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Flat multifunctional liquid crystal elements through multi-dimensional information multiplexing 平面多功能液晶元件通过多维信息复用
IF 14.1 1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.220063
D. Tang, Zhenglong Shao, Xin Xie, Yingjie Zhou, Xiaohu Zhang, F. Fan, S. Wen
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引用次数: 9
Broadband and continuous wave pumped second-harmonic generation from microfiber coated with layered GaSe crystal 层状GaSe晶体包覆微光纤产生宽带连续波泵浦二次谐波
IF 14.1 1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.230012
Zhen Hao, B. Jiang, Yuxin Ma, Ruixuan Yi, Xuetao Gan, Jianlin Zhao
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引用次数: 1
Paper-based WS2 photodetectors fabricated by all-dry techniques 全干技术制备的纸基WS2光电探测器
IF 14.1 1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.230077
F. Pieri, G. Fiori
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引用次数: 1
Three-dimensional isotropic microfabrication in glass using spatiotemporal focusing of high-repetition-rate femtosecond laser pulses 利用高重复率飞秒激光脉冲的时空聚焦在玻璃中进行三维各向同性微加工
1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.230066
Yuanxin Tan, Haotian Lv, Jian Xu, Aodong Zhang, Yunpeng Song, Jianping Yu, Wei Chen, Yuexin Wan, Zhaoxiang Liu, Zhaohui Liu, Jia Qi, Yangjian Cai, Ya Cheng
To improve the processing efficiency and extend the tuning range of 3D isotropic fabrication, we apply the simultaneous spatiotemporal focusing (SSTF) technique to a high-repetition-rate femtosecond (fs) fiber laser system. In the SSTF scheme, we propose a pulse compensation scheme for the fiber laser with a narrow spectral bandwidth by building an extra-cavity pulse stretcher. We further demonstrate truly 3D isotropic microfabrication in photosensitive glass with a tunable resolution ranging from 8 µm to 22 µm using the SSTF of fs laser pulses. Moreover, we systematically investigate the influences of pulse energy, writing speed, processing depth, and spherical aberration on the fabrication resolution. As a proof-of-concept demonstration, the SSTF scheme was further employed for the fs laser-assisted etching of complicated glass microfluidic structures with 3D uniform sizes. The developed technique can be extended to many applications such as advanced photonics, 3D biomimetic printing, micro-electromechanical systems, and lab-on-a-chips.
为了提高三维各向同性加工的加工效率和扩展调谐范围,我们将同步时空聚焦(SSTF)技术应用于高重复频率飞秒(fs)光纤激光系统。在SSTF方案中,我们提出了一种通过构建腔外脉冲拉伸器对窄频谱带宽光纤激光器进行脉冲补偿的方案。我们进一步展示了真正的3D各向同性微加工在光敏玻璃,可调的分辨率范围从8µm到22µm,使用s激光脉冲的SSTF。此外,我们系统地研究了脉冲能量、写入速度、加工深度和球差对加工分辨率的影响。作为概念验证,SSTF方案进一步用于激光辅助蚀刻三维均匀尺寸的复杂玻璃微流控结构。该技术可扩展到先进光子学、三维仿生打印、微机电系统、芯片实验室等领域。
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引用次数: 0
Broadband all-fiber optical phase modulator based on photo-thermal effect in a gas-filled hollow-core fiber 基于光热效应的宽带全光纤空芯充气光纤相位调制器
IF 14.1 1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.220085
Shoulin Jiang, Feifan Chen, Yan Zhao, Shou-fei Gao, Ying‐ying Wang, H. Ho, W. Jin
We report broadband all-fiber optical phase modulation based on the photo-thermal effect in a gas-filled hollow-core fiber. The phase modulation dynamics are studied by multi-physics simulation. A phase modulator is fabricated using a 5.6-cm-long anti-resonant hollow-core fiber with pure acetylene filling. It has a half-wave optical power of 289 mW at 100 kHz and an average insertion loss 0.6 dB over a broad wavelength range from 1450 to 1650 nm. The rise and fall time constants are 3.5 and 3.7 μs, respectively, 2–3 orders of magnitude better than the previously reported microfiber-based photo-thermal phase modulators. The gas-filled hollow-core waveguide configuration is promising for optical phase modulation from ultraviolet to mid-infrared which is challenging to achieve with solid optical fibers.
本文报道了一种基于光热效应的全光纤相位调制方法。通过多物理场仿真研究了相位调制动力学。采用纯乙炔填充的5.6 cm长抗谐振空心芯光纤制作了相位调制器。它在100 kHz时的半波光功率为289 mW,在1450至1650 nm的宽波长范围内的平均插入损耗为0.6 dB。上升和下降时间常数分别为3.5和3.7 μs,比先前报道的基于微光纤的光热相位调制器提高了2-3个数量级。充气空心波导结构有望实现从紫外到中红外的光相位调制,这是固体光纤难以实现的。
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引用次数: 5
Solvent-free fabrication of broadband WS2 photodetectors on paper 纸上宽带WS2光电探测器的无溶剂制备
IF 14.1 1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.220101
Wenliang Zhang, O. Çakıroğlu, A. Al-Enizi, A. Nafady, Xuetao Gan, Xiaohua Ma, Sruthi Kuriakose, Yong Xie, A. Castellanos-Gomez
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引用次数: 3
Deep-red and near-infrared organic lasers based on centrosymmetric molecules with excited-state intramolecular double proton transfer activity 基于具有激发态分子内双质子转移活性的中心对称分子的深红色和近红外有机激光器
IF 14.1 1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.230007
Chang-Cun Yan, Zong-Lu Che, Wanting Yang, Xue‐Dong Wang, Liang Liao
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引用次数: 2
Ferroelectrically modulate the Fermi level of graphene oxide to enhance SERS response 铁电调制氧化石墨烯的费米能级以增强SERS响应
1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.230094
Mingrui Shao, Chang Ji, Jibing Tan, Baoqiang Du, Xiaofei Zhao, Jing Yu, Baoyuan Man, Kaichen Xu, Chao Zhang, Zhen Li
Surface-enhanced Raman scattering (SERS) substrates based on chemical mechanism (CM) have received widespread attentions for the stable and repeatable signal output due to their excellent chemical stability, uniform molecular adsorption and controllable molecular orientation. However, it remains huge challenges to achieve the optimal SERS signal for diverse molecules with different band structures on the same substrate. Herein, we demonstrate a graphene oxide (GO) energy band regulation strategy through ferroelectric polarization to facilitate the charge transfer process for improving SERS activity. The Fermi level (Ef) of GO can be flexibly manipulated by adjusting the ferroelectric polarization direction or the temperature of the ferroelectric substrate. Experimentally, kelvin probe force microscopy (KPFM) is employed to quantitatively analyze the Ef of GO. Theoretically, the density functional theory calculations are also performed to verify the proposed modulation mechanism. Consequently, the SERS response of probe molecules with different band structures (R6G, CV, MB, PNTP) can be improved through polarization direction or temperature changes without the necessity to redesign the SERS substrate. This work provides a novel insight into the SERS substrate design based on CM and is expected to be applied to other two-dimensional materials.
基于化学机理(CM)的表面增强拉曼散射(SERS)衬底由于其优异的化学稳定性、均匀的分子吸附和可控的分子取向,以稳定和可重复的信号输出而受到广泛关注。然而,如何在同一衬底上对不同带结构的不同分子实现最佳的SERS信号仍然是一个巨大的挑战。在此,我们展示了一种通过铁电极化的氧化石墨烯(GO)能带调节策略,以促进电荷转移过程,从而提高SERS活性。通过调节铁电极化方向或铁电衬底温度,可以灵活地控制氧化石墨烯的费米能级。实验采用开尔文探针力显微镜(KPFM)对氧化石墨烯的Ef进行了定量分析。理论上,密度泛函理论计算也进行了验证所提出的调制机制。因此,不同带结构探针分子(R6G、CV、MB、PNTP)的SERS响应可以通过改变极化方向或温度来改善,而无需重新设计SERS底物。这项工作为基于CM的SERS衬底设计提供了新的见解,并有望应用于其他二维材料。
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引用次数: 1
Third-harmonic generation and imaging with resonant Si membrane metasurface 谐振硅膜超表面的三次谐波产生与成像
1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.220174
Ze Zheng, Lei Xu, Lujun Huang, Daria Smirnova, Khosro Zangeneh Kamali, Arman Yousefi, Fu Deng, Rocio Camacho-Morales, Cuifeng Ying, Andrey E. Miroshnichenko, Dragomir N. Neshev, Mohsen Rahmani
Dielectric metasurfaces play an increasingly important role in enhancing optical nonlinear generations owing to their ability to support strong light-matter interactions based on Mie-type multipolar resonances. Compared to metasurfaces composed of the periodic arrangement of nanoparticles, inverse, so-called, membrane metasurfaces offer unique possibilities for supporting multipolar resonances, while maintaining small unit cell size, large mode volume and high field enhancement for enhancing nonlinear frequency conversion. Here, we theoretically and experimentally investigate the formation of bound states in the continuum (BICs) from silicon dimer-hole membrane metasurfaces. We demonstrate that our BIC-formed resonance features a strong and tailorable electric near-field confinement inside the silicon membrane films. Furthermore, we show that by tuning the gap between the holes, one can open a leaky channel to transform these regular BICs into quasi-BICs, which can be excited directly under normal plane wave incidence. To prove the capabilities of such metasurfaces, we demonstrate the conversion of an infrared image to the visible range, based on the Third-harmonic generation (THG) process with the resonant membrane metasurfaces. Our results suggest a new paradigm for realising efficient nonlinear photonics metadevices and hold promise for extending the applications of nonlinear structuring surfaces to new types of all-optical near-infrared imaging technologies.
介电超表面由于能够支持基于密型多极共振的强光-物质相互作用,在增强光学非线性世代方面发挥着越来越重要的作用。与由纳米颗粒周期性排列组成的超表面相比,逆膜超表面为支持多极共振提供了独特的可能性,同时保持了小晶胞尺寸、大模体积和高场增强,以增强非线性频率转换。本文从理论上和实验上研究了硅二聚体孔膜超表面连续介质中束缚态的形成。我们证明了我们的bic形成的共振在硅膜薄膜内部具有强大和可定制的电场近场约束。此外,我们证明了通过调节孔间的间隙,可以打开一个泄漏通道,将这些规则的BICs转换为准BICs,可以在平面波入射下直接激发。为了证明这种超表面的能力,我们展示了基于共振膜超表面的三次谐波生成(THG)过程的红外图像到可见光范围的转换。我们的研究结果为实现高效非线性光子元器件提供了一个新的范例,并有望将非线性结构表面的应用扩展到新型全光学近红外成像技术。
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引用次数: 5
Photonic integrated neuro-synaptic core for convolutional spiking neural network 卷积脉冲神经网络的光子集成神经突触核
1区 物理与天体物理 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.29026/oea.2023.230140
Shuiying Xiang, Yuechun Shi, Yahui Zhang, Xingxing Guo, Ling Zheng, Yanan Han, Yuna Zhang, Ziwei Song, Dianzhuang Zheng, Tao Zhang, Hailing Wang, Xiaojun Zhu, Xiangfei Chen, Min Qiu, Yichen Shen, Wanhua Zheng, Yue Hao
Neuromorphic photonic computing has emerged as a competitive computing paradigm to overcome the bottlenecks of the von-Neumann architecture. Linear weighting and nonlinear spike activation are two fundamental functions of a photonic spiking neural network (PSNN). However, they are separately implemented with different photonic materials and devices, hindering the large-scale integration of PSNN. Here, we propose, fabricate and experimentally demonstrate a photonic neuro-synaptic chip enabling the simultaneous implementation of linear weighting and nonlinear spike activation based on a distributed feedback (DFB) laser with a saturable absorber (DFB-SA). A prototypical system is experimentally constructed to demonstrate the parallel weighted function and nonlinear spike activation. Furthermore, a four-channel DFB-SA laser array is fabricated for realizing matrix convolution of a spiking convolutional neural network, achieving a recognition accuracy of 87% for the MNIST dataset. The fabricated neuro-synaptic chip offers a fundamental building block to construct the large-scale integrated PSNN chip.
神经形态光子计算已经成为一种有竞争力的计算范式,以克服冯-诺伊曼架构的瓶颈。线性加权和非线性尖峰激活是光子尖峰神经网络的两个基本功能。然而,它们是用不同的光子材料和器件单独实现的,阻碍了PSNN的大规模集成。在这里,我们提出,制造和实验证明了一个光子神经突触芯片,能够同时实现线性加权和非线性尖峰激活基于分布式反馈(DFB)激光器与饱和吸收器(DFB- sa)。实验建立了一个原型系统,验证了并行加权函数和非线性尖峰激活。此外,制作了一个四通道DFB-SA激光阵列,用于实现尖峰卷积神经网络的矩阵卷积,对MNIST数据集的识别精度达到87%。所制备的神经突触芯片为大规模集成PSNN芯片的构建提供了基础模块。
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Opto-Electronic Advances
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