Stimulated Raman Scattering Microscopy and Its Applications
Ao Jianpeng, Huang Jing, and Ji Minbiao
With the development of optical microscopy, people have been able to observe the microcosm on sub-micron scale, which has played a key role in deciphering the code of life activities. Among them, coherent Raman scattering (CRS) microscopy provides imaging contrast based on molecular specific vibration and enhances the spontaneous Raman scattering signal by several orders through a nonlinear optical process, improving the imaging rate and detection sensitivity. According to different nonlinear optical processes, coherent Raman scattering can be divided into coherent anti-Stokes Raman scattering (CARS) and stimulated Raman scattering (SRS). Compared with CARS, SRS has the advantages of no non-resonant background interference, quantitative analysis, etc. This article will introduce the basic principles of coherent Raman scattering, and focus on the development and application of stimulated Raman scattering.
  • Jan. 25, 2022
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 4 0400001 (2022)
  • DOI:10.3788/LOP202259.0400001
Multicore Fibre Gratings Inscription Technology Research Developments
Su Baijin, Zhong Lixi, Xu Ou, and Qin Yuwen
To improve fiber optic communication capacity, multicore fiber, a space division multiplexing implementation option, has attracted increasing research interest. At the same time, various new active and passive optical devices based on multicore fibers are emerging. Multicore fiber grating, which can combine the unique advantages of multicore fiber and fiber grating, offers a wide range of possibilities for the design and application of new all-fiber devices in various fields, such as fiber optic communication, fiber optic sensing, and fiber lasers. In this paper, multi-core optical fiber inscription is classified as selective inscription and full-core inscription. Various multi-core fiber grating inscription schemes based on different light sources and different inscription methods are introduced. The technical characteristics of the different schemes are analysed relative to different application scenarios.
  • Jan. 24, 2022
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 3 0300004 (2022)
  • DOI:10.3788/LOP202259.0300004
Research Progress of Laser Micro-Nano Connection Technology
Zhang Lili, Sun Shufeng, Wang Xi, Zhang Fengyun, Wang Pingping, Cao Chengming, and Zhang Zibin
Laser micro-nano connection connection technology is the basis for mass production of micro-nano structures and electronic components, and is a key technology in the field of micro-nano manufacturing. Based on a brief introduction to the application requirements and main technical methods of micro-nano connection technology, this paper focuses on the analysis and discussion of the micro-nano-scale laser connection technology. Firstly, the dimension range of laser connection technology is introduced, and then three typical laser micro-nano connection technologies are selected according to the different process characteristics, namely laser micro welding technology, micro-nano-scale laser soldering technology and laser soldering bumping technology, the research on the processing principles and characteristics, process parameters and application status of the three technology are reviewed, respectively. Through the summary of the research and application status of laser micro-nano connection technology, this paper discusses the important role of laser micro-nano connection technology in the field of aerospace, microelectronic packaging, medical device,etc., and summarizes the development direction and future research work of laser micro-nano connection technology.
  • Jan. 24, 2022
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 3 0300003 (2022)
  • DOI:10.3788/LOP202259.0300003
Through-Hole Anodized Aluminum Oxide Template Assisted Fabrication of Patterned Nanostructures and Their Applications in Optoelectronic Devices
Shen Jielian, Ji Ting, Li Guohui, Shi Linlin, Feng Lin, Wang Wenyan, Li Dongdong, and Cui Yanxia
The self-assembly template method is a low-cost method suitable for making large-area nanostructures. Compared with the polystyrene microsphere template, the through-hole anodized aluminum oxide (AAO) template has the advantages of adjustable parameters, good insulation and stability, and is widely used in the preparation of many large-area patterned nanostructures which can be used to improve the performances of optoelectronic devices. In this paper, the preparation methods of AAO template are introduced firstly. Then the methods of preparing patterned nanostructures such as nanoparticles, nanowires/rods, nanotubes by AAO template are summarized. Next, the applications of the patterned nanostructures in optoelectronic devices such as solar cells, photodetectors and light-emitting diodes are introduced. Finally, the full text is summarized and the development of through-hole AAO template assisted patterning nanostructures are prospected.
  • Jan. 24, 2022
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 3 0300001 (2022)
  • DOI:10.3788/LOP202259.0300001
Twist-angle two-dimensional superlattices and their application in (opto)electronics
Twist-angle two-dimensional systems, such as twisted bilayer graphene, twisted bilayer transition metal dichalcogenides, twisted bilayer phosphorene and their multilayer van der Waals heterostructures, exhibit novel and tunable properties due to the formation of Moiré superlattice and modulated Moiré bands. The review presents a brief venation on the development of “twistronics” and subsequent applications based on band engineering by twisting. Theoretical predictions followed by experimental realization of magic-angle bilayer graphene ignited the flame of investigation on the new freedom degree, twist-angle, to adjust (opto)electrical behaviors. Then, the merging of Dirac cones and the presence of flat bands gave rise to enhanced light-matter interaction and gate-dependent electrical phases, respectively, leading to applications in photodetectors and superconductor electronic devices. At the same time, the increasing amount of theoretical simulation on extended twisted 2D materials like TMDs and BPs called for further experimental verification. Finally, recently discovered properties in twisted bilayer h-BN evidenced h-BN could be an ideal candidate for dielectric and ferroelectric devices. Hence, both the predictions and confirmed properties imply twist-angle two-dimensional superlattice is a group of promising candidates for next-generation (opto)electronics.
  • Jan. 17, 2022
  • Journal of Semiconductors
  • Vol.43 Issue, 1 011001 (2022)
  • DOI:10.1088/1674-4926/43/1/011001
White-light emission from organic aggregates: a review
Jianyu Zhang, Xueqian Zhao, Hanchen Shen, Jacky W. Y. Lam, Haoke Zhang, and Ben Zhong Tang
White light, which contains polychromic visible components, affects the rhythm of organisms and has the potential for advanced applications of lighting, display, and communication. Compared with traditional incandescent bulbs and inorganic diodes, pure organic materials are superior in terms of better compatibility, flexibility, structural diversity, and environmental friendliness. In the past few years, polychromic emission has been obtained based on organic aggregates, which provides a platform to achieve white-light emission. Several white-light emitters are sporadically reported, but the underlying mechanistic picture is still not fully established. Based on these considerations, we will focus on the single-component and multicomponent strategies to achieve efficient white-light emission from pure organic aggregates. Thereinto, single-component strategy is introduced from four parts: dual fluorescence, fluorescence and phosphorescence, dual phosphorescence with anti-Kasha’s behavior, and clusteroluminescence. Meanwhile, doping, supramolecular assembly, and cocrystallization are summarized as strategies for multicomponent systems. Beyond the construction strategies of white-light emitters, their advanced representative applications, such as organic light-emitting diodes, white luminescent dyes, circularly polarized luminescence, and encryption, are also prospected. It is expected that this review will draw a comprehensive picture of white-light emission from organic aggregates as well as their emerging applications.
  • Jan. 04, 2022
  • Advanced Photonics
  • Vol.4 Issue, 1 014001 (2022)
  • DOI:10.1117/1.AP.4.1.014001
Reconstruction Algorithms for Ghost Imaging and Single-Pixel Imaging
Sun Mingjie, Yan Songming, and Wang Siyuan
Ghost imaging and single-pixel imaging originate from different physical concepts. They have been closely integrated and developed together due to many similarities they share in the system schemes and image reconstruction algorithms. As typical computational imaging technologies, these two imaging schemes have received extensive attention in the fields of optics, imaging, and information acquisition. Different from traditional area array imaging, ghost imaging and single-pixel imaging obtain images by using the reconstruction algorithms, which is one important feature of computational imaging. In this paper, the history of ghost imaging and single-pixel imaging is briefly reviewed with a focus on typical image reconstruction algorithms. The principles of ghost imaging and single-pixel imaging using light field second-order correlation, sampling theory, compressed sensing, and machine learning are explained. Their application potential and prospects are discussed.
  • Dec. 29, 2021
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 2 0200001 (2022)
  • DOI:10.3788/LOP202259.0200001
Theory and Application of Edge States in Topological Photonic Crystals
Liu Chao, Guo Xiaowei, Li Shaorong, and Gao Yuan
In recent years, topological photonic crystals have attracted growing interest for their unique propagation characteristics. With the development of theoretical models in topological photonics, numerous novel applications have emerged. Topological edge states formed by topological photonic crystals can realize optical enhancement and unidirectional transmission in optoelectronic devices. Such optoelectronic devices can have distinct characteristics such as immunity to local defects and high transmission efficiency, offering enormous potential benefits to chip development, biosensor, military communication, and other applications. This study summarizes and analyzes a range of optical devices based on theoretical models of edge states formed by topological photonics in different dimensions: topological lasers, optical waveguides, unidirectional conduction devices, and optical modulators. The presented examples demonstrate the huge potential of topological photonic crystals in structural design and material selection. Finally, the current research progress of topological photonic crystals is clarified and the defects and optimization direction of topological photonic devices in the design process are evaluated and prospected.
  • Dec. 23, 2021
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 1 0100001 (2022)
  • DOI:10.3788/LOP202259.0100001
Experimental Research Progress in Squeezed Light of Continuous Variable Higher-Order Mode
Ma Long, Yan Manjun, Guo Changyuan, and Fan Hongjin
Continuous variable squeezed light plays an important role in quantum information processing, and the most effective generation tool known is the optical parametric oscillator. At present, most research focus on the fundamental mode, however, the intensity and phase distribution of higher-order mode are more complicated. In addition, based on the characteristics of different order modes and their orthogonal characteristics, high-order mode squeezed light brings more choices and applications for quantum communication and quantum precision measurement. This review introduces the experimental research progress of the continuous variable higher-order mode squeezed light based on the optical parametric oscillator, and expounds two common methods for generating high-order mode squeezed light field, including operation in high-order mode OPO and fundamental mode squeezed light combined mode shaping device.
  • Dec. 23, 2021
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 1 0100005 (2022)
  • DOI:10.3788/LOP202259.0100005
Application of Thulium-Doped Laser in the Biomedicine Field
Zhang Anjun, Duan Jialin, Xing Yingbin, and Li Jinyan
Thulium-doped lasers are an ideal choice for biological tissue ablation and lithotripsy applications due to the advantage of efficient absorption by water molecules. They have great application prospects in the field of biomedicine. This paper briefly describes the principle of thulium-doped lasers and biological action, introduces the latest research results for thulium-doped lasers at home and abroad and their application in tissue ablation and lithotripsy surgery, and summarizes different laser parameters, including working mode and power. The effects of the irradiation time, spot area, and pulse frequency, among others, on tissue ablation and lithotripsy surgery reveal that the thulium-doped fiber lasers are an important development direction for medical lasers in the future. In addition, suggestions are made for the development of domestic thulium-doped lasers in the biomedical field.
  • Dec. 23, 2021
  • Laser & Optoelectronics Progress
  • Vol.59 Issue, 1 0100004 (2022)
  • DOI:10.3788/LOP202259.0100004