We present a lens-free, solid-state structured light imaging system utilizing a 1×64 optical switch array of large-aperture slanted grating antennas. The proposed design removes the constraints of conventional lens-assisted or optical phased arrays illuminators, enabling a large field of view of 100°×8° without limitations concerning active optical alignment or aliasing side lobes.

ABSTRACT Pushing sensor sensitivity to the extreme remains a central pursuit in sensing research. However, the limit of detection (LOD) is ultimately limited by the trade‐off between intrinsic sensitivity and noise: improvements in sensitivity often introduce higher noise, yielding only marginal gains in LOD. Here, we leverage mode splitting in meta‐waveguide microring resonators (MWMRs)—a typically overlooked phenomenon—to suppress drift‐induced bias and noise without sacrificing interfacial refractive‐index sensitivity. This approach reduces baseline drift to just 4.6 fm/min during representative measurements, enabling quantitative detection of ultra‐weak surface perturbations. The sensing performance is validated through the streptavidin‐biotin interaction, achieving reliable detection of 0.01 pg/mL streptavidin with a blank reference and a splitting noise of 1.3 pm. This reflection‐induced mode splitting framework breaks the longstanding LOD bottleneck in surface refractometric sensing and establishes MWMRs as a robust, drift‐immune platform for ultra‐sensitive optical interrogation.

We propose a low-threshold silicon photonic diode based on nanocylinder-loaded silicon microring. Benefiting from the small mode volume, high Q factor, and manipulable chirality, the proposed diode achieves a low threshold of similar to -7.83 dBm.

We propose and demonstrate a focal plane switch array (FPSA) comprising juxtaposed slanted grating antennas as transceiving elements with strong crosstalk suppression and quasi-monostatic depth of field. By intentionally shifting the focal plane of the lens, the array is capable of circulator-free LiDAR operation.

We demonstrate a nonreciprocal transmission in photonic integrated circuits based on a chiral silicon microring. Nonreciprocal light propagation is achieved with a nonreciprocal bandwidth exceeding 15 GHz and an insertion loss below 0.2 dB. (c) 2024 The Author(s)

In order to carry out the strategy of invigorating China through science and education, to support the high-quality development of education, and to cope with the changing internal and external environment and service needs, the 15 th Creative Forum for Library Management and Service（CFLMS） was held under the theme of “management and service of academic libraries in the context of new technologies: innovation on upholding fundamental principles”. The forum extensively and deeply discussed the hot issues of librarianship to support the “Double First-Class” initiative, such as academic library construction strategies, development of smart library, new academic communication platforms, innovation of university discipline services, and evolution of university library functions. The article presents a comprehensive overview of the main contents of the forum, aiming at sharing the special cases of each library and exploring new ideas for the high-quality development of libraries in the context of new technologies.

第十六届图书馆管理与服务创新论坛于2023年10月18-20日在上海交通大学图书馆举办,论坛以"科技·人才·创新:变革教育背景下的高校图书馆发展"为主题,来自全国近130所院校及单位的300余名代表参会.论坛设有大会报告、青年之声、优秀论文分享、海报展示、实践场馆参观等环节.与会的业界及学界专家围绕信息资源数据服务、图书馆智慧服务、人工智能的应用、跨学科交叉融合的信息服务发展以及未来学习中心的建设等内容进行了深入研讨.文章综述了此次论坛专家报告的主旨思想,为促进图书馆新时代数字化转型,提升管理效能,创新服务模式提供理论参考与实践经验.

The construction of librarian team is the cornerstone of the stable development of librarianship. Looking back on 40 years of development, Shanghai Jiao Tong University Library has always focused on closely the talent strategy for university development, running through two keywords of academic and innovative in the construction of librarian team. Under the continuous optimization of the organization and the librarian team, a path of the construction of an innovative librarian team has been established. Specifically, it includes a concept, three vision requirements, a set of system, and four core abilities. Through the path, a high level librarian team can be cultivated, in order to achieve a standard, smart and special information knowledge service center that matches the world’s first-class university.

In this paper, multi-core fiber combined with IQ modulated optical frequency domain reflectometer (OFDR) system scheme is proposed for strain vector sensing in water and the maximum error after correction for the measured curvature is 1.71%.

Typically, the realization of strain vector sensing based on traditional optical fiber sensing is difficult. To address this, in this study, a multi-core optical fiber strain vector sensing system based on an in-phase and quadrature ( IQ) modulated optical frequency domain reflector ( OFDR) is designed and verified. The IQ modulation technique is used to perform a linear frequency sweep of the light source, and the strain vector information of a seven-core fiber after bending is obtained from the OFDR system using the spatial structure relation of multi- core fibers. Experimental results demonstrate that the spatial resolution of the bending strain is 28. 35 cm in an 87 m seven- core fiber with a sweep frequency of 990 MHz. When the bending curvature of the optical fiber is 1. 78 m(-1), the angular resolution is 29 degrees. Moreover, the simulation analysis indicates that when the sweep frequency range increases to 10 GHz, a theoretical angular resolution of 1. 02 degrees can be achieved, which can further improve the system performance.

数字化与网络化颠覆了各行各业的发展,大学图书馆也不例外.大学图书馆是大学发展的重要基石,过去半个世纪以来,已经基本完成从纸质图书资源供给向电子化资源供给的转变,目前正在向多元化发展.面向未来的学习中心建设是新时代中国高等教育在图书馆空间建设领域的领跑战略.此文介绍了上海交通大学图书馆的实践案例,总结了在建设未来学习中心的理念指导下,图书馆空间建设的三个核心要点:沉浸式阅读促进用户深度学习;多元化体验满足用户全方位感知;交互性虚拟现实推动新技术持续迭代.

A light-induced tunable microfiber-based Bragg grating (MF-BG) overlaid with a high refractive index (HRI) photoresponsive liquid crystal (PLC) film is proposed. Around a specific overlay HRI, the refractive index (RI) of the fundamental mode can be tailored to an optimal region by adjusting the overlay thickness and selecting the MF-BG diameter. This optimization makes the device have extended tuning range, low insertion loss, and relative high extinction ratio. The maximum wavelength shift of 1.32 nm is achieved in our experiment under 0.5 mW/mm2 Ar+ laser illuminating.

We demonstrate a monolithic frequency-modulated continuous-wave (FMCW) lidar chip with an integrated transceiver array based on lens-assisted beam steering (LABS) technology. It enables beam emitting, steering, receiving, and coherent detecting on a single chip with simultaneous distance and velocity detection. An integrated transceiver is designed with a composite structure of a Bragg grating in the middle and a U-shaped photodetector (PD) surrounding it. For a proof-of-concept demonstration, a chip with 2 × 2 switchable transceiver array is fabricated. A monolithic coherent LABS lidar system with a scanning angle of 2.86° and a scanning speed of 5.3 µs is implemented for 5 m ranging and 0.45 m/s velocity detection.

Conventional method of estimating Brillouin Frequency Shift (BFS) in fiber is timewasting. A novel method based on Principal Components Analysis (PCA) of a fast measurement for BFS without sacrifice of accuracy is proposed. OCIS codes: (290.5900) Scattering, stimulated Brillouin, (200.4260) Neural networks

An FMCW (frequency-modulated continuous-wave) Lidar system based on cylindrical lens assisted two-dimensional beam steering is demonstrated. It is tested in ranging experiment for lm-distance target detection with an FOV of 11.3°×8.1°.

We demonstrate a blind zone-suppressed and flash-emitting solid-state Lidar based on lens-assisted beam-steering technology. As a proof-of-concept demonstration, with the design of a subwavelength-gap 1D long-emitter array and multiwavelength flash beam emitting, the device was measured to have 5% blind zone suppression, 0.06°/point-deflection step, and 4.2 μs scanning speed. In time-of-flight ranging experiments, Lidar systems have a field of view of 11.3 ° × 8.1 ° (normal device) or 0.9 ° × 8.1 ° (blind-zone suppressed device), far-field number of resolved points of 192, and a detection distance of 10 m. This work demonstrates the possibility that a new integrated beam-steering technology can be implemented in a Lidar without sacrificing other performance.

We demonstrate a monolithic transceiver based on a CMOS-compatible silicon photonic platform for lens-assisted beam-steering (LABS) light detecting and ranging (Lidar) application. By implementing an on-chip two-dimensional transceiver array and off-chip lens, beam emitting, steering, and receiving are realized simultaneously on a single chip. The transceiver is designed with a structure of a U-shaped vertical Ge photodetector surrounding a grating for high-efficiency light transmission and reception. The on-chip photodetector has a bandwidth of 87 MHz, a responsivity of 0.3A/W, and a detection sensitivity of -20dBm. For proof-of-concept demonstration, a time-of-flight Lidar system is achieved for target ranging with a detection distance of 5.2 m, a scanning angle of 2.86°, and a scanning speed of 5.3µs . This work demonstrates a feasible solution to integrated Lidar with beam emitting and receiving on one single chip based on LABS.

We present a solid-state light detection and ranging system with a hybrid beam-steering technology. A blind zone-suppressed TOF Lidar is demonstrated with a field of view of 0.9°×8.1° and a resolution point of 192.

Brillouin scattering-based distributed optical fiber sensors have been successfully employed in various applications in recent decades, because of benefits such as small size, light weight, electromagnetic immunity, and continuous monitoring of temperature and strain. However, the data processing requirements for the Brillouin Gain Spectrum (BGS) restrict further improvement of monitoring performance and limit the application of real-time measurements. Studies using Feedforward Neural Network (FNN) to measure Brillouin Frequency Shift (BFS) have been performed in recent years to validate the possibility of improving measurement performance. In this work, a novel FNN that is 3 times faster than previous FNNs is proposed to improve BFS measurement performance. More specifically, after the original Brillouin Gain Spectrum (BGS) is preprocessed by Principal Component Analysis (PCA), the data are fed into the Feedforward Neural Network (FNN) to predict BFS.

2020年是"十三五"建设收官、"十四五"规划开局的关键之年,面对不断变幻的信息环境和用户需求,第十三届图书馆管理与服务创新论坛围绕与图书馆服务与管理创新密切相关的热点问题,通过"数据、服务、管理:规划与突破——畅想Lib2035"这一主题,广泛深入地探讨图书馆在新时代背景下的创新转型和可持续发展策略,立足高校图书馆的中长期发展,探求如何更好地为学校教学科研和战略发展提供高质量的服务保障.文章总结凝练了本次论坛的特色、内容与亮点,探索图书馆事业"十四五"规划及高质量发展的新思路.