检索结果-内蒙古大学图书馆

作者： Xing, Ruo Chen Xiao, Si He, Jun Institute of Super-microstructure and Ultrafast Process in Advanced Materials School of Physics and Electronics Central South University Changsha 410083 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University Changsha 410083 China

ISBN: (纸本)9783038351214

The polarization dependent nonlinear absorption was observed in ordered Au nanowire array. The linear and nonlinear polarized absorption at 780 nm is investigated by Z-scan. When the angle between the polarization direction of input laser and the long axis of Au nanowires is 90°(perpendicular), the linear absorption reaches the maximum and the nonlinear absorption reaches the minimum. The nonlinear absorption coefficient β decreases from positive to negative as the angle increase from 0° to 90°. There may be two nonlinear absorption mechanisms resulting in this phenomenon: two-photon absorption and saturable absorption in nanoscale. © (2014) Trans Tech Publications, Switzerland.

关键词： Polarization

来源：评论

学校读者我要写书评

暂无评论

Characteristics research of gallium arsenide solar cells under femtosecond laser illumination

Characteristics research of gallium arsenide solar cells und...

引用

作者： Xiao, Si Gao, Yi Tan Tian, Xiu Qin He, Jun Institute of Super-microstructure and Ultrafast Process in Advanced Materials Department of Physics and Electronics Central South University Changsha 410083 China Hunan Key Laboratory for Super-microstructure and Ultrafast Process Central South University Changsha 410083 China

ISBN: (纸本)9783038351214

Femtosecond laser with ultrashort pulse (≤35fs) is used to investigate the damage threshold and light-to-electric conversion efficiency of gallium arsenide solar cells. Different from nanosecond or picosecond lasers, the damage threshold of the solar cell illuminated by femtosecond laser is slightly higher than that under the illumination of continuous-waves laser with the same wavelength. Because the thermal non-equilibrium effect becomes obvious, heat conduction phenomenon no longer obeys the law of Fourier, when the heating pulse time of femtosecond laser is equal to or shorter than the electron- phonon coupling time. The photovoltaic properties of gallium arsenide solar cells under femtosecond pulse laser illumination are measured. The device shows better short circuit current and the light-to-electric conversion efficiency under femtosecond pulse laser than that under continuous-waves laser of the same wavelength. © (2014) Trans Tech Publications, Switzerland.

关键词： Solar cells

来源：评论

学校读者我要写书评

暂无评论

Protection of entanglement between two V-atoms in a multi-cavity coupling system

引用

Chinese Physics B 2022年第1期31卷 124-129页

作者： Wen-Jin Huang Mao-Fa Fang Xiong Xu Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of EducationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China School of Physics and Electronics Hunan Key Laboratory of Super Microstructure and Ultrafast ProcessState Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China

The protection of the entanglement between two V-atoms(EBTVA)in a multi-cavity coupling system is *** whole system consists of two *** two V-atoms are initially in the maximum entangled state and interacts locally with its own dissipative cavity which is coupled to the external cavities with high quality factor(ECWHQF).The results show that,when there is no ECWHQF,the EBTVA can be protected effectively in the case where the V-atom and the dissipative cavity are weak coupled in large detuning,while when there are different numbers n of ECWHQF coupled to two dissipative cavities,by adjusting the parameters of the number n of ECWHQF and the coupling strength k between cavities,the EBTVA can be protected perfectly and *** result provides an effective method for protecting entanglement resources of three-level system.

关键词： V-atom multi-cavity coupling system entanglement negativity

来源：评论

学校读者我要写书评

暂无评论

Two-step processed efficient perovskite solar cells via improving perovskite/PTAA interface using solvent engineering in PbI2 precursor

引用

Chinese Physics B 2020年第4期29卷 563-570页

作者： Cao-Yu Long Ning Wang Ke-Qing Huang Heng-Yue Li Biao Liu Jun-Liang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The morphology and interface of perovskite film are very important for the performance of perovskite solar cells(PSCs).The quality of perovskite film,fabricated via two-step spin-coating process,is significantly influenced by the morphology and crystallinity of PbI2 *** the addition of additive dimethyl sulfoxide(DMSO)into the PbI2 precursor,the roughness and trap-state density of perovskite film have been significantly reduced,leading to the excellent contact between perovskite layer and subsequent deposited carrier transport ***,the planar heterojunction PSCs with an architecture of ITO/SnO2/perovskite/PTAA/Ag show an efficiency up to 19.02%.Furthermore,PSCs exhibit promising stability in air with a humidity of ~45%,and retain 80% of initial efficiency after being exposed to air for 400 h without any encapsulation.

关键词： perovskite solar cells planar heterojunction interface PbI2-DMSO complex

来源：评论

学校读者我要写书评

暂无评论

Modulated thermal transport for flexural and in-plane phonons in double-stub graphene nanoribbons

引用

Chinese Physics B 2018年第8期27卷 566-571页

作者： Chang-Ning Pan Meng-Qiu Long JuJa He Hunan Key Laboratory of Super Micro-structure and Ultrafast Process School of Physics and Electronics Central South UniversityChangsha 410083China School of Science Hunan University of TechnologyZhuzhou 412008China

Thermal transport properties are investigated for out-of-plane phonon modes （FPMs） and it-plane phonon modes （IPMs） in double-stub graphene nanoribbons （GNRs）. The results show that the quantized thermal conductance plateau of FPMs is narrower and more easily broken by the double-stub structure. In the straight GNRs, the thermal conductance of FPMs is higher in the low temperature region due to there being less cut-off frequency and more low-frequency excited modes. In contrast, the thermal conductance of IPMs is higher in the high temperature region becau~,＇.e of the wider phonon energy spectrum. Furthermore, the thermal transport of two types of phonon modes can be modulated by the double-stub GNRs, the thermal conductance of FPMs is less than that of IPMs in the low temperatures, but it dominates the contribution to the total thermal conductance in the high temperatures. The modulated thermal conclu~＇tanc：e can provide a guideline for designing high-performance thermal or thermoelectric nanodevices based on graphene.

关键词： graphene nanoribbon flexural phonons in-plane phonons thermoelectric properties

来源：评论

学校读者我要写书评

暂无评论

The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators

引用

Science China Materials 2020年第12期63卷 2551-2559页

作者： Pengshan Xie Tianjiao Liu Pei He Guozhang Dai Jie Jiang Jia Sun Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Organic thin film transistors(OTFTs)are normally sensitive to ambient conditions and show performance degradation in *** the contrary,the performance of flexible 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene(C8-BTBT)OTFTs using cross-linked polymer layer,poly(4-vinyl-phenol)-4,4’-(hexafluoroisopropylidene)diphthalic anhydride(PVP-HDA),as the dielectric layer can be improved in air conditions with 40%relative *** soaking in air with 40%relative humidity,the electrical behavior,surface morphology,and contact angle of the flexible C8-BTBT OTFTs using PVP-HAD as dielectric layer with three different thicknesses were *** is found that,when the devices with 375 nm-thick PVP-HDA films are placed in 40%relative humidity air conditions for 6 h,the corrected average mobility(μ)can increase from 3.2 to 5.1 cm^2 V^-1 s^-***,the average threshold voltage(Vth)changes from-12.4 to-9.3 V while keeping a constant ratio of I on/Ioff=10^*** results indicate that the flexible C8-BTBT OTFTs with PVP-HDA dielectric layer exhibit interesting application prospects.

关键词： flexible electronics C8-BTBT OTFTs PVP-HDA hygroscopicity air stability

来源：评论

学校读者我要写书评

暂无评论

Revealing the intrinsic nonlinear optical response of a single MoS_(2) nanosheet in a suspension based on spatial self-phase modulation

引用

Photonics Research 2020年第11期8卷 1725-1733页

作者： Si Xiao Ying Ma Yilin He Yiduo Wang Hao Xin Qi Fan Jingdi Zhang Xiaohong Li Yu Zhang Jun He Yingwei Wang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

The reorientation of 2D materials caused by nonlocal electron coherence is the formation mechanism of 2D material spatial self-phase modulation under laser irradiation,which is widely known as the“wind-chime”***,we present a method that provides strong evidence for the reorientation of 2D-material-induced spatial self-phase *** traditional“wind-chime”model was modified by taking into account the attenuation,i.e.,damping of the incident light beam in the direction of the optical ***,we can extract the nonlinear refractive index of a single MoS2 nanosheet,instead of simply obtaining the index from an equivalent MoS2 film that was constructed by all *** approach introduces a universal and accurate method to extract intrinsic nonlinear optical parameters from 2D material systems.

关键词： nonlinear intrinsic phase

来源：评论

学校读者我要写书评

暂无评论

Solution-processed perovskite solar cells

引用

Journal of Central South University 2020年第4期27卷 1104-1133页

作者： CHANG Jian-hui LIU Kun LIN Si-yuan YUAN Yong-bo ZHOU Cong-hua YANG Jun-liang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Perovskite solar cells(PSCs) have emerged as one of the most promising candidates for photovoltaic applications. Low-cost, low-temperature solution processes including coating and printing techniques makes PSCs promising for the greatly potential commercialization due to the scalability and compatibility with large-scale, roll-to-roll manufacturing processes. In this review, we focus on the solution deposition of charge transport layers and perovskite absorption layer in both mesoporous and planar structural PSC devices. Furthermore, the most recent design strategies via solution deposition are presented as well, which have been explored to enlarge the active area, enhance the crystallization and passivate the defects, leading to the performance improvement of PSC devices.

关键词： perovskite solar cells mesoporous structure planar structure solution process large-scale deposition techniques

来源：评论

学校读者我要写书评

暂无评论

Coherent couplings between magnetic dipole transitions of quantum emitters and dielectric nanostructures

引用

Photonics Research 2019年第10期7卷 1142-1153页

作者： QIAN ZHAO ZHONG-JIAN YANG JUN HE Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Here we study theoretically the optical responses of hybrid structures composed of dielectric nanostructures and quantum emitters with magnetic dipole transitions. Coherent couplings between magnetic dipole transitions and magnetic modes can occur, leading to giant modifications of the extinction spectra of the constituents in the hybrid structures. For a given hybrid structure, the extinction-cross-section spectra show linear or nonlinear behaviors depending on the strength of the excitation field. For a weak excitation, the extinction of the quantum emitters is greatly enhanced. The hybrid structure shows a dip on its extinction spectrum. For a strong excitation,the resonant extinction of the quantum emitters is weakly enhanced while the extinction spectrum is broadened obviously. The hybrid structure shows a Fano-like line shape on its extinction spectrum, which is different from that with a weak excitation. This difference is highly related to the behaviors of the magnetic polarizabilities of the quantum emitters in the hybrid structure. The optical responses of hybrid structures can be largely tuned by varying the geometric and material parameters.

关键词： structure. field. quantum

来源：评论

学校读者我要写书评

暂无评论

A review on spatial self-phase modulation of two-dimensional materials

引用

Journal of Central South University 2019年第9期26卷 2295-2306页

作者： ZHANG Xue-jun YUAN Zhen-hua YANG Rui-xin HE Yi-lin QIN Ying-lin XIAO Si HE Jun Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Self-diffraction appears when the strong laser goes through two-dimensional material suspension,and this spatial self-phase modulation(SPPM)phenomenon can be used to measure nonlinear optical parameters and achieve optical *** present,the mechanism of SPPM is still *** debate mainly focuses on whether the phenomenon is caused by the nonlinear refractive index of the two-dimensional material or the thermal effect of the *** lack of theory limits the dimension of the phase modulation to the radius of the diffraction ring and the vertical ***,it is urgent to establish a unified and universal SSPM theoretical system of two-dimensional material.

关键词： nonlinear optics spatial self-phase modulation two-dimensional materials

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：