisciplinary
Felix Stete, Matias Bargheer, Wouter Koopman
Summary: The strong interaction between plasmons and excitons can generate new hybrid polariton states with potential applications. However, the transient behavior of these systems is not fully understood. In this study, we provide conclusive evidence that the interesting nonlinear features observed in the picosecond time scale are due to heat generation inside the particles. We introduce a concise model that can accurately recreate the transient spectra by assuming an initial temperature rise of the electron gas inside the particles.
Article
Physics, Multidisciplinary
Muhammad Qasim, Dmitry A. Zimin, Vladislav S. Yakovlev
Summary: Multiphoton excitation of a solid using a few-cycle, intense laser pulse creates a non-equilibrium distribution of charge carriers with an emergence of population inversion between valence-band states, resulting in stimulated emission in the solid. The study establishes optimal conditions for observing this strong-field-induced optical gain.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Le-Yi Zhao, Hai Wang, Hai-Yu Wang, Qiang Zhou, Xu-Lin Zhang, Tong Cui, Lei Wang, Tian-Yu Liu, Yu-Xiao Han, Yang Luo, Yuan-Yuan Yue, Mu-Sen Song, Hong-Bo Sun
Summary: The study highlights the potential of constructing multiple polarization polaritonic devices by building hybrid systems of TMDCs and SPPs in the strong coupling regime. By analyzing the spectra of different polarizations, it demonstrates the dynamics of valley polaritons and the long-lasting polarized effect in the strong coupling system.
