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.

PR Highlights
Enriched photosensitizer for deep-seated tumors photodynamic therapy
Photodynamic therapy (PDT) is a unique mode of treatment that employs a photosensitizer and light of a specific wavelength to eradicate cancer cells in a non-invasive manner. Upon activation, the photosensitizer generates highly reactive oxygen species (ROS) or other oxidizing agents, leading to cell death. Its history dates back to the early 20th century when scientists discovered that certain dyes could kill microbes under light exposure. Initial research focused on photosensitizer selection and light source application. With technological advancements in the 1970s, PDT began its application in cancer therapy. However, current PDT is mainly limited to skin and superficial tissue tumors due to the photosensitizers' sensitivity to visible light, which is absorbed by most biological molecules, limiting light penetration and reducing efficacy against deep-seated tumors. For greater penetration, near-infrared (NIR) light is ideal, given its lower absorption by biological tissues within the NIR window (700-1700 nm), allowing for better penetration and activation of photosensitizers deep within tumors, enhancing PDT's effectiveness.
Photonics Research
  • Jul. 12, 2024
  • Vol. 12, Issue 5 (2024)
AI Highlights
Snapshot macroscopic Fourier ptychography: far-field synthetic aperture imaging via illumination multiplexing and camera array acquisition
Fourier Ptychographic Microscopy (FPM) is a computational imaging technique that offers large field-of-view, high-resolution quantitative phase imaging, enabling simultaneous phase retrieval and aperture synthesis. Building on this foundation, Holloway et al. from Rice University extended FPM to the far field by incorporating aperture scanning, achieving synthetic aperture far-field imaging of reflecting objects with rough surfaces and enhancing the resolution by a factor of six.
Advanced Imaging
  • Jul. 11, 2024
  • Vol. 1, Issue 1 (2024)
Community-News
New Density-Functional Theory Code MELIORA Released by LLE’s High-Energy-Density-Physics Theory Group
The density-functional theory (DFT) coding team, led by University of Rochester Department of Mechanical Engineering PhD student John Cappelletti (advised by Prof. Suxing Hu), has created a finite-element-based DFT code called MELIORA. MELIORA will help us answer some key high-energy-density questions related to inertial confinement fusion and the Stockpile Stewardship Program, such as shock release and viscus mixing.
High Power Laser Science and Engineering
  • Jul. 11, 2024
  • Vol. , Issue (2024)
Community-News
Workshop on Micro and Nano-Structured Materials for Experiments with High-Power Lasers
Workshop on Micro and Nano-Structured Materials for Experiments with High-Power Lasers will take place in Lisbon, Portugal on 21 September 2024.
High Power Laser Science and Engineering
  • Jul. 10, 2024
  • Vol. , Issue (2024)
Community-News
Together against lung cancer
Laser-based research into the early detection of lung cancer is receiving a new boost. A high-ranking delegation led by Prof. Zheng You, President of Huazhong University of Science and Technology in Wuhan, has now signed a Memorandum of Understanding with the attoworld team at the Centre for Advanced Laser Applications (CALA).
High Power Laser Science and Engineering
  • Jul. 10, 2024
  • Vol. , Issue (2024)
Newest Articles
Temperature-insensitive fiber-optic refractive index sensor based on cascaded in-line interferometer and microwave photonics interrogation system

A compact and high-resolution fiber-optic refractive index (RI) sensor based on a microwave photonic filter (MPF) is proposed and experimentally validated

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-thin-core fiber (TCF)-SMF. The surrounding RI (SRI) can be demodulated by tracing the passband’s central frequency of the MPF, which is constructed by the cascaded in-line interferometer, electro-optic 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 30 mm length of TCF, the sensor achieves a maximum theoretical sensitivity and resolution of -1.403 GHz / refractive index unit (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 ° C - 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, low cost, high resolution, and temperature insensitivity.show less

  • Jul.13,2024
  • Advanced Photonics Nexus,Vol. 3, Issue 4
  • 046011 (2024)
Frequency stabilization of C-band semiconductor lasers through a SiN photonic integrated circuit

Integrated semiconductor lasers represent essential building blocks for integrated optical components and circuits and their stability in frequency is fun

Integrated semiconductor lasers represent essential building blocks for integrated optical components and circuits and their stability in frequency is fundamental for the development of numerous frontier applications and engineering tasks. When dense optical circuits are considered, the stability of integrated laser sources can be impaired by the thermal cross-talk generated by the action of neighboring components, leading to a deterioration of the long-term system performance (on the scale of seconds). In this work we show the design and the experimental characterization of a silicon nitride photonic integrated circuit (PIC) that is able to frequency stabilize 16 semiconductor lasers, simultaneously. A stabilized 50 GHz-spaced two-channel system is demonstrated through the detection of the related beating note and the stability of the resulting waveform is characterized via the use of artificially induced thermal cross-talk stimuli.show less

  • Jul.13,2024
  • Photonics Research,Vol. 12, Issue 8
  • 1619 (2024)
Gd3Al3Ga2O12:Ce3+, Yb3+ fluorescent ceramic with highly increased trap density for optical information storage

Electron-trapping materials, due to their exceptional ability of energy storage and controllable photon release under external stimulation, have attracted

Electron-trapping materials, due to their exceptional ability of energy storage and controllable photon release under external stimulation, have attracted considerable attention in the field of optical information storage (OIS). In this work, Gd3Al3Ga2O12:Ce3+, Yb3+ fluorescent ceramics, were developed using air and vacuum sintering technology. By co-doping Ce3+ and Yb3+, the trap density was significantly increased by 7.5 times compared to samples containing only Ce3+. Vacuum annealing further enhanced trap density by 1.6 times compared to samples sintered solely in air, while generating deep traps (1.44 eV), making Gd3Al3Ga2O12:Ce3+, Yb3+ an excellent OIS medium. This work is expected to facilitate the development of OIS materials.show less

  • Jul.13,2024
  • Chinese Optics Letters,Vol. 22, Issue 7
  • 071601 (2024)
Observing the collapse of super-Bloch oscillations in strong-driving photonic temporal lattices

Super-Bloch oscillations (SBOs) are amplified versions of direct current (dc)-driving Bloch oscillations realized under the detuned dc- and alternating cu

Super-Bloch oscillations (SBOs) are amplified versions of direct current (dc)-driving Bloch oscillations realized under the detuned dc- and alternating current (ac)-driving electric fields. A unique feature of SBOs is the coherent oscillation inhibition via the ac-driving renormalization effect, which is dubbed as the collapse of SBOs. However, previous experimental studies on SBOs have only been limited to the weak ac-driving regime, and the collapse of SBOs has not been observed. Here, by harnessing a synthetic temporal lattice in fiber-loop systems, we push the ac-field into a strong-driving regime and observe the collapse of SBOs, which manifests as the oscillation-trajectory localization at specific ac-driving amplitudes and oscillation-direction flip by crossing collapse points. By adopting arbitrary-wave ac-driving fields, we also realize generalized SBOs with engineered collapse conditions. Finally, we exploit the oscillation-direction flip features to design tunable temporal beam routers and splitters. We initiate and demonstrate the collapse of SBOs, which may feature applications in coherent wave localization control for optical communications and signal processing.show less

  • Jul.13,2024
  • Advanced Photonics,Vol. 6, Issue 4
  • 046001 (2024)
Advanced Photonics Photonics Insights

Ultra-stable continuous wave lasers are one of the important elements for space-based gravitational wave detection. Here we present a Pound-Drever-Hall laser frequency locking system based on a

Ultra-stable continuous wave lasers are one of the important elements for space-based gravitational wave detection. Here we present a Pound-Drever-Hall laser frequency locking system based on a field-programmable gate array, demonstrating its potential to achieve 10-16 levels of frequency stability for space applications. The system is employed to lock a space-qualified 1064 nm neodymium-doped yttrium aluminum garnet laser to a laboratory-operated 20 cm ultra-stable optical cavity. Major noise contributors are identified as laser intensity fluctuation and residual amplitude modulation. Heterodyne beat measurement shows that the frequency noise spectral density of a single laser is reduced to 2.5 Hz/√Hz at a Fourier frequency of 1 mHz, and the frequency instability is 2.1×10-16 at 1s and remains below 3.5×10-16 up to 6,000 s.show less

  • Jul.13,2024
  • Chinese Optics Letters,Vol. 23, Issue 1
  • (2025)

Computational imaging overcomes traditional optical imaging limitations by incorporating encoding and decoding. It represents a paradigm shift in imaging technology, leveraging the manipulation

Computational imaging overcomes traditional optical imaging limitations by incorporating encoding and decoding. It represents a paradigm shift in imaging technology, leveraging the manipulation and interpretation of the light field to extract richer information than was previously attainable. This review explores the emergence and development history of computational imaging. By analyzing the essence of computational imaging from the perspective of the light field, this review categorizes the entire technological roadmap of the computational imaging field based on the imaging framework. This review serves as a reference for researchers, producers, and policymakers on the main trends, frontiers, and future directions of computational imaging.show less

  • Jul.13,2024
  • Advanced Imaging,Vol. 1, Issue 1

Pathological examination is essential for cancer diagnosis. Frozen sectioning has been the gold standard for intraoperative tissue assessment, which, however, is hampered by its laborious proces

Pathological examination is essential for cancer diagnosis. Frozen sectioning has been the gold standard for intraoperative tissue assessment, which, however, is hampered by its laborious processing steps and often provides inadequate tissue slide quality. To address these limitations, we developed a deep learning-assisted, ultraviolet light-emitting diode (UV-LED) microscope for label-free and slide-free tissue imaging. Using UV-based light-sheet (UV-LS) imaging mode as the learning target, UV-LED images with high contrast are generated by employing a weakly supervised network for contrast enhancement. With our approach, the image acquisition speed for providing contrast-enhanced UV-LED (CE-LED) images is 47 seconds/cm2, ~25 times faster than that of the UV-LS system. The results show that this approach significantly enhances the image quality of UV-LED, revealing essential tissue structures in cancerous samples. The resulting CE-LED offers a low-cost, non-destructive, and high-throughput alternative histological imaging technique for intraoperative cancer detection.show less

  • Jul.13,2024
  • Advanced Imaging,Vol. 1, Issue 2

We consider the image (video) compression on resource limited platforms. An ultra low-cost image encoder, named Block Modulating Video Compression (BMVC) with an extremely low-cost encoder is pr

We consider the image (video) compression on resource limited platforms. An ultra low-cost image encoder, named Block Modulating Video Compression (BMVC) with an extremely low-cost encoder is proposed to be implemented on mobile platforms with low consumption of power and computation resources. Accordingly, we also develop two types of BMVC decoders, implemented by deep neural networks. The first BMVC decoder is based on the Plug-and-Play (PnP) algorithm, which is flexible to different compression ratios. The second decoder is a memory-efficient end-to-end convolutional neural network, which aims for real-time decoding. Extensive results on the high definition images and videos demonstrate the superior performance of the proposed codec and the robustness against bit quantization.show less

  • Jul.13,2024
  • Advanced Imaging,Vol. 1, Issue 2