共查询到20条相似文献，搜索用时 15 毫秒
1.
Qifeng Yao Guanghui Ren Kai Xu Lianqing Zhu Hareem Khan Md Mohiuddin Muhammad Waqas Khan Bao Yue Zhang Azmira Jannat Farjana Haque Syed Zahin Reza Yichao Wang Xiaoming Wen Arnan Mitchell Jian Zhen Ou 《Advanced Optical Materials》2019,7(24)
Functional materials coated on optical fibers have demonstrated great potential for optical gas sensing applications. However, their sensitivity is typically limited to the sub‐parts per million (sub‐ppm) range. Here, for the first time a 2D near‐infrared plasmonic tungsten oxide (WOx) enabled ultrasensitive fiber optics gas sensor on a side‐polished D‐shape single mode optical fiber is presented. The plasmon resonance wavelength range of 2D WOx is matched with a conventional telecommunications wavelength of 1550 nm for driving the optical fiber, therefore inducing a strong light–matter interaction. Upon the surface adsorption of gas molecules, free electrons in the 2D WOx body are redistributed changing the plasmon resonance properties and hence the transmission through the optical fiber. The sensor is selectively responsive to NO2 at concentrations down to 44 parts per billion (ppb) with a limit of detection of 8 ppb at a relatively low elevated temperature. Such an excellent sensing performance is significantly improved over the previously reported fiber optics NO2 sensors, which suggests the integration of 2D plasmonic degenerated semiconductors as a viable approach to develop high‐performance fiber optics gas sensors. 相似文献
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Eric Udd 《Fiber and Integrated Optics》1992,11(4):319-336
Fiber optic sensors are finding increased usage in aerospace guidance and control applications due to their light weight, immunity to electromagnetic interference, high bandwidth and sensitivity, and solid-state, all-passive nature. This article reviews fiber optic sensors, with particular emphasis on aerospace applications. 相似文献
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Jingyuan Jia Yu Ban Kuan Liu Libang Mao Ying Su Meng Lian Tun Cao 《Advanced Optical Materials》2021,9(16):2100499
Next-generation color display entails miniaturization, reconfigurablity, flexibility, integration, and excellent workability. Recently, emerging 2D van der Waals materials offer a new opportunity to satisfy these requirements and attract intense attention, owing to their intrinsic in-plane anisotropy for polarization dependent photosensitivity, straightforward integration with complicated nanostructures, and efficient quantum confinement for good photodetecting performances. Nevertheless, reconfigurable color display in the visible region based on the 2D material stays elusive. Black phosphorus (BP) is a newly rising member of 2D family with intense optical anisotropy. Herein, the anisotropic BP crystals are explored as an optical dielectric for the visible spectrum, which possesses a polarization-dependent complex refractive index. A considerably large anisotropic ratio of BP enables polarized color displaying. It is experimentally and theoretically observed that the color from an air/BP/SiO2 multi-layered Fabry–Pérot cavity reversibly changes with the polarization angle, taking advantage of polarization-dependent complex refractive index of BP. The strategy offers a new prospect for developing next-generation polarization-dependent devices in data storage, anti-counterfeiting technologies, and color display. 相似文献
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Eric Udd 《Fiber and Integrated Optics》2013,32(4):319-336
Abstract Fiber optic sensors are finding increased usage in aerospace guidance and control applications due to their light weight, immunity to electromagnetic interference, high bandwidth and sensitivity, and solid-state, all-passive nature. This article reviews fiber optic sensors, with particular emphasis on aerospace applications. 相似文献
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Meng Zhang Qing Wu Feng Zhang Lingling Chen Xinxin Jin Yuwei Hu Zheng Zheng Han Zhang 《Advanced Optical Materials》2019,7(1)
2D nanomaterials are emerging as a promising platform for ultrashort‐pulse fiber laser technology. This review presents a catalog of the factors affecting the nonlinear optical properties of 2D nanomaterials and the recent progress in processing and integration strategies into saturable absorber devices as versatile, wideband ultrafast optical switches for fiber‐based‐laser short‐pulse generation. Particular focus is on black phosphorus, and a summary of the current status of black‐phosphorus‐based pulsed lasers is given, which provide new potential efficacy for this and other 2D nanomaterials in ultrafast photonic technology. 相似文献
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Sabriye Acikgoz Bukem Bilen Mustafa Muamer Demir Yusuf Ziya Menceloglu Yani Skarlatos Gulen Aktas Mehmet Naci Inci 《Optical Review》2008,15(2):84-90
Humidity induced change in the refractive index and thickness of the polyethylene glycol (PEG) coatings are in situ investigated for a range from 10 to 95%, using an optical waveguide spectroscopic technique. It is experimentally demonstrated
that, upon humidity change, the optical and swelling characteristics of the PEG coatings can be employed to build a plastic
fibre optic humidity sensor. The sensing mechanism is based on the humidity induced change in the refractive index of the
PEG film, which is directly coated onto a polished segment of a plastic optical fibre with dip-coating method. It is observed
that PEG, which is a highly hydrophilic material, shows no monotonic linear response to humidity but gives different characteristics
for various ranges of humidity levels both in index of refraction and in thickness. It undergoes a physical phase change from
a semi-crystalline structure to a gel one at around 80% relative humidity. At this phase change point, a drastic decrease
occurs in the index of refraction as well as a drastic increase in the swelling of the PEG film. In addition, PEG coatings
are hydrogenated in a vacuum chamber. It is observed that the hydrogen has a preventing effect on the humidity induced phase
change in PEG coatings. Finally, the possibility of using PEG coatings in construction of a real plastic fibre optic humidity
sensor is discussed. 相似文献
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长距离分布式光纤传感技术研究进展 总被引：6，自引：0，他引：6
分布式光纤传感技术是光纤传感领域的重要组成部分,具有以下突出优势:无需在光纤上制作传感器,传感光纤集传感与传输于一体,可实现远距离、大范围的传感与组网;可连续感知光纤传输路径上每一点的温度、应变、振动等物理参量的空间分布和变化信息,单根光纤上能获得多达数万点的传感信息.由于在长距离连续传感方面具有不可替代的优势,分布式光纤传感技术在周界安防、石油电力、大型结构等领域的安全监控方面具有非常广阔的应用前景.本文主要介绍电子科技大学光纤传感与器件研究团队在长距离分布式光纤静(布里渊光时域分析仪)、动(相位敏感型光时域反射仪)态参量传感技术取得的研究进展,包括基础与应用研究两个方面. 相似文献
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Sina Khorasani 《理论物理通讯》2018,70(3):344-360
We present a detailed calculation of the linear and nonlinear optical response of four types of monolayer twodimensional (2D) transition-metal dichalcogenides (TMDCs), having the formula MX2 with M=Mo, W and X=S, Se. The calculations are based on 6-band tight-binding model of TMDCs, and then performing a semi-classical perturbation analysis of response functions. We numerically calculate the linear χμν(1) (-ω;ω) and nonlinear surface susceptibility tensors χμνζη(3)(-ωΣ; ωr; ωs; ωt) with ωΣ=ωr+ωs+ωt. Both non-degenerate and degenerate cases are studied for thirdharmonic generation and nonlinear refractive index, respectively. Computational results obtained with no external fitting parameters are discussed regarding two recent reported experiments on MoS2, and thus we can confirm the extraordinarily strong optical nonlinearity of TMDCs. As a possible application, we demonstrate generation of a π/4-rotated squeezed state by means of nonlinear response of TMDCs, in a silica micro-disk resonator covered with the 2D material. Our proposed method will enable accurate calculations of nonlinear optical response, such as four-wave mixing and highharmonic generation in 2D materials and their heterostructures, thus enabling study of novel functionalities of 2D photonic integrated circuits. 相似文献
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A sensing fiber, with a gradually increasing Raman-gain-coefficient (gR/Aeff)along the fiber length, and which can keep the received Raman Stokes power constant in a distributed Raman-based Fiber-optic temperature Sensor, is proposed. This method can be an additional and easy way to further extend the sensing distance of the distributed Raman Fiber-optic temperature Sensor. 相似文献
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基于表面等离子体共振原理的空芯光纤传感器 总被引：2，自引：0，他引：2
设计了一种基于表面等离子体共振原理,使用空芯光纤作为光波导、外表面镀金属膜的光学材料圆柱体作为探头的新型折射率传感器.通过建立光学模型进行分析,在理论上推导出了这种传感器的传输光谱损耗公式,并针对该传感器在不同的光纤长度、探头材料、检测物质折射率等参数设置下的检测性能进行了分析,获得了各种参数对其性能的影响.由于该传感器可针对不同折射率的检测物质灵活地更换合适探头材料,相对于传统的表面等离子体共振光纤传感器,在易用性和性价比等方面具有更好的应用价值. 相似文献
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介绍了一种简单且灵敏度较高的Mach-Zehnder干涉湿度传感器.将单模光纤和多模光纤渐变熔接光纤锥,色散补偿光纤被熔接在两个多模渐变光纤之间,形成了单模光纤-光纤锥-多模渐变光纤-色散补偿光纤-多模渐变光纤-光纤锥-单模光纤结构的传感器.光纤锥起到了增加包层模能量的作用,两个多模渐变光纤节点作为光耦合器,从而形成光纤Mach-Zehnder干涉仪.外界环境湿度的变化,将使得传感器透射谱能量发生变化,通过测量干涉谱波峰峰值能量实现对湿度的测量.实验结果表明干涉谱波峰峰值能量与环境湿度之间存在良好的线性关系.当环境湿度在35%RH—85%RH范围内变化,一段由20 mm色散补偿光纤组成的传感器,其灵敏度为-0.0668 dB/%RH,相关度为0.995.该传感器结构紧凑、尺寸小、制造工艺简单,这使其可以被广泛用于湿度测量. 相似文献
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Wide‐spectral saturable absorption (SA) has been experimentally demonstrated in two‐dimensional (2D) nanomaterials with outstanding performance, such as low saturation intensity, deep modulation depth, and fast recovery time of excited carriers. Hence, 2D nanomaterials can be utilized as saturable absorbers for mode‐locking or Q‐switching to generate laser pulses with short duration and high repetition rate. Here, the SA properties of graphene, layered transition metal dichalcogenides, Group‐V elements, and other 2D nanomaterials are reviewed by summarizing their slow‐ or fast‐ saturable absorption behavior using the modified Frantz–Nodvik model or the steady‐state solution of Hercher's rate equations. The dependence of SA in 2D nanomaterials on excitation wavelength, linear absorption coefficient, and pulse duration is also explained. Finally, the applications of these 2D nanomaterials in a range of pulsed lasers are summarized. 相似文献
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Like Li Ya-nan Zhang Yifan Zhou Wanlu Zheng Yutong Sun Guoming Ma Yong Zhao 《Laser u0026amp; Photonics Reviews》2021,15(7):2000526
Optofluidic, as an emerging technology that combines photons and microfluidics, has become a powerful, intelligent, and universal sensing platform in the field of bio-chemical sensing. Optical fiber optofluidic (OFOF), as a branch of optofluidic technology, has stimulated a host of remarkable achievements in the field of bio-chemical sensing due to its superiority of compact structure, immunity to electromagnetic interference, low sample consumption, high sensitivity, and real-time dynamic response. In this paper, an overview of OFOF bio-chemical sensors is presented. The OFOF system architectures are introduced and some advanced functional materials and coating technologies that can be utilized in the OFOF sensing platform to achieve high-performance biochemical sensing are summarized. Research progress and current status of OFOF bio-chemical sensors based on various sensing mechanisms are summarized and analyzed, with emphases on their sensing principles, sensing structures, sensing applications, advantages, and disadvantages. Lastly, the existing challenges and future development trends of OFOF biochemical sensors are briefly discussed. 相似文献
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Yuning Zhang Jiayang Wu Linnan Jia Yang Qu Yunyi Yang Baohua Jia David J. Moss 《Laser u0026amp; Photonics Reviews》2023,17(3):2200512
Integrated photonic devices operating via optical nonlinearities offer a powerful solution for all-optical information processing, yielding processing speeds that are well beyond that of electronic processing as well as providing the added benefits of compact footprint, high stability, high scalability, and small power consumption. The increasing demand for high-performance nonlinear integrated photonic devices has facilitated the hybrid integration of novel materials to address the limitations of existing integrated photonic platforms. Recently, graphene oxide (GO), with its large optical nonlinearity, high flexibility in altering its properties, and facile fabrication processes, has attracted significant attention, enabling many hybrid nonlinear integrated photonic devices with improved performance and novel capabilities. This paper reviews the applications of GO to nonlinear integrated photonics. First, an overview of GO's optical properties and the fabrication technologies needed for its on-chip integration is provided. Next, the state-of-the-art GO nonlinear integrated photonic devices are reviewed, followed by comparisons of the nonlinear optical performance of different integrated platforms incorporating GO as well as hybrid integrated devices including different kinds of 2D materials. Finally, the current challenges and future opportunities in this field are discussed. 相似文献
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聚合物封装的高灵敏度光纤光栅温度传感器及其低温特性 总被引：10，自引：0，他引：10
介绍了一种新型的光纤光栅温度传感器。这种光纤光栅温度传感器使用了特殊的工艺将光纤布拉格光栅封装于一种热膨胀系数较大的有机聚合物基底中 ,使得传感器的温度灵敏性比裸光纤光栅提高了 12 .3倍 ,其温度灵敏度系数KT 达到 82 .6 9× 10 -6/℃。在 - 80～ 0℃的低温度范围内 ,对这种新型光纤光栅温度传感器的反射谱进行了测量。研究了这种新型光纤光栅温度传感器的低温特性 ,并与裸光纤光栅和铝基封装的光纤光栅进行了比较 ,结果表明这种新型的光纤光栅温度传感器具有很好的低温响应特性。 相似文献