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Free-Space Beam Steering with Twisted Bilayer Photonic Crystal Slabs 利用扭曲双层光子晶体板实现自由空间光束转向
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1021/acsphotonics.4c00736
Beicheng Lou, Haoning Tang, Fan Du, Guangqi Gao, Eric Mazur, Shanhui Fan
We numerically demonstrate the inverse design of a structure for free-space beam steering, based on twisted bilayer photonic crystal slabs. The structure consists of two photonic crystal slabs that can be twisted in plane relative to each other. By rotating the two slabs in plane, one can diffract normally incident light into different outgoing angles, maintaining most of the power in the desired outgoing channel. Our work shows a novel way of achieving free-space beam steering in a compact structure and indicates the important opportunities in inverse design based on bilayer photonic crystal structures.
我们用数值演示了一种基于扭曲双层光子晶体板的自由空间光束转向结构的逆向设计。该结构由两块可在平面上相对扭曲的光子晶体板组成。通过在平面上旋转这两块板,可以将正常入射光衍射到不同的出射角度,从而在所需的出射通道中保持大部分功率。我们的工作展示了一种在紧凑结构中实现自由空间光束转向的新方法,并指出了基于双层光子晶体结构的反向设计的重要机遇。
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引用次数: 0
Magnetic Field Effect on Spin-Polarized Excitons in Two-Dimensional Cesium Lead Bromide Perovskites 磁场对二维溴化铯铅包晶石中自旋极化激子的影响
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1021/acsphotonics.4c00513
Ruiqin Huang, Jingnan Hu, Zhuo Yang, Yoshimitsu Kohama, Xinhui Zhang, Xixiang Zhu, Huakun Zuo, Jinyu Zou, Tao Peng, Liang Li, Gang Xu, Yibo Han
Spin–orbital coupling (SOC) in asymmetric two-dimensional semiconductors exhibits the Rashba effect. This coupling also shows spin-selective electric and optical properties, which are crucial for spintronic applications. Herein, we report the behavior of large circularly polarized excitonic photoluminescence in a two-dimensional lead halide perovskite in a magnetic field. The degree of circular polarization was found to be anisotropic and also dependent on the number of atomic layers, with saturation values of 31 and 3.5% at 4.2 and 200 K, respectively. The results were well simulated through theoretical calculations, where stronger Rashba SOC induced higher circular polarization in an external magnetic field. This high circular polarization at elevated temperatures, combined with the high light-emission efficiency, highlights the application potential of perovskite semiconductors in spin-photonic devices.
不对称二维半导体中的自旋轨道耦合(SOC)具有拉什巴效应。这种耦合还显示出自旋选择性的电学和光学特性,这对自旋电子应用至关重要。在此,我们报告了二维卤化铅包晶石在磁场中的大圆极化激子光致发光行为。研究发现,圆极化的程度是各向异性的,而且与原子层数有关,在 4.2 K 和 200 K 时的饱和值分别为 31% 和 3.5%。理论计算很好地模拟了这一结果,在外加磁场中,较强的拉什巴 SOC 会诱发较高的圆极化。这种高温下的高圆极化与高发光效率相结合,凸显了自旋光子器件中包晶石半导体的应用潜力。
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引用次数: 0
Mapping Optical Lateral Forces on the Poincaré Sphere 绘制 Poincaré 球上的光学侧向力图
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1021/acsphotonics.4c00666
Yuchen Zhu, Sha Xiong, Chengxing Lai, Zeyong Wei, Chengfeng Lu, Yujiang He, Qinghua Song, Pin Chieh Wu, Hong Luo, Zhanshan Wang, Lingyun Xie, Yuzhi Shi, Xinbin Cheng
Optical lateral forces (OLFs) play progressively important roles in optical manipulation, finding numerous applications in enantioselective sorting and sensing. Probing OLFs on achiral particles is also essential in interpreting extraordinary light–matter interactions. Recent advances have shown that the OLF can emerge from the transverse Belinfante spin momentum (BSM) and get maximum values when the light is circularly polarized. Here, by searching the Poincaré sphere, we find that the optical gradient force and radiation pressure correlate strongly with the ellipticity and azimuthal angles on the Poincaré sphere, which may exceed the OLF in a focused line-shaped beam. Consequently, the total lateral force may reach its maximum under the elliptical polarization rather than the circular polarization. Meanwhile, the ellipticity angle corresponding to the maximum force varies significantly with the particle size and its refractive index. Our work unravels a novel and efficient way to harness optical forces in a full-polarization manner and provides a new playground for various biophysical applications.
光学侧向力(OLFs)在光学操纵中发挥着越来越重要的作用,在对映体选择性分选和传感中得到广泛应用。探测非手性粒子上的光学侧向力对于解释非同寻常的光-物质相互作用也至关重要。最近的研究进展表明,OLF 可以从横向贝林芬特自旋动量(BSM)中产生,并在光被圆偏振时获得最大值。在这里,通过搜索波恩卡莱球,我们发现光梯度力和辐射压力与波恩卡莱球上的椭圆度和方位角密切相关,在聚焦线形光束中可能超过 OLF。因此,在椭圆偏振而不是圆偏振情况下,总侧向力可能达到最大值。同时,与最大力相对应的椭圆度角随颗粒大小和折射率的变化而显著不同。我们的研究揭示了一种以全偏振方式利用光学力的新颖而有效的方法,为各种生物物理应用提供了一个新的舞台。
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引用次数: 0
Ultrahigh Visible-Transparency, Submicrometer, and Polymer-Free Radiative Cooling Meta-Glass Coating for Building Energy Saving 用于建筑节能的超高透光率、亚微米级、无聚合物辐射冷却元玻璃涂层
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1021/acsphotonics.4c00981
Shilv Yu, Jae-Seon Yu, Zihe Chen, Qinghe Li, Zhaochen Wang, Xiaobing Luo, Sun-Kyung Kim, Run Hu
Glass windows are the most energy-inefficient part of buildings, which triggers the ongoing chasing of energy-efficient transparent radiative cooling (TRC) metamaterials on glasses that simultaneously maintain high visible (VIS) transparency, block near-infrared (NIR) solar radiation, and emit thermal energy through the atmosphere window (AW). However, the stringent multispectral regulation remains challenging since it involves with huge parameter spaces and significant interactions among different bands. Additionally, most TRC metamaterials require a top ∼50 μm polymer for high emissivity in the AW, which will reduce the VIS transparency and suffer from aging issue. Here, we employ the deep reinforcement learning (DRL) method, leveraging its robust material screening and structure optimization capabilities, to design a five-layer submicrometer dielectric multilayer, composed of two stacked materials, as polymer-free TRC metamaterial on glass or meta-glass for short. Utilizing a plain glass substrate with high emission in the AW, our meta-glass demonstrates an ultrahigh angular-independent (<60°) VIS transmissivity against the state-of-the-art, i.e., 86% (92.7% in theory), with ∼48% NIR reflectivity and ∼89% AW emissivity in experiment. In outdoor experiments at ambient temperatures of ∼10 and ∼20 °C, with solar irradiances reaching around 780 and 850 W/m2, our meta-glass achieves a floor temperature reduction of 8.9 and 12.7 °C, respectively, compared to uncoated glass. Furthermore, we achieved customization of meta-glasses with varying transparency levels while maintaining high NIR reflectance by DRL. Our meta-glass exhibits an extraordinary building energy saving potential in most climate zones. This work provides a valuable reference for the advancement of TRC and the design of multispectral metamaterials.
玻璃窗是建筑物中最不节能的部分,这引发了人们对玻璃上节能透明辐射冷却(TRC)超材料的持续追逐,这种超材料可同时保持高可见光(VIS)透明度、阻挡近红外(NIR)太阳辐射,并通过大气窗(AW)发射热能。然而,严格的多光谱调节仍然具有挑战性,因为它涉及巨大的参数空间和不同波段之间的显著相互作用。此外,大多数 TRC 超材料都要求在顶部使用 ∼50 μm 的聚合物以获得 AW 中的高发射率,这将降低 VIS 透明度并导致老化问题。在此,我们采用深度强化学习(DRL)方法,利用其强大的材料筛选和结构优化能力,设计了一种由两种堆叠材料组成的五层亚微米介电多层材料,作为玻璃上的无聚合物 TRC 超材料,简称超玻璃。我们的超玻璃使用了在 AW 中具有高发射率的普通玻璃基板,在实验中与最先进的技术相比,具有超高的与角度无关的(60°)可见光透过率,即 86%(理论上为 92.7%),近红外反射率为 48%,AW 发射率为 89%。在环境温度分别为 10 ∼ 10 °C和 20 ∼ 20 °C、太阳辐照度分别为 780 W/m2 和 850 W/m2 的室外实验中,与未镀膜玻璃相比,我们的元玻璃分别降低了 8.9 °C和 12.7 °C的地板温度。此外,我们还通过 DRL 实现了不同透明度的元玻璃定制,同时保持了较高的近红外反射率。我们的元玻璃在大多数气候区都具有非凡的建筑节能潜力。这项工作为 TRC 的发展和多光谱超材料的设计提供了宝贵的参考。
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引用次数: 0
Evolution and Combination of Light Line Singularities in Planar Multilayers 平面多层膜中光线奇点的演变与组合
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1021/acsphotonics.4c00705
Jiawei Wang, Mengqi Liu, Tianji Liu, Weijin Chen, Yue Ma, Qiuyu Wang, Wei Li
In recent decades, optical singularities have been extensively investigated with intriguing phenomena and rich physics, including bound states in the continuum (BICs), exceptional points, and optical vortices. However, the behaviors of singularities at the light line have largely been ignored. Here, we reveal the generation and evolution of light line singularities and predict their distributions in planar configurations. Remarkably, when a system simultaneously supports light line singularities and BICs at the same point in the ω–kx space, combined singularities are generated. The combined singularities (including combined BICs) at both 0° and 90° show robust higher Q properties against the perturbation of the system compared with isolated BICs or light line singularities. For example, in a lossy system, the topological phase singularity pairs (TPSPs) resulting from combined singularities have 3 orders of magnitude larger Q factors than TPSPs from isolated ones. Furthermore, the positions of these TPSPs can be dynamically manipulated by inserting a monolayer graphene. Our findings expand the classification of optical singularities at the light line and enhance Q factors by combining singularities with potential applications such as nonlinear optics, lasers, and sensors.
近几十年来,人们对光学奇点进行了广泛的研究,其中包括连续体中的束缚态(BICs)、异常点和光学旋涡等有趣的现象和丰富的物理学内容。然而,人们在很大程度上忽视了光线奇点的行为。在这里,我们揭示了光线奇点的产生和演化,并预测了它们在平面构型中的分布。值得注意的是,当一个系统在ω-kx空间的同一点同时支持光线奇点和BIC时,就会产生组合奇点。与孤立的 BIC 或光线奇点相比,在 0° 和 90° 处的组合奇点(包括组合 BIC)在系统的扰动下表现出更强的高 Q 特性。例如,在有损系统中,组合奇点产生的拓扑相位奇点对(TPSPs)比孤立奇点产生的拓扑相位奇点对的 Q 值大 3 个数量级。此外,这些拓扑相位奇点对的位置可以通过插入单层石墨烯进行动态操控。我们的发现扩展了光线处光学奇点的分类,并通过组合奇点提高了 Q 因子,具有潜在的应用价值,如非线性光学、激光和传感器。
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引用次数: 0
Ultraviolet-B Resonant-Cavity Light-Emitting Diodes with Tunnel Junctions and Dielectric Mirrors 带隧道结和介电镜的紫外线-B 谐振腔发光二极管
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1021/acsphotonics.4c00312
Estrella Torres, Joachim Ciers, Michael A. Bergmann, Jakob Höpfner, Sarina Graupeter, Massimo Grigoletto, Martin Guttmann, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund
We demonstrate the first electrically injected AlGaN-based ultraviolet-B resonant-cavity light-emitting diode (RCLED). The devices feature dielectric SiO2/HfO2 distributed Bragg reflectors enabled by tunnel junctions (TJs) for lateral current spreading. A highly doped n++-AlGaN/n++-GaN/p++-AlGaN TJ and a top n-AlGaN current spreading layer are used as transparent contacts, resulting in a good current spreading up to an active region mesa diameter of 120 μm. To access the N-face side of the device, the substrate is removed by electrochemically etching a sacrificial n-AlGaN layer, leading to a smooth underetched surface without evident parasitic etching in the n- and n++-doped layers of the device. The RCLEDs show a narrow emission spectrum with a full width at half-maximum (FWHM) of 4.3 nm compared to 9.4 nm for an ordinary LED and a more directional emission pattern with an angular FWHM of 52° for the resonance at 310 nm in comparison to ∼126° for an LED. Additionally, the RCLEDs show a much more stable emission spectrum with temperature with a red-shift of the electroluminescence peak of about ∼18 pm/K and a negligible change of the FWHM compared to LEDs, which shift ∼30 pm/K and show spectrum broadening with temperature. The demonstration of those devices, where a highly reflective mirror is spatially separated from an ohmic metal contact, opens up a new design space to potentially increase the poor light extraction efficiency in UV LEDs and is an important step toward electrically injected UV vertical-cavity surface-emitting lasers.
我们展示了首个电注入式氮化铝基紫外线-B 谐振腔发光二极管(RCLED)。该器件采用电介质 SiO2/HfO2 分布布拉格反射器,通过隧道结 (TJ) 实现横向电流扩散。高掺杂 n++-AlGaN/n++-GaN/p++-AlGaN TJ 和顶部 n-AlGaN 电流扩散层被用作透明接触,从而实现了高达 120 μm 的有源区介子直径的良好电流扩散。要进入器件的 N 面,需要通过电化学蚀刻牺牲 nAlGaN 层来移除基底,从而获得光滑的欠蚀刻表面,器件的 n 和 n++ 掺杂层中没有明显的寄生蚀刻。RCLED 的发射光谱较窄,半最大值全宽 (FWHM) 为 4.3 nm,而普通 LED 为 9.4 nm;发射模式更具方向性,310 nm 处共振的角 FWHM 为 52°,而 LED 为 126°。此外,RCLED 的发射光谱随温度的变化更为稳定,电致发光峰的红移约为∼18 pm/K,FWHM 的变化可忽略不计。在这些器件中,高反射镜与欧姆金属触点在空间上是分离的,这为提高紫外发光二极管的低光萃取效率开辟了新的设计空间,也是向电注入式紫外垂直腔表面发射激光器迈出的重要一步。
{"title":"Ultraviolet-B Resonant-Cavity Light-Emitting Diodes with Tunnel Junctions and Dielectric Mirrors","authors":"Estrella Torres, Joachim Ciers, Michael A. Bergmann, Jakob Höpfner, Sarina Graupeter, Massimo Grigoletto, Martin Guttmann, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund","doi":"10.1021/acsphotonics.4c00312","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c00312","url":null,"abstract":"We demonstrate the first electrically injected AlGaN-based ultraviolet-B resonant-cavity light-emitting diode (RCLED). The devices feature dielectric SiO<sub>2</sub>/HfO<sub>2</sub> distributed Bragg reflectors enabled by tunnel junctions (TJs) for lateral current spreading. A highly doped n<sup>++</sup>-AlGaN/n<sup>++</sup>-GaN/p<sup>++</sup>-AlGaN TJ and a top n-AlGaN current spreading layer are used as transparent contacts, resulting in a good current spreading up to an active region mesa diameter of 120 μm. To access the N-face side of the device, the substrate is removed by electrochemically etching a sacrificial n-AlGaN layer, leading to a smooth underetched surface without evident parasitic etching in the n- and n<sup>++</sup>-doped layers of the device. The RCLEDs show a narrow emission spectrum with a full width at half-maximum (FWHM) of 4.3 nm compared to 9.4 nm for an ordinary LED and a more directional emission pattern with an angular FWHM of 52° for the resonance at 310 nm in comparison to ∼126° for an LED. Additionally, the RCLEDs show a much more stable emission spectrum with temperature with a red-shift of the electroluminescence peak of about ∼18 pm/K and a negligible change of the FWHM compared to LEDs, which shift ∼30 pm/K and show spectrum broadening with temperature. The demonstration of those devices, where a highly reflective mirror is spatially separated from an ohmic metal contact, opens up a new design space to potentially increase the poor light extraction efficiency in UV LEDs and is an important step toward electrically injected UV vertical-cavity surface-emitting lasers.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":null,"pages":null},"PeriodicalIF":7.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141597454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spin-Dependent Exciton–Exciton Interactions in a Mixed Lead Halide Perovskite Crystal 混合卤化铅过氧化物晶体中自旋相关的激子-共生相互作用
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1021/acsphotonics.4c00499
Stefan Grisard, Artur V. Trifonov, Thilo Hahn, Tilmann Kuhn, Oleh Hordiichuk, Maksym V. Kovalenko, Dmitri R. Yakovlev, Manfred Bayer, Ilya A. Akimov
We investigate the two-pulse photon echo response of excitons in the mixed lead halide perovskite crystal FA0.9Cs0.1PbI2.8Br0.2 in dependence on the excitation intensity and polarization of the incident laser pulses. Using spectrally narrow picosecond laser pulses, we address localized excitons with long coherence times T2 ≈ 100 ps. This approach offers high sensitivity for the observation of excitation-induced changes in the homogeneous line width Γ2 = 2/T2 on the μeV scale. Through intensity-dependent measurements, we evaluate the increase of Γ2 by 10 μeV at an exciton density of 1017 cm–3 being comparable with the intrinsic line width of 14 μeV. We observe that the decay of the photon echo and its power dependence are sensitive to the polarization configuration of the excitation pulses, which indicates that spin-dependent exciton–exciton interactions contribute to excitation-induced dephasing. In cross-linear polarization, the decay is faster and its dependence on exciton density is stronger as compared to the copolarized configuration. Using a two-exciton model accounting for different spin configurations we are able to reproduce the experimental results.
我们研究了混合卤化铅包晶石晶体 FA0.9Cs0.1PbI2.8Br0.2 中激子的双脉冲光子回波响应与入射激光脉冲的激发强度和偏振的关系。利用光谱窄的皮秒激光脉冲,我们研究了具有长相干时间 T2 ≈ 100 ps 的局部激子。这种方法具有很高的灵敏度,可以在 μeV 尺度上观测激发引起的均质线宽 Γ2 = 2ℏ/T2 的变化。通过与强度相关的测量,我们估算出在激子密度为 1017 cm-3 时,Γ2 增加了 10 μeV,与 14 μeV 的固有线宽相当。我们观察到,光子回波的衰减及其功率依赖性对激发脉冲的偏振构型非常敏感,这表明自旋依赖的激子-激子相互作用对激发诱导的去相现象起了作用。与共极化配置相比,在跨线性极化中,衰减速度更快,其对激子密度的依赖性也更强。通过使用一个考虑到不同自旋构型的双激子模型,我们能够重现实验结果。
{"title":"Spin-Dependent Exciton–Exciton Interactions in a Mixed Lead Halide Perovskite Crystal","authors":"Stefan Grisard, Artur V. Trifonov, Thilo Hahn, Tilmann Kuhn, Oleh Hordiichuk, Maksym V. Kovalenko, Dmitri R. Yakovlev, Manfred Bayer, Ilya A. Akimov","doi":"10.1021/acsphotonics.4c00499","DOIUrl":"https://doi.org/10.1021/acsphotonics.4c00499","url":null,"abstract":"We investigate the two-pulse photon echo response of excitons in the mixed lead halide perovskite crystal FA<sub>0.9</sub>Cs<sub>0.1</sub>PbI<sub>2.8</sub>Br<sub>0.2</sub> in dependence on the excitation intensity and polarization of the incident laser pulses. Using spectrally narrow picosecond laser pulses, we address localized excitons with long coherence times <i>T</i><sub>2</sub> ≈ 100 ps. This approach offers high sensitivity for the observation of excitation-induced changes in the homogeneous line width Γ<sub>2</sub> = 2<i>ℏ</i>/<i>T</i><sub>2</sub> on the μeV scale. Through intensity-dependent measurements, we evaluate the increase of Γ<sub>2</sub> by 10 μeV at an exciton density of 10<sup>17</sup> cm<sup>–3</sup> being comparable with the intrinsic line width of 14 μeV. We observe that the decay of the photon echo and its power dependence are sensitive to the polarization configuration of the excitation pulses, which indicates that spin-dependent exciton–exciton interactions contribute to excitation-induced dephasing. In cross-linear polarization, the decay is faster and its dependence on exciton density is stronger as compared to the copolarized configuration. Using a two-exciton model accounting for different spin configurations we are able to reproduce the experimental results.","PeriodicalId":23,"journal":{"name":"ACS Photonics","volume":null,"pages":null},"PeriodicalIF":7.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141597458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-Speed Broadband PtSe2/Si 2D-3D Pin Photodetector with a Lightly n-Doped Si Interlayer Based on Single-Oriented PtSe2 基于单向 PtSe2 的带有轻 n 掺杂硅夹层的高速宽带 PtSe2/Si 2D-3D 引脚光电探测器
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1021/acsphotonics.4c00450
Tian Ji, Shaoying Ke, Xiaojia Xu, Shaopeng Chen, Zhiming Li, Zhiwei Huang, Guanzhou Liu, Jinrong Zhou, Zhen Wang, Chong Wang
Platinum diselenide (PtSe2), which is a member of transition metal dichalcogenides (TMDs), has aroused significant attention as a promising candidate for high-performance photodetection, owing to its distinctive properties and tunable interlayer band gap. However, the growth of the single-crystal PtSe2 film remains a challenge, while the two-dimensional (2D)/three-dimensional (3D) heterojunction photodetector (PD) based on PtSe2 is generally fabricated by directly combining the film with the substrate. Here, we report an effective method for synthesizing 2 in. single-oriented PtSe2 films in a large diameter cavity by thermally assisted conversion (TAC). Meanwhile, a kind of PD based on the PtSe2/n-Si/n+-Si pin structure is proposed for the first time. For comparison, other PDs based on the PtSe2/Si pn structure are also fabricated. The pin device exhibits a 3 dB frequency of ∼125 kHz, a response speed of 2.2/11.8 μs under the illumination at 532 nm, and a good response under the illumination at 1310, 1550, 1850, and 2200 nm for infrared image sensing. It has been demonstrated that the shorter carrier transit time and better control ability of the electric field can be responsible for the outstanding performance of the pin device. This work provides a potential to develop Si-based integrated optoelectronics with an ultrafast response and a guideline for designing the next-generation pin PD based on 2D materials.
二硒化铂(PtSe2)是过渡金属二硒化物(TMDs)的一种,由于其独特的性质和可调的层间带隙,它作为高性能光电探测的一种有前途的候选材料引起了广泛关注。然而,单晶 PtSe2 薄膜的生长仍然是一项挑战,而基于 PtSe2 的二维(2D)/三维(3D)异质结光电探测器(PD)通常是通过将薄膜与基底直接结合来制造的。在此,我们报告了一种通过热辅助转换(TAC)在大直径空腔中合成 2 英寸单向 PtSe2 薄膜的有效方法。同时,我们首次提出了一种基于 PtSe2/n--Si/n+-Si 针状结构的 PD。为了进行比较,还制作了其他基于 PtSe2/Si pn 结构的 PD。该引脚器件的 3 dB 频率为 125 kHz,在 532 nm 波长的光照下响应速度为 2.2/11.8 μs,在 1310、1550、1850 和 2200 nm 波长的光照下响应良好,可用于红外图像传感。研究表明,载流子传输时间更短和电场控制能力更强是引脚器件性能优异的原因。这项研究为开发具有超快响应的硅基集成光电器件提供了可能性,也为设计基于二维材料的下一代针形光电器件提供了指导。
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引用次数: 0
New Avenues for Phase Imaging: Optical Metasurfaces 相位成像的新途径:光学元表面
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-11 DOI: 10.1021/acsphotonics.4c00359
Niken Priscilla, Shaban B. Sulejman, Ann Roberts, Lukas Wesemann
Visualizing the phase of an optical field is fundamental to applications ranging from biological microscopy through to material science. Its importance is evidenced by the award of the 1953 Nobel Prize to Frits Zernike for his invention of the phase contrast microscope. Conventional phase imaging techniques, including Zernike phase contrast, differential interference contrast, and interferometry, often rely on bulky optical components and macroscopic propagation distances. These factors hinder the miniaturization and integration into ultracompact imaging systems. Furthermore, computational methods also present challenges due to computational complexity, potentially compromising speed and energy efficiency. The recent emergence of the use of nano-optics, including thin films and metasurfaces, in image processing has opened up possibilities for a new class of compact methods for phase imaging. These nanostructured devices have been shown to permit phase visualization, and we believe that they hold the potential to enable the next generation of imaging systems and photodetectors in a broad range of applications.
在从生物显微镜到材料科学的各种应用中,光场相位的可视化都是基础。Frits Zernike 因发明相位对比显微镜而荣获 1953 年诺贝尔奖,足见其重要性。传统的相位成像技术,包括泽尔奈克相位对比、微分干涉对比和干涉测量,通常依赖于笨重的光学元件和宏观传播距离。这些因素阻碍了超小型成像系统的微型化和集成化。此外,计算方法也因计算复杂性而面临挑战,有可能影响速度和能效。最近,纳米光学(包括薄膜和元表面)在图像处理中的应用为相位成像的新型紧凑方法提供了可能性。这些纳米结构器件已被证明可以实现相位可视化,我们相信它们有可能在广泛的应用中实现下一代成像系统和光电探测器。
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引用次数: 0
Emission Wavelength Control Based on Coupling of Surface Plasmon and Microcavity Mode in Organic Light-Emitting Diodes with Metal/Dielectric/Metal Anodes 基于金属/电介质/金属阳极有机发光二极管中表面等离子体和微腔模式耦合的发射波长控制
IF 7 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-07-10 DOI: 10.1021/acsphotonics.3c01314
Yuto Masuda, Takayuki Kiba, Midori Kawamura, Yoshio Abe
Ag/ZnS/Ag (AZA) multilayer films with various ZnS interlayer thicknesses were deposited on glass substrates via thermal vacuum evaporation. The sheet resistances, work functions, transmittances, and reflectances of the AZA structures were characterized to evaluate whether their electrical and optical properties are suitable for application as organic light-emitting diode (OLED) electrodes. The transmittance peak and reflectance dip could be red-shifted by changing the interlayer thickness of the AZA structure, which resulted in a surface plasmon (SP) color filter effect. OLED devices with AZA multilayers of different interlayer thicknesses were then fabricated. Instead of the expected red shift in the emission spectrum due to the surface plasmon color filter effect of the AZA structure, two electroluminescence (EL) peaks were obtained in the AZA OLEDs with 45 and 60 nm thick ZnS interlayers. From the results of the finite-difference time-domain calculations, we conclude that the two split EL peaks are attributed to mode coupling between the optically active surface plasmons of the AZA structure and the microcavity of the OLED structure. The proposed OLED design with a metal/dielectric/metal electrode allows the control of the EL spectral shape and emission color without changing the thickness of the OLED organic layers.
通过热真空蒸发法在玻璃基底上沉积了具有不同 ZnS 层间厚度的 Ag/ZnS/Ag (AZA) 多层薄膜。对 AZA 结构的片电阻、功函数、透射率和反射率进行了表征,以评估其电气和光学特性是否适合用作有机发光二极管(OLED)电极。通过改变 AZA 结构的层间厚度,透射率峰值和反射率倾角可发生红移,从而产生表面等离子体(SP)滤色效应。随后,我们制作了具有不同层间厚度 AZA 多层结构的 OLED 器件。由于 AZA 结构的表面等离子体滤色器效应,发射光谱并没有出现预期的红移,而是在具有 45 和 60 nm 厚 ZnS 夹层的 AZA OLED 中出现了两个电致发光(EL)峰。根据有限差分时域计算的结果,我们得出结论:两个分裂的 EL 峰归因于 AZA 结构的光学活性表面质子与 OLED 结构的微腔之间的模式耦合。所提出的具有金属/电介质/金属电极的 OLED 设计可以在不改变 OLED 有机层厚度的情况下控制 EL 光谱形状和发射颜色。
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引用次数: 0
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ACS Photonics
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