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Linear dichroism transition and polarization-sensitive photodetector of quasi-one-dimensional palladium bromide
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作者 朱万里 甄伟立 +5 位作者 牛瑞 焦珂珂 岳智来 胡慧杰 薛飞 张昌锦 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第6期532-539,共8页
Perpendicular optical reversal of the linear dichroism transition has promising applications in polarization-sensitive optoelectronic devices. We perform a systematical study on the in-plane optical anisotropy of quas... Perpendicular optical reversal of the linear dichroism transition has promising applications in polarization-sensitive optoelectronic devices. We perform a systematical study on the in-plane optical anisotropy of quasi-one-dimensional PdBr_(2) by using combined measurements of the angle-resolved polarized Raman spectroscopy(ARPRS) and anisotropic optical absorption spectrum. The analyses of ARPRS data validate the anisotropic Raman properties of the PdBr_(2) flake.And anisotropic optical absorption spectrum of PdBr_(2) nanoflake demonstrates distinct optical linear dichroism reversal. Photodetector constructed by PdBr_(2) nanowire exhibits high responsivity of 747 A·W^(-1) and specific detectivity of 5.8×10^(12) Jones. And the photodetector demonstrates prominent polarization-sensitive photoresponsivity under 405-nm light irradiation with large photocurrent anisotropy ratio of 1.56, which is superior to those of most of previously reported quasi-one-dimensional counterparts. Our study offers fundamental insights into the strong optical anisotropy exhibited by PdBr_(2), establishing it as a promising candidate for miniaturization and integration trends of polarization-related applications. 展开更多
关键词 linear dichroism reversal polarization sensitivity ANISOTROPY polarized photodetector
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Orientation of Pigments in the Isolated PhotosystemⅡSub-core Reaction Center CP47/D1/D2/Cyt b-559 Complexes:A Linear Dichroism Study 被引量:3
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作者 侯建敏 Dominique DEJONGHE +2 位作者 单际修 李良璧 匡廷云 《Acta Botanica Sinica》 CSCD 2000年第12期1211-1214,共4页
Linear dichroism (LD) spectroscopy is an important technique in the study of the orientation and organization of pigments in the photosynthetic membrane complexes in vivo and in vitro . In this work, the orient... Linear dichroism (LD) spectroscopy is an important technique in the study of the orientation and organization of pigments in the photosynthetic membrane complexes in vivo and in vitro . In this work, the orientation of the pigments in the isolated photosystem Ⅱ (PSⅡ) sub_core reaction center complexes was analyzed and characterized by means of low temperature absorption and LD spectroscopy. The preparations containing different amounts of CP47 isolated from spinach (Spinacia oleracea L.) chloroplast were used in order to investigate the orientation of pigments in the PSⅡ sub_core CP47/D1/D2/Cyt b_559 (CP47/D1/D2) complexes. Chlorophyll a (Chl a) absorbing at 680 nm in CP47/D1/D2/Cyt b_559 complex showed an orientation of the Q y transition parallel to the membrane plane. It is proposed that there are two forms of β_carotene (β_Car) in CP47/D1/D2/Cyt b_559 complex, denoted as β_Car (Ⅰ) and β_Car (Ⅱ), with different orientations, β_Car (Ⅰ) at 470 and 505 nm is roughly parallel to the membrane plane, and β_Car (Ⅱ) at 460 and 490 nm seems to be perpendicular orientation. Upon the photoinhibitory experiment β_Car (Ⅱ) was found to be photosensitive and easily photodamaged. It also showed that the positive LD signal observed at 680 nm was quite complicated. This signal is tentatively attributed to P680 and some Chl a of antenna in CP47 protein based upon our measurements. 展开更多
关键词 orientation of pigments photosystemⅡ linear dichroism spectroscopy PHOTOINHIBITION
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基于悬链线结构的多功能二向色性超构表面
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作者 蓝翔 邓钦荣 +4 位作者 张汶婷 崔恒瑜 唐紫依 胡杰 黄奕嘉 《太赫兹科学与电子信息学报》 2024年第10期1073-1080,共8页
超构表面是一种由亚波长单元结构组成的人工表面,展现出巨大的电磁波操纵潜力,悬链线电磁学为超构表面的设计提供了新的思路和方法。本文提出一种基于悬链线结构的多功能二向色性超构表面,能够在不同方向上实现对电磁波的选择吸收。仿... 超构表面是一种由亚波长单元结构组成的人工表面,展现出巨大的电磁波操纵潜力,悬链线电磁学为超构表面的设计提供了新的思路和方法。本文提出一种基于悬链线结构的多功能二向色性超构表面,能够在不同方向上实现对电磁波的选择吸收。仿真结果显示,该器件可在红外区域实现92%的线性二色性(LD)和96%的圆二色性(CD)。这两种功能仅需改变电磁波的入射方向就可同时实现,且两种功能在一定入射角范围内均具有较高的效率。此外,还分析了不同几何参数对吸收性能的影响,以及实现不同电磁波选择吸收的物理机制。该超构表面具有结构简单、便于集成以及应用范围广的优点,在成像、传感和光谱等领域具有潜在的应用前景。 展开更多
关键词 超构表面 悬链线 线性二色性 圆二色性 左旋圆偏振 右旋圆偏振 吸收器
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UV-Polarizing Linear Polyyne Molecules Aligned in PVA
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作者 R. Sata H. Suzuki +3 位作者 N. Ueno Y. Morisawa M. Hatanaka T. Wakabayashi 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2019年第2期175-181,I0002,共8页
Electronic absorption bands of conjugated linear carbon chain molecules, namely polyynes H(C≡C)nH (n=5-7), are exploited to devise light-polarizing films applicable to the UV. Laser ablated polyynes are separated in ... Electronic absorption bands of conjugated linear carbon chain molecules, namely polyynes H(C≡C)nH (n=5-7), are exploited to devise light-polarizing films applicable to the UV. Laser ablated polyynes are separated in size and dispersed in a film of polyvinyl alcohol (PVA), which is stretched to align the trapped linear polyyne molecules inside. As a nature of the structural anisotropy, transition dipole of the UV absorption for polyyne molecules is in parallel with the molecular axis and the absorption occurs only for the electromagnetic wave having the amplitude of its electric vector along the molecular axis. Aligned and fixed orientationally in the solid PVA film, polyyne molecules act as selective absorbers of one of the polarization components of incident light at particular wavelength. Using a light source of linearly polarized UV light, whose direction of polarization is rotatable, angular dependence of the absorption intensity is investigated for the stretched PVA film containing aligned polyyne molecules and analyzed in terms of an order parameter in the theory of linear dichroism. 展开更多
关键词 Polyyne UV absorption Polyvinyl alcohol linear dichroism linearly polarized light POLARIZER
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一维双链钙钛矿C_(5)H_(16)N_(2)Pb_(2)I_(6)的光学各向异性(特邀)
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作者 王海珍 程雪 +1 位作者 林庭浩 李德慧 《光子学报》 EI CAS CSCD 北大核心 2023年第3期157-165,共9页
研究了一维双链钙钛矿材料C_(5)H_(16)N_(2)Pb_(2)I_(6)的光学各向异性。采用水相法合成了一维双链钙钛矿C_(5)H_(16)N_(2)Pb_(2)I_(6)晶体,采用光谱对其进行表征,其荧光发射的线性二色比可达17.4,高于已报道的一维单链C4H14N2PbI4钙钛... 研究了一维双链钙钛矿材料C_(5)H_(16)N_(2)Pb_(2)I_(6)的光学各向异性。采用水相法合成了一维双链钙钛矿C_(5)H_(16)N_(2)Pb_(2)I_(6)晶体,采用光谱对其进行表征,其荧光发射的线性二色比可达17.4,高于已报道的一维单链C4H14N2PbI4钙钛矿。表明降低晶体的对称性可用于提高光学各向异性。进一步通过KramersKronig关系获得钙钛矿的复介电常数及其双折射和二色性,其中二色性和双折射分别达到了1.5和1.3。 展开更多
关键词 一维 双链钙钛矿 各向异性 二色性 双折射 线性二色比
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10,12-双炔廿三酸盐的LB膜特性研究 被引量:1
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作者 白玉白 李丽华 +5 位作者 王雅茹 汤心颐 李铁津 汤大新 董玺娟 王卉 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 1991年第12期1651-1654,共4页
本文合成了10,12-双炔廿三酸,并用其在Si、SiO_2、CaF_2等基片上沉积了LB膜,结果表明,10,12-双炔廿三酸的镉盐成膜更稳定。这种LB膜在紫外光辐照下很快聚合,聚合前后的紫外-可见吸收光谱发生规律性的变化,并保持层状结构,等同周期稍变... 本文合成了10,12-双炔廿三酸,并用其在Si、SiO_2、CaF_2等基片上沉积了LB膜,结果表明,10,12-双炔廿三酸的镉盐成膜更稳定。这种LB膜在紫外光辐照下很快聚合,聚合前后的紫外-可见吸收光谱发生规律性的变化,并保持层状结构,等同周期稍变。通过红外吸收的二向色性分析,确定了该分子的取向。 展开更多
关键词 双炔廿三酸 光聚合 LB膜
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10,12-双炔廿三酸镉盐LB膜的FT-IR光谱 被引量:1
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作者 汤大新 董玺娟 +3 位作者 王卉 白玉白 李丽华 李铁津 《物理化学学报》 SCIE CAS CSCD 北大核心 1992年第3期394-397,共4页
近年来,由于LB膜在功能器件中(如光电子器件,微型电池、低维半导体、热释电探测器等)显示出了令人兴奋的应用前景,因此有越来越多的人致力于LB膜的研究工作.其中对LB膜的成膜质量的评价,特别是LB膜的分子取向问题,是一个非常引人关注的... 近年来,由于LB膜在功能器件中(如光电子器件,微型电池、低维半导体、热释电探测器等)显示出了令人兴奋的应用前景,因此有越来越多的人致力于LB膜的研究工作.其中对LB膜的成膜质量的评价,特别是LB膜的分子取向问题,是一个非常引人关注的问题.此外,对于碳原子数大于20,熔点小于45℃的系列双炔酸(R—C≡C—C≡C—R′)可以利用LB技术制备多层膜.这类LB膜在紫外光或电子束的作用下可以迅速发生聚合. 展开更多
关键词 LB膜 热稳定性 双炔酸镉盐
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Super-resolution fluorescence polarization microscopy 被引量:4
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作者 Karl Zhanghao Juntao Gao +2 位作者 Dayong Jin Xuedian Zhang Peng Xi 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2018年第1期1-12,共12页
Fluorescence polarization is related to the dipole orientation of chromophores,making fuores-cence polarization microscopy possible to_reveal structures and functions of tagged cellularorganelles and biological macrom... Fluorescence polarization is related to the dipole orientation of chromophores,making fuores-cence polarization microscopy possible to_reveal structures and functions of tagged cellularorganelles and biological macromolecules.Several recent super resolution techniques have beenapplied to fluorescence polarization microscopy,achieving dipole measurement at nanoscale.In this review,we summarize both difraction limited and super resolution fluorescence polari-zation microscopy techniques,as well as their applications in biological imaging. 展开更多
关键词 Fluorescence polarization microscopy super resolution fluorescence anisotropy linear dichroism polarization modulation
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PM-SP-LB多层膜中BR分子的有序定向排列
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作者 王敖金 胡坤生 +3 位作者 谈曼琪 孙永泰 李津如 江龙 《生物物理学报》 CAS CSCD 北大核心 1992年第2期189-194,共6页
用垂直转移法在石英片上制成的PM—SP—LB多层膜的可见区吸收谱表明吸收峰峰位与成膜液一致,均在574nm左右,比PM水悬浮液的吸收峰位略有红移;稳态线二色性表明,除PM碎片平躺在多层膜平面内外,在提拉时的竖直方向存在BR的取向优势,优势... 用垂直转移法在石英片上制成的PM—SP—LB多层膜的可见区吸收谱表明吸收峰峰位与成膜液一致,均在574nm左右,比PM水悬浮液的吸收峰位略有红移;稳态线二色性表明,除PM碎片平躺在多层膜平面内外,在提拉时的竖直方向存在BR的取向优势,优势率约为0.51左右;同时还表明,25mN/m条件下制备的PM—SP—LB多层膜中BR分子的视黄醛生色团的跃迁矩与膜平面法向所成的角接近于天然紫膜中的值。 展开更多
关键词 线二色性 菌紫质 取向排列 紫膜
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三链核酸poly(U)·poly(A)·poly(U)主链的振动位移
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作者 孟耀勇 刘桂强 刘颂豪 《光谱实验室》 CAS CSCD 2003年第6期803-806,共4页
基于三链核酸 poly(U)· poly(A)·poly(U)的螺旋对称性 ,利用晶格动力学方法 ,计算了三链核酸分子 poly(U)·poly(A)·poly(U)主链振动的本征矢 ,探讨了振动位移矢量和线二色光谱的关系。结果表明 ,对应着磷酸双氧的... 基于三链核酸 poly(U)· poly(A)·poly(U)的螺旋对称性 ,利用晶格动力学方法 ,计算了三链核酸分子 poly(U)·poly(A)·poly(U)主链振动的本征矢 ,探讨了振动位移矢量和线二色光谱的关系。结果表明 ,对应着磷酸双氧的反对称振动谱线可以用于直接确定磷酸根的取向 ,精度大约为 1°。其他谱线必须通过对分子的简正分析来帮助确定分子的结构。 展开更多
关键词 三链核酸 poly(U)·poly(A)·poly(U) 振动位移 晶格动力学 线二色光谱 螺旋对称
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同聚DNA分子poly(dA)·poly(dT)主链的振动位移
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作者 金京林 孟耀勇 《激光生物学报》 CAS CSCD 2007年第6期698-701,共4页
基于同聚DNA分子poly(dA).poly(dT)的螺旋对称性,利用晶格动力学方法,计算了DNA分子poly(dA).poly(dT)主链振动的本征矢,探讨了振动位移矢量和线二色光谱的关系。结果表明,对应着磷酸双氧的反对称振动谱线可以用于直接确定磷酸根的取向... 基于同聚DNA分子poly(dA).poly(dT)的螺旋对称性,利用晶格动力学方法,计算了DNA分子poly(dA).poly(dT)主链振动的本征矢,探讨了振动位移矢量和线二色光谱的关系。结果表明,对应着磷酸双氧的反对称振动谱线可以用于直接确定磷酸根的取向,精度小于1°。其它谱线必须通过对分子的简正分析来帮助确定分子的结构。 展开更多
关键词 poly(dA)·poly(dT) 晶格动力学 线二色光谱
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Negative dependence of surface magnetocrystalline anisotropy energy on film thickness in Co_(33)Fe_(67) alloy
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作者 王得来 崔明启 +2 位作者 杨栋亮 董俊才 徐伟 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期409-412,共4页
In this work, the magnetocrystalline anisotropy energy(MAE) on the surface of FeCoalloy film is extracted from x-ray magnetic linear dichroism(XMLD) experiments. The result indicates that the surface MAE value is nega... In this work, the magnetocrystalline anisotropy energy(MAE) on the surface of FeCoalloy film is extracted from x-ray magnetic linear dichroism(XMLD) experiments. The result indicates that the surface MAE value is negatively correlated with thickness. Through spectrum calculations and analysis, we find that besides the thickness effect, another principal possible cause may be the shape anisotropy resulting from the presence of interface roughness. These two factors lead to different electron structures on the fermi surface with different exchange fields, which produces different spin–orbit interaction anisotropies. 展开更多
关键词 magnetocrystalline anisotropy energy x-ray magnetic linear dichroism L_(2 3) edge ligand field multiplet
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基于深紫外激光-光发射电子显微技术的高分辨率磁畴成像 被引量:3
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作者 吕浩昌 赵云驰 +16 位作者 杨光 董博闻 祁杰 张静言 朱照照 孙阳 于广华 姜勇 魏红祥 王晶 陆俊 王志宏 蔡建旺 沈保根 杨峰 张申金 王守国 《物理学报》 SCIE EI CAS CSCD 北大核心 2020年第9期1-14,共14页
基于磁二色效应的光发射电子显微镜磁成像技术是研究薄膜磁畴结构的一种重要研究手段,具有空间分辨率高、可实时成像以及对表面信息敏感等优点.以全固态深紫外激光(波长为177.3 nm;能量为7.0 eV)为激发光源的光发射电子显微技术相比于... 基于磁二色效应的光发射电子显微镜磁成像技术是研究薄膜磁畴结构的一种重要研究手段,具有空间分辨率高、可实时成像以及对表面信息敏感等优点.以全固态深紫外激光(波长为177.3 nm;能量为7.0 eV)为激发光源的光发射电子显微技术相比于传统的光发射电子显微镜磁成像技术(以同步辐射光源或汞灯为激发源),摆脱了大型同步辐射光源的限制;同时又解决了当前阈激发研究中由于激发光源能量低难以实现光电子直接激发的技术难题,在实验室条件下实现了高分辨磁成像.本文首先对最新搭建的深紫外激光-光发射电子显微镜系统做了简单介绍.然后结合超高真空分子束外延薄膜沉积技术,成功实现了L10-FePt垂直磁各向异性薄膜的磁畴观测,其空间分辨率高达43.2 nm,与利用X射线作为激发源的光发射电子显微镜磁成像技术处于同一量级,为后续开展高分辨磁成像提供了便利.最后,重点介绍了在该磁成像技术方面取得的一些最新研究成果:通过引入Cr的纳米"台阶",成功设计出FePt的(001)与(111)双取向外延薄膜;并在"台阶"区域使用线偏振态深紫外激光观测到了磁线二色衬度,其强度为圆二色衬度的4.6倍.上述研究结果表明:深紫外激光-光发射电子显微镜磁成像技术在磁性薄膜/多层膜体系磁畴观测方面具备了出色的分辨能力,通过超高真空系统与分子束外延薄膜制备系统相连接,可以实现高质量单晶外延薄膜制备、超高真空原位传输和高分辨磁畴成像三位一体的功能,为未来磁性薄膜材料的研究提供了重要手段. 展开更多
关键词 光发射电子显微镜 深紫外激光 磁圆/线二色 高分辨磁成像
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某些环肽及其相应线型肽在不同溶剂中构象的CD谱研究 被引量:2
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作者 蒋云 苗振伟 +1 位作者 徐筱杰 唐有祺 《物理化学学报》 SCIE CAS CSCD 北大核心 1996年第1期91-95,共5页
We used CD spectroscopy to study the conformations of three cyclic peptides (CP10E: cyclo[Glu(OBz1)-Pro-Gly-Glu(OBzl), CP10K: cyclo[Lys(Z)-Pro Gly-Lys(Z)-Gly]2, CP12K: cyclo[Phe-Lys(Z)-Pro-Gly-Lys(Z)-Gly]2 and their c... We used CD spectroscopy to study the conformations of three cyclic peptides (CP10E: cyclo[Glu(OBz1)-Pro-Gly-Glu(OBzl), CP10K: cyclo[Lys(Z)-Pro Gly-Lys(Z)-Gly]2, CP12K: cyclo[Phe-Lys(Z)-Pro-Gly-Lys(Z)-Gly]2 and their correspon dent linear peptides (LP10E: Boc-[Glu(OBzl)-Pro-Gly-Glu(OBzl)-Gly]2-OPac, LP10K: Boc-[Lys(Z)-Pro-Lys(Z)-Pro]2-OMe, LP 12K: Bao- [-Lys(Z)-Pro-Gly-Lys(Z)-Gly]2- OMe) in three solvents of different polarity (chloroform, acetonitrile, 2,2,2-triliuroethanol), and it was found that all of linear and cyclicpeptides exist as γ-turn conformation in chloroform,however, in TFE & CH3CN solutions, the three linear peptides are in β Ⅱ-turn conformations. CP10E is β Ⅰ-turn conformation, CP10K & CP12K exist in more than one types of turn conformations. On the basis of our experiments, it was concluded: 1) In the presence of conformational constrained amino acids short linear peptides form obvious secondary structure, 2) The solvent polarity has influence on the peptide conformation and this influence on linear peptides is greater than that on cyclic peptides, 3) The backbone of cyclic peptide has constraint effect on its conformation and makes the secondary structure of cyclic peptide different from that of its relative linear peptide. This information might give some clues in the design of bioactive peptides with different receptor selectivity. 展开更多
关键词 圆二色谱 环肽 线型肽 构象 CD谱
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气液界面超分子手性分布的原位二次谐波研究
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作者 王晓宇 李林 +3 位作者 林路 张贞 陆洲 郭源 《光学技术》 CAS CSCD 北大核心 2015年第6期511-514,共4页
界面超分子手性因其在材料、催化、生物等领域的应用前景得到了人们的广泛关注。卟啉(porphyrin)衍生物因具有强的π-π堆垛能力、生物兼容性和出色的电子性能,常用于构建界面超分子结构。卟啉衍生物的表面超分子手性研究多数在固体基... 界面超分子手性因其在材料、催化、生物等领域的应用前景得到了人们的广泛关注。卟啉(porphyrin)衍生物因具有强的π-π堆垛能力、生物兼容性和出色的电子性能,常用于构建界面超分子结构。卟啉衍生物的表面超分子手性研究多数在固体基底上进行。利用二次谐波线二色谱方法分析卟啉衍生物在空气/水界面形成的超分子结构,通过界面层不同位置处产生的S偏振二次谐波强度随入射基频光偏振态的变化研究界面超分子结构的手性分布。实验表明,卟啉衍生物TPPS吸附在两亲分子CTAB在空气/水界面上形成的单层后会形成超分子结构,该结构具有手性,且手性的二维分布是非均匀的。 展开更多
关键词 非线性光学 手性 二次谐波的线二向色性 电偶极跃迁 磁偶极跃迁
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A family of high-temperature ferromagnetic monolayers with locked spin-dichroism-mobility anisotropy: MnNX and CrCX(X=Cl,Br,I;C=S,Se,Te) 被引量:5
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作者 Cong Wang Xieyu Zhou +3 位作者 Linwei Zhou Ning-Hua Tong Zhong-Yi Lu Wei Ji 《Science Bulletin》 SCIE EI CAS CSCD 2019年第5期293-300,共8页
Two-dimensional magnets have received increasing attention since Cr_2Ge_2Te_6 and CrI_3 were experimentally exfoliated and measured in 2017. Although layered ferromagnetic metals were demonstrated at room temperature,... Two-dimensional magnets have received increasing attention since Cr_2Ge_2Te_6 and CrI_3 were experimentally exfoliated and measured in 2017. Although layered ferromagnetic metals were demonstrated at room temperature, a layered ferromagnetic semiconductor with high Curie temperature(Tc) is yet to be unveiled. Here, we theoretically predicted a family of high Tcferromagnetic monolayers, namely MnNX and CrCX(X = Cl, Br and I; C = S, Se and Te). Their Tcvalues were predicted from over 100 K to near 500 K with Monte Carlo simulations using an anisotropic Heisenberg model. Eight members among them show semiconducting bandgaps varying from roughly 0.23 to 1.85 eV. These semiconducting monolayers also show extremely large anisotropy, i.e. ~10~1 for effective masses and ~10~2 for carrier mobilities, along the two in-plane lattice directions of these layers. Additional orbital anisotropy leads to a spin-locked linear dichroism, in different from previously known circular and linear dichroisms in layered materials.Together with the mobility anisotropy, it offers a spin-, dichroism-and mobility-anisotropy locking.These results manifest the potential of this 2D family for both fundamental research and high performance spin-dependent electronic and optoelectronic devices. 展开更多
关键词 Two-dimentional materials FIRST-PRINCIPLES calculation Strong MOBILITY ANISOTROPY Spin-locked linear dichroism High-temperature FERROMAGNETS Direct bandgap semic on ductor
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Strong in-plane optical anisotropy in 2D van der Waals antiferromagnet VOCl
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作者 Tianle Zhang Jiantao Du +9 位作者 Wenjun Wang Keming Wu Shuai Yue Xinfeng Liu Wanfu Shen Chunguang Hu Minghui Wu Zhe Qu Shengxue Yang Chengbao Jiang 《Nano Research》 SCIE EI CSCD 2023年第5期7481-7488,共8页
Two-dimensional(2D)van der Waals(vdW)magnetic materials with strong in-plane anisotropy can make possible novel applications such as optospintronics and strain sensors.In this work,the strong in-plane optical anisotro... Two-dimensional(2D)van der Waals(vdW)magnetic materials with strong in-plane anisotropy can make possible novel applications such as optospintronics and strain sensors.In this work,the strong in-plane optical anisotropy in 2D vdW antiferromagnet VOCl has been systematically investigated.The optical brightness and absorption coefficient exhibit evident periodic variation with the change of incident polarization,unveiling the strong in-plane anisotropic optical absorption.The Raman intensity in this material shows obvious dependence on the polarization angle of incident laser,demonstrating that the phonon properties possess strong in-plane anisotropy.Besides,we have also realized in-situ visualization of in-plane optical reflection anisotropy in this material.Moreover,the strong second harmonic generation(SHG)signal can only be detected when the incident polarization is along specific in-plane crystal orientations,illustrating the presence of strong in-plane nonlinear optical anisotropy.These findings will benefit the applications of VOCl in the field of polarization-dependent electronics and spintronics. 展开更多
关键词 two-dimensional material vanadium oxide chloride in-plane optical anisotropy linear dichroism nonlinear optics
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High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet 被引量:11
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作者 Jiahong Zhong Juan Yu +5 位作者 Lingkai Cao Cheng Zeng Junnan Ding Chunxiao Cong Zongwen Liu Yanping Liu 《Nano Research》 SCIE EI CAS CSCD 2020年第6期1780-1786,共7页
The extraordinary optical and electronic properties of anisotropic two-dimensional materials,such as black phosphorus,ReS2,and GeSe,enable them a promising component of polarization-sensitive photodetectors.However,th... The extraordinary optical and electronic properties of anisotropic two-dimensional materials,such as black phosphorus,ReS2,and GeSe,enable them a promising component of polarization-sensitive photodetectors.However,these applications are significantly limited by the challenges of air-stability,response time,and linearly dichroic ratio.Interestingly,palladium diselenide(PdSe2)with high air stability is an emerging material that has robust in-plane anisotropy induced by its asymmetric pentagonal lattice structure.We have successfully prepared a few-layer PdSe2 using micromechanical exfoliation,and here we demonstrate the strong linear dichroism behavior of PdSe2 by polarization-resolved absorption spectra measurements.Such unique linear dichroism,endows the PdSe2 photodetector powerful ability to detect polarized light.The photodetector based on 5L PdSe2,as tested with polarization-dependent photocurrent mapping,exhibited competitive capability to detect polarized light,achieving a significant photocurrent on/off ratio(>10^2),the quite fast response time(<11 ms)and robust linearly dichroic ratios(/max//min≈1.9 at 532 nm).These results are essential advance in the development of polarization-sensitive photodetector,a crucial step towards opening up a new avenue for the application of 2D optoelectronic devices. 展开更多
关键词 PdSe2 ANISOTROPY polarization-sensitive linear dichroism
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Investigation of black phosphorus as a nano-optical polarization element by polarized Raman spectroscopy 被引量:5
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作者 Nannan Mao Shishu Zhang +6 位作者 Jinxiong Wu Huihui Tian Juanxia Wu Hua Xu Hailin Peng Lianming Tong Jin Zhang 《Nano Research》 SCIE EI CAS CSCD 2018年第6期3154-3163,共10页
Manipulating the polarization of light at the nanoscale is essential for the development of nano-optical devices. Owing to its corrugated honeycomb structure, two-dimensional (2D) layered black phosphorus (BP) exh... Manipulating the polarization of light at the nanoscale is essential for the development of nano-optical devices. Owing to its corrugated honeycomb structure, two-dimensional (2D) layered black phosphorus (BP) exhibits outstanding in-plane optical anisotropy with distinct linear dichroism and optical birefringence in the visible region, which are superior characteristics for ultrathin polarizing optics. Herein, taking advantage of polarized Raman spectroscopy, we demonstrate that layered BP with a nanometer thickness can remarkably alter the polarization state of a linearly-polarized laser and behave as an ultrathin optical polarization element in a BP-Bi2Se3 stacking structure by inducing the exceptionally polarized Raman scattering of isotropic Bi2Se3. Our findings provide a promising alternative for designing novel polarization optics based on 2D anisotropic materials, which can be easily integrated in micro- sized all-optical and optoelectronic devices. 展开更多
关键词 black phosphorus polarizing optics linear dichroism BIREFRINGENCE two-dimensional layered crystals
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Understanding angle-resolved polarized Raman scattering from black phosphorus at normal and oblique laser incidences 被引量:3
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作者 Miao-Ling Lin Yu-Chen Leng +7 位作者 Xin Cong Da Meng Jiahong Wang Xiao-Li Li Binlu Yu Xue-Lu Liu Xue-Feng Yu Ping-Heng Tan 《Science Bulletin》 SCIE EI CAS CSCD 2020年第22期1894-1900,M0004,共8页
The selection rule for angle-resolved polarized Raman(ARPR)intensity of phonons from standard grouptheoretical method in isotropic materials would break down in anisotropic layered materials(ALMs)due to birefringence ... The selection rule for angle-resolved polarized Raman(ARPR)intensity of phonons from standard grouptheoretical method in isotropic materials would break down in anisotropic layered materials(ALMs)due to birefringence and linear dichroism effects.The two effects result in depth-dependent polarization and intensity of incident laser and scattered signal inside ALMs and thus make a challenge to predict ARPR intensity at any laser incidence direction.Herein,taking in-plane anisotropic black phosphorus as a prototype,we developed a so-called birefringence-linear-dichroism(BLD)model to quantitatively understand its ARPR intensity at both normal and oblique laser incidences by the same set of real Raman tensors for certain laser excitation.No fitting parameter is needed,once the birefringence and linear dichroism effects are considered with the complex refractive indexes.An approach was proposed to experimentally determine real Raman tensor and complex refractive indexes,respectively,from the relative Raman intensity along its principle axes and incident-angle resolved reflectivity by Fresnel’s law.The results suggest that the previously reported ARPR intensity of ultrathin ALM flakes deposited on a multilayered substrate at normal laser incidence can be also understood based on the BLD model by considering the depth-dependent polarization and intensity of incident laser and scattered Raman signal induced by both birefringence and linear dichroism effects within ALM flakes and the interference effects in the multilayered structures,which are dependent on the excitation wavelength,thickness of ALM flakes and dielectric layers of the substrate.This work can be generally applicable to any opaque anisotropic crystals,offering a promising route to predict and manipulate the polarized behaviors of related phonons. 展开更多
关键词 Angle-resolved polarized Raman scattering Anisotropic layered material BIREFRINGENCE linear dichroism Real Raman tensor Complex refractive index
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