Advanced Photonics 5th Anniversary Forum
On the Cover: A comparison of cross-correlation based and phase-correlation based image registration algorithms for optical coherence tomographic angiography
On the Cover: On-chip source-device-independent quantum random number generator
On the Cover: Grating-free autofocus for single-pixel microscopic imaging
On the Cover:  Silicon photonic spectrometer with multiple customized wavelength bands

Large field of view is highly demanded for disease diagnosis in clinical applications of optical coherence tomography (OCT) and OCT angiography (OCTA) imaging. Due to the limits on optical scanning range, scanning speed, or data processing speed, only a relatively small region could be acquired and processed for most of current clinical OCT systems at one time, and generate a mosaic image of multiple adjacent small-region images with registration algorithms for disease analysis. In this work, we propose a dual-cross-correlation based translation and rotation registration (DCCTRR) algorithm for wild range OCTA imaging, which performs cross-correlation in both polarcoordinate images and Cartesian-coordinate images to calculate rotation and translation difference respectively. The performance of the proposed method is compared to standard Fourier-Merlin-transform algorithm and the results quantitatively demonstrate that the proposed method is able to align OCTA images with a lower overlap-rate, which could improve the scanning efficiency of large-scale imaging in clinical applications

Device-Independence is the ultimate goal of the realistic security of quantum information, but violating Bells inequality is difficult and complex. We have implemented the first on-chip SDI-QRNG in the whole DI/SDI field, paving the way for large-scale secure utilization of quantum resources at room temperature.

An ultrafast autofocus method for microscopy by Fourier single-pixel imaging via maximizing frequency component magnitude. It is imaging-free and is derived from the physical mechanism, making it highly attractive for autofocusing transparent samples under non-visible illumination.

Silicon photonic spectrometer with multiple customized wavelength-bands incorporated with wideband/narrowband optical filters shows great potential for various applications, including gas monitors, wearable biosensors, portable spectral-domain optical coherence tomography and so on.

Community-Publication
Tracking plasma progression in a picosecond: Physicists develop ultra-fast laser method to study high-density plasmas
Hiroshi Sawada, an associate professor in the Department of Physics at the University of Nevada, Reno, along with his colleagues at several international institutions, has developed a method to track how material heats and cools after a laser pulse has been fired.
High Power Laser Science and Engineering
  • Sep. 25, 2024
  • Vol. , Issue (2024)
Community-News
LLE Research Team Wins 2024 John Dawson Award for Excellence in Plasma Physics Research
The American Physics Society (APS) just awarded a research team from the Laboratory for Laser Energetics (LLE) with the John Dawson Award for Excellence in Plasma Physics Research.
High Power Laser Science and Engineering
  • Sep. 25, 2024
  • Vol. , Issue (2024)
Community-News
Lan Gao wins a DOE $2.75 million early career award to develop innovative diagnostic tools for future fusion energy devices
Princeton Plasma Physics Laboratory (PPPL) research physicist Lan Gao has received a 2024 Early Career Research Program (ECRP) award from the U.S. Department of Energy (DOE) to develop the next generation of diagnostic tools that will provide precise measurements for fusion experiments and future fusion pilot plants.
High Power Laser Science and Engineering
  • Sep. 25, 2024
  • Vol. , Issue (2024)
On the Cover
All-optical nanoscale Thermometry with Silicon Carbide Color Centers
In recent years, there have been significant advancements in nanoscale optical thermometry techniques, particularly in key technological fields such as materials science, biophotonics, and semiconductor engineering. These technologies enable precise temperature detection at the microscopic scale, which is of tremendous value for both scientific res
Photonics Research
  • Sep. 20, 2024
  • Vol. 12, Issue 8 (2024)
Spotlight on Optics
Ultrafast Modulable 2DEG Huygens' Metasurface
As digital information technology, artificial intelligence, and next-generation communication systems continue to advance, there is an increasing demand of dynamically manipulating electromagnetic waves with high speed and efficiency. Metasurface can precisely control the amplitude, phase, polarization and beam direction of incident electromagnetic
Photonics Research
  • Sep. 19, 2024
  • Vol. 12, Issue 5 (2024)
Newest Articles
Electrically tunable optical metasurfaces

Optical metasurfaces have emerged as a groundbreaking technology in photonics, offering unparalleled control over light–matter interactions at the subwave

Optical metasurfaces have emerged as a groundbreaking technology in photonics, offering unparalleled control over light–matter interactions at the subwavelength scale with ultrathin surface nanostructures and thereby giving birth to flat optics. While most reported optical metasurfaces are static, featuring well-defined optical responses determined by their compositions and configurations set during fabrication, dynamic optical metasurfaces with reconfigurable functionalities by applying thermal, electrical, or optical stimuli have become increasingly more in demand and moved to the forefront of research and development. Among various types of dynamically controlled metasurfaces, electrically tunable optical metasurfaces have shown great promise due to their fast response time, low power consumption, and compatibility with existing electronic control systems, offering unique possibilities for dynamic tunability of light–matter interactions via electrical modulation. Here we provide a comprehensive overview of the state-of-the-art design methodologies and technologies explored in this rapidly evolving field. Our work delves into the fundamental principles of electrical modulation, various materials and mechanisms enabling tunability, and representative applications for active light-field manipulation, including optical amplitude and phase modulators, tunable polarization optics and wavelength filters, and dynamic wave-shaping optics, including holograms and displays. The review terminates with our perspectives on the future development of electrically triggered optical metasurfaces.show less

  • Sep.29,2024
  • Photonics Insights,Vol. 3, Issue 3
  • R07 (2024)
Ultrasonic phase extraction method for co-cable identification in coherent optical transmission systems

An ultrasonic phase extraction method is proposed for co-cable identification without modifying transceivers in coherent optical transmission systems. To

An ultrasonic phase extraction method is proposed for co-cable identification without modifying transceivers in coherent optical transmission systems. To extract the ultrasonic phase, we apply an improved residual frequency offset compensation algorithm, an optimized unwrapping algorithm for mitigating phase noise induced by phase ambiguity between digital signal processing (DSP) blocks, and an averaging operation for improving the phase sensitivity. In a 64-GBaud dual-polarization quadrature phase shift keying (DP-QPSK) simulation system, the phase sensitivity of the proposed method reaches 0.03 rad using lasers with 100-kHz linewidth and a 60-kHz ultrasonic source, with only 400 k-points (kpts) stored data. Also verified by an experiment under the same transmission conditions, the sensitivity reaches 0.39 rad, with 3 kpts of data stored and no averaging due to the equipment limitation. The results have shown this method provides a better choice for low-cost and real-time co-cable identification in integrated sensing and communication optical networks.show less

  • Sep.27,2024
  • Chinese Optics Letters,Vol. 22, Issue 10
  • 100601 (2024)
Scalable cyclic transformation of orbital angular momentum modes based on a nonreciprocal Mach–Zehnder interferometer

The orbital angular momentum (OAM) of photons provides a pivotal resource for carrying out high-dimensional classical and quantum information processing d

The orbital angular momentum (OAM) of photons provides a pivotal resource for carrying out high-dimensional classical and quantum information processing due to its unique discrete high-dimensional nature. The cyclic transformation of a set of orthogonal OAM modes is an essential building block for universal high-dimensional information processing. Its realization in the quantum domain is the universal quantum Pauli-X gate. In this work, we experimentally demonstrate a cyclic transformation of six OAM modes with an averaged efficiency higher than 96% by exploiting a nonreciprocal Mach–Zehnder interferometer. Our system is simple and can, in principle, be scaled to more modes. By improving phase stabilization and inputting quantum photonic states, this method can perform universal single-photon quantum Pauli-X gate, thus paving the way for scalable high-dimensional quantum computation.show less

  • Sep.27,2024
  • Photonics Research,Vol. 12, Issue 10
  • 2249 (2024)
Reconfigurable integrated photonic processor for NP-complete problems

Nondeterministic-polynomial-time (NP)-complete problems are widely involved in various real-life scenarios but are still intractable in being solved effic

Nondeterministic-polynomial-time (NP)-complete problems are widely involved in various real-life scenarios but are still intractable in being solved efficiently on conventional computers. It is of great practical significance to construct versatile computing architectures that solve NP-complete problems with computational advantage. Here, we present a reconfigurable integrated photonic processor to efficiently solve a benchmark NP-complete problem, the subset sum problem. We show that in the case of successive primes, the photonic processor has genuinely surpassed electronic processors launched recently by taking advantage of the high propagation speed and vast parallelism of photons and state-of-the-art integrated photonic technology. Moreover, we are able to program the photonic processor to tackle different problem instances, relying on the tunable integrated modules, variable split junctions, which can be used to build a fully reconfigurable architecture potentially allowing 2N configurations at most. Our experiments confirm the potential of the photonic processor as a versatile and efficient computing platform, suggesting a possible practical route to solving computationally hard problems at a large scale.show less

  • Sep.26,2024
  • Advanced Photonics,Vol. 6, Issue 5
  • 056011 (2024)
Advanced Photonics Photonics Insights

We present the generation of high-repetition-rate strong-field terahertz (THz) pulses from a thin DSTMS organic crystal pumped by a Yb:YAG laser. The generated THz pulse energy reaches 932.8 nJ

We present the generation of high-repetition-rate strong-field terahertz (THz) pulses from a thin DSTMS organic crystal pumped by a Yb:YAG laser. The generated THz pulse energy reaches 932.8 nJ at 1 kHz repetition rate, with a conversion efficiency of 0.19%, and a peak electric field of 819 kV/cm. At a repetition rate of 10 kHz, it is able to maintain a peak electric field of 236 kV/cm and an average THz power of 0.77 mW. The high-repetition-rate, strong-field THz source provides a convenient tool for the study of THz matter manipulation and THz spectroscopy.show less

  • Sep.30,2024
  • High Power Laser Science and Engineering

This manuscript demonstrates a kilo-watt level, spectrum programmable, multi-wavelength fiber laser (MWFL) with wavelength, interval, and intensity tunability. The central wavelength tuning rang

This manuscript demonstrates a kilo-watt level, spectrum programmable, multi-wavelength fiber laser (MWFL) with wavelength, interval, and intensity tunability. The central wavelength tuning range is 1060~1095 nm and the tunable number is controllable from 1 to 5. The wavelength interval can be tuned from 6 to 32 nm and the intensity of each channel can be adjusted independently. Maximum output power up to ~1100 W has been achieved by the MOPA (Master Oscillator Power Amplifier) structures. We also investigate the wavelength evolution experimentally considering the difference of gain competition, which may give a primary reference for kW-level high-power MWFL spectral manipulation. To the best of our knowledge, this is the highest output power ever reported for a programmable MWFL. Benefiting from its high power and flexible spectral manipulability, the proposed MWFL has great potential in versatile applications such as nonlinear frequency conversion, spectroscopy, and so on.show less

  • Sep.30,2024
  • High Power Laser Science and Engineering

We reported a high-power ultra-narrow fiber-coupled diode laser using a Faraday anomalous dispersion optical filter (FADOF) as an external cavity element. An external cavity suitable for both th

We reported a high-power ultra-narrow fiber-coupled diode laser using a Faraday anomalous dispersion optical filter (FADOF) as an external cavity element. An external cavity suitable for both the fiber-coupled package and FADOF configuration has been proposed. Using a 87Rb-based FADOF as the frequency-selective element, we realized a 103 W continuous laser output with a uniform circular beam. The center wavelength was precisely locked at the D2 line of the Rb resonance, and the bandwidth was narrowed from 1.8 nm (free running, FWHM) to 0.013 nm (6.9 GHz, FWHM). The side mode suppression ratio (SMSR) reached 31dB. Such kind of diode lasers with precise wavelength and high spectral brightness have important applications in many fields, such as high-energy gas laser pumping, spin-exchange optical pumping (SEOP), Raman spectroscopy, nonlinear optics, etc.show less

  • Sep.30,2024
  • High Power Laser Science and Engineering

Jiqing Lian(廉吉庆)1,3, Qiaohui Yang(杨巧会)2, Tianyu Liu(刘天宇)2 , Duo Pan(潘多)2* , Jie Miao(苗杰)2 , Zhendong Chen(陈振东)2 , Jingming Chen(陈京明)2 , Jiang Chen(陈江)3 , Lina Bai(白丽娜)1**, Zhidong Liu(刘志栋)3 and

Jiqing Lian(廉吉庆)1,3, Qiaohui Yang(杨巧会)2, Tianyu Liu(刘天宇)2 , Duo Pan(潘多)2* , Jie Miao(苗杰)2 , Zhendong Chen(陈振东)2 , Jingming Chen(陈京明)2 , Jiang Chen(陈江)3 , Lina Bai(白丽娜)1**, Zhidong Liu(刘志栋)3 and Jingbiao Chen(陈景标)1,2,4show less

  • Sep.30,2024
  • Chinese Optics Letters,Vol. 23, Issue 4
  • (2025)