Article
Multidisciplinary Sciences
Xiao-Chong Yu, Shui-Jing Tang, Wenjing Liv, Yinglun Xu, Qihuang Gong, You-Ling Chen, Yun-Feng Xiao
Summary: An ultrasensitive optofluidic biosensor based on microbubble cavity with interface whispering gallery modes is reported, which has a low detection limit and small sample consumption, enabling the detection of single DNA.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Electrical & Electronic
F. Bellarmine, Senthil Kumar Eswaran, Ramanjaneyulu Mannam, M. S. Ramachandra Rao
Summary: The Au-coated ZnO microrods grown on Si substrate exhibit whispering gallery modes in the near band edge region, blue shifting with decrease in rod size, and significant splitting into two branches. The enhancement in WGMs in Au-coated ZnO rods compared with as-grown rods is attributed to plasmon enhancement. The stability of Au-coated ZnO in ambient conditions suggests great potential for small-volume devices and microlasers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Optics
Xavier Zambrana-Puyalto, Davide D'Ambrosio, Gianluca Gagliardi
Summary: Whispering gallery modes are light modes that arise in cylindrically symmetric structures, with intensity profile strongly confined around the interface. Analytical demonstration shows that the coupling mechanism is related to angular momentum matching between inner WGMs of the sphere and incident beam. The model quantitatively predicts optical coupling efficiency for any tangential position of the incident beam.
LASER & PHOTONICS REVIEWS
(2021)
Article
Nanoscience & Nanotechnology
Zhiyi Yuan, Xin Cheng, Tsungyu Li, Yunke Zhou, Yifan Zhang, Xuerui Gong, Guo-En Chang, Muhammad D. Birowosuto, Cuong Dang, Yu-Cheng Chen
Summary: Phycobiliproteins, a class of light-harvesting proteins found in cyanobacteria and microalgae, have attracted significant interest in bioenergy and sustainable devices due to their ability to convert light into electricity. A novel scheme has been proposed to enhance biological light-harvesting through light-matter interactions at the biointerface of whispering-gallery modes. By utilizing microdroplets as a carrier for light-harvesting biomaterials, strong local electric field enhancement and photon confinement at the cavity interface led to significantly enhanced biophotoelectricity.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Xiaoyu Shi, Wanting Song, Dan Guo, Junhua Tong, Tianrui Zhai
Summary: In order to achieve a higher level of secure communication, efforts have been made to develop encryption and anticounterfeiting strategies. One significant approach is the concept of a spectral encryption based on selectively visualized spectral modes in random lasers. By coupling with external whispering gallery mode cavity, hidden localized lasing modes with special multiple-peaks spectra are selected for secure information encryption.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Yann Lecieux, Dominique Leduc, Corentin Guigot, Marc Francois, Cyril Lupi
Summary: This paper investigates the use of Whispering Gallery Modes to measure the six components of a homogeneous strain tensor within a sphere. A direct model is established and linearized to obtain the relationship between the strain field and the wavelength shifts of the resonant modes. The expressions are then generalized to six circles, and an inverse system is computed to determine the six strain components. The theoretical performances of the sensor are finally evaluated, showing a high level of accuracy.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Boris Brun, Viet-Hung Nguyen, Nicolas Moreau, Sowmya Somanchi, Kenji Watanabe, Takashi Taniguchi, Jean-Christophe Charlier, Christoph Stampfer, Benoit Hackens
Summary: When confined in circular cavities, graphene charge carriers occupy whispering gallery modes (WGMs) similarly to classical acoustic and optical fields. The study successfully demonstrated the transduction of WGMs to the outside world through a novel configuration, showing mode selectivity and potential for designing disruptive quantum devices. This work provides a proof of concept for graphene whisperitronic devices.
Article
Chemistry, Multidisciplinary
Emanuele Marino, Harshit Bharti, Jun Xu, Cherie R. Kagan, Christopher B. Murray
Summary: In this work, we fabricate tunable optical microresonators using semiconductor nanocrystals. By changing the surface chemistry and initiating photo-oxidation of the nanocrystals, we are able to effectively tune the cavity length and refractive index of the microresonator. This study provides a new approach for constructing optical circuits.
Article
Physics, Applied
Yunfeng Liang, Hai Zhu, Huying Zheng, Ziying Tang, Yaqi Wang, Haiyuan Wei, Ruijiang Hong, Xuchun Gui, Yan Shen
Summary: The research findings indicate that with an increase in the cavity size, the competition between different orders of lasing modes will become more intense, with a significant polarization dependence for high-order whispering gallery mode (WGM) lasing. Furthermore, the competition of WGM lasing modes is strongly influenced by the diameter of cavities and excitation intensities.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Optics
Akihiro Kameda, Hiroyuki Tajima, Jun-ichi Yamada, Takeshi Komino
Summary: This study investigates the resonance of whispering gallery mode (WGM) in bowl-shaped microresonators. It is found that there is no mode coupling among the WGMs in the microbowls, which is attributed to the absence of a planar stilbene thin film between the WGM resonators.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Mohd Hafiz Jali, Hazli Rafis Abdul Rahim, Md Ashadi Md Johari, Maslinda Mat Sharif, Siti Halma Johari, Siddharth Thokchom, Habibah Mohamed, Moh Yasin, Sulaiman Wadi Harun
Summary: This letter demonstrates a humidity sensor using a microsphere resonator and ZnO nanorods coated glass, showing a significant response to humidity levels ranging from 35%RH to 85%RH with a sensitivity of 0.014 2 nm/%RH. The proposed sensor enhances interaction between the whispering gallery mode and surrounding analyte with the assistance of ZnO nanorods coated glass.
OPTOELECTRONICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Elisa Will, Luke Masters, Arno Rauschenbeutel, Michael Scheucher, Juergen Volz
Summary: The study demonstrates trapping of a single Rb-85 atom approximately 200 nm away from the surface of a whispering-gallery-mode bottle microresonator, and shows the observation of vacuum Rabi splitting in the excitation spectrum of the atom-resonator system. This first stable and controlled interaction of a single atom with the whispering-gallery mode in the strong coupling regime has potential for implementing quantum protocols and applications utilizing the chiral atom-light coupling in such resonators.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Yury E. Geints, Igor Minin, Oleg Minin
Summary: A perforated microsphere with an air-filled pinhole is studied, and the pinhole isolates the energy backflow region of a resonant mode, leading to an increased efficiency in optical trapping.
Article
Optics
Botao Fu, Renhong Gao, Jintian Lin, Ni Yao, Haisu Zhang, Min Wang, Lingling Qiao, Wei Fang, Ya Cheng
Summary: This study reveals an effective and controllable mode trimming and clustering mechanism in microresonators, leading to the generation of polygon and star modes. Various modes are observed in sequence within a single microresonator by tuning the excitation wavelength or varying the coupling position.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Physical
Andrey P. Tarasov, Arsen E. Muslimov, Vladimir M. Kanevsky
Summary: This study explores the optical gain mechanisms in hexagonal ZnO microrods and demonstrates high-performance whispering gallery mode (WGM) lasers. The main contribution to stimulated emission (SE) in near-threshold excitation intensities is found to be inelastic exciton-electron scattering.
Article
Polymer Science
Tianze Zheng, Ting Li, Jiaxin Shi, Tianyu Wu, Zhuo Zhuang, Jun Xu, Baohua Guo
Summary: This study investigated the mechanical response and microstructural evolution of polyureas under uniaxial deformation. The results revealed that the macroscopic toughness of polyureas is attributed to the self-reinforcement of the microstructure and the stress-adaptive release of soft segments, shedding light on the development of better materials.
Article
Polymer Science
Tianyu Wu, Sivasurender Chandran, Yao Zhang, Tianze Zheng, Thomas Pfohl, Jun Xu, Guenter Reiter
Summary: This study investigates the characteristics of the critical primary nucleus in polymer crystallization using a combination of experimental and simulation models. The results suggest that classical nucleation theory may not be applicable for weakly supersaturated solutions.
Article
Polymer Science
Baihui Li, Yue Zhao, Xiaotong Chen, Zhiqi Wang, Jun Xu, Weichao Shi
Summary: The crystallization behavior of double emulsion droplets formed by PBA, PCL, and their blends was studied. It was found that crystal growth drives spherical liquid droplets to anisotropic solid microcapsules with orientation-sensitive birefringence. The composition of two polymers can regulate the transition from PBA-dominated shell to PCL-dominated shell.
Article
Polymer Science
Shujing Zhang, Tianyu Wu, Zhiqi Wang, Jiarui Han, Baohua Guo, Jun Xu
Summary: In this study, we investigated the nucleation pathways and growth rates of spherulites in blends of homopolymer/random copolymer. By analyzing the experimental results and applying theoretical equations, we determined the quantitative contribution of each crystallizable component to the secondary nucleation in the blends. Our findings reveal the microscopic mechanism for the nucleation of homopolymer and random copolymer chains in the blends.
Article
Multidisciplinary Sciences
Shijun Wang, Jiaxin Shi, Takayuki Shimizu, Jun Xu, Zhiping Xu
Summary: This study investigates the kinetic evolution of microstructures in heat-fusion thermoplastic interfaces and discusses the key factors affecting interface quality. Experimental results show that the quality of fused interfaces can be improved by reducing viscosity and interaction parameter. Simulation and experimental results indicate that the stiffness and strength of the interfaces are controlled by inter-diffusion and entanglement of polymer chains.
SCIENTIFIC REPORTS
(2022)
Editorial Material
Crystallography
Jun Xu, Guenter Reiter, Rufina G. Alamo
Article
Polymer Science
Brahim Bessif, Thomas Pfohl, Barbara Heck, Yaser Alshetwi, Emna Khechine, Jun Xu, Guenter Reiter
Summary: By using a hydrophobic-hydrophilic block copolymer, researchers created sandwich-like platelets in a solution through crystallization and observed changes in thickness and morphology when exposed to humid air.
Article
Polymer Science
Yeyuan Hu, Yang Liao, Yanyan Zheng, Kosuke Ikeda, Ryoji Okabe, Ruifen Wu, Ryota Ozaki, Jun Xu, Qingyan Xu
Summary: The influence of cooling rate on the crystallization behavior of a semi-crystalline polypropylene was studied using the flash differential scanning calorimetry method. The results showed that as the cooling rate increases, the crystallization temperatures and crystallinity decrease.
Article
Polymer Science
Zhiqi Wang, Ranlong Duan, Xuan Pang, Rongling Wu, Baohua Guo, Jun Xu
Summary: Determining the size of critical nuclei in single-component crystals and stereocomplex crystals (SCs) has been a challenge. By diluting different components and analyzing the nucleation kinetics, we found that a critical secondary nucleus of an SC bulk crystal consists of 22-27 L-lactide units and the same number of D-lactide units when crystallized from melt.
Article
Biochemistry & Molecular Biology
Sunan Tian, Kaihuan Shi, Jun Xu, Baohua Guo
Summary: High molecular weight fully biobased poly(propylene succinate-co-2,5-thiophenedicarboxylate) (PPSTF) random copolyesters based on 2,5-thiophenedicarboxylic acid (TFDCA) were synthesized and their properties were systematically investigated. The copolyesters showed cocrystallization and the TFDCA units had stronger crystallization capability. They exhibited excellent thermal stability and mechanical properties that can be controlled by adjusting the ratio of flexible to rigid segments. The copolyesters also had superior gas barrier properties, even with a high content of PS units. The selected lipase could degrade the copolyesters with up to 60 mol% PTF units, and the nonbiodegradable-biodegradable transition occurred at a low sequence length of aromatic PTF units. Compared to TA-based and FDCA-based analogues, the degradation rate of PPSTF60 was between them. These findings have promising implications for green packaging and other applications.
Article
Chemistry, Multidisciplinary
Emna Khechine, Sebastian Noack, Helmut Schlaad, Jun Xu, Gunter Reiter, Renate Reiter
Summary: We investigated the hydration state of PEG in PEG-b-PLLA diblock copolymer Langmuir monolayers. Hydrated PEG blocks formed bundles of concentric ring-like filaments, while dehydrated PEG blocks packed into a dense polymer brush. The change in curvature of the filaments provided a means for distinguishing between the hydrated and dehydrated states of PEG.
Article
Chemistry, Physical
Wenqi Zou, Hongli Bian, Jinjing Guo, Jun Xu, Baohua Guo
Summary: In this study, titania-silica composite aerogels with resistance to hydrolysis and large specific surface area were prepared and further used as efficient catalysts for PBS polycondensation reactions. The composite aerogels exhibited high specific surface area and Lewis acid content, and showed excellent catalytic activity for the polycondensation reaction of PBS. The use of the composite catalyst resulted in the synthesis of high molecular weight PBS and reduced the end carboxyl group content in the products.
Article
Chemistry, Multidisciplinary
Sunan Tian, Yan Du, Pujin Wang, Tong Chen, Jun Xu, Huimin Yu, Baohua Guo
Summary: The need for high-performance bioplastics poses new challenges for the design and preparation of sustainable bioplastics. This study systematically investigates the effects of different isomers of thiophenedicarboxylic acids (TFDCAs) on the synthesis and properties of polyesters. The biobased polyester based on the 3,4-TFDCA isomer demonstrates superior gas and water vapor barrier properties and exhibits strong antibacterial effects.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jing Tian, Xiaoliang Cheng, Baohua Guo, Jun Xu
Summary: This study established a laboratory test method for evaluating the film-blowing processability of biodegradable materials and proposed key indicators. The generalizability of these indicators was verified, and the optimal formulation for PHBHHx was successfully validated. Finally, a quantitative relation between material formulation, key indicators, and film-blowing processability was developed to guide blown film processing and formulation design.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiaxin Shi, Zhiqi Wang, Tianze Zheng, Xueyan Liu, Baohua Guo, Jun Xu
Summary: The research introduces a synthesis strategy to create thermal and UV light adaptive polyurethane elastomers with high strength, self-healing capability, surface tunable properties, and patternable functions for photolithography-transfer printing flexible circuits.
MATERIALS HORIZONS
(2022)
