On the Cover: Flexible 2 × 2 multiple access visible light communication system based on an integrated parallel GaN/InGaN micro-photodetector array module
On the Cover: Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications
On the Cover: Detailed characterization of kHz-rate laser-driven fusion at a thin liquid sheet with a neutron detection suite
On the Cover: Generation of subwavelength inverted pin beam via fiber end integrated plasma structure
On the Cover: High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

A GaN-based visible light array receiver enables high-speed short-wavelength multi-access applications in visible light laser communication networks in the upcoming 6G era.

The con?nement of waves is a long-standing pursuit in both fundamental science and practical applications. Recent exploration of bound states in the continuum (BICs) has introduced novel approaches for e?ectively trapping light waves. With additional degrees of polarization freedom in momentum space, optical BICs are driving innovation in areas such as spin-orbit interactions and light-matter interactions.

The image presents a depiction of laser-driven deuterium fusion, where a high repetition-rate femtosecond pulse laser is focused onto a thin layer of heavy water (deuterium oxide). Upon laser irradiation, two deuterium nuclei within the heavy water undergo fusion to form a pair of relativistic neutron and helium nucleus. The backdrop features artistic representations of deuterated water molecules, emphasizing the use of a submicron sheet of liquid heavy water as the primary material for the target to achieve the fusion process. The visual showcases a dynamic interplay between light and matter, with a colorful and energetic contrast that highlights the fusion reaction taking place.

The image on the cover illustrates an all-?ber subwavelength structured light beam generator based on the ?ber end integrated plasma structure. It can generate a kind of novel subwavelength structured light beam, an inverted pin beam.

Perovskite light-emitting diodes (PeLEDs) are considered promising candidates for future display and lighting technologies due to their excellent optoelectronic properties and simple fabrication methods. The introduction of the zwitterionic molecule 3-(benzyldimethylammonio)propanesulfonate (3-BAS) serves multiple purposes: it passivates defects on the perovskite surface, suppresses the migration of halide ions, and e?ectively regulates the crystallization process of perovskite thin ?lms. The image on the cover illustrates blue LEDs based on perovskites and suggests potential application prospects in future visible light communication.

APN Highlights
Breaking data transmission barriers: Innovations in data center interconnects
Researchers combine nonlinear predistortion and digital resolution enhancement to overcome DAC challenges
Advanced Photonics Nexus
  • Jun. 11, 2024
  • Vol. 3, Issue 3 (2024)
APN Highlights
Toward testing the quantum behavior of gravity: A photonic quantum simulation
Principles behind gravity-mediated entanglement were experimentally demonstrated in a simulation using photons, providing insights into the nature of gravity
Advanced Photonics Nexus
  • Jun. 11, 2024
  • Vol. 3, Issue 3 (2024)
APN Highlights
Sorting complex light beams: A breakthrough in optical physics
New metasurface design enables efficient sorting of vector structured beams, a pivotal step toward the practical application of complex light beams
Advanced Photonics Nexus
  • Jun. 11, 2024
  • Vol. 3, Issue 3 (2024)
On the Cover
Flexible 2 × 2 multiple access visible light communication system based on an integrated parallel GaN/InGaN micro-photodetector array module
Visible light communication is considered as an indispensable part of the future 6G network because of its extremely rich available spectrum resources (400-800THz). It is expected that by 2030, data traffic on communications networks will surge to 5000 EB per month. At the same time, the development of the Internet of Things system also brings an increasing number of access requirements. The multi-access function will bring convenience to inter-satellite, underwater, terrestrial and indoor networks, enabling applications such as multi-access edge computing and underwater UAV networks. However, most of the current visible light transmission experiments are limited to point-to-point transmission scenarios. And in the multiple access experiment, the devices used are not integrated devices. The volume and cost limit the application of this kind of system. Compared with the discrete devices, the integrated receiver array is more conducive to the miniaturization of the system. At the same time, visible light receivers usually use silicon-based detection units, which are generally more suitable for receiving long-wavelength visible and infrared signals. For underwater visible light channel, short wavelength visible light has better transmittivity, so a material that is more sensitive to short wavelength is needed to make a light detector.
Photonics Research
  • Jun. 11, 2024
  • Vol. 12, Issue 4 (2024)
Community-News
Network on Extreme Intensity Laser Systems (NEILS) Meeting 2024
The Network on Extreme Intensity Laser Systems (NEILS) Meeting 2024 is taking place Monday 22nd to Tuesday 23rd July.
High Power Laser Science and Engineering
  • Jun. 06, 2024
  • Vol. , Issue (2024)
Newest Articles
Label-free super-resolution stimulated Raman scattering imaging of biomedical specimens

Far-field super-resolution microscopy has unraveled the molecular machinery of biological systems that tolerate fluorescence labeling. Conversely, stimula

Far-field super-resolution microscopy has unraveled the molecular machinery of biological systems that tolerate fluorescence labeling. Conversely, stimulated Raman scattering (SRS) microscopy provides chemically selective high-speed imaging in a label-free manner by exploiting the intrinsic vibrational properties of specimens. Even though there were various proposals for enabling far-field super-resolution Raman microscopy, the demonstration of a technique compatible with imaging opaque biological specimens has been so far elusive. Here, we demonstrate a single-pixel-based scheme, combined with robust structured illumination, that enables super-resolution in SRS microscopy. The methodology is straightforward to implement and provides label-free super-resolution imaging of thick specimens, therefore paving the way for probing complex biological systems when exogenous labeling is challenging.show less

  • Jun.14,2024
  • Advanced Imaging,Vol. 1, Issue 1
  • 011004 (2024)
Structural coloration: advancements and challenges
  • Jun.14,2024
  • Photonics Insights,Vol. 3, Issue 2
  • C04 (2024)
Object pose and surface material recognition using a single-time-of-flight camera

We propose an approach for recognizing the pose and surface material of diverse objects, leveraging diffuse reflection principles and data fusion. Through

We propose an approach for recognizing the pose and surface material of diverse objects, leveraging diffuse reflection principles and data fusion. Through theoretical analysis and the derivation of factors influencing diffuse reflection on objects, the method concentrates on and exploits surface information. To validate the feasibility of our theoretical research, the depth and active infrared intensity data obtained from a single time-of-flight camera are initially combined. Subsequently, these data undergo processing using feature extraction and lightweight machine-learning techniques. In addition, an optimization method is introduced to enhance the fitting of intensity. The experimental results not only visually showcase the effectiveness of our proposed method in accurately detecting the positions and surface materials of targets with varying sizes and spatial locations but also reveal that the vast majority of the sample data can achieve a recognition accuracy of 94.8% or higher.show less

  • Jun.14,2024
  • Advanced Photonics Nexus,Vol. 3, Issue 5
  • 056001 (2024)
Broadband intelligent programmable metasurface with polarization-modulated self-adaptive electromagnetic functionality switching

Programmable metasurfaces have received a great deal of attention due to their ability to dynamically manipulate electromagnetic (EM) waves. Despite the r

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.show less

  • Jun.14,2024
  • Photonics Research,Vol. 12, Issue 7
  • 1395 (2024)
Advanced Photonics Photonics Insights

Quantum detection technology and quantum imaging based on two-photon interference effects, along with various new conceptual imaging schemes inspired by quantum imaging and developed through flu

Quantum detection technology and quantum imaging based on two-photon interference effects, along with various new conceptual imaging schemes inspired by quantum imaging and developed through fluctuations and correlations in the light field, have significantly redefined the meaning and content of imaging technology. This has rejuvenated the ancient discipline of imaging science, transforming it into a burgeoning field at the intersection of optical coherence and quantum optics, information science, applied mathematics, artificial intelligence, computer vision, light field manipulation, and compressive sensing technologies. These advancements provide practical and innovative technological approaches to greatly enhance the capability and efficiency of image information acquisition in various application scenarios.show less

  • Jun.14,2024
  • Chinese Optics Letters,Vol. 22, Issue 6
  • (2024)

Real-time evaluation of laser-driven byproducts is crucial for state-of-the-art facilities operating at high repetition rates. This work presents real-time measurements of hard X-rays (bremsstra

Real-time evaluation of laser-driven byproducts is crucial for state-of-the-art facilities operating at high repetition rates. This work presents real-time measurements of hard X-rays (bremsstrahlung radiation) generated from the interaction of high-intensity laser pulses with solid targets in the Target Normal Sheath Acceleration regime using a scintillator stack detector. The detector offers insights into the effectiveness of laser-plasma interaction through measured fluctuations in bremsstrahlung radiation temperature and scintillation light yield on a shot-to-shot basis. Moreover, a strong correlation of the bremsstrahlung measurements (i.e. temperature and yield) with the cutoff energy of laser-driven protons was observed. The scintillator stack detector serves not only as a diagnostic for online monitoring of the laser-plasma interaction but also as a promising tool for estimating proton energy fluctuations in a non-disruptive manner, which is particularly important when direct proton source characterization is impractical, e.g. during experiments aimed at irradiating user samples with the accelerated proton beam.show less

  • Jun.14,2024
  • High Power Laser Science and Engineering

A compact and high-resolution fiber-optic refractive index (RI) sensor based on a microwave photonic filter (MPF) is proposed and experimentally validated. The sensing head utilizes a cascaded i

A compact and high-resolution fiber-optic refractive index (RI) sensor based on a microwave photonic filter (MPF) is proposed and experimentally validated. The sensing head utilizes a cascaded in-line interferometer fabricated by an input single-mode fiber (SMF) tapered fusion with no-core fiber (NCF)-thin-core fiber (TCF)-SMF(STNTS). The surrounding refractive index (SRI) can be demodulated by tracing the passbands central frequencyof the MPF, which is constructed by the cascaded in-line interferometer, electro-optics modulator and a section of dispersion compensation fiber. The sensitivity of the sensor is tailorable through the use of different lengths of TCF. Experimental results reveal that with a length of TCF 30 mm, the sensor achieves a maximum theoretical sensitivity (MTS) and resolution of -1.403 GHz/RIU and 1.425 × 10−7 RIU, respectively, which is at least 6.3 times higher than what has been reported previously. Furthermore, the sensor exhibits temperature-insensitive characteristics within the range of 25∼75◦C, with a temperature-induced frequency change of only ±1.5 MHz. This value is significantly lower than the frequency change induced by changes in the SRI. The proposed MPF-based cascaded in-line interferometer RI sensor possesses benefits such as easy manufacture, cost effective, high resolution and temperature insensitive.show less

  • Jun.14,2024
  • Advanced Photonics Nexus

Terahertz radiation finds important applications in various fields, making the study of Terahertz sources significant. Among different approaches, electron accelerator-based THz sources hold not

Terahertz radiation finds important applications in various fields, making the study of Terahertz sources significant. Among different approaches, electron accelerator-based THz sources hold notable advantages in generating THz radiation with narrow-band, high-brightness, high-peak-power, and high-repetition rate. To further improve the THz radiation energy, the bunching factor of the free electron bunch train needs to be increased. In this paper, we propose and numerically reveal that, by adding an additional short-pulse drive beam before the main beam as the excitation source of nonlinear plasma wake, the bunching factor of the main beam can be further increased to ~0.94 even though with a relatively low charge, low current and relatively diffused electron beam. Such two electron beams with loose requirements can be easily generated using typical photoinjectors. Our work provides a way for a new terahertz source with enhanced radiation energy.show less

  • Jun.14,2024
  • Advanced Photonics Nexus