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Effects of High Pressure on the Surface Plasmon Resonance of Copper and Silver Nanocrystals

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Chemical Research in Chinese Universities 2022年第3期38卷 843-846页

作者： LUO Zha LIU Hao SHEN Wei SHI Kun CHEN Ankang SHENG Libo SUI Yongming ZOU Bo State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun130012P.R.China

We used a diamond anvil cell(DAC)to control the deformation of synthesized copper nanorods and silver *** we measured the surface plasmon resonance of copper nanorods and silver nanoparticles,which exhibit redshifts or *** surface plasmon resonance shows an abnormal blue shift for both copper nanorods and silver *** solvents of copper nanorods and silver nanoparticles are n-hexane and water,where the pressure loads include quasi-hydrostatic and non-hydrostatic.

关键词： High pressure Surface plasmon resonance optical absorption

Density functional theory studies of the optical properties of a β-FeSi_2 (100)/Si(001) interface at high pressure

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Journal of Semiconductors 2013年第7期34卷 11-14页

作者：李海涛钱军韩芳芳李廷会 College of Electronic Engineering Guangxi Normal University Department of Physics Chengde Teacher's College for Nationalities National Laboratory of Solid State Microstructures and Department of Physics Nanjing University

High pressure has a significant influence onβ-FeSi_2 band gaps and optical absorption *** this work,using density functional theory,we investigate the effect of high pressure on the optical absorption behavior of aβ-FeSi_2（100）/Si（001） interface with some Si *** the pressure increases,the optical absorption peak down-shifts firstly,reach minimum values,and then un-shifts *** electronic orbital analysis indicates that the electronic transition between the highest occupied states and the lowest unoccupied states mainly originate from Fe atoms at the interface *** analysis discloses that the Si（001） slab partially offsets the pressure exerted on theβ-FeSi_2（100） interface,but this effect will become weaker with further increasing pressure,and this physical mechanism plays an important role in its optical absorption behavior.

关键词： β-FeSi2 (100)/Si (001) interface optical absorption electronic structure high-pressure

Absorptive Nonlinearity in Er-Doped optical Fiber

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Wuhan University Journal of Natural Sciences 1999年第2期4卷 56-59页

作者： Song, Qian Li, Ji-xing Zhang, Yuan-cheng Wuhan Univ Wuhan China

optical absorptive nonlinearity in Er doped optical fiber has been discussed and measured at the window wavelength 1.55 μm for optical communications firstly. It is proposed that the mechanism of this absorptive nonlinearity is the induced absorption. The first order nonlinear absorptive coefficient and the imaginary part and the complex value of the third order susceptibility at that wavelength are obtained from the measured absorptive nonlinearity.

关键词： optical nonlinearity Er doped fiber optical absorption

optical properties of InN films grown by MOCVD

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Frontiers of Optoelectronics 2008年第Z2期1卷 341-344页

作者： Jieying KONG Bin LIU Rong ZHANG Zili XIE Yong ZHANG Xiangqian XIU Youdou ZHENG Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University National Laboratory of Solid State Microstructures Nanjing University

By means of optical absorption, photoluminescence(PL), Raman scattering and ellipsometry, optical properties of indium nitride(InN) films grown by metal organic chemical vapor deposition(MOCVD) are investigated. Through absorption and PL measurements, it is proven that the band gap of high quality InN is 0.68 eV,which agrees with the recently reported value, 0.7 eV. By analysis of the Raman scattering spectrum, the comparatively low background concentration of electron results in a smaller band gap value. The transition energy of wurtzite InN at critical point is determined by ellipsometric spectra. In addition, the complex refractive index of InN at energy ranging from 0.65 to 4.0 eV is obtained for the first time.

关键词： indium nitride (InN) optical absorption photoluminescence (PL) ellipsometry metal organic chemical vapor deposition (MOCVD)

A new two-dimensional Te Se_2 semiconductor: indirect to direct band-gap transitions

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Science China Materials 2017年第8期60卷 747-754页

作者：吴伯朝尹久仁丁燕怀张平 Institute of Rheological Mechanics Xiangtan University College of Civil Engineering & Mechanics Xiangtan University

A novel two-dimensional（2D） Te Se_2 structure with high stability is predicted based on the first-principles calculations. As a semiconductor, the results disclose that the monolayer Te Se_2 has a wide-band gap of 2.392 e V. Interestingly, the indirect-band structure of the monolayer Te Se_2 transforms into a direct-band structure under the wide biaxial strain（0.02–0.12）. The lower hole effective mass than monolayer black phosphorus portends a high carrier mobility in Te Se_2 sheet. The optical properties and phonon modes of the few-layered Te Se_2 were characterized. The few-layer Te Se_2 shows a strong optical anisotropy. Specially, the calculated results demonstrate that the multilayer Te Se_2 has a wide range of absorption wavelength. Our result reveals that Te Se_2 as a novel 2D crystal possesses great potential applications in nanoscale devices, such as high-speed ultrathin transistors, nanomechanics sensors, acousto-optic deflectors working in the UV-vis red region and optoelectronic devices.

关键词： Te Se2 first-principles calculations direct band gap phonon modes optical absorption

Structure-Property Relations in xWO3-0.31P2O5-0.31B2O3-（0.38-x）Cs2O （0.01 ≤ x ≤0.28） Glasses by IR, UV and EPR Spectroscopic Studies

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Journal of Chemistry and Chemical Engineering 2011年第4期5卷 369-375页

作者： Bidhu Bhusan Das Ayyacannou Srinivassan Murugesan Yogapriya Department of Chemistry Pondicherry University Pondicherry 605 014 India

Glasses in the series of xWO3-0.31P2O5-0.31B2O3-（0.38-x）Cs2O （0.01 ≤ x ≤0.28）（G1-G4： x= 0.01, 0.1, 0.19, 0.28） were prepared by sol-gel method. Glassy phase in the samples were ascertained by powder X-ray diffraction pattern. Differential scanning calorimetry （DSC） traces of the samples show glass transition temperature Tg, in the range 247-253 ℃. IR spectra at 300 K of G1-G4 show the presence of [WO6], [WO4], [PO4]^3-, [PO3]^2-, [BO4]^＋, [BO3] units in the glass matrix. Observed electron paramagnetic resonance （EPR） lineshapes show two signals with very different intensities which are associated with W^5＋（5d^1） and Mo^5＋（4d^1）（impurity） paramagnetic sites. Signal with values ofg factors in the range 1.68 〈 g⊥ 〈 1.72 and 1.58 〈 gⅡ 〈 1.62 are due to W^5＋ ions present in axially distorted octahedral symmetry. The optical absorption spectra show that the W^5＋ ions have pyramidal coordination, involving a tungstyl ion WO^3＋（C4v symmetry）. EPR and optical studies suggest the existence of blocks of octahedra linked by tungsten clusters.

关键词： Sol-gel method oxide glasses W^5+ ion EPR small polaron optical absorption

Fiber Methane Gas Sensor and Its Application in Methane Outburst Prediction in Coal Mine

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Journal of Electronic Science and Technology of China 2008年第4期6卷 373-376页

作者： Jia-Sheng Ni Jun Chang Tong-Yu Liu Yan-Fang Li Yan-Jie Zhao Qian Wang LaserInstitute Shandong Academy of Science Jinan 250014 China School of Information Science andTechnology Shandong University Jinan 250 I00 China.

Fiber optic methane gas detecting system based on distributed feedback （DFB） laser wavelength scanning technique is demonstrated. Wavelength scan of methane absorption peak at 1665.9 nm is realized by saw tooth modulation of current which is injected to DFB laser. A reference methane gas cell is used to find the methane absorption peak around 1666 nm, and normalization is used to reduce the outside affection such as power drift, fiber loss. Concentration is got by arithmetic processing absorption coefficient of the methane gas. In-situ test is carried out in coal mine and long time precision of 0.05% is achieved. Some spot data of coal mine is introduced. By the system, methane outburst can be measured.

关键词： Methane outburst prediction optical absorption wavelength scan.

absorption spectra of C_(60) and C_(70) thin films

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Science China Mathematics 1996年第8期39卷 864-875页

作者：周维亚解思深钱生法周棠赵日安王刚钱露茜李文治 Institute of Physics Chinese Academy of Sciences Beijing 100080 China Department of Physics the Central University of Nationality Beijing 100087 China.

The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtained. The optical transitions for the Cm and Cw thin films are analyzed according to the molecular orbital model. The weak absorption spectra of the fullerenes are similar to that of amorphous silicon. The optical energy gaps are given by Tauc’s plots as 1.75 and 1.65eV for C60 and C70 thin films, respectively. The disorders in the fullerene films, which resulted in band-tail state or defect state, are indicated by Urbach edge and sub-gap absorption. It is the disorder that brought the difficulty in determination of the energy gap for fullerenes. The effects of the deflection medium and substrate on the weak absorption spectra of fullerene films are also discussed.

关键词： C_(60) C_(70) thin film optical absorption photo thermal deflection spectroscopy.

Femtosecond laser-induced periodic structures:mechanisms, techniques, and applications

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Opto-Electronic Science 2022年第6期1卷 11-31页

作者： Yuchan Zhang Qilin Jiang Mingquan Long Ruozhong Han Kaiqiang Cao Shian Zhang Donghai Feng Tianqing Jia Zhenrong Sun Jianrong Qiu Hongxing Xu State Key Laboratory of Precision Spectroscopy School of Physics and Materials ScienceEast China Normal UniversityShanghai 200062China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China State Key Laboratory of optical Instrumentation Zhejiang UniversityHangzhou 310027China

Over the past two decades,femtosecond laser-induced periodic structures(femtosecond-LIPSs)have become ubiquitous in a variety of materials,including metals,semiconductors,dielectrics,and ***-LIPSs have become a useful laser processing method,with broad prospects in adjusting material properties such as structural color,data storage,light absorption,and *** review discusses the formation mechanism of LIPSs,specifically the LIPS formation processes based on the pump-probe imaging *** pulse shaping of a femtosecond laser in terms of the time/frequency,polarization,and spatial distribution is an efficient method for fabricating high-quality *** LIPS applications are also briefly *** last part of this paper discusses the LIPS formation mechanism,as well as the high-efficiency and high-quality processing of LIPSs using shaped ultrafast lasers and their applications.

关键词： laser-induced periodic structures(LIPSs) formation mechanisms femtosecond pulse shaping pump-probe imaging structural color birefringent effects optical absorption photoluminescence