Article
Engineering, Electrical & Electronic
A. N. Denisov, S. L. Semjonov
Summary: Theoretical study on all-glass microstructured optical fibers (MOFs) with varying diameters and distances of circular fluorine-doped silica glass elements revealed potential for single-mode operation with low leakage losses at specific wavelengths. Numerical analysis using the finite element method indicated the possibility of achieving desired optical properties in the studied MOF design.
QUANTUM ELECTRONICS
(2021)
Article
Optics
Kexiong Sun, Shicheng Zhu, Li Li, Chang Hu, Xiuquan Ma
Summary: This paper presents numerical studies on twisted polygon-shaped core fibers for achieving single mode operation with a large mode area propagation. Twisting-induced high losses to higher order modes and coupling higher order modes with leaky modes are effective for achieving single mode operation in large mode area fibers.
Article
Optics
Alexander Denisov, Vladislav Dvoyrin, Alexey Kosolapov, Mikhail Likhachev, Vladimir Velmiskin, Sergey Zhuravlev, Sergey Semjonov
Summary: The paper presents the results of theoretical and experimental studies on all-glass leakage channel microstructured optical fibers (MOFs) with large mode area and low bending losses. Numerical analysis and simulation were used to study the properties of these fibers, which showed that they allowed for single-mode guidance in a specific spectral range with a small bending radius. Experimental results demonstrated that the fabricated MOFs achieved low losses in a wide spectral range. It is concluded that segments of these MOFs longer than 5 m are single-mode.
Article
Physics, Applied
Rasmus E. Jacobsen, Samel Arslanagic
Summary: In this work, we present an experimental demonstration of a supercavity mode in an all-metallic resonator open for probing by free-space microwaves. By careful tailoring of the boundaries around the resonator, we were able to significantly increase the quality factor, making it suitable for energy harvesting, sensing, and advanced functional material designs.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Hukam Singh, Dinesh Kumar Sharma, Saurabh Mani Tripathi
Summary: By selectively and controllably collapsing air-holes in SC-HMOF, MF-adaptation can be achieved, leading to reduced loss with SMF.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Xin Wang, Chao He, Zengshen Yue, Xue Li, Runpei Yu, Haibo Ji, Zhenyu Zhao, Qiancheng Zhang, Tian Jian Lu
Summary: This study systematically investigates the effect of polyurea coating on the shock resistance of fully-clamped metallic corrugated core sandwich panels against high-velocity aluminum foam projectile impact. The results show that the presence of polyurea coating helps reduce permanent deflection and prevent shear failure. The benefits of polyurea coating in mitigating impact deformation remain stable regardless of the projectile momentum, and thicker, larger, and impact-side coating is preferred. The improved performance is mainly attributed to enhanced plastic bending moment and membrane force in the polyurea-coated sandwich panel.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Optics
Tong Chen, Hao Zhang, Miaoling Yang, Yuan Yao, Wei Lin, Shaoxiang Duan, Bo Liu
Summary: In this paper, a dual-core eccentric-hole fiber (DCEHF) microresonator is proposed for achieving single-longitudinal mode (SLM) laser emission. The enhanced pump light field induced by scattering effect of the two fiber cores is utilized in the microresonator. The experimental results show that the proposed microresonator supports highly stable SLM laser emission and possesses several desirable merits.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Zhixiang Yang, Yifei Zhao, Yifan Zhang, Guiyao Zhou
Summary: This paper presents a novel 7-core 5-mode fiber that has a large mode area and low inter-core crosstalk. By utilizing an air-trench structure and high-index ring, the proposed fiber achieves large mode area and low crosstalk. Numerical analyses demonstrate that the fiber can reliably transmit 5 LP modes in the C+L band, with an effective mode area of each LP mode larger than 110 square micrometers and a crosstalk smaller than -79 dB/km. Each mode has an effective refractive index difference larger than 1.1 x 10-3. Therefore, even when the mode area is large, a low crosstalk can still be achieved. The proposed fiber can be used to construct a high-capacity fiber optic transmission system.
Article
Optics
Song Yang, Wentao Zhang, Yulai She, Hao Du, San Tu
Summary: In this paper, a novel fiber with a parabolic-profile core and segmented trenches in cladding is designed, which offers good bending resistance and is suitable for high-power lasers.
Article
Chemistry, Physical
Kevin K. Ly, David M. Ceperley
Summary: This work proposes a simple scheme to perform phonon calculations with quantum Monte Carlo (QMC) methods and applies it to metallic hydrogen. The conventional method of calculating force constants in metallic hydrogen is computationally expensive due to its energy and length scales, as well as statistical noise inherent in QMC methods. The authors demonstrate an alternate approach that is nearly 100 times more efficient in resolving the force constants required for calculating the phonon spectrum in the harmonic approximation, requiring only the calculation of atomic forces without significant programmatic modification.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
A. N. Denisov, S. L. Semjonov
Summary: A new design of microstructured optical fibers (MOFs) with different separations between rings has been proposed and analyzed numerically using the finite element method (FEM). The study has shown the presence of several local maxima in the spectral dependence of leakage loss for higher order modes and demonstrated single-mode operation in a specific wavelength range.
QUANTUM ELECTRONICS
(2021)
Article
Mechanics
A. N. Denisov, S. L. Semjonov
Summary: A new design of all-glass microstructured fibers with large mode area was proposed and analyzed using the finite element method. The simulation results showed that the proposed design allows single-mode guidance in the spectral range of 0.87 to 1.11 microns for straight and bent fibers, demonstrating its effectiveness.
Article
Engineering, Electrical & Electronic
Qianqian Peng, Junkai Sheng, Keyu Yang, Xiange Wang, Weilu Sun, Yuze Wang, Xiaolin Liang, Kai Jiao, Shengchuang Bai, Zheming Zhao, Zijun Liu, Peiqing Zhang, Rongping Wang, Qiuhua Nie, Xunsi Wang
Summary: The small core size in conventional single-mode step-indexed chalcogenide fiber limits the power density for mid-infrared (mid-IR) laser power delivery. Increasing the mode area with a large core size is a solution, but it may affect the beam quality. In this study, a novel mid-IR segmented cladding fiber (SCF) with a leakage structure based on chalcogenide glasses was proposed to achieve a large mode area and single-mode operation. The SCF showed potential for high-power mid-IR laser transmission, with more than 2000 μm² mode area and more than 300 loss ratio of high order modes (LP11) to the fundamental mode (LP01). The SCF was fabricated for the first time using an extrude-and-stack technique based on chalcogenide glasses, demonstrating a minimum fiber loss of 3.1 dB/m at 8.6 μm and a bend loss of 3 dB at a bend radius of 6 mm. The mode area in SCF can be increased over 15 times compared to traditional step-index single-mode fiber.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Zhiwen Xia, Xin Zhang, Jingyuan Yao, Zihao Liu, Yulong Jin, Huabing Yin, Pu Wang, Xiu-Hong Wang
Summary: Microstructured optical fibers (MOFs) provide solutions for high-power transmission and high-efficiency optical waveguides. Hollow-core anti-resonant optical fibers (HcARFs) significantly enhance Raman scattering and enable the development of an optical fiber sensor for single cancer exosome detection. This opens up possibilities for multiplexed analysis and accurate identification of the cellular origin of exosomes for cancer diagnosis.
Article
Optics
Shuai Gu, Xin Wang, Haoqiang Jia, Zhenggang Lian, Xiang Shen, Yifan Mai, Shuqin Lou
Summary: A 7-tube single-ring hollow-core anti-resonant fiber (SR-ARF) with a record low transmission loss of 4.3 dB/km @1080 nm is reported. It has a large core diameter and a wide low-loss transmission window, and exhibits excellent beam quality after 10-m-long transmission.
