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Research on composite manufacturing method of semi-buried 1×32 optical splitter 半埋式1×32光分路器复合制造方法研究
IF 0.6 4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230202
Qing Tao, Sihao Xie
In this paper, a composite manufacturing method was proposed to reduce the inner surface roughness of silica groove. Firstly, femtosecond laser was used to ablate the silica groove, then, a 5% concentration hydrofluoric acid solution was used to corrode the inner surface of silica groove. Secondly, Su8 adhesive was filled with the groove to form a semi-buried 1×32 optical splitter by doctor blade. The test results showed that the surface roughness Ra was less than 0.2 µm, and average insertion loss of output ports was 21.34 dB, moreover, the uniformity was less than 1.44 dB. Compared with the traditional femtosecond laser ablating method, surface roughness reduced by at least 0.1 µm, and the average insertion loss of output ports was reduced by 1.22 dB, and the uniformity was reduced by 0.41 dB. So, the composite manufacturing method improved the communication performance. It is satisfied with the requirements for optical interconnection in the electro-optical printed circuit boards.
本文提出了一种降低硅沟槽内表面粗糙度的复合制造方法。首先用飞秒激光烧蚀二氧化硅沟槽,然后用5%浓度的氢氟酸溶液腐蚀二氧化硅沟槽内表面。其次,将Su8胶粘剂填充到凹槽内,用博士刀形成半埋式1×32光分路器。测试结果表明,表面粗糙度Ra小于0.2µm,输出端口平均插入损耗为21.34 dB,均匀性小于1.44 dB。与传统飞秒激光烧蚀方法相比,表面粗糙度降低了至少0.1µm,输出端口的平均插入损耗降低了1.22 dB,均匀性降低了0.41 dB。因此,复合制造方法提高了通信性能。满足了光电印刷电路板对光互连的要求。
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引用次数: 0
Evaluation of a high-speed hybrid OAM-OFDM-MDM multiplexed coherent FSO system under desert conditions 沙漠条件下高速混合OAM-OFDM-MDM复用相干FSO系统的评估
4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230308
Shivaji Sinha, Chakresh Kumar
To meet the needs of future wireless optical networks, this paper introduces a high-speed, hybrid multiplexed, coherent free-space optical (FSO) communication system that integrates an orbital angular momentum (OAM) multiplexed signal with an orthogonal frequency division multiplexing (OFDM) technique. Two independent QAM polarized beams, each carrying in-phase and quadrature (I/Q) phase 16-QAM-OFDM modulated data, are combined using mode division multiplexing (MDM) to increase the capacity of the proposed system. The reason of choosing OFDM is its capability to support higher data rate, and mitigating intersymbol interference (ISI). The signal is detected using a coherent detection-based digital signal processing (DSP) algorithm at the receiver end. The proposed hybrid FSO system is evaluated in low and heavy dust environments using bit error rate (BER), link distance, optical signal-to-noise ratio (OSNR), and received optical power performance matrices. The simulation results demonstrate the successful transmission of a 120 Gb/s single carrier over the longest link ranges of 1.5 and 0.40 km, respectively, under low and heavy dust weather environments below the signal degradation threshold value (forward error correction (FEC) limit) of BER 2.2 × 10 –3 in strong turbulent conditions.
为了满足未来无线光网络的需求,本文介绍了一种将轨道角动量(OAM)复用信号与正交频分复用(OFDM)技术相结合的高速混合复用相干自由空间光通信系统。两个独立的QAM极化波束,各自携带同相和正交(I/Q)相位16-QAM-OFDM调制数据,使用模分复用(MDM)进行组合以增加所提出系统的容量。选择OFDM的原因是它能够支持更高的数据速率,并且能够减轻码间干扰(ISI)。在接收端使用基于相干检测的数字信号处理(DSP)算法检测信号。采用误码率(BER)、链路距离、光信噪比(OSNR)和接收光功率性能矩阵对混合FSO系统在低粉尘和重粉尘环境下的性能进行了评估。仿真结果表明,在强湍流条件下,在低尘和重尘天气环境下,在低于信号退化阈值(前向纠错(FEC)限制)BER 2.2 × 10 -3的情况下,120 Gb/s单载波在1.5 km和0.40 km的最长链路距离上成功传输。
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引用次数: 0
Ammonia level sensor using tapered optical fiber coated with titanium dioxide-incorporated porphyrin 氨液位传感器采用锥形光纤涂层与二氧化钛结合卟啉
4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230302
Frazna Parasuti, Dyah Hikmawati, Herri Trilaksana, Moh. Yasin
Since ammonia is water-soluble, environmental studies have shown that the industrial waste such as fertilizer manufacturing, food products, palm oil, urea fertilizer industry can cause very serious damage to water body ecosystems if not properly managed, resulting in a decrease in water quality. Devices based on optical technology, especially devices that combine optical fibers and nanomaterials, are identified as highly sensitive to the species of interest by detecting changes in physicochemical properties. A practical, easy-to-use, inexpensive instrument for detecting ammonia level was proposed using tapered optical fiber (TOF) coated with titanium dioxide-incorporated porphyrin. TOF was fabricated by simultaneously stretching and heating. The preparation of TiO 2 /porphyrin/gelatine was prepared to coat tapered optical fiber by dipping. SEM analysis shows an increase in length and a decrease in diameter, also the successful coating of titanium dioxide and porphyrin in the taper region. The EDX analysis also proves the presence of the Ti element in the TOF layer. The TOF produces significant sensing performances toward the ammonia liquid concentration level. The TOF coated with titanium dioxide-incorporated porphyrin can detect a one ppm difference in ammonia concentration with a certain range of output voltage for every concentration has.
由于氨是水溶性的,环境研究表明,肥料制造、食品、棕榈油、尿素肥料等工业废弃物如果管理不当,会对水体生态系统造成非常严重的破坏,导致水质下降。基于光学技术的器件,特别是结合光纤和纳米材料的器件,通过检测物理化学性质的变化,被认为对感兴趣的物种高度敏感。提出了一种实用、易用、价格低廉的氨浓度检测仪器,该仪器采用包覆二氧化钛掺杂卟啉的锥形光纤(TOF)。采用同时拉伸和加热的方法制备TOF。采用浸渍法制备了覆盖锥形光纤的tio2 /卟啉/明胶。扫描电镜分析表明,涂层的长度增加,直径减小,并且在锥度区成功地涂覆了二氧化钛和卟啉。EDX分析也证实了钛元素在TOF层中的存在。TOF对氨液浓度水平具有显著的传感性能。涂有二氧化钛结合卟啉的TOF可以在一定的输出电压范围内检测出每种浓度的氨浓度相差1 ppm。
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引用次数: 0
Optical simulations and optimization of highly sensitive biosensor for cancer cell detection 用于癌细胞检测的高灵敏度生物传感器的光学模拟与优化
4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230306
Abdelkarim El Mouncharih, Rabi Takassa, Omar Farkad, Abdelaziz Tchenka, El Alami Ibnouelghazi, Driss Abouelaoualim
In this work, using the two-dimensional finite difference time domain method, we are theoretically studying the optical properties of a two-dimensional photonic crystal biosensor based on silicon rods arranged as a square structure in an air bottom with two waveguides and a nanocavity. For this purpose, six different cells are infiltrated into the point defect. These six cells are Jurkat, HeLa, PC-12, MDA-MB-231, MCF-7, and basal cells. As a result, we have successfully detected cancer and benign cases of these cells through resonance peaks in the transmission spectrum. We evaluated the sensitivity, quality factor, detection limit, and figure of merit at different values for sensing region radius for optimization purposes. We report that we observed the maximum sensitivity of 1350 nm/RIU at 0.15 μm for the basal cell. Finally, the proposed biosensor can be a miniaturized structure with extreme sensitivity in cancer cell detection models.
在这项工作中,我们利用二维时域有限差分方法,从理论上研究了一种基于硅棒的二维光子晶体生物传感器的光学特性,硅棒排列成正方形结构,在具有两个波导和一个纳米腔的空气底部。为此,将六个不同的细胞浸润到点缺陷中。这六种细胞分别是Jurkat、HeLa、PC-12、MDA-MB-231、MCF-7和基底细胞。因此,我们成功地通过透射光谱中的共振峰检测出这些细胞的癌症和良性病例。我们评估了灵敏度、质量因子、检测限和在不同值的感应区域半径的优值,以优化目的。我们在0.15 μm处观察到基底细胞的最大灵敏度为1350 nm/RIU。最后,所提出的生物传感器可以成为癌细胞检测模型中具有极高灵敏度的小型化结构。
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引用次数: 0
Designing ultra-fast all-optical full-subtractor using the photonic crystal structure 利用光子晶体结构设计超高速全光全减光器
IF 0.6 4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230107
In this paper, a photonic crystal-based structure for an all-optical full-subtractor has been proposed. The structure includes six nonlinear resonant rings to transmit the incoming optical waves toward the output ports. Using the different radii for nonlinear rods made the possibility of the dropping operation for different amounts of optical intensities. The nonlinear rods are made of a doped-glass with an optical Kerr coefficient of 10–15 m2/W. To calculate the components of the optical waves throughout the structure, the finite-difference time-domain method has been used. The simulation results prove the correct functionality of the proposed structure. Besides, the maximum rise time of the device is equal to 2 ps. The contrast ratio and the area of the structure are around 8.08 dB and 2790 µm2, respectively.
本文提出了一种基于光子晶体的全光全减光器结构。该结构包括六个非线性谐振环,用于将入射光波传输到输出端口。对非线性杆采用不同的半径,使得在不同的光强量下进行滴注操作成为可能。非线性棒由掺杂玻璃制成,光学克尔系数为10-15 m2/W。为了计算整个结构的光波分量,采用时域有限差分法。仿真结果证明了该结构的功能是正确的。该器件的最大上升时间为2ps,对比度约为8.08 dB,结构面积约为2790µm2。
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引用次数: 1
Research on characteristics of embedded resonator sensor based on PtS2 基于PtS2的嵌入式谐振器传感器特性研究
IF 0.6 4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230204
Xin Li, Xieyuan Li, Haitao Zhang, Shuang Chen, Shurong Liu, Yang Li
An embedded microring resonator model using PtS2 as the core layer was designed and optimized for sensing. The inner layer is made of PtS2, and SiO2 and Si3N4 are used as cladding. The overall structure is Si3N4-SiO2-PtS2-SiO2-Si3N4. Field strength distribution of longitudinal section of single straight waveguide and the longitudinal section of coupling part of straight and annular waveguides are simulated according to the coupled-mode theory. The transfer matrix method is used to analyze characteristics between the length of the U-shaped feedback waveguide and the circumference of microring and the change of attenuation factor and coupling coefficient on the output spectrum. The simulation results showed that the embedded microring resonator with PtS2 as the core presents excellent optical properties. The resonance depth is more than –50 dB, and the sensitivity can reach 1806.61 dB/RIU. When the resonance wavelength is 1550.86 nm and the self-coupling coefficient is 0.9849. The corresponding detection limit is about 1.66056 × 10–7 dB/RIU, and the quality factor is 2.8848 × 10–5 under the measurement system with a signal-to-noise ratio of 30 dB. Compared with the traditional single microring structure, the proposed microring presents a higher free spectral range and more suitable for the fabrication of high-sensitivity, low-detection limit, and large-measurement range sensors.
设计并优化了以PtS2为核心层的嵌入式微环谐振器模型。内层材料为PtS2,包层材料为SiO2和Si3N4。整体结构为Si3N4-SiO2-PtS2-SiO2-Si3N4。根据耦合模理论,对单根直波导纵剖面和直波导与环形波导耦合部分纵剖面的场强分布进行了仿真。利用传递矩阵法分析了u型反馈波导长度与微环周长之间的特性以及输出频谱上衰减系数和耦合系数的变化。仿真结果表明,以PtS2为核心的嵌入式微环谐振器具有优异的光学性能。谐振深度大于-50 dB,灵敏度可达1806.61 dB/RIU。当谐振波长为1550.86 nm时,自耦合系数为0.9849。在信噪比为30 dB的测量系统下,相应的检测限约为1.66056 × 10-7 dB/RIU,质量因子为2.8848 × 10-5。与传统的单微环结构相比,该微环具有更高的自由光谱范围,更适合制作高灵敏度、低检测限、大测量范围的传感器。
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引用次数: 0
Phase retrieval without phase unwrapping for white blood cells in deep-learning phase-shifting digital holography 深度学习移相数字全息中白细胞的相位恢复
IF 0.6 4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230109
Shuyang Jin, Xiaoqing Xu, Jili Chen, Yudan Ni
Phase retrieval and phase unwrapping are the two important problems for enabling quantitative phase imaging of cells in phase-shifting digital holography. To simultaneously cope with these two problems, a deep-learning phase-shifting digital holography method is proposed in this paper. The proposed method can establish the continuous mapping function of the interferogram to the ground-truth phase using the end-to-end convolutional neural network. With a well-trained deep convolutional neural network, this method can retrieve the phase from one-frame blindly phase-shifted interferogram, without phase unwrapping. The feasibility and applicability of the proposed method are verified by the simulation experiments of the microsphere and white blood cells, respectively. This method will pave the way to the quantitative phase imaging of biological cells with complex substructures.
相位恢复和相位展开是实现相移数字全息中细胞定量相位成像的两个重要问题。为了同时解决这两个问题,本文提出了一种深度学习移相数字全息方法。该方法利用端到端卷积神经网络建立干涉图到地真相位的连续映射函数。该方法利用训练良好的深度卷积神经网络,可以从一帧盲相移干涉图中提取相位,而不需要进行相位解包裹。通过微球和白细胞的模拟实验,验证了所提方法的可行性和适用性。该方法将为具有复杂亚结构的生物细胞的定量相位成像铺平道路。
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引用次数: 0
An extrinsic Fabry–Pérot interference fiber sensorfor ultrasonic detection of partial discharge 一种用于局部放电超声检测的外源性法布里-普氏干涉光纤传感器
IF 0.6 4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230203
Ximin Zhang, Sen Qian, Huixin Liu, Chuan Chen, Chuanlu Deng, Chengyong Hu, Yi Huang
An ultrasonic sensor based on extrinsic Fabry–Pérot interference (EFPI) has been designed and demonstrated to detect the ultrasonic wave signal. The sensitivity and natural frequency of fiber Fabry–Pérot (F-P) sensor with different structure parameter have been simulated by COMSOL. The simulation results illustrate that the sensitivity is up to 1.737 nm/kPa and the natural frequency is 2.1 MHz, when the silica diaphragm thickness is 2 μm, the radius is 90 μm, and the cavity length is 18 μm. The most suitable parameters have been selected and the F-P sensor has been fabricated. When the ultrasonic signals with the frequencies of 40 kHz and 1.2 MHz are respectively applied to the sensor, the frequencies detected by the EFPI ultrasonic sensor are 39 kHz and 1.21 MHz based on a partial discharge detection experiment for the designed demodulation system. The experimental results show that the sensor can accurately detect ultrasonic signals. As an excellent platform for ultrasonic signal sensing, this EFPI ultrasonic sensing system has great potential applications in partial discharge detection field.
设计并演示了一种基于外部法布里-帕氏干涉(EFPI)的超声波传感器,用于检测超声波信号。利用COMSOL软件对不同结构参数的F-P光纤传感器的灵敏度和固有频率进行了仿真。仿真结果表明,当硅膜厚度为2 μm,半径为90 μm,腔长为18 μm时,灵敏度可达1.737 nm/kPa,固有频率为2.1 MHz。选择了最合适的参数,制作了F-P传感器。当频率为40 kHz和1.2 MHz的超声波信号分别施加到传感器上时,通过对所设计的解调系统进行局部放电检测实验,EFPI超声波传感器检测到的频率分别为39 kHz和1.21 MHz。实验结果表明,该传感器能够准确地检测出超声波信号。该EFPI超声传感系统作为一种优秀的超声信号传感平台,在局部放电检测领域具有很大的应用潜力。
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引用次数: 0
Transverse energy propagation and interference of elliptical Gaussian beams 椭圆高斯光束的横向能量传播与干涉
IF 0.6 4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230207
Jin Li, Shuang-Cheng Tan
Elliptical Gaussian beam (EGB) has many different physical properties from circular Gaussian beam. In this paper, the transverse energy flux and intensity of one and two coherent EGBs are studied. In our simulation, the transverse energy flux and intensity varying with waist ratio are discussed in detail. It has been found that through increasing the waist ratio, the transverse energy flux after interference would be strengthened significantly. Although the transverse energy flux is much weaker than the longitudinal energy flux, its signal to noise ratio has been verified to be strong enough for detection. Our derivations are still reasonable for another simulation with general experimental parameters. The simulation results are considered to be helpful for some physical experiments using the transverse energy flux of Gaussian beam, such as an important application in electromagnetic response produced by interaction of high-frequency gravitational waves.
椭圆高斯光束(EGB)与圆形高斯光束具有许多不同的物理性质。本文研究了一个和两个相干EGBs的横向能量通量和强度。在我们的模拟中,详细讨论了横向能量通量和强度随腰比的变化。研究发现,通过增大腰比,干涉后的横向能量通量显著增强。虽然横向能量通量比纵向能量通量弱得多,但其信噪比已被证实足以检测。我们的推导对于具有一般实验参数的另一种模拟仍然是合理的。仿真结果对利用高斯光束的横向能量通量进行物理实验,如研究高频引力波相互作用产生的电磁响应具有重要意义。
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引用次数: 0
Effects of plasma expansion plumes in view of pulses laser irradiating centimeter-scale spherical space debris 脉冲激光照射厘米级球形空间碎片对等离子体膨胀羽流的影响
4区 物理与天体物理 Q4 Materials Science Pub Date : 2023-01-01 DOI: 10.37190/oa230303
None Yingwu Fang
The objective of this article was to investigate the dynamic evolution behaviors of plasma expansion plumes by pulses laser irradiating centimeter-scale spherical space debris. A calculated model of centimeter-scale spherical space debris irradiated by pulses laser was firstly deduced based on FEM (finite element method)/COMSOL, and the action rules of plasma expansion plumes by pulses laser-generated irradiating the debris were simulated for different laser powers and action times. The results showed that the velocity of plasma expansion plumes was increased with the increase of laser powers and action times. Especially, when the laser power was 700 kW and the action time was close to 25 μs, the maximum velocity of plasma expansion plumes approached 1.91 km/s, and the diffusion radius of plasma expansion plumes was increased by about 2.5 mm. Further, the diffusion radius was about twice that of 400 kW when the action time reached about 48 μs. As a result, by simulating the transient flow process of nanosecond pulses laser irradiating small spherical space debris, the flow field evolution information and plasma plumes evolution characteristics of centimeter-scale space debris at nanosecond time resolution were revealed.
本文研究了脉冲激光辐照厘米尺度球形空间碎片后等离子体膨胀羽流的动态演化行为。基于有限元/COMSOL软件,建立了厘米尺度球形空间碎片脉冲激光辐照计算模型,模拟了脉冲激光辐照碎片产生的等离子体膨胀羽流在不同激光功率和作用时间下的作用规律。结果表明,等离子体膨胀羽流的速度随激光功率和作用次数的增加而增加。特别是当激光功率为700 kW,作用时间接近25 μs时,等离子体膨胀羽流的最大速度接近1.91 km/s,等离子体膨胀羽流的扩散半径增加了约2.5 mm。当作用时间约为48 μs时,扩散半径约为400 kW时的2倍。通过模拟纳秒脉冲激光辐照小球形空间碎片的瞬态流动过程,揭示了厘米尺度空间碎片在纳秒时间分辨率下的流场演化信息和等离子体羽流演化特征。
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引用次数: 0
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Optica Applicata
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