Article
Optics
Sven Froehlich, Xu Liu, Aimrane Hamdou, Alric Meunier, Mukhtar Hussain, Mathieu Carole, Shatha Kaassamani, Marie Froidevaux, Laure Lavoute, Dmitry Gaponov, Nicolas Ducros, Sebastien Fevrier, Philippe Zeitoun, Milutin Kovacev, Marta Fajardo, Willem Boutu, David Gauthier, Hamed Merdji
Summary: We demonstrate a self-probing method for imaging an object using semiconductor high-harmonic generation. Combining ptychography measurements with nanopatterned crystals, we are able to obtain structural information of the object. This innovative approach has the potential to revolutionize nanoscale imaging of photonic and electronic devices.
Article
Optics
Zhiming Yin, Xiangyu Tang, Xuhong Li, Beiyu Wang, Jiaxin Han, C. D. Lin, Cheng Jin
Summary: Experimental simulations show that high-order harmonic generation from a long intense femtosecond laser can produce multiple shorter attosecond sub-bursts within each half optical cycle, which is different from the well-known attosecond pulse trains. The duration of each sub-burst scales approximately with the driving laser wavelength, and their origin is attributed to the interference of quantum orbits from the first two returns of the recombining electron. These sub-bursts can be phase matched and observed experimentally under specific laser focusing conditions and gas cell positioning.
Article
Materials Science, Multidisciplinary
Yuta Murakami, Michael Schueler
Summary: This paper investigates the doping and gap-size dependence of high-harmonic generation (HHG) in gapped graphene and emphasizes the importance of consistent expression of the current for studying parameter dependence in small gap systems.
Article
Engineering, Chemical
Yiqiao Wang, Jianhong Ye, Bin Hu, Yu Xie, Yun Ling, Zilin Wang, Yong Chen
Summary: Photocatalytic hydrogen production is an effective solution to the energy crisis, but the slow electron-hole separation efficiency of existing photocatalysts poses a challenge. Designing a photocatalyst with high carrier separation efficiency is difficult. In this study, non-precious metal NiO is used as a co-catalyst and forms a heterojunction with ZnIn2S4 (ZIS), significantly enhancing carrier separation efficiency. The ZnIn2S4/NiO (ZIS/NiO) with a NiO mass fraction of 3% exhibits the fastest carrier separation rate and achieves a photocatalytic hydrogen production rate 6.2 times higher than pure ZIS under visible light (& lambda; & GE; 420 nm). This work provides a low-cost and high-performance co-catalyst option.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Thi Huong Nguyen, Van Quang Nguyen, Anh Tuan Pham, Jong Ho Park, Ji Eun Lee, Jae Ki Lee, Sudong Park, Sunglae Cho
Summary: CuAgSe is a promising thermoelectric material with controllable carrier type through growth process or doping, achieving high ZT values in undoped CuAgSe.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
Takumi Kimura, Kouhei Matsumori, Kenichi Oto, Yoshihiko Kanemitsu, Yasuhiro Yamada
Summary: The study demonstrated that the electron and hole mobilities of a CH3NH3PbBr3 single crystal can be significantly enhanced by photo-doping in the high-carrier density regime. In the low-carrier density regime, the experimental results indicate that charged dislocation scattering dominates the carrier transport at room temperature.
APPLIED PHYSICS EXPRESS
(2021)
Article
Chemistry, Multidisciplinary
Zhenbin Tang, Juguo Dai, Wenkang Wei, Zhi Gao, Zhixuan Liang, Chenzhi Wu, Birong Zeng, Yiting Xu, Guorong Chen, Weiang Luo, Conghui Yuan, Lizong Dai
Summary: This study addresses the issue of low dynamic or stimuli-responsive behavior in supercapacitors by designing a MoS2@carbon core-shell structure. The structure exhibits high specific capacitance and cyclic stability, and can increase capacitance under the stimulation of light.
Article
Optics
Amin Sadeghifaraz, Elnaz Irani, Mohammad Monfared
Summary: This study investigates high harmonic generation in semiconductor materials using an accurate time dependent density functional theory model. The effect of driving laser parameters on generating attosecond pulses is examined. The results demonstrate that nonlinearly chirped lasers can generate high-energy harmonics and produce short-duration attosecond pulses.
OPTICS COMMUNICATIONS
(2022)
Article
Energy & Fuels
Juran Kim, Ha Kyung Park, Yunae Cho, Sammi Kim, Kee-Jeong Yang, Dae-Hwan Kim, Jin-Kyu Kang, William Jo
Summary: In this study, the optimization process of NaF layers in CZTSSe films deposition was investigated, and the effects of Na on the growth and carrier transport of kesterite were studied.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Optics
V. A. Birulia, M. A. Khokhlova, V. V. Strelkov
Summary: This study investigates the attosecond properties of coherent extreme ultraviolet (XUV) generated via high-order frequency mixing (HFM) through theoretical and numerical analysis. The research finds that the duration and carrier-envelope phase of the attosecond pulses generated by HFM can be effectively controlled, especially when one of the generating fields has much lower frequency and intensity compared to the other.
Article
Optics
Xiaoyue Yu, Guanqun Sun, Fangzheng Zhang, Shilong Pan
Summary: This Letter proposes the use of dual-wavelength-injection period-one laser dynamics to generate frequency-modulated microwave signals. The frequency and bandwidth of the generated signals can be easily adjusted by tuning the injection parameters.
Article
Chemistry, Multidisciplinary
Mauro Fernandes Pereira
Summary: Semiconductor superlattices are important nanomaterials for THz nonlinear optics. Our research focuses on two experimental phenomena that have not been explained: the generation of even harmonics at high orders and the asymmetry of harmonic power output from negative to positive bias. By breaking the symmetry of current flow, we explain these phenomena and propose a new method for designing the power output of these materials. Additionally, we develop a new approach for the Boltzmann Equation under relaxation-rate approximation, which improves numerical calculations.
Article
Multidisciplinary Sciences
Jianqi Hu, Edgars Nitiss, Jijun He, Junqiu Liu, Ozan Yakar, Wenle Weng, Tobias J. Kippenberg, Camille-Sophie Bres
Summary: This study reports the combined chi(2) and chi(3) nonlinear effects in a normal dispersion Si3N4 microresonator. It is demonstrated that the photo-induced chi(2) grating not only provides phase-matching for the sum-frequency generation process, but also enables the initiation and successive switching of primary combs. Additionally, effective third-harmonic generation is achieved through the doubly resonant pump and second-harmonic fields. These results expand the scope of cascaded effects in microresonators.
Article
Physics, Multidisciplinary
Tingting Liu, Qianjun Wang, Cheng Zhang, Xiaofeng Li, Jun Hu
Summary: Through first-principles calculation and Monte Carlo simulation, this study suggests that TiN could be a promising plasmonic material for high-efficiency hot-carrier applications, showing advantages over Au in hot-carrier generation and transport, especially high hot-carrier injection efficiency in core/shell structures.
FRONTIERS OF PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Yongxin Qin, Tao Hong, Bingchao Qin, Dongyang Wang, Wenke He, Xiang Gao, Yu Xiao, Li-Dong Zhao
Summary: By introducing Cu with different roles into p-type PbS, this study effectively reduces lattice thermal conductivity and optimizes electrical transport properties. Experimental results show that Cu substitutions and interstitials can improve carrier mobility and shift the peak power factor to lower temperatures, leading to record-high ZT values. The special dynamic-doping behaviors of Cu continuously promote carrier concentration towards a temperature-dependent relationship, resulting in an eminent average power factor among the tested temperature range.
ADVANCED FUNCTIONAL MATERIALS
(2021)
