Photonics Research
Lan Yang
Contents 1 Issue (s), 3 Article (s)
Vol. 12, Iss.7—Jul.1, 2024 • pp: 1371-1409 Spec. pp:
Research ArticlesVol. 12, Iss.7-Jul..1,2024
Instrumentation and Measurements
Two-dimensional flow vector measurement based on all-fiber laser feedback frequency-shifted multiplexing technology
Lei Zhang, Jialiang Lv, Yunkun Zhao, Jie Li, Keyan Liu, Qi Yu, Hongtao Li, Benli Yu, and Liang Lu

The decomposition and identification of signals are crucial for flow vector acquisition in a multi-dimensional measurement. Here, we proposed a two-dimensional (2D) flow vector measurement system based on all-fiber laser feedback frequency-shifted multiplexing technology. The reliable performance of the system is characterized by experimental verification and numerical simulation. An orthogonal dual-beam structure is employed to eliminate the impact of an unknown incident angle in the practical application. Meanwhile, the vector velocity signals in 2D can be decomposed into one-dimensional (1D) scalar signals by adopting the frequency-shifted multiplexing, which makes it easy to obtain the vector information and velocity distribution of fluid motion through the self-mixing interference frequency spectrum. Moreover, the measured flow rates present a high linearity with syringe pump speeds ranging from 200 to 2000 μL/min, and the velocity information of the different incidence angles is easily obtained with high precision. This work may pave the way for the acquisition and processing of multi-dimensional flow vector signals, with potential applications in biomedical monitoring and microflow velocity sensing.

Photonics Research
Jun. 05, 2024, Vol. 12 Issue 7 1371 (2024)
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Optical Devices
Broadband intelligent programmable metasurface with polarization-modulated self-adaptive electromagnetic functionality switching
Ximing Li, Rui Xu, Xiaofeng Sun, Yuan Zhao, Zhao Yang, and Guohong Du

Programmable metasurfaces have received a great deal of attention due to their ability to dynamically manipulate electromagnetic (EM) waves. Despite the rapid growth, most of the existing metasurfaces require manual control to switch among different functionalities, which poses severe limitations on practical applications. Here, we put forth an intelligent metasurface that has self-adaptive EM functionality switching in broadband without human participation. It is equipped with polarization discrimination antennas (PDAs) and feedback components to automatically adjust functionalities for the different incident polarization information. The PDA module can first perceive the polarization of incident EM waves, e.g., linear or circular polarization, and then provide the feedback signal to the controlling platform for switching the EM functionality. As exemplary demonstrations, a series of functionalities in the 9–22 GHz band has been realized, including beam scanning for x-polarization, specular reflection for y-polarization, diffuse scattering for left-handed circular polarization (LCP), and vortex beam generation for right-handed circular polarization (RCP) waves. Experiments verify the good self-adaptive reaction capability of the intelligent metasurface and are in good agreement with the designs. Our strategy provides an avenue toward future unmanned devices that are consistent with the ambient environment.

Photonics Research
Jun. 05, 2024, Vol. 12 Issue 7 1395 (2024)
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Quantum Optics
On-chip source-device-independent quantum random number generator
Lang Li, Minglu Cai, Tao Wang, Zicong Tan, Peng Huang, Kan Wu, and Guihua Zeng

Quantum resources offer intrinsic randomness that is valuable for applications such as cryptography, scientific simulation, and computing. Silicon-based photonics chips present an excellent platform for the cost-effective deployment of next-generation quantum systems on a large scale, even at room temperature. Nevertheless, the potential susceptibility of these chips to hacker control poses a challenge in ensuring security for on-chip quantum random number generation, which is crucial for enabling extensive utilization of quantum resources. Here, we introduce and implement an on-chip source-device-independent quantum random number generator (SDI-QRNG). The randomness of this generator is achieved through distortion-free on-chip detection of quantum resources, effectively eliminating classical noise interference. The security of the system is ensured by employing on-chip criteria for estimating security entropy in a practical chip environment. By incorporating a photoelectric package, the SDI-QRNG chip achieves a secure bit rate of 146.2 Mbps and a bare chip rate of 248.47 Gbps, with all extracted secure bits successfully passing the randomness test. Our experimental demonstration of this chip-level SDI-QRNG shows significant advantages in practical applications, paving the way for the widespread and cost-effective implementation of room-temperature secure QRNG, which marks a milestone in the field of QRNG chips.

Photonics Research
Jun. 05, 2024, Vol. 12 Issue 7 1379 (2024)
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Topics Lasers and Laser OpticsIntegrated OpticsInstrumentation and MeasurementsImaging Systems, Microscopy, and DisplaysFiber Optics and Optical Communications Special Issues
Optical Microresonators (2023)
Editor (s): Yun-Feng Xiao, Kartik Srinivasan, Pascal Del’Haye, Mengjie Yu
Optical Metasurfaces: Fundamentals and Applications (2022)
Editor (s): Guixin Li, Thomas Pertsch, Shumin Xiao
Next-generation Silicon Photonics (2022)
Editor (s): Daoxin Dai, Di Liang, Pavel Cheben
Deep learning in photonics (2021)
Editor (s): Zongfu Yu, Yang Chai, Li Gao, Darko Zibar
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