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Recent developments of quantum dot based micro-LED based on non-radiative energy transfer mechanism 基于非辐射能量传递机制的量子点微型led研究进展
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-04-06 DOI: 10.29026/OEA.2021.210022
X. Fan, Tingzhu Wu, Bin Liu, Rong-Xia Zhang, H. Kuo, Zhong Chen
With regard to micro-light-emitting diodes (micro-LEDs), their excellent brightness, low energy consumption, and ultra-high resolution are significant advantages. However, the large size of traditional inorganic phosphors and the number of side defects have restricted the practical applications of small sized micro-LEDs. Recently, quantum dot (QD) and non-radiative energy transfer (NRET) have been proposed to solve existing problems. QDs possess nanoscale dimensions and high luminous efficiency, and they are suitable for NRET because they are able to nearly contact the micro-LED chip. The NRET between QDs and micro-LED chip further improves the color conversion efficiency (CCE) and effective quantum yield (EQY) of full-color micro-LED devices. In this review, we discuss the NRET mechanism for QD micro-LED devices, and then nano-pillar LED, nano-hole LED, and nano-ring LED are introduced in detail. These structures are be-neficial to the NRET between QD and micro-LED, especially nano-ring LED. Finally, the challenges and future envisions have also been described.
对于微型发光二极管(micro- led)而言,其出色的亮度、低能耗和超高分辨率是显著的优势。然而,传统无机荧光粉的大尺寸和大量的侧缺陷限制了小尺寸微型led的实际应用。近年来,人们提出了量子点(QD)和非辐射能量传递(NRET)来解决存在的问题。量子点具有纳米级的尺寸和较高的发光效率,能够与微型led芯片近距离接触,适合用于NRET。量子点与微型led芯片之间的NRET进一步提高了全彩微型led器件的颜色转换效率(CCE)和有效量子产率(EQY)。在本文中,我们讨论了量子点微LED器件的NRET机制,然后详细介绍了纳米柱LED、纳米孔LED和纳米环LED。这些结构有利于量子点与微型LED,特别是纳米环LED之间的NRET。最后,还描述了挑战和未来的设想。
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引用次数: 17
Laser direct writing and characterizations of flexible piezoresistive sensors with microstructures 微结构柔性压阻传感器的激光直写与表征
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-04-06 DOI: 10.29026/OEA.2021.200061
Zhang Chenying, Wei Zhou, Da Geng, Cheng Bai, Weida Li, Songyue Chen, Tao Luo, Lifeng Qin, Xie Yu
Functional materials with high viscosity and solid materials have received more and more attentions in flexible pressure sensors, which are inadequate in the most used molding method. Herein, laser direct writing (LDW) method is proposed to fabricate flexible piezoresistive sensors with microstructures on PDMS/ MWCNTs composites with an 8% MWCNTs mass fraction. By controlling laser energy, microstructures with different geometries can be obtained, which significantly impacts the performances of the sensors. Subsequently, curved microcones with excellent performance are fabricated under parameters of f = 40 kHz and v = 150 mm·s-1. The sensor exhibits continuous multi-linear sensitivity, ultrahigh original sensitivity of 21.80 % kPa-1, wide detection range of over 20 kPa, response/recovery time of ~100 ms and good cycle stability for more than 1000 times. Besides, obvious resistance variation can be observed when tiny pressure (a peanut of 30 Pa) is applied. Finally, the flexible piezoresistive sensor can be applied for LED brightness controlling, pulse detection and voice recognition.
高粘度功能材料和固体材料在柔性压力传感器中受到越来越多的关注,而在最常用的成型方法中,这些材料是不够的。本文提出了激光直写(LDW)方法,在质量分数为8%MWCNTs的PDMS/MWCNTs复合材料上制备具有微结构的柔性压阻传感器。通过控制激光能量,可以获得不同几何形状的微结构,这对传感器的性能有很大影响。随后,在f=40kHz和v=150mm·s-1的参数下制备了具有优异性能的弯曲微通道。该传感器具有连续的多线性灵敏度、21.80%kPa-1的超高原始灵敏度、超过20kPa的宽检测范围、约100ms的响应/恢复时间和超过1000次的良好循环稳定性。此外,当施加微小的压力(30Pa的花生)时,可以观察到明显的阻力变化。最后,柔性压阻传感器可用于LED亮度控制、脉冲检测和语音识别。
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引用次数: 18
Directional sliding of water: biomimetic snake scale surfaces 水的定向滑动:仿生蛇鳞表面
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-04-06 DOI: 10.29026/OEA.2021.210008
Yizhe Zhao, Yilin Su, X. Hou, Minghui Hong
Bioinspired superhydrophobic surfaces have attracted many industrial and academic interests in recent years. Inspired by unique superhydrophobicity and anisotropic friction properties of snake scale surfaces, this study explores the feasibility to produce a bionic superhydrophobic stainless steel surface via laser precision engineering, which allows the realization of directional superhydrophobicity and dynamic control of its water transportation. Dynamic mechanism of water slid-ing on hierarchical snake scale structures is studied, which is the key to reproduce artificially bioinspired multifunctional materials with great potentials to be used for water harvesting, droplet manipulation, pipeline transportation, and vehicle acceleration.
近年来,仿生超疏水表面引起了工业界和学术界的广泛关注。受蛇鳞表面独特的超疏水性和各向异性摩擦特性的启发,本研究探索了通过激光精密工程制造仿生超疏水不锈钢表面的可行性,该表面可以实现定向超疏水性和对其输水的动态控制。研究水在蛇鳞层结构上的滑动动力学机制,是制备生物仿生多功能材料的关键,该材料在集水、液滴操纵、管道运输和车辆加速等方面具有很大的应用潜力。
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引用次数: 46
Light-emitting MXene quantum dots 发光MXene量子点
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-03-25 DOI: 10.29026/OEA.2021.200077
A. S. Sharbirin, Sophia Akhtar, Jeongyong Kim
MXene (Mn+1Xn) is an emerging class of layered two-dimensional (2D) materials, which are derived from their bulk-state MAX phase (Mn+1AXn, where M: early transition metal, A: group element 13 and 14, and X: carbon and/or nitrogen). MXenes have found wide-ranging applications in energy storage devices, sensors, catalysis, etc. owing to their high electronic conductivity and wide range of optical absorption. However, the absence of semiconducting MXenes has limited their applications related to light emission. Research has shown that quantum dots (QDs) derived from MXene (MQDs) not only retain the properties of the parent MXene but also demonstrate significant improvement on light emission and quantum yield (QY). The optical properties and photoluminescence (PL) emission mechanisms of these light-emitting MQDs have not been comprehensively investigated. Recently, work on light-emitting MQDs has shown good progress, and MQDs exhibiting multi-color PL emission along with high QY have been fabricated. The synthesis methods also play a vital role in determining the light emission properties of these MQDs. This review provides an overview of light-emitting MQDs and their synthesis methods, optical properties, and applications in various optical, sensory, and imaging devices. The future prospects of light-emitting MQDs are also discussed to provide an insight that helps to further advance the progress on MQDs.
MXene (Mn+1Xn)是一类新兴的层状二维(2D)材料,源于其体态MAX相(Mn+1AXn,其中M:早期过渡金属,A:族元素13和14,X:碳和/或氮)。由于其高电子导电性和广泛的光学吸收,MXenes在能量存储设备,传感器,催化等方面得到了广泛的应用。然而,半导体MXenes的缺乏限制了它们在发光方面的应用。研究表明,MXene衍生的量子点(QDs)不仅保留了母体MXene的特性,而且在光发射和量子产率(QY)方面也有显著改善。这些发光mqd的光学性质和光致发光机制尚未得到全面的研究。近年来,发光mqd的研究取得了良好的进展,已经制备出具有多色发光和高量子密度的mqd。合成方法对这些mqd的发光性能也起着至关重要的作用。本文综述了发光mqd及其合成方法、光学性质及其在各种光学、传感和成像器件中的应用。本文还讨论了发光mqd的未来前景,以提供有助于进一步推进mqd进展的见解。
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引用次数: 34
Flexible rotation of transverse optical field for 2D self-accelerating beams with a designated trajectory 具有指定轨迹的二维自加速光束横向光场的柔性旋转
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-03-25 DOI: 10.29026/OEA.2021.200021
Zongtao Li, Cao Kai, Jiasheng Li, Yong Tang, Xinrui Ding, Binhai Yu
Self-accelerating beams have the unusual ability to remain diffraction-free while undergo the transverse shift during the free-space propagation. We theoretically identify that the transverse optical field distribution of 2D self-accelerating beam is determined by the selection of the transverse Cartesian coordinates, when the caustic method is utilized for its trajectory design. Based on the coordinate-rotation method, we experimentally demonstrate a scheme to flexibly manipulate the rotation of transverse optical field for 2D self-accelerating beams under the condition of a designated trajectory. With this scheme, the transverse optical field can be rotated within a range of 90 degrees, especially when the trajectory of 2D self-accelerating beams needs to be maintained for free-space photonic interconnection.
自加速光束在自由空间传播过程中具有不受衍射影响的特性。从理论上证明了采用焦散法进行轨迹设计时,二维自加速光束的横向光场分布取决于横向笛卡尔坐标的选择。基于坐标旋转方法,实验证明了一种在指定轨迹条件下灵活控制二维自加速光束横向光场旋转的方案。利用该方案,横向光场可以在90度范围内旋转,特别是当需要保持二维自加速光束的轨迹以实现自由空间光子互连时。
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引用次数: 1
Review of micromachined optical accelerometers: from mg to sub-μg 微机械光学加速度计综述:从mg到亚μg
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-03-25 DOI: 10.29026/OEA.2021.200045
Qianbo Lu, Yinan Wang, Xiaoxu Wang, Yuan Yao, Xuewen Wang, Wei Huang
Micro-Opto-Electro-Mechanical Systems (MOEMS) accelerometer is a new type of accelerometer which combines the merits of optical measurement and Micro-Electro-Mechanical Systems (MEMS) to enable high precision, small volume and anti-electromagnetic disturbance measurement of acceleration. In recent years, with the in-depth research and development of MOEMS accelerometers, the community is flourishing with the possible applications in seismic monitoring, inertial navigation, aerospace and other industrial and military fields. There have been a variety of schemes of MOEMS accelerometers, whereas the performances differ greatly due to different measurement principles and corresponding application requirements. This paper aims to address the pressing issue of the current lack of systematic review of MOEMS accelerometers. According to the optical measurement principle, we divide the MOEMS accelerometers into three categories: the geometric optics based, the wave optics based, and the new optomechanical accelerometers. Regarding the most widely studied category, the wave optics based accelerometers are further divided into four sub-categories, which is based on grating interferometric cavity, Fiber Bragg Grating (FBG), Fabry-Perot cavity, and photonic crystal, respectively. Following a brief introduction to the measurement principles, the typical performances, advantages and disadvantages as well as the potential application scenarios of all kinds of MOEMS accelerometers are discussed on the basis of typical demonstrations. This paper also presents the status and development tendency of MOEMS accelerometers to meet the ever-increasing demand for high-precision acceleration measurement.
微光电系统(MOEMS)加速度计是一种结合了光学测量和微机电系统(MEMS)优点的新型加速度计,能够实现高精度、小体积和抗电磁干扰的加速度测量。近年来,随着MOEMS加速度计的深入研究和发展,在地震监测、惯性导航、航空航天等工业和军事领域的应用前景一片广阔。MOEMS加速度计的设计方案多种多样,但由于测量原理和应用要求的不同,其性能差异很大。本文旨在解决当前MOEMS加速度计缺乏系统综述的紧迫问题。根据光学测量原理,将MOEMS加速度计分为几何光学加速度计、波光学加速度计和新型光机械加速度计三类。作为研究最广泛的一类,基于波光学的加速度计又进一步分为基于光栅干涉腔、光纤布拉格光栅(FBG)、法布里-珀罗腔和光子晶体的四类。简要介绍了MOEMS加速度计的测量原理,在典型演示的基础上,讨论了各种MOEMS加速度计的典型性能、优缺点以及潜在的应用场景。本文还介绍了MOEMS加速度计的现状和发展趋势,以满足日益增长的高精度加速度测量需求。
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引用次数: 30
Circular cladding waveguides in Pr:YAG fabricated by femtosecond laser inscription: Raman, luminescence properties and guiding performance 飞秒激光制备Pr:YAG圆形包层波导:拉曼、发光特性和引导性能
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-02-28 DOI: 10.29026/OEA.2021.200005
Quanxin Yang, Hongliang Liu, Shan He, B. Tian, Pengfei Wu
We report on the fabrication of circular cladding waveguides with cross-section diameters of 60−120 μm in Pr:YAG crystal by applying femtosecond laser inscription. The fabricated waveguides present 2D guidance on the cross-section and fairly low propagation losses. Multiple high-order guiding modes are observed in waveguides with different diameters. Corresponding simulation results reveal the origin of a specific kind of guiding modes. Confocal micro-Raman (μ-Raman) experiments demonstrate the modification effects in femtosecond laser affected areas and ascertain the refractive index induced guiding mechanism. In addition, luminescence emission properties of Pr3+ ions at waveguide volume are well preserved during the femtosecond laser inscription process, which may result in a potential high-power visible waveguide laser.
我们报道了用飞秒激光在Pr:YAG晶体中制备截面直径为60−120μm的圆形包层波导。所制造的波导在横截面上呈现2D引导并且具有相当低的传播损耗。在不同直径的波导中观察到多个高阶导模。相应的仿真结果揭示了一种特定制导方式的起源。共聚焦微拉曼(μ-Raman)实验证明了飞秒激光影响区的改性效应,并确定了折射率诱导的引导机制。此外,在飞秒激光刻蚀过程中,Pr3+离子在波导体积下的发光特性得到了很好的保留,这可能导致潜在的高功率可见光波导激光器。
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引用次数: 21
Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses 用氧化石墨烯金属透镜产生超分辨光学针和多焦点阵列
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-02-28 DOI: 10.29026/OEA.2021.200031
Hongtao Wang, Chenglong Hao, Han Lin, Yongtian Wang, Tian Lan, C. Qiu, B. Jia
Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses, offering new possibilities for myriads of miniaturization and interfacial applications. Graphene-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like materials. In this work, we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material system. We experimentally validate our strategies via demonstrations of two graphene oxide metalenses: one with an ultra-long (~16λ) optical needle, and the other with axial multifocal spots, at the wavelength of 632.8 nm with a 200 nm thin film. Our proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.
超薄平面金属透镜已成为传统衍射透镜的有前途的替代品,为无数小型化和界面应用提供了新的可能性。基于石墨烯的材料可以在单个位置同时实现相位和振幅调制,这是由于通过从氧化石墨烯到类石墨烯材料的激光转换来改变复折射率和厚度。在这项工作中,我们开发了氧化石墨烯金属透镜,以精确控制相位和振幅调制,并实现基于石墨烯材料系统的整体和系统的透镜设计。我们通过演示两个氧化石墨烯金属套来实验验证我们的策略:一个具有超长(~16λ)光学针,另一个具有轴向多焦点,波长632.8 nm,具有200 nm薄膜。我们提出的氧化石墨烯金属套为准确设计用于广泛应用的石墨烯基超薄可集成器件提供了前所未有的机会。
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引用次数: 29
Review of blue perovskite light emitting diodes with optimization strategies for perovskite film and device structure 蓝色钙钛矿发光二极管及其薄膜和器件结构优化策略综述
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-02-28 DOI: 10.29026/OEA.2021.200019
Zongtao Li, Cao Kai, Jiasheng Li, T. Yong, Xinrui Ding, Binhai Yu
Perovskite light emitting diodes (PeLEDs) have attracted considerable research attention because of their external quantum efficiency (EQE) of >20% and have potential scope for further improvement. However, compared to red and green PeLEDs, blue PeLEDs have not been extensively investigated, which limits their commercial applications in the fields of luminance and full-color displays. In this review, blue-PeLED-related research is categorized by the composition of perovskite. The main challenges and corresponding optimization strategies for perovskite films are summarized. Next, the novel strategies for the design of device structures of blue PeLEDs are reviewed from the perspective of transport layers and interfacial layers. Accordingly, future directions for blue PeLEDs are discussed. This review can be a guideline for optimizing perovskite film and device structure of blue PeLEDs, thereby enhancing their development and application scope.
钙钛矿发光二极管(PeLED)由于其>20%的外量子效率(EQE)而引起了相当大的研究关注,并且具有进一步改进的潜力。然而,与红色和绿色PELED相比,蓝色PELED尚未得到广泛研究,这限制了其在亮度和全色显示器领域的商业应用。在这篇综述中,蓝色PeLED的相关研究按钙钛矿的组成进行了分类。概述了钙钛矿薄膜的主要挑战和相应的优化策略。接下来,从传输层和界面层的角度综述了蓝色PELED器件结构设计的新策略。因此,对蓝色PeLED的未来发展方向进行了讨论。这篇综述可以为优化蓝色PELED的钙钛矿膜和器件结构,从而扩大其开发和应用范围提供指导。
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引用次数: 21
Plasma and nanoparticle shielding during pulsed laser ablation in liquids cause ablation efficiency decrease 等离子体和纳米粒子的屏蔽会导致脉冲激光在液体中的烧蚀效率降低
IF 14.1 1区 物理与天体物理 Q1 OPTICS Pub Date : 2021-01-27 DOI: 10.29026/OEA.2021.200072
S. Dittrich, S. Barcikowski, Bilal Gökce
Understanding shielding cross-effects is a prerequisite for maximal power-specific nanosecond laser ablation in liquids (LAL). However, discrimination between cavitation bubble (CB), nanoparticle (NP), and shielding, e.g., by the plasma or a transient vapor layer, is challenging. Therefore, CB imaging by shadowgraphy is performed to better understand the plasma and laser beam-NP interaction during LAL. By comparing the fluence-dependent CB volume for ablations performed with 1 ns pulses with reports from the literature, we find larger energy-specific CB volumes for 7 ns-ablation. The increased CB for laser ablation with higher ns pulse durations could be a first explanation of the efficiency decrease reported for these laser systems having higher pulse durations. Consequently, 1 ns-LAL shows superior ablation efficiency. Moreover, a CB cascade occurs when the focal plane is shifted into the liquid. This effect is enhanced when NPs are present in the fluid. Even minute amounts of NPs trapped in a stationary layer decrease the laser energy significantly, even under liquid flow. However, this local concentration in the sticking film has so far not been considered. It presents an essential obstacle in high-yield LAL, shielding already the second laser pulse that arrives and presenting a source of satellite bubbles. Hence, measures to lower the NP concentration on the target must be investigated in the future.
了解屏蔽交叉效应是实现液体中最大功率比纳秒激光烧蚀(LAL)的前提。然而,区分空化泡(CB)、纳米粒子(NP)和屏蔽(如等离子体或瞬态蒸汽层)是具有挑战性的。因此,通过阴影成像进行CB成像,以更好地了解等离子体和激光束在LAL期间的np相互作用。通过比较1ns脉冲消融与文献报道的影响相关的CB体积,我们发现7ns脉冲消融的能量比CB体积更大。高ns脉冲持续时间的激光烧蚀增加的CB可能是高ns脉冲持续时间的激光系统效率下降的第一个解释。因此,1ns - lal具有较好的烧蚀效率。此外,当焦平面移位到液体中时,会发生CB级联。当流体中存在NPs时,这种效果会增强。即使是极少量的NPs被困在固定层中,即使在液体流动下,也会显著降低激光能量。然而,到目前为止,还没有考虑到贴膜中的局部浓度。它是高产量LAL的一个重要障碍,它已经屏蔽了到达的第二个激光脉冲,并形成了卫星气泡的来源。因此,未来必须研究降低目标上NP浓度的措施。
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引用次数: 23
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Opto-Electronic Advances
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