Article
Physics, Multidisciplinary
Arezou Rashidi, Ali Hatef
Summary: In this paper, the nonlinear optical response characteristics of a metallic nanograting with nonlinear Kerr media within its slits were investigated using the finite element method. The results showed a perfect linear absorption at resonance wavelength due to the coupling of the surface plasmon resonance (SPR) mode and photon cavity mode. The transient nonlinear absorption variation of the system was simulated and it was found that the unit linear absorption drastically decreased by increasing the laser fluence around the center of the pulse, while the weak linear off-resonance absorption could be enhanced to the value of unit by increasing the pulse laser fluence. The high laser fluence excites the Kerr nonlinearity, leading to the absorption adjustment in the nanograting and a higher absorption contrast between linear and nonlinear regimes.
Article
Spectroscopy
Maria Merin Antony, C. S. Suchand Sandeep, Vadakke Matham Murukeshan
Summary: Broadband hyperspectral z-scan using a supercontinuum light source is a convenient technique to obtain spectrally resolved nonlinear optical properties of materials. A 3D data model is proposed for representing the data obtained from broadband z-scan measurements, aiding in the quick characterization of spectrally resolved nonlinear optical properties of materials.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Optics
R. Gonzalez-Campuzano, J. Delgado-Aguillon, R. Y. Sato-Berru, A. Sainz-Vidal, A. A. Rodriguez-Rosales, C. J. Roman-Moreno, J. Garduno-Mejia
Summary: In this study, silver nanoparticles colloids with sizes between 10-50 nm were synthesized in deionized water, and their spherical shape was found to evolve into disk and decahedral shapes. By irradiating the samples with a cool-white light-emitting diode source for several hours, the position of the surface plasmon resonance could be controlled from 408 nm to 495 nm. The nonlinear optical properties of the silver nanoparticles colloids were investigated using the Z-scan technique and femtosecond laser pulses @ 800 nm. It was observed that the nonlinear absorption exhibited a saturable absorption effect, while the nonlinear refraction index showed a negative lens-like behavior in all samples, indicating self-defocusing.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Aleksey Starobor, Ivan I. Kuznetsov, Oleg Palashov, Aleksey E. Pestov, Nikolay Chkhalo
Summary: A Faraday isolator using composite terbium gallium garnet TGG/sapphire magneto-optical elements produced by the surface-activated direct bonding method was created. The composite elements showed successful operation at high radiation power, providing an isolation ratio exceeding the classical single TGG element, reaching 34 dB at a laser power of 700 W. The maximum operating power with an isolation ratio higher than 30 dB was estimated to be over 2 kW, almost 3 times more than a single TGG element.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2021)
Article
Optics
Adrian Aupart-Acosta, Martha Rosete-Aguilar, Jesus Garduno-Mejia, Oscar G. Rodriguez-Herrera, Camilo Ruiz
Summary: When a low-power, monochromatic Gaussian beam is focused by a thin lens in air, a shift in the focus position occurs if the beam waist is much smaller than the lens size. For ultra-intense light beams with unavoidable Kerr effect, a nonlinear focal shift occurs. The nonlinear focus position moves closer to the lens for laser powers below the critical power.
Article
Engineering, Electrical & Electronic
Meng Huang, Weiguang You, Yanyu Wu, Lei Zhang, Yiran Li, Chunjia Gao, Bo Qi
Summary: In this article, a pulsed electric-acoustic (PEA) - Kerr combined measurement method is proposed to measure the distribution of space charge and electric field of oil-paper composite insulation. The PEA-Kerr combined measurement system is built by integrating and optimizing the system structure and signal processing methods of PEA and Kerr measurement. The test results show good linearity and accuracy of the system.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Ophthalmology
Nuria Garzon, Francisco Poyales, Maria Garcia-Montero, Fidel Vega, Maria Sagrario Millan, Cesar Albarran-Diego
Summary: This study compared the outcomes of subjective and objective refractions using different instruments in eyes implanted with different types of IOLs. The results showed significant differences between objective and subjective refraction measurements, with less variation observed in the POD F-GF group.
CURRENT EYE RESEARCH
(2022)
Article
Physics, Applied
Jingwei Li, Ruixuan Wang, Lutong Cai, Qing Li
Summary: The unique material property of silicon carbide (SiC) and the recent demonstration of low-loss SiC-on-insulator integrated photonics platform have attracted considerable research interests. The Kerr nonlinearity among 4H-SiC wafers from major wafer manufacturers has been investigated and the best Kerr nonlinear refractive index of 4H-SiC wafers is estimated to be approximately 4 times of stoichiometric silicon nitride. Experimental evidence also shows that the Kerr nonlinearity in 4H-SiC wafers can be stronger along the c axis.
PHYSICAL REVIEW APPLIED
(2023)
Article
Polymer Science
Ali Atta, Mostufa M. Abdelhamied, Ahmed M. Abdelreheem, Mohamed R. Berber
Summary: Flexible polymer composite films comprising methyl cellulose (MC), polyaniline (PANI), and silver nanoparticles (AgNPs) were successfully fabricated through a cast preparation method. The inclusion of AgNPs and PANI enhanced the optical properties of the MC polymer, providing a new composite suitable for energy conversion systems, solar cells, biosensors, and nonlinear optical applications. The band gap of MC/PANI/AgNPs decreased compared to the pure MC film, while the carbon cluster number increased with the incorporation of AgNPs.
Article
Materials Science, Characterization & Testing
Fabian Gmeiner, Jin-Yeon Kim, Fangzhou Wang, Laurence J. Jacobs
Summary: This research applies linear and nonlinear ultrasonic techniques to quantify oxidation damage in a carbon/carbon composite material. The study successfully utilizes a dry-contact mediator wedge setup for nonlinear ultrasonic applications and visualizes the oxidation damage through scanning electron microscopy. The results show that systematic oxidation starts after 3 minutes of exposure to high temperature, leading to fiber-matrix debonding, matrix defects, and void growth. Nonlinear ultrasonic measurements exhibit superior sensitivity to early stage oxidation, while wave velocity can detect oxidation voids. The combined use of these two parameters provides useful information on the microstructural evolution of C/C composites subjected to high temperatures.
NDT & E INTERNATIONAL
(2023)
Article
Optics
Yunpeng Gao, Yanbo Pei, Fengfeng Yao, Chunfeng Hou
Summary: The behavior of surface plasmon polaritons (SPPs) generated on a silver nanowire surface by coaxial Gaussian beams in Kerr nonlinear mediums is numerically studied. The introduction of the nonlinear effect enhances the propagation of SPPs. Adjusting the nonlinearity or beam intensity further enables soliton-like propagation of SPPs, which is explained by the nonlinear self-focusing effect counteracting attenuation and transferring more light into SPP modes. This research result may contribute to SPP-based applications requiring enhanced propagation length.
Article
Engineering, Manufacturing
Yongchao Xu, Guangen Zhao, Qianting Wang, Youji Zhan, Bingsan Chen
Summary: In this study, CeO2 coated diamond composite abrasives were successfully synthesized by a modified precipitation approach, which eliminated the use of hazardous chemicals in the polishing of sapphire wafers. The composite abrasives exhibited improved polishing performance, with reduced surface roughness, increased material removal rate, and decreased residual stress. The analysis of polished sapphire surface and wear debris provided insights into the polishing mechanism and interfacial contact behavior of the composite abrasives.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Physical
Hyunjo Jeong, Sungjong Cho, Shuzeng Zhang, Xiongbing Li
Summary: The study presents a method for measuring relative and absolute nonlinear parameters of materials using an air-coupled transducer as a receiver. The diffraction and attenuation corrections are derived from an acoustic model for a two-layer medium, and the nonlinear parameter formula with all corrections is defined. The method allows for absolute measurement of the nonlinear parameter ratio or the nonlinear parameter without calibration of the air-coupled receiver and removes restrictions on the selection of reference samples.
Article
Acoustics
Xianghong Wang, Chenglong He, Huanhuan He, Wei Xie
Summary: This paper simulates and tests the nonlinear ultrasonic testing of composite porosity, investigating the relationship between pore parameters and ultrasonic propagation characteristics. The results show that the relative nonlinear coefficient is related to pore length, pore width, and porosity, providing a reference for detecting the porosity of composite materials using nonlinear ultrasonic technology.
Article
Chemistry, Physical
Jing Wang, Ri-Wei Xu, Cheng-Zhong Wang, Jin-Ping Xiong
Summary: The preparation and characterization of a polyaniline-silver-sulfur nanotube composite were reported in this paper. The introduction of silver into the composite cathode material can effectively solve the poor conductivity of sulfur and improve the performance of Li-S batteries.
