Article
Chemistry, Physical
Julien-Bilal Zinoune, Christophe Cassagne, Martinus H. V. Werts, Matthieu Loumaigne, Mihaela Chis, Georges Boudebs
Summary: Using the continuous-wave single-beam Z-scan technique, the absorption and scattering efficiencies of spherical gold nanoparticles of varying diameter were experimentally determined for three different wavelengths. The experimental procedure was modified to accommodate higher absorption rates by using top-hat beams instead of Gaussian beams. The obtained thermal lens data were in good agreement with the theoretical values from Mie theory, confirming the validity of the approach. The results showed an increase in photothermal efficiency with smaller particle diameters and shorter wavelengths.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Spectroscopy
Sakshi, Bikash Chandra Swain, Anand Kant Das, Nitesh Kumar Pathak, Umakanta Tripathy
Summary: This study investigated the nonlinear photophysical properties of dopamine using the CA Z-scan technique and theoretical simulations. The results revealed that the nonlinear property of dopamine is governed by the thermo-optical effects, and the CA Z-scan profiles can be modulated by parameters such as phase-shift, orders of absorption, and time dependency. The findings contribute to the understanding of the relationship between nonlinearity and dopamine homeostasis and associated diseases.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Optics
V. S. Zanuto, J. F. M. dos Santos, M. L. Baesso, T. Catunda
Summary: Thermal lens and Z-scan are two essential techniques for determining the optical properties of materials, with each method suitable for different effects depending on the experimental arrangement. This paper analyzes the thermal lens effect in time-resolved Z-scan measurements and evaluates the difference between thermal and electronic effects on the Z-scan method.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Christophe Cassagne, Oumar Ba, Georges Boudebs
Summary: The thermal lens effect is analyzed as a time-resolved Z-scan measurement using cw-single Gaussian beam configuration. The main characteristics of the measurement method are determined. The evaluation of the measurement error, linearity of the response, and extraction of thermo-optical characteristics of absorbing liquids are also discussed. The results demonstrate the feasibility of determining absorption and scattering efficiencies on gold nanoparticles.
Article
Thermodynamics
Amin Karamati, Nicholas Hunter, Huan Lin, Hamidreza Zobeiri, Shen Xu, Xinwei Wang
Summary: In this study, a rigorous approach is developed for data processing and thermal characterization of micro/nanoscale wires using Transient Electro-Thermal (TET) and Transient Photo-Electro-Thermal (TPET) methods. The methods offer an effective way to measure thermal diffusivity with excellent linearity and measurement accuracy.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Hamid Rashidnejad, Hamideh Motiei, Mohammad Ramezanitaghartapeh, Nader Noroozi Pesyan, Ahmad Poursattar Marjani, Andrew Ng Kay Lup
Summary: In this research, the third-order nonlinear characteristics of novel azo dyes based on 5-hydroxyquinoline were studied. The Z-scan technique was used to calculate the nonlinear absorption coefficient and nonlinear refractive index. The study also investigated the effect of substituents on the characteristics and demonstrated the potential application of these dyes in optical devices.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Chemistry, Physical
M. I. Rosli, N. Basar, N. Mohd Rozi, G. Krishnan, S. W. Harun, E. S. Sazali, M. S. Aziz
Summary: This study aimed to determine the nonlinear optical response of extracted alpha-mangostin using various characterization techniques. The results showed that the alpha-mangostin exhibited a self-defocusing effect at an excitation wavelength of 532 nm, with recorded nonlinear refractive index values compared to theoretical fitting curves. The study successfully captured the nonlinear refraction of alpha-mangostin, showcasing its unique NLO characteristics.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Optics
Aristides Marcano Olaizola, Jose Luis Luna Sanchez
Summary: Thermal lens and thermal mirror Z-scan experiments were conducted to study the photothermal properties of semiconductors. The experimental results were effectively fitted using a model based on the Fresnel diffraction approximation, showing good agreement with previously reported data.
APPLIED PHYSICS B-LASERS AND OPTICS
(2021)
Article
Chemistry, Physical
Georges Boudebs
Summary: The study presents a general analysis of the diffracted far field due to thermal lens heating using Gaussian beams, deriving more accurate simplified formulas for measuring thermal phase shift while emphasizing the reliability of temperature estimation in absorbing media using time-resolved or steady-state techniques. The extension of the calculation to image formation in a 4f system is also discussed.
Article
Optics
P. Gotovski, P. Slevas, S. Orlov, O. Ulcinas, V Jukna, A. Urbas
Summary: The Pancharatnam-Berry phase is utilized in optics to design and create various flat special optical elements, including top-hat converters. This study focuses on engineering efficient vectorial top-hat converters inscribed in glass using high-power femtosecond laser pulses. The research investigates the impact of different parameters on the quality of the phase-encoded top-hat converter and examines the generation of the top-hat beam under imperfect conditions. Experimental verification of the concept is also provided.
Article
Optics
Yoonsuk Kim, Seungho Park, Byung-Kuk Kim, Wang-Jun Park, Hyoung June Kim
Summary: The experimental and theoretical investigation of laser lift-off using a 355nm DPSS laser demonstrated successful delamination of a PI substrate from a glass carrier, leaving a residual PI layer of approximately 100nm on the glass surface. The process involved intense laser pulses inducing fast ablation inside the PI substrate, causing delamination along the PI/glass interface. The study also revealed that overlapping irradiation of laser pulses could reduce the threshold fluence by 50% compared to non-overlapping irradiation, with a slight increase in residual PI layer thickness with higher pulse repetition rates.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Mohammad Reza Moghaddam, Davood Razzaghi, Marzieh Akbari, Mohammad Barzan, Mohsen Ruzbehani
Summary: This article experimentally studied the thermal lens effect in a CTH:YAG laser crystal and found that the dioptric power of the lens increases with pumping energy. Additionally, the impact of flashlamp repetition rate and coolant temperature on the lens effect was also discussed.
Article
Optics
Youngbin Na, Do-Kyeong Ko
Summary: A method based on conformal mapping is presented to generate top-hat line-shaped beams, using Cartesian to log-polar coordinate transformation and amplitude modulation to transform circular symmetric input beams into straight lines. Experimental results demonstrate that this transformation can effectively convert any input beams with circular symmetry and produce a top-hat line-shaped focus with steep edges and a high aspect ratio.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Sabin Kumar Karki, Juha Ala-Laurinaho, Ville Viikari
Summary: This article presents a low-profile, efficient, and scanloss-reduced integrated metal-lens antenna (IMLA). By tilting the radiation pattern of the feed and using asymmetrical dielectric pins, the scan loss of the IMLA is reduced, resulting in high radiation efficiency and gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
M. Reveillard, M. Viteau, G. Santarelli, B. Battelier, G. Guiraud, N. Traynor, L. Antoni-Micollier, B. Desruelle, D. Comparat
Summary: By performing a 2D blue detuned Sisyphus collimation of a cesium beam, we achieved faster cooling and denser atomic beams. A fibered laser delivering up to 500 mW fiber-coupled optical power was developed, showing that a simple top-hat beam is more efficient than a Gaussian one.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Nanoscience & Nanotechnology
Xiao Jin, Chun Chang, Weifeng Zhao, Shujuan Huang, Xiaobing Gu, Qin Zhang, Feng Li, Yubao Zhang, Qinghua Li
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Electrochemistry
Xiao Jin, Chun Chang, Zhongping Chen, Qinghua Li
ELECTROCHIMICA ACTA
(2018)
Article
Electrochemistry
Xiao Jin, Lai You, Zhongping Chen, Qinghua Li
ELECTROCHIMICA ACTA
(2018)
Article
Electrochemistry
Qinghua Li, Haiyang Li, Xiao Jin, Zhongping Chen
ELECTROCHIMICA ACTA
(2018)
Article
Chemistry, Physical
Xiao Jin, Haiyang Li, Shujuan Huang, Xiaobing Gu, Huaibin Shen, Danyang Li, Xugu Zhang, Qin Zhang, Feng Li, Qinghua Li
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2018)
Article
Medicine, Research & Experimental
Kewei Liu, Kaizhe Chen, Qian Zhang, Lianfang Zhang, Yufei Yang, Changjun Guo, Jin Qi, Kai Yang, Fei Wang, Ping Huang, Lei Guo, Lianfu Deng, Changwei Li
LABORATORY INVESTIGATION
(2019)
Article
Nanoscience & Nanotechnology
Tingting Zhang, Xugu Zhang, Peizhi Yang, Jinke Bai, Chun Chang, Xiao Jin, Feng Zhao, Yan Huang, Feng Li
JOURNAL OF NANOMATERIALS
(2019)
Article
Engineering, Electrical & Electronic
Chenyang Guo, Yan Huang, Qin Pan, Tao Tao, Feng Li, Qin Zhang, Xiao Jin, Qinghua Li
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2019)
Article
Materials Science, Multidisciplinary
Jinke Bai, Chun Chang, Jiahu Wei, Chengtong Dong, Huashan Peng, Xiao Jin, Qin Zhang, Feng Li, Qinghua Li
OPTICAL MATERIALS EXPRESS
(2019)
Article
Chemistry, Physical
Feng Li, Jiahu Wei, Guoqing Liao, Chenyang Guo, Yan Huang, Qin Zhang, Xiao Jin, Shuiqing Jiang, Qunwei Tang, Qinghua Li
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2019)
Article
Cell Biology
Pei Yu, Kai Yang, Min Jiang
Summary: Nerve regeneration after spinal cord injury is regulated by many factors, including the distribution changes of RXR alpha in neurons and the upregulation of p66shc expression. RXR alpha inhibits nerve regeneration by promoting p66shc expression, and intervention of RXR alpha or p66shc can promote functional recovery after spinal cord injury.
OXIDATIVE MEDICINE AND CELLULAR LONGEVITY
(2021)
Article
Multidisciplinary Sciences
Jun Dai, Jialing Xie, Kai Yang, Wei He, Fukang Sun, Danfeng Xu, Min Jiang, Juping Zhao
Summary: This study evaluated rational indications for surgical intervention of adrenal lesions with calcification. The results showed that clinical benefit was significantly correlated with the maximum diameter of the lesion, while calcification distribution, calcification area, and internal enhancement had no significant correlation with clinical benefit. Therefore, a maximum diameter of 4.5 cm may be considered as the cutoff point for surgical intervention.
SCIENTIFIC REPORTS
(2022)
Article
Pharmacology & Pharmacy
Hao Tian, Tao Jiang, Kai Yang, Ruonan Ning, Tianqi Wang, Qi Zhou, Niandong Qian, Ping Huang, Lei Guo, Min Jiang, Xiaobing Xi, Xing Xu, Lianfu Deng
Summary: This study found that alpha-asarone (ASA), a compound derived from the traditional Chinese medicinal herb Acorus tatarinowii, can inhibit the activity of overactivated osteoclasts and reduce bone resorption. ASA's effects on osteoclastogenesis are dose-dependent and mediated through multiple signaling pathways. In an estrogen-deficiency-induced osteoporosis model, ASA also improved bone microstructure.
FRONTIERS IN PHARMACOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Zhijie Chen, Mengyuan Lv, Jing Liang, Kai Yang, Fan Li, Zhi Zhou, Minglong Qiu, Haoyi Chen, Zhengwei Cai, Wenguo Cui, Zhanchun Li
Summary: Postmenopausal osteoporosis is often associated with neuroendocrine changes in the hypothalamus, which are closely related to the microbial diversity, community composition, and intestinal metabolites of gut microbiota. This study revealed the existence of a neuroendocrine signal called neuropeptide Y (NPY) that mediates the brain-gut-bone axis and affects bone metabolism. The findings suggest that targeting NPY-mediated changes in gut microbiota could be a novel approach for treating postmenopausal osteoporosis.
Article
Chemistry, Multidisciplinary
Dongyu Li, Jinke Bai, Tingting Zhang, Chun Chang, Xiao Jin, Zhen Huang, Bing Xu, Qinghua Li
CHEMICAL COMMUNICATIONS
(2019)
