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2. Dual-color Coherent Perfect Absorber

Author

Xue, Boyi, Lin, Jintian, Hou, Jiankun, Zhu, Yicheng, Ma, Ruixin, Chen, Xianfeng, Cheng, Ya, Ge, Li, and Wan, Wenjie

Subjects
Physics - Optics
Abstract

Perfect absorption of light critically affects light-matter interaction for various applications. Coherent perfect absorbers (CPA) gain the unique capability of controlling light with light in a linear fashion. Multi-color CPAs [Phys. Rev. Lett. 107, 033901] are highly desirable for broadband and nonlinear light-to-light coherent control, however, the experimental demonstration has still remained elusive. Here we experimentally observe a dual-color version of CPA (DC-CPA) through a second harmonic generation in a single whispering-gallery-mode microcavity. The DC-CPA enables simultaneous perfect absorption of both the incoming fundamental wave and its second harmonic. Similar to its linear counterpart, coherent control in the DC-CPA can be also realized by tuning the relative phase and intensity between the two-colored waves through nonlinear interference instead of the linear one. This scheme breaks the linear boundary of the traditional CPA into a multi-frequency domain and paves the way toward all-optically signal processing and quantum information.

Published
2024

5. Subwavelength Photorefractive Grating in a Thin-Film Lithium Niobate Microcavity

Author

Hou, Jiankun, Zhu, Jiefu, Ma, Ruixin, Xue, Boyi, Zhu, Yicheng, Lin, Jintian, Jiang, Xiaoshun, Chen, Xianfeng, Cheng, Ya, Ge, Li, Zheng, Yuanlin, and Wan, Wenjie

Subjects
Physics - Optics
Abstract

Subwavelength gratings play a fundamental and pivotal role in numerous science and applications for wave manipulation, exhibiting distinctive features such as filtering, phase manipulation, and anti-reflection. However, conventional fabrication methods for ultrasmall periodic structures are constrained by the fundamental optical diffraction limit, making it challenging to produce subwavelength gratings for optics. Here, we demonstrate a novel technique to build a reconfigurable subwavelength photorefractive grating (SPG) in a thin-film lithium niobate on the platform of an optical microcavity. Such SPGs are optically induced through the photorefractive effect and the subwavelength features originate from the spatial phase modulations of the pump's standing wave. The resulting SPGs lead to the mode splitting of two counter-propagating modes inside the microcavity, exhibiting an Electromagnetically Induced Transparency (EIT)-like transmission spectrum. Moreover, the unique subwavelength characteristic of SPGs enables first-order quasi-phase-matching for backward second-harmonic generation, a long-standing problem in nonlinear optics. Also, free-space-to-chip vertical nonlinear frequency conversion can be achieved in a similar manner. These results provide a flexible approach towards fabricating subwavelength gratings, which holds significant potential in various applications such as nonlinear frequency conversion, optical communication, sensing, and quantum technologies.

Published
2024
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6. Enhanced Frequency Conversion in Parity-Time Symmetry Line

Author

Hou, Jiankun, Zhu, Jiefu, Ma, Ruixin, Xue, Boyi, Zhu, Yicheng, Lin, Jintian, Jiang, Xiaoshun, Zheng, Yuanlin, Chen, Xianfeng, Cheng, Ya, Ge, Li, and Wan, Wenjie

Subjects
Physics - Optics
Abstract

Non-Hermitian degeneracies reveal intriguing and non-trivial behaviors in open physical systems. Examples like Parity-Time (PT) symmetry breaking, topological encircling chirality, and enhanced sensing near an exceptional point (EP) are often associated with the abrupt nature of the phase transition around these degeneracies. Here we experimentally observe a cavity-enhanced second-harmonic frequency (SHG) conversion on a PT symmetry line, i.e. a set consisting of open-ended isofrequency or isoloss lines, both terminated at EPs on the Riemann surface in parameter space. The enhancement factor can reach as high as 300, depending on the crossing point whether in the symmetry or the broken phase of the PT line. Moreover, such enhancement of SHG enables sensitive distance sensing with a nanometer resolution. Our works may pave the way for practical applications in sensing, frequency conversion, and coherent wave control.

Published
2024
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8. Multi-view Contrastive Learning Network for Recommendation

Author

Bu, Xiya, Ma, Ruixin, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Liu, Qingshan, editor, Wang, Hanzi, editor, Ma, Zhanyu, editor, Zheng, Weishi, editor, Zha, Hongbin, editor, Chen, Xilin, editor, Wang, Liang, editor, and Ji, Rongrong, editor

Published
2024
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9. Vessel Behavior Anomaly Detection Using Graph Attention Network

Author

Zhang, Yuanzhe, Jin, Qiqiang, Liang, Maohan, Ma, Ruixin, Liu, Ryan Wen, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Luo, Biao, editor, Cheng, Long, editor, Wu, Zheng-Guang, editor, Li, Hongyi, editor, and Li, Chaojie, editor

Published
2024
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24. Determination of 27 antiparasitic drug residues in Penaeus vannamei by liquid chromatography-tandem mass spectrometry simultaneously

Author

ZHANG Lifang, MA Ruixin, ZHENG Baiqin, SONG Wang, and ZHOU Xin

Subjects
penaeus vannamei, antiparasitic drug, ultra-high performance liquid chromatography-tandem mass spectrometry, matrix effect, Food processing and manufacture, TP368-456
Abstract

Objective: An ultra-high performance liquid chromatography-tandem mass spectrometry method was established for the simultaneous determination of 27 antiparasitic drug residues in Litopenaeus vannamei. Methods: The solution was used to extract antiparasitic drugs in the samples of L. vannamei. The supernatant after centrifugation was purified by C18 and neutral alumina powder. The sample solution was analyzed by ultra-high performance liquid chromatography-tandem mass spectrometry and applied to the instrument workstation to perform data analysis. A Thermo Hypersil Gold aQ column was used as the separation column, and 0.1% formic acid acetonitrile and 10 mmol/L ammonium formate solution （containing 0.1% formic acid） were invoked as the organic phase and the aqueous phase for gradient elution, respectively. The electrospray ion source was used for positive and negative ion synchronous scanning and multiple reaction monitoring modes. The ion abundance ratio was qualitative, and the matrix-matched reference solution external standard method was employed for quantitative analysis. The results showed that the Pearson correlation coefficient （r） of 27 antiparasitic drugs was greater than 0.974 1 in a certain concentration range, and the linear relationship was good. Results: The detection limit was 0.5~2.0 μg/kg, and the quantification limit was 2~5 μg/kg; The recoveries （n=6） of the method spiked at the low, medium and high concentration levels of the samples were 61.90%~118.54%, the intra-assay coefficient of variation （n=6） was 0.57%~12.56%, and the inter-assay coefficient of variation （n=3） was 1.29%~16.47%. Conclusion: The method has good selectivity, high method recovery rate, high precision, and short measurement period, provides a robust and efficient method for the determination of antiparasitic drugs in the laboratory, and meets the testing needs of the laboratory.

Published
2023
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47. Multi-attention User Information Based Graph Convolutional Networks for Explainable Recommendation

Author

Ma, Ruixin, Lv, Guangyue, Zhao, Liang, Ma, Yunlong, Zhang, Hongyan, Liu, Xiaobin, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Memmi, Gerard, editor, Yang, Baijian, editor, Kong, Linghe, editor, Zhang, Tianwei, editor, and Qiu, Meikang, editor

Published
2022
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