Article
Optics
Xiangpeng Yang, Decai Li, Xiangshen Meng, Qian Li, Huaiwei Zhang, Jiying Peng
Summary: This paper investigates the intensity-dependent nonlinear optical properties of Fe3O4 nanoparticle suspension exposed to 1064 nm picosecond laser pulses using the Z-scan technique. The study reveals a new type of saturation and reverse-saturation absorption curves at different excitation power levels, accompanied by a corresponding change in nonlinear refraction behavior from self-defocusing to self-focusing as the exciting energy increases. These tunable nonlinear optical properties are attributed to intervalence charge transfer.
OPTICS AND LASER TECHNOLOGY
(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
Chemistry, Multidisciplinary
Niklas O. Junker, Anja Lindenau, Michael Ruetten, Marcel Lach, Alexander Nedilko, Dmitry N. Chigrin, Gero von Plessen, Tobias Beck
Summary: The optical properties of 3D metacrystals made of gold nanoparticles in protein nanocages are investigated. These metacrystals have good structural and optical quality with sizes in the tens of micrometers range. Through microspectroscopy measurements and model calculations, it is shown that the metacrystals exhibit plasmonic absorption in the green wavelength range and are mostly transparent in the red and infrared ranges. By using empty nanocages as placeholders in the metacrystal lattice, the absorption strength of the metamaterial can be controlled. Measurements on a pyramidal metacrystal demonstrate deflection of visible light, indicating anomalous refraction at short wavelengths and normal refraction at long wavelengths. The refractive dispersion is attributed to the optical dispersion relation of the plasmonic metamaterial.
ADVANCED FUNCTIONAL MATERIALS
(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, Ceramics
Yuye Zhao, Ningning Dong, Pengpeng Qiu, Wan Jiang, Jun Wang, Lianjun Wang, Shijia Gu, Beiying Zhou, Wei Luo
Summary: Silica glass with homogeneously distributed Ag NPs was successfully obtained through Spark Plasma Sintering of Ag NPs encapsulated in mesoporous silica. The low-temperature sintering property of Ag NPs allowed them to be directly trapped in the derived silica glass with small particle size, exhibiting excellent third-order nonlinear optical properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
R. Fathima, A. Mujeeb
Summary: Ligand-free Au-Pt bimetallic nanoparticles were synthesized using laser ablation, showing enhanced nonlinear optical and thermo optical characteristics compared to mono metallic nanoparticles and pre-irradiation colloidal mix.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Applied
R. Fathima, A. Mujeeb
Summary: This study investigated the third order non-linear optical behavior of natural Curcumin dye samples with varying concentrations of silver nanoparticles using the open aperture Z-scan method. It was observed that the optical behavior, such as non-linear optical response, optical limiting properties, and fluorescence emission of the Curcumin samples, showed substantial enhancement with increasing concentration of the silver nanoparticles incorporated into the system.
Article
Chemistry, Physical
Dipanjan Banerjee, Sree Satya Bharati Moram, Chandu Byram, Jagganath Rathod, Twinkle Jena, Gopala Krishna Podagatlapalli, Venugopal Rao Soma
Summary: The research presents the outcomes of extensive femtosecond nonlinear optical studies on TiO2 and Ag-doped TiO2 nanoparticles. It was observed that Ag-TiO2 nanoparticles exhibited a significant preference for three-photon absorption and had a higher nonlinear susceptibility compared to pure TiO2 nanoparticles under 1 kHz pulse excitation. Additionally, the synthesized nanocomposites showed a noteworthy presence of three-photon absorption in the near-IR regime, which is a rare observation in these types of nanoparticles.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
K. Keshavamurthy, B. N. Swetha, Fatemah Farraj Al-Harbi, G. Jagannath, Aljawhara H. Almuqrin, M. Sayyed, Samia Ben Ahmed, A. G. Pramod, Shivaraja Itigi, P. Ramesh, D. Rajeshree Patwari, Narlagiri Linga Murthy, K. N. Sathish, S. Venugopal Rao
Summary: The study comprehensively investigated the effect of silver nanoparticles on tuning the optical nonlinear characteristics of Sm3+ doped borate-based glasses using the Z-scan technique. The outcomes showed reverse saturable absorption and positive refraction nonlinearity, indicating the potential of these materials for NLO device applications in the near-infrared region.
Article
Chemistry, Multidisciplinary
Jijuan Jiang, Yang Jia, Tong Wu, Yachen Gao
Summary: The nonlinear refraction of silver nanoparticles in n-hexane was found to exhibit a transition from self-focusing to self-defocusing, with self-focusing occurring at low excitation intensity and self-defocusing at high excitation intensity. The coexistence of self-focusing and self-defocusing was observed at moderate excitation intensity. The experimental results were analyzed in terms of third-order and fifth-order nonlinear refractive effects, with self-focusing caused by positive third-order nonlinear refraction and self-defocusing induced by negative fifth-order nonlinear refraction.
Article
Chemistry, Physical
R. Fathima, A. Mujeeb
Summary: The study reports laser-induced synthesis of gold, silver, and gold-silver alloy nanoparticles in water and their nonlinear optical properties. The ability to fine-tune the nonlinear optical characteristics of nanoparticles by controlling the volume ratios of gold and silver in the alloy nanoparticles makes them promising candidates for optical limiting and opto-thermal applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Nikolaos Chazapis, Michalis Stavrou, Georgia Papaparaskeva, Alexander Bunge, Rodica Turcu, Theodora Krasia-Christoforou, Stelios Couris
Summary: This study focuses on the synthesis and characterization of iridium (Ir)-based nanohybrids with different chemical compositions. The nanohybrids, including PVP-IrO2, PVP-Ir/IrO2, and non-coated Ir/IrO2 nanoparticles, were synthesized using various methods and characterized through XPS and STEM. The results demonstrate that these nanohybrids exhibit exceptional nonlinear optical (NLO) response and optical limiting (OL) efficiency, making them potential competitors in photonic and optoelectronic applications. Moreover, the choice of synthetic method significantly influences the NLO properties of the nanohybrids, suggesting the possibility of tailor-made NLO properties for specific applications in photonics and optoelectronics.
Article
Instruments & Instrumentation
N. Chowdareddy, Ashok R. Lamani, A. G. Pramod, G. Jagannath, K. Keshavamurthy, P. Ramesh, Dalal Abdullah Aloraini, Aljawhara H. Almuqrin, M. I. Sayyed, B. S. Avinash, H. S. Jayanna, Hamad Syed, S. Venugopal Rao
Summary: This study demonstrates the controllable third-order nonlinear optical properties of borate-based glass samples doped with metal nanoparticles and rare earth ions through an annealing process. The sensitive Z-scan method was used to analyze the nonlinear optical absorption and refraction. The results show that the enhancement in the nonlinear optical coefficients is attributed to the local field enriched by metallic silver nanoparticles near the rare earth ions. The NLO coefficients improve with longer heat treatment duration, but the nonlinear absorption coefficient decreases. The borate-based glass samples annealed for 40 hours at 450 degrees Celsius with rare earth ions and metallic silver nanoparticles are beneficial for optical communication and nonlinear photonic device applications.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
S. Gopinath, M. Mayakannan, S. Vetrivel
Summary: This study presents the synthesis of silver doped cobalt oxide nanoparticles using a microwave-assisted method, and investigates their structural, optical, and antibacterial activities. The results show that the doping concentrations affect the crystallite size, with the highest activity observed at 20% silver doping.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Mohamed Ashour, Hameed G. Faris, Hanan Ahmed, Samar Mamdouh, Kavintheran Thambiratnam, Tarek Mohamed
Summary: This study experimentally investigated the nonlinear optical properties of Au nanoparticles prepared using the laser ablation method. The Au nanoparticles exhibited reverse saturable absorption behavior and acted as a self-defocusing material when the excitation wavelength or incident power were modified.
Article
Optics
Zhi-Huan Pang, Meng Liu, Ai-Ping Luo, Yi Xu, Wen-Cheng Xu, Songnian Fu, Zhi-Chao Luo
Summary: We propose a novel mode-dependent gain equalizer using a few-mode chirped fiber Bragg grating (FM-CFBG) to effectively mitigate the mode-dependent gain in an all-fiber 2-mode EDFA. The equalizer based on FM-CFBG offers compact size, low insertion loss, and wavelength scalability, making it meaningful for long-haul MDM transmission.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yiwei Qiu, Chenliang Ding, Gangyao Zhan, Mengdi Luo, Jisen Wen, Mengbo Tang, Chun Cao, Wenjie Liu, Liang Xu, Bihu Lv, Dazhao Zhu, Cuifang Kuang, Xu Liu
Summary: This article proposes a novel method to simultaneously reduce the axial and lateral feature sizes of PPI-DLW. By employing a pseudo 3D hollow focus, a suspended nanowire with an isotropic 30-nm feature size was realized, thereby improving the capabilities of PPI-DLW for fabricating arbitrary 3D structures.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Manzhuo Wang, Jianbo Yue, Zhentao Yao, Tingyu Liu, Xiaoqiang Sun, Yuanda Wu, Daming Zhang
Summary: A silica waveguide 1×8 thermo-optic switch consisting of cascaded three-stage Mach-Zehnder interferometers (MZIs) is successfully demonstrated. The switch utilizes a multimode interference (MMI) coupler in the MMI-MZI 1×2 switch unit for its wavelength insensitivity and favorable fabrication tolerance. The switch design and optimization is based on the beam propagation method (BPM) and implemented using standard CMOS technologies. Experimental results show that the switch meets the requirements for insertion loss and crosstalk at 1550 nm wavelength, and also performs well in a wide wavelength range.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
H. M. de la Cruz, E. D. Hernandez-Campos, E. Ortiz-Ricardo, A. Martinez-Borquez, I. Rosas-Roman, V. Contreras, G. Ramos-Ortiz, B. Mendoza-Santoyo, Cecilia I. Zurita-Lopez, R. Castro-Beltran
Summary: Acoustic levitation is an important contactless manipulation technique in various fields. This study presents an affordable phased-array levitator that can stably trap micrometer dye-doped droplets in the air, enabling the creation of microlasers. The levitated microlasers exhibit comparable optical lasing features to On-a-Chip devices, with a maximum Q-factor of approximately 105 and a minimum lasing threshold of approximately 150 nJ cm-2.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yuqi Wang, Zilong Zhang, Suyi Zhao, Wei He, Xiaotian Li, Xin Wang, Yuchen Jie, Changming Zhao
Summary: This paper investigates the impact of localized defects in SLM devices on structured light generation and demonstrates the reconstructed light field results under different defect states using CGH loaded onto the DMD. The results show that central defects have minimal influence on the reconstructed light field, while edge defects have a significant impact. This study expands the application scenarios for the generation of structured light beams with SLM.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ashraf A. A. Beshr, Hossam El-Din Fawzy, Ehab A. A. Eldin, Jong Wan Hu, Fathi A. Abdelmgeed
Summary: This paper introduces the application of digital measuring techniques, specifically Digital Close Range Photogrammetry (DCRP), in the detection of deformation in post-tensioned structural elements (PTSEs). The use of digital equipment and a terrestrial laser scanner (TLS) allows for highly accurate monitoring of PTSE camber, with deviations not exceeding 0.01 mm.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Shihao Gou, Danping Huang, Shipeng Liao, Fan Luo, Yang Yuan, Liang Liu, Xiaomei Wen
Summary: This paper proposes an online intelligent detection method for cable pitch defects in the field of optical cable manufacturing. The method utilizes a multi-sensor fusion image acquisition platform and deep learning technology to achieve accurate detection of pitch defects in optical cables.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Tun-Yao Hung, David W. U. Chan, Ching-Wei Peng, Chi-Wai Chow, Hon Ki Tsang
Summary: We present the first experimental demonstration of a high-capacity short-reach optical communication link which utilizes LSTM and DNN to achieve 300 Gbit/s 8-level pulse amplitude modulation (PAM8) generated by a single microring modulator. The experimental results show that 300 Gbit/s and 270 Gbit/s PAM8 modulation can be achieved at back-to-back and after 1 km transmission respectively.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Long Zhang, Li Pei, Jianshuai Wang, Jingjing Zheng, Kaihua Hu, Zhiqi Li, Tigang Ning, Jing Li, Li Zhong, Ruisi He
Summary: The amplification of long-haul mode division multiplexing (MDM) transmission systems is currently achieved through three steps, which can result in complexity and degraded transmission performance. To address this issue, this paper proposes an in-line few-mode erbium-doped fiber amplifier (FM-EDFA) based on cladding pumping, which enables simultaneous amplification and transmission in MDM systems. Experimental results demonstrate that the in-line FM-EDFA has excellent performance and shows great potential for practical long-haul transmission systems.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Chong Wang, Miaomiao Li, Jiahao Yang, Bingli Zhu, Jianghao Han, Wenbin Dang
Summary: This paper introduces the design of drive circuits using step recovery diodes and RF bipolar transistors to produce narrow pulse lasers, achieving the reduction of system size, power consumption and cost.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Ziqian Zhang, Liangyu Zhao, Chaorun Si, Yang Tian, Shilin Xu
Summary: A Hastelloy C276 coating was prepared on a martensitic stainless-steel substrate using laser melting deposition, resulting in a coating with high resistance to cavitation erosion. The coating exhibited a thick, progressively changing grain morphology from bottom to top, and the grains grew in a specific angle to the substrate plane. A compositional mixing zone was formed at the interface, forming a stable metallurgical bond. The coating showed a significantly improved hardness and enhanced resistance to cavitation erosion compared to the substrate.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Cui-Hong Li, Chao-Xiong He, Yuan-Yuan Ma, Jin-Chuan Wang, Ying Dong, Shao-Chong Zhu, Xiao-Wen Gao, Hui-Zhu Hu
Summary: In this paper, a non-contact optical measuring method for characterizing nanoparticles using optical tweezers is presented. The method relies on the optical polarization and scattering of nanoparticles, providing insights into both shape and size parameters. Experimental results show that the method can accurately measure the shape and size of nanoparticles, making it an effective tool for identifying and studying individual nanoparticles.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Magdalena Zieba, Cuma Tyszkiewicz, Katarzyna Wojtasik, Krystian Pavlov, Pawel Chaber, Ewa Gondek, Jacek Niziol, Roman Rogozinski, Pawel Kielan, Pawel Karasinski
Summary: This work presents a study on low-loss waveguide layers for planar evanescent wave sensor applications. Crack-free SiOx:TiOy composite layers with refractive indices of approximately 1.65 were fabricated using a sol-gel method and dip-coating technique. The fabricated layers exhibited good waveguide properties and optical homogeneity.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Yali He, Jiao Tang, Zhongyang Li, Yaowu Hu
Summary: In this paper, a lithography-free broadband absorbing metasurface consisting of Ag nanoparticles with ultrafine nanogaps is demonstrated. The experimental results and numerical simulations show that the horizontally compressed Ag nanoparticles possess smaller nanogaps for high sensitivity, uniformity, and stability. The novel substrate also exhibits insensitivity to the incident or observation angle in an ambient environment and has promising practical applications.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Linqing Li, Chengwei Yang, Zhuo Wang, Kun Xiao, Rui Min
Summary: In this study, a stretchable polymer optical fiber with a sandwich structure was proposed for sleep monitoring. The fiber improved the pressure sensitivity of the mattress and enabled the measurement of respiratory rate, heart rate, and body motion information.
OPTICS AND LASER TECHNOLOGY
(2024)
