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学者姓名：黄衍堂
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Abstract ：
The upconversion luminescence at the visible band was excited by the high power density whispering gallery mode (WGM) on the surface of the microsphere. Under the WGM excitation, Er3+ of NaYF4:Er3+ directly absorbed three photons at 1525 nm, followed by the generation of upconversion luminescence. We used WS2 quantum dots (QDs) as donors and NaYF4:Er3+ upconversion nanoparticles (UCNPs) as acceptors to enhance upconversion luminescence by Förster resonant energy transfer (FRET). The physical mixture composed of monolayer WS2 and NaYF4:Er3+ nanoparticles was coated on SiO2 microsphere by immersion method. Excited by high power density WGM, three photons were absorbed by WS2-QDs based on the quantum size effect to generate excited electrons as donors and UCNPs as acceptors based on FRET, subsequently, the energy of the electrons were transferred to the luminescence center Er3+ to improve the upconversion luminescence efficiency. The mechanism model of upconversion luminescence enhancement based on FRET of WS2–NaYF4:Er3+ was proposed, and the enhancement effect was experimentally studied and demonstrated. To study the distance dependence of energy transfer between QD and UCNP pairs, we covered the surface of the silica microsphere with a controlled concentration of WS2 mixed with NaYF4:Er3+ nano-particles. When the mixed concentration of WS2-QDs was 0.15%, the upconversion luminescence reached the highest efficiency. The results showed that a twofold upconversion luminescence enhancement can be experimentally achieved. The proposed approach for enhancing the upconversion luminescence could benefit the improvement of imaging signal-to-noise ratio (SNR) using UCNPs for fluorescent labels in life sciences. © 2024 Elsevier B.V.
Keyword ：
Energy transfer Energy transfer Erbium compounds Erbium compounds Forster resonance energy transfer Forster resonance energy transfer Microspheres Microspheres Nanocrystals Nanocrystals Optical resonators Optical resonators Photons Photons Semiconductor quantum dots Semiconductor quantum dots Signal to noise ratio Signal to noise ratio Silica Silica SiO2 nanoparticles SiO2 nanoparticles Sodium compounds Sodium compounds Tungsten compounds Tungsten compounds Two photon processes Two photon processes Whispering gallery modes Whispering gallery modes
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| GB/T 7714 | Huang, Yantang , He, Xinyu , Liao, Songsong et al. Enhanced upconversion luminescence of NaYF4:Er nanocrystals based on the synergy between whispering gallery mode excitation and förster resonant energy transfer [J]. | Optical Materials , 2024 , 150 . |
| MLA | Huang, Yantang et al. "Enhanced upconversion luminescence of NaYF4:Er nanocrystals based on the synergy between whispering gallery mode excitation and förster resonant energy transfer" . | Optical Materials 150 (2024) . |
| APA | Huang, Yantang , He, Xinyu , Liao, Songsong , Tu, Bifeng , Xu, Canhua , Huang, Wenqi et al. Enhanced upconversion luminescence of NaYF4:Er nanocrystals based on the synergy between whispering gallery mode excitation and förster resonant energy transfer . | Optical Materials , 2024 , 150 . |
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According to the principle of blackbody radiation, the experimental exploration of high temperature optical fiber temperature sensor was carried out. The high temperature resistant calcium tungstate material was used as the blackbody radiation material to be made the optical fiber radiation probe. Optical power meter was used to measure the optical power of 980nm wavelength in every 10°C in the range of 150-800°C. The fourth-order polynomial was used to fit the relationship between the radiation optical power and the temperature, and the fourth-order optical power and temperature expression with a fitting degree of 0.99953 was obtained. The temperature measurement accuracy was within 1 % in the temperature range of 400-800 ℃. © 2024 SPIE.
Keyword ：
Heat radiation Heat radiation Optical fibers Optical fibers Temperature measurement Temperature measurement Temperature sensors Temperature sensors Tungsten compounds Tungsten compounds
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| GB/T 7714 | He, Pengyu , Wu, Luzhu , Liu, Huiyuan et al. High temperature optical fiber temperature sensor based on blackbody thermal radiation [C] . 2024 . |
| MLA | He, Pengyu et al. "High temperature optical fiber temperature sensor based on blackbody thermal radiation" . (2024) . |
| APA | He, Pengyu , Wu, Luzhu , Liu, Huiyuan , Feng, Baihe , Huang, Yantang . High temperature optical fiber temperature sensor based on blackbody thermal radiation . (2024) . |
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Optical microcavity can confine photons to a tiny scale for a long time, and is an integrated, low-loss, small mode volume resonant cavity. The resonant frequency of WGM microcavities can be tuned by changing the refractive index and size of the cavity.Based on previous research, this paper proposes a micro-mushroom-shaped microcavity and illustrates the preparation method and characteristics of optical micro-mushroom cavities made of quartz materials. Through the photo-thermal effect, heated light was injected in along the handle of the micro-mushroom cavity, and the frequency tuning of the micro-cavity was thus achieved through the photo-thermal-optical conversion. © 2024 SPIE.
Keyword ：
Microcavities Microcavities Natural frequencies Natural frequencies Refractive index Refractive index
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| GB/T 7714 | Liao, Songsong , Tu, Bifeng , Xu, Huiyang et al. All-optical tuned optical micro-mushroom cavity resonance wavelength [C] . 2024 . |
| MLA | Liao, Songsong et al. "All-optical tuned optical micro-mushroom cavity resonance wavelength" . (2024) . |
| APA | Liao, Songsong , Tu, Bifeng , Xu, Huiyang , Feng, Baihe , Huang, Yantang . All-optical tuned optical micro-mushroom cavity resonance wavelength . (2024) . |
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In this work, a ligand-free luminescent hydrogel is used as a visual ratiometric fluorescence sensor to detect rare-earth (RE) ions for the first time. This hydrogel is easy to be prepared, environmentally friendly, and has high luminescent efficiency. It is found that the fluorescence intensity and emission color of the hydrogel immediately change significantly when solution of active RE3+ ions is added without any treatment. According to the linear relationship between the fluorescence intensity ratio and the concentration of RE3+ solutions, the detection limit is calculated to be as low as 0.94 μM. The detection of RE ions has strong anti-interference to other ions. Therefore, this sensor can be used for preliminary field exploration of RE ores and detection of waste containing small amounts of RE ions. © 2024 Elsevier B.V.
Keyword ：
Fluorescence sensor Fluorescence sensor Ligand-free hydrogel Ligand-free hydrogel Rare-earth ions Rare-earth ions Visual detection Visual detection
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| GB/T 7714 | Zhang, Y. , Lin, L. , Wu, Y. et al. A ligand-free hydrogel as a visual fluorescence sensor for detection of rare-earth ions [J]. | Optics Communications , 2024 , 570 . |
| MLA | Zhang, Y. et al. "A ligand-free hydrogel as a visual fluorescence sensor for detection of rare-earth ions" . | Optics Communications 570 (2024) . |
| APA | Zhang, Y. , Lin, L. , Wu, Y. , Gong, C. , Feng, Z. , Wang, Z. et al. A ligand-free hydrogel as a visual fluorescence sensor for detection of rare-earth ions . | Optics Communications , 2024 , 570 . |
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In this paper, a very simple method was used to synthesize ligand-free luminous hydrogels doped with Tb3+ and Eu3+. The hydrogels exhibit red (615 nm), green (544 nm) and blue (425 nm) emissions derived from Tb3, Eu3+ and defects, respectively. Effective energy transfer from Tb3+ to Eu3+ is observed. We apply these ligand-free luminous hydrogels for temperature sensing for the first time. In surprise, the relative sensitivities are all very high (>2 %/K) by using many kinds of fluorescence intensity ratios. In addition, with the increase of temperature, the emission color of the samples changes significantly (from orange-red to blue) which can be applied for visual temperature sensing. The above results infer that the ligand-free luminous hydrogels can be used as an eco-friendly visual temperature sensing material. © 2024 Elsevier B.V.
Keyword ：
High-sensitive High-sensitive Ligand-free Ligand-free Luminous hydrogel Luminous hydrogel Rare earth Rare earth Temperature sensing Temperature sensing
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| GB/T 7714 | Zhang, Y. , Lin, L. , Wu, Y. et al. Visual high-sensitive temperature sensing of a novel rare-earth doped ligand-free luminous hydrogel [J]. | Optical Materials , 2024 , 155 . |
| MLA | Zhang, Y. et al. "Visual high-sensitive temperature sensing of a novel rare-earth doped ligand-free luminous hydrogel" . | Optical Materials 155 (2024) . |
| APA | Zhang, Y. , Lin, L. , Wu, Y. , Zhang, M. , Ma, W. , Ju, N. et al. Visual high-sensitive temperature sensing of a novel rare-earth doped ligand-free luminous hydrogel . | Optical Materials , 2024 , 155 . |
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Fluorescence fluctuation-based super-resolution microscopy (FF-SRM) is an economical and widely applicable technique that significantly enhances the spatial resolution of fluorescence imaging by capitalizing on fluorescence intermittency. However, each variant of FF-SRM imaging has inherent limitations. This study proposes a super-resolution reconstruction strategy (synSRM) by synergizing multiple variants of the FF-SRM approach to address the limitations and achieve high-quality and high-resolution imaging. The simulation and experimental results demonstrate that, compared to images reconstructed using single FF-SRM algorithms, by selecting suitable synSRM routes according to various imaging conditions, further improvements of the spatial resolution and image reconstruction quality can be obtained for super-resolution fluorescence imaging. © 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.
Keyword ：
Fluorescence imaging Fluorescence imaging Fluorescence microscopy Fluorescence microscopy Image resolution Image resolution
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| GB/T 7714 | Zeng, Zhiping , Xu, Biqing , Qiu, Jin et al. Fluorescence super-resolution microscopy via fluctuation-based multi-route synergy [J]. | Biomedical Optics Express , 2024 , 15 (10) : 5886-5900 . |
| MLA | Zeng, Zhiping et al. "Fluorescence super-resolution microscopy via fluctuation-based multi-route synergy" . | Biomedical Optics Express 15 . 10 (2024) : 5886-5900 . |
| APA | Zeng, Zhiping , Xu, Biqing , Qiu, Jin , Chen, Xinyi , Huang, Yantang , Xu, Canhua . Fluorescence super-resolution microscopy via fluctuation-based multi-route synergy . | Biomedical Optics Express , 2024 , 15 (10) , 5886-5900 . |
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An optical apparatus was proposed in this paper that allows simultaneously equal-optical-path imaging of both front and rear end surfaces of the thermoelectric cooler (TEC) components. This optical apparatus can be used to simultaneously inspect surface defects on both front and rear end surfaces in the traveling direction of the TEC components. Two sets of right-angle relay prisms and one image combiner are used to build an optical apparatus for simultaneously equal-optical-path imaging of both front and rear end surfaces of TEC components. The experiments of defects inspecting both front and rear end surfaces of the TEC components were carried out. The inspecting apparatus was used to collect 10, 000 images and the ResNet50 deep residual learning network was used to extract and learn its features. The accuracy of the trained model of 94.8% was obtained and the average inspection time for a single image was around 58ms. The experimental results show that the proposed optical inspecting apparatus can ensure the clear imaging of TEC components on both front and rear end surfaces on the CMOS sensor. It meets the requirements of TEC components end surface defects inspection and simplifies the system configuration, reduces the system cost, and improves the system reliability. © 2023 SPIE.
Keyword ：
Computer vision Computer vision Cooling systems Cooling systems Deep learning Deep learning Inspection Inspection Learning systems Learning systems Machine components Machine components Optical data processing Optical data processing Surface defects Surface defects Thermoelectric equipment Thermoelectric equipment
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| GB/T 7714 | Lin, Xiaodan , Wu, Weibin , Yan, Shaobin et al. Investigations on defects inspecting apparatus and image processing technique for end surfaces of thermoelectric cooler components [C] . 2023 . |
| MLA | Lin, Xiaodan et al. "Investigations on defects inspecting apparatus and image processing technique for end surfaces of thermoelectric cooler components" . (2023) . |
| APA | Lin, Xiaodan , Wu, Weibin , Yan, Shaobin , Gao, Wanpeng , Huang, Yantang , Liao, Tingdi . Investigations on defects inspecting apparatus and image processing technique for end surfaces of thermoelectric cooler components . (2023) . |
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The Er3+ doped double perovskite Ba2CaWO6 crystal is a promising ratiometric thermometer based on the fluorescence intensity ratio (FIR) of transitions from H-2(11/2) and S-4(3/2) to the lowered I-4(15/2) level. However, the Ca2+ vacancy defect caused by the charge difference between rare-earth ions and the substituted alkaline-earth ions gives rise to the non-radiative probability and limits the thermal sensitivity. Here, the up-conversion luminescence and thermometric performance of Er3+, Yb3+ doped Ba2CaWO6 are tuned by tri-doping with alkaline ions. The Ca2+ vacancy defect can be eliminated by the introduction of Na+, which occupies the Ca2+ site when it is doped into Ba2CaWO6 with Er3+ and Yb3+. On the contrary, the doping of Cs+ into Ba2CaWO6 with Er3+ and Yb3+ enhances the defect concentration because it occupies the site of Ba2+. Thus, the tri-doping of Na+ reduces the non-radiative probability and enhances the quantum efficiency of Er3+, leading to the improvement of the thermometric sensitivity of Ba2CaWO6. As a result, we get an excellent thermometric Ba2CaWO6:8%Yb3+,3.5%Er3+,6%Na+ powder with a luminescence lifetime of 515 ms and maximum thermal sensitivity (S-r) of 1.45%/K, which is more than three times higher than that of the BCWO:Er3+ powder. (c) 2022 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
Keyword ：
Ba2CaWO6 Ba2CaWO6 Double perovskite Double perovskite Er3+ Er3+ Optical thermometry Optical thermometry Rare earths Rare earths Up-conversion luminescence Up-conversion luminescence
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| GB/T 7714 | Li, Lingyun , Zhou, Ziwei , Huang, Fazheng et al. Improving luminescence and thermometric performance of Ba2CaWO6:Er3+ by tri-doping with Yb3+ and Na+ [J]. | JOURNAL OF RARE EARTHS , 2023 , 41 (1) : 42-50 . |
| MLA | Li, Lingyun et al. "Improving luminescence and thermometric performance of Ba2CaWO6:Er3+ by tri-doping with Yb3+ and Na+" . | JOURNAL OF RARE EARTHS 41 . 1 (2023) : 42-50 . |
| APA | Li, Lingyun , Zhou, Ziwei , Huang, Fazheng , Peng, Senlin , Huang, Yantang , Wang, Guoqiang et al. Improving luminescence and thermometric performance of Ba2CaWO6:Er3+ by tri-doping with Yb3+ and Na+ . | JOURNAL OF RARE EARTHS , 2023 , 41 (1) , 42-50 . |
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Automatic optical inspection technology (AOI) is a visual inspection technology that has developed rapidly in recent years. The high speed and accuracy of AOI can greatly enhance the efficiency of modern industrial production. However, when this technology is applied to optical components inspection, it encounters a challenge that the specular highlight induces over or under exposure during the imaging process, and further results in a low imaging contrast and unclear defect details of the targets. To solve this problem, a dark-field polarization imaging setup based on a division-of-focal-plane polarization camera was adopted to achieve high contrast defect images. Meanwhile, algorithms based on the improved LeNet-5 convolutional neural network were developed to recognize the defects. An accuracy above 99.5% was obtained for the distinction of defective and non-defective samples, and an accuracy of 94.4% was reached for the various defect classification. Our work demonstrated an effective application of polarization imaging and machine learning in AOI of optical components manufacturing.
Keyword ：
convolutional neural network convolutional neural network defect detection defect detection LeNet-5 LeNet-5 polarization imaging polarization imaging
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| GB/T 7714 | Xu, Canhua , Zheng, Daifu , Huang, Yantang et al. Defect inspection of optical components based on dark-field polarization imaging and convolutional neural network recognition algorithms [J]. | OPTICAL ENGINEERING , 2023 , 62 (4) . |
| MLA | Xu, Canhua et al. "Defect inspection of optical components based on dark-field polarization imaging and convolutional neural network recognition algorithms" . | OPTICAL ENGINEERING 62 . 4 (2023) . |
| APA | Xu, Canhua , Zheng, Daifu , Huang, Yantang , Zeng, Zhiping . Defect inspection of optical components based on dark-field polarization imaging and convolutional neural network recognition algorithms . | OPTICAL ENGINEERING , 2023 , 62 (4) . |
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Pancharatnam Berry (PB) phase optical elements can manipulate local polarization state of light in the cross-sectional plane by addressing an additional PB phase relating to the orientation of the optical axis of the waveplate-like structure. However, chromatic aberration including spectrum-dependent retardation and diffraction efficiency limits their applications in the field of visible broadband imaging and display. In this article, the chromatic aberration of a liquid crystal (LC) PB phase lens was measured by a home-built RGB full -Stokes imaging polarimeter. The chirality conversion efficiency and depolarization at RGB wavelengths can be calculated from the measured Stokes vectors. Our experiments show that even the spectrum-dependent retar-dation exists, the measured PB phase lens has a uniform and high diffraction efficiency in the visible band. Affected by the local LC molecule, the input polarization of RGB light was rotated in varying degrees, but the focusing or defocusing manipulation to the right-or left-hand circular polarization, originated from the PB phase, results in fixed focal lengths for different colors. Our experiments show that the LC-based PB phase lens is suitable for the visible broadband applications.
Keyword ：
Chromatic aberration Chromatic aberration Full-Stokes' RGB imaging Full-Stokes' RGB imaging LCVR LCVR Pancharatnam Berry phase Pancharatnam Berry phase
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| GB/T 7714 | Xu, CanHua , Zhou, Tian , Zheng, DaiFu et al. Chromatic aberration measurement of liquid crystal Pancharatnam Berry phase lens by a RGB full-Stokes imaging polarimeter [J]. | OPTICS AND LASER TECHNOLOGY , 2023 , 166 . |
| MLA | Xu, CanHua et al. "Chromatic aberration measurement of liquid crystal Pancharatnam Berry phase lens by a RGB full-Stokes imaging polarimeter" . | OPTICS AND LASER TECHNOLOGY 166 (2023) . |
| APA | Xu, CanHua , Zhou, Tian , Zheng, DaiFu , Ma, Jing , Huang, YanTang , Zeng, ZhiPing . Chromatic aberration measurement of liquid crystal Pancharatnam Berry phase lens by a RGB full-Stokes imaging polarimeter . | OPTICS AND LASER TECHNOLOGY , 2023 , 166 . |
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