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Three-year-old journal ranked among top optics journals in first year of recognition.

The image on the cover for Chinese Optics Letters Volume 20, Issue 5, reports reflective photon nanosieves that consist of metallic meta-mirrors sitting on a transparent quartz substrate. Upon illumination, these meta-mirrors offer the reflectance of &sim;50%, which is higher than the transmission of visible light through diameter-identical nanoholes.The image is based on original research by Samia Osman Hamid Mohammed et al. presented in their paper "Efficiency-enhanced reflective nanosieve holograms", Chinese Optics Letters 20 (5), 053602. (2022)

The image on the cover for Photonics Research Volume 10, Issue 4, reports the demonstration of an N-polar InGaN/GaN nanowire sub-microscale LED emitting in the red spectrum that can overcome the efficiency cliff of conventional red-emitting micro-LEDs. The image is based on original research by A. Pandey et al. presented in their paper "N-polar InGaN/GaN nanowires: overcoming the efficiency cliff of red-emitting micro-LEDs", Photonics Research 10 (4), 04001107 (2022).

The image on the cover for Advanced Photonics Volume 4 Issue 2 illustrates a schematic of a Mueller matrix measurement system and a conceptional Mueller matrix of the sample (4x4 matrix), as well as the related vectorial properties of the light beams.The image is based on original research presented in the article by Chao He, Jintao Chang, Patrick S. Salter, Yuanxing Shen, Ben Dai, Pengcheng Li, Yihan Jin, Samlan Chandran Thodika, Mengmeng Li, Tariq Aziz, Jingyu Wang, Jacopo Antonello, Yang Dong, Ji Qi, Jianyu Lin, Daniel S. Elson, Min Zhang, Honghui He, Hui Ma, and Martin J. Booth, “ Revealing complex optical phenomena through vectorial metrics,” Adv. Photon. 4(2), 026001 (2022), doi 10.1117/1.AP.4.2.026001.

The image on the cover for Chinese Optics Letters Volume 20, Issue 4, indicates that an InAs/GaAs quantum dot photonic crystal bandedge laser, which is directly grown on an on-axis Si (001) substrate, which provides a feasible route towards a low-cost and large-scale integration method for light sources on the Si platform was achieved under the pumping condition of a continuous-wave 632.8 nm He&ndash;Ne gas laser at room temperature.The image is based on original research by Yaoran Huang et al. presented in their paper "Highly integrated photonic crystal bandedge lasers monolithically grown on Si substrates", Chinese Optics Letters 20 (4), 041401 (2022).

Community-Publication
On 1 August, the Korea Institute of Fusion Energy (KFE) announced that a new fusion simulation code was developed to project and analyze the TAE. In TAE, instabilities occur in the course of interactions between fast ions and the perturbed magnetic fields surrounding them. It disturbs a tokamak's plasma confinement by disengaging fast ions from the plasma core.
High Power Laser Science and Engineering
• Aug. 04, 2022
• Vol. , Issue (2022)
Community-News
US scientists evaluate their options after failing to replicate record-setting experiment from 2021.
High Power Laser Science and Engineering
• Aug. 03, 2022
• Vol. , Issue (2022)
Community-News
The XFEL Physical Sciences Hub is now welcoming proposals for a third cohort of PhD studentships.The deadline for proposals is 14th September 2022.
High Power Laser Science and Engineering
• Jul. 28, 2022
• Vol. , Issue (2022)
News
The article entitled "Reflecting petawatt lasers off relativistic plasma mirrors: a realistic path to the Schwinger limit" was selected as the 2021 High Power Laser Science and Engineering Editor-in-Chief Choice Award paper.
High Power Laser Science and Engineering
• Jul. 28, 2022
• Vol. , Issue (2022)
News
"The design of tunable metamaterials is extremely important for many applications. Integration of micro-electro-mechanical system (MEMS) with metamaterials is very promising direction to achieve reconfigurable capabilities. In this paper, the authors propose and demonstrate with high-quality sophisticated fabrication a reconfigurable and programmable MEMS-based metadevice with multifunctional characteristics to simultaneously perform the logic operations. This study makes an important contribution to the future developments of smart and tunable metadevices." Deputy Editor Prof. Yuri Kivshar comments.
Photonics Research
• Jul. 28, 2022
• Vol. , Issue (2022)
Layer-dependent photoexcited carrier dynamics of WS2 observed using single pulse pump probe method

Understanding the ultrafast carrier dynamics and the mechanism of two-dimensional (2D) transition metal dichalcogenides (TMDs) is key to their application

Understanding the ultrafast carrier dynamics and the mechanism of two-dimensional (2D) transition metal dichalcogenides (TMDs) is key to their applications in the field of optoelectronic devices. In this work, a single pulse pump probe method is introduced to detect the layer-dependent ultrafast carrier dynamics of monolayer and few-layer $WS2$ excited by a femtosecond pulse. Results show that the ultrafast carrier dynamics of the layered $WS2$ films can be divided into three stages: the fast photoexcitation phase with the characteristic time of 2–4 ps, the fast decay phase with the characteristic time of 4–20 ps, and the slow decay phase lasting several hundred picoseconds. Moreover, the layer dependency of the characteristic time of each stage has been observed, and the corresponding mechanism of free carrier dynamics has been discussed. It has been observed as well that the monolayer $WS2$ exhibits a unique rising time of carriers after photoexcitation. The proposed method can be expected to be an effective approach for studying the dynamics of the photoexcited carriers in 2D TMDs. Our results provide a comprehensive understanding of the photoexcited carrier dynamics of layered $WS2$, which is essential for its application in optoelectronics and photovoltaic devices.show less

• Aug.08，2022
• Chinese Optics Letters,Vol. 20, Issue 10
• 100002 (2022)
Deep learning spatial phase unwrapping: a comparative review

Phase unwrapping is an indispensable step for many optical imaging and metrology techniques. The rapid development of deep learning has brought ideas to p

Phase unwrapping is an indispensable step for many optical imaging and metrology techniques. The rapid development of deep learning has brought ideas to phase unwrapping. In the past four years, various phase dataset generation methods and deep-learning-involved spatial phase unwrapping methods have emerged quickly. However, these methods were proposed and analyzed individually, using different strategies, neural networks, and datasets, and applied to different scenarios. It is thus necessary to do a detailed comparison of these deep-learning-involved methods and the traditional methods in the same context. We first divide the phase dataset generation methods into random matrix enlargement, Gauss matrix superposition, and Zernike polynomials superposition, and then divide the deep-learning-involved phase unwrapping methods into deep-learning-performed regression, deep-learning-performed wrap count, and deep-learning-assisted denoising. For the phase dataset generation methods, the richness of the datasets and the generalization capabilities of the trained networks are compared in detail. In addition, the deep-learning-involved methods are analyzed and compared with the traditional methods in ideal, noisy, discontinuous, and aliasing cases. Finally, we give suggestions on the best methods for different situations and propose the potential development direction for the dataset generation method, neural network structure, generalization ability enhancement, and neural network training strategy for the deep-learning-involved spatial phase unwrapping methods.show less

• Aug.08，2022
• Advanced Photonics Nexus,Vol. 1, Issue 1
• 014001 (2022)
Microcavity exciton polaritons at room temperature

The quest for realizing novel fundamental physical effects and practical applications in ambient conditions has led to tremendous interest in microcavity

The quest for realizing novel fundamental physical effects and practical applications in ambient conditions has led to tremendous interest in microcavity exciton polaritons working in the strong coupling regime at room temperature. In the past few decades, a wide range of novel semiconductor systems supporting robust exciton polaritons have emerged, which has led to the realization of various fascinating phenomena and practical applications. This paper aims to review recent theoretical and experimental developments of exciton polaritons operating at room temperature, and includes a comprehensive theoretical background, descriptions of intriguing phenomena observed in various physical systems, as well as accounts of optoelectronic applications. Specifically, an in-depth review of physical systems achieving room temperature exciton polaritons will be presented, including the early development of ZnO and GaN microcavities and other emerging systems such as organics, halide perovskite semiconductors, carbon nanotubes, and transition metal dichalcogenides. Finally, a perspective of outlooking future developments will be elaborated.show less

• Aug.08，2022
• Photonics Insights,Vol. 1, Issue 1
• R04 (2022)
Classical and generalized geometric phase in electromagnetic metasurfaces

The geometric phase concept has profound implications in many branches of physics, from condensed matter physics to quantum systems. Although geometric ph

The geometric phase concept has profound implications in many branches of physics, from condensed matter physics to quantum systems. Although geometric phase has a long research history, novel theories, devices, and applications are constantly emerging with developments going down to the subwavelength scale. Specifically, as one of the main approaches to implement gradient phase modulation along a thin interface, geometric phase metasurfaces composed of spatially rotated subwavelength artificial structures have been utilized to construct various thin and planar meta-devices. In this paper, we first give a simple overview of the development of geometric phase in optics. Then, we focus on recent advances in continuously shaped geometric phase metasurfaces, geometric–dynamic composite phase metasurfaces, and nonlinear and high-order linear Pancharatnam–Berry phase metasurfaces. Finally, conclusions and outlooks for future developments are presented.show less

• Aug.08，2022
• Photonics Insights,Vol. 1, Issue 1
• R03 (2022)

In this study, an optical fiber based magnetic-tuned graphene mechanical resonator are demonstrated by integrating superparamagnetic iron oxide nanoparticles on the graphene membrane. T

In this study, an optical fiber based magnetic-tuned graphene mechanical resonator are demonstrated by integrating superparamagnetic iron oxide nanoparticles on the graphene membrane. The resonance frequency shift is achieved by tuning the tension of the graphene membrane with a magnetic field. A resonance-frequency tunability of 23 kHz using a 100-mT magnetic field is achieved. The device provides a new way to tune a GMR with a non-contact force. It could also be used for weak-magnetic field detection in the future with further improvements in sensitivity.show less

• Aug.08，2022
• Chinese Optics Letters,Vol. 21, Issue 1
• (2023)

Noninterferometric X-ray quantitative phase imaging (XQPI) methods have provided a much simpler than interferometric scheme, high-resolution, and reliable phase-contrast image. We repor

Noninterferometric X-ray quantitative phase imaging (XQPI) methods have provided a much simpler than interferometric scheme, high-resolution, and reliable phase-contrast image. We report on implementing the volumetric XQPI images using concurrent-bidirectional scanning of the orthogonal plane on the optical axis of the Foucault differential filter; we then extracted data in conjunction with the transport-intensity equation. The volumetric image of the laminate microstructure of the gills of a fish was successfully reconstructed to demonstrate our XQPI method. The method can perform 3D rendering without any rotational motion for laterally extended objects by manipulating incoherent X-rays using the pinhole array. show less

• Aug.08，2022
• Chinese Optics Letters,Vol. 21, Issue 1
• (2023)

Nitrogen-vacancy (NV) color centers can perform highly sensitive and spatially resolved quantum measurements of physical quantities such as magnetic field, temperature, and pressure. Me

Nitrogen-vacancy (NV) color centers can perform highly sensitive and spatially resolved quantum measurements of physical quantities such as magnetic field, temperature, and pressure. Meanwhile, sensing so many variables at the same time often introduces additional noise, causing a reduced accuracy. Here, a dual microwave time-division multiplexing protocol is used in conjunction with a lock-in amplifier in order to decouple temperature from magnetic field and vice versa. In this protocol, dual-frequency driving and frequency modulation are used to measure magnetic and temperature field simultaneously in real time. The sensitivity of our system is about 3.4nT/√Hz and 1.3mK/√Hz, respectively. Our detection protocol not only enables multifunctional quantum sensing, but also extends more practical applications.show less

• Aug.08，2022
• Chinese Optics Letters,Vol. 21, Issue 1
• (2023)

Studies on the kinetics of gas-phase chemical reactions currently rely on calculations or simulations and lack simple, fast, and accurate direct measurement methods. We developed a tuna

Studies on the kinetics of gas-phase chemical reactions currently rely on calculations or simulations and lack simple, fast, and accurate direct measurement methods. We developed a tunable laser molecular absorption spectroscopy (TLAS) measurement system to achieve direct measurements of such reactions by using wavelength modulated spectroscopy, and have performed direct online measurements and diagnostics of molecular concentration, the heat of reaction, and pressure changes during the redox reaction of ozone with nitrogen oxides with a time resolution of 0.1 s. This study provides a promising diagnostic tool for the study of gas-phase chemical reaction kinetics. show less

• Aug.08，2022
• Chinese Optics Letters,Vol. 21, Issue 1
• (2023)
Hangzhou, China25~27 November
Xi'an, ChinaAug 7-10, 2022
Three-year-old journal ranked among top optics journals in first year of recognition.
• Journal
• 1th Jul，2022
The image on the cover for Chinese Optics Letters Volume 20, Issue 5, reports reflective photon nanosieves that consist of metallic meta-mirrors sitting on a transparent quartz substrate. Upon illumination, these meta-mirrors offer the reflectance of &sim;50%, which is higher than the transmission of visible light through diameter-identical nanoholes.The image is based on original research by Samia Osman Hamid Mohammed et al. presented in their paper "Efficiency-enhanced reflective nanosieve holograms", Chinese Optics Letters 20 (5), 053602. (2022)
• Journal
• 27th May，2022