Article
Chemistry, Multidisciplinary
Lun Qu, Lu Bai, Chunyan Jin, Qiang Liu, Wei Wu, Bofeng Gao, Juntao Li, Wei Cai, Mengxin Ren, Jingjun Xu
Summary: Metasurfaces is an intriguing framework for nonlinear optics, offering compact design and flexibility in manipulating light. However, the nonlinearity is often limited due to the short interaction lengths with light. In this study, we demonstrate a record high efficiency of second harmonic generation using LN membrane metasurfaces, significantly improving the efficiency of nonlinear metasurfaces.
Article
Chemistry, Multidisciplinary
Yovan de Coene, Stijn Jooken, Olivier Deschaume, Valerie Van Steenbergen, Pieter Vanden Berghe, Chris Van den Haute, Veerle Baekelandt, Geert Callewaert, Stijn Van Cleuvenbergen, Thierry Verbiest, Carmen Bartic, Koen Clays
Summary: In this study, it is found that endogenous second-harmonic generation (SHG) from live cells is highly sensitive to changes in transmembrane potential (TMP), indicating the potential of using SHG as a label-free read-out tool for electrogenic cells.
Article
Multidisciplinary Sciences
Shingo Toyoda, Manfred Fiebig, Taka-hisa Arima, Yoshinori Tokura, Naoki Ogawa
Summary: Mirror symmetries play a crucial role in fundamental properties and conservation laws, with potential magnetoelectric cross-coupling when both spatial inversion and time reversal are broken. The giant nonreciprocal optical response observed in SHG of CuB2O4 is due to interference between magnetic-dipole and electric-dipole contributions, showing the potential for nonreciprocal nonlinear optical functionalities in multiferroics and magnetoelectrics. Resonantly enhanced magnetic-dipole transitions contribute significantly to the nonreciprocity, maximizing the effect despite the inherently weaker nature compared to electric-dipole transitions.
Article
Multidisciplinary Sciences
Shivangi Shree, Delphine Lagarde, Laurent Lombez, Cedric Robert, Andrea Balocchi, Kenji Watanabe, Takashi Taniguchi, Xavier Marie, Iann C. Gerber, Mikhail M. Glazov, Leonid E. Golub, Bernhard Urbaszek, Ioannis Paradisanos
Summary: Efficient second-harmonic generation (SHG) occurs for crystals with broken inversion symmetry, such as transition metal dichalcogenide monolayers. Here the authors show SHG tuning in bilayer MoS2 - an inversion-symmetric crystal - mediated by interlayer excitons.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Yann Foucaud, Bertrand Siboulet, Magali Duvail, Alban Jonchere, Olivier Diat, Rodolphe Vuilleumier, Jean-Francois Dufreche
Summary: A breakthrough method has been developed to predict and interpret SHG signal at the atomic level, showing the significant impact of bulk quadrupole contribution in the SHG response. The experimental results are in unprecedented agreement with the simulated responses.
Article
Optics
Junjun Ma, Fei Xie, Weijin Chen, Jiaxin Chen, Wei Wu, Wei Liu, Yuntian Chen, Wei Cai, Mengxin Ren, Jingjun Xu
Summary: LN metasurfaces with controllable SHG properties have been experimentally demonstrated, showing distinct enhancements for the SHG efficiency at Mie resonances. By changing geometric parameters and resonances of metasurfaces, authors manage to selectively boost the SHG efficiency at different wavelengths, paving the way for developing novel compact nonlinear light sources with high flexibility for applications like biosensing and optical communications.
LASER & PHOTONICS REVIEWS
(2021)
Article
Multidisciplinary Sciences
Junhao Li, Guangwei Hu, Lina Shi, Nan He, Daqian Li, Qiuyu Shang, Qing Zhang, Huange Fu, Linlin Zhou, Wei Xiong, Jianguo Guan, Jian Wang, Sailing He, Lin Chen
Summary: The authors demonstrate broadband enhanced second-harmonic generation in patterned multilayer hyperbolic metamaterial arrays, overcoming the typical narrow spectral bandwidth limitation of these materials. This approach allows for rainbow light trapping and boosted nonlinear light-matter interactions, showing promise for various important technologies.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Fan Yang, Cristian Ciraci
Summary: We present a theoretical study on second-harmonic generation from a singular metasurface, which strongly interacts with incident light and generates intense surface polarization, resulting in the generation of second-harmonic field. By using transformation optics, the calculation of nonlinear optical response is simplified, and the dependence on the incident angle is weak, making it potentially useful for all-angle harmonic generation. Furthermore, we investigate the symmetry dependence of second-harmonic generation in the far field and demonstrate an enhanced conversion efficiency under normal incidence by breaking the surface inversion symmetry.
Article
Chemistry, Multidisciplinary
Yun Zhao, Zhaoxi Chen, Cheng Wang, Yuanmu Yang, Hong-Bo Sun
Summary: In this experiment, efficient second-harmonic generation (SHG) and high-harmonic generation (HHG) were demonstrated from a LiNbO3 metasurface enhanced by guided-mode resonance. The metasurface showed high SHG efficiency and a wide range of HHG. This work may enable the development of compact coherent white-light sources in the deep ultraviolet region for spectroscopy and imaging applications.
Article
Optics
Sebastian Klimmer, Omid Ghaebi, Ziyang Gan, Antony George, Andrey Turchanin, Giulio Cerullo, Giancarlo Soavi
Summary: The study demonstrates a new method of achieving second-harmonic generation in MoS2 through all-optical modulation, with a modulation depth close to 100%, providing flexibility for the design of advanced nonlinear optical devices.
Article
Optics
Gia Quyet Ngo, Emad Najafidehaghani, Ziyang Gan, Sara Khazaee, Malte Per Siems, Antony George, Erik P. Schartner, Stefan Nolte, Heike Ebendorff-Heidepriem, Thomas Pertsch, Alessandro Tuniz, Markus A. Schmidt, Ulf Peschel, Andrey Turchanin, Falk Eilenberger
Summary: This study demonstrates a method to achieve second-harmonic generation in functionalized optical fibers by directly growing highly nonlinear MoS2 monolayers on the fiber's core. The approach is scalable and can be generalized to other materials and waveguide systems.
Article
Chemistry, Physical
Hui Zhao, Qichang An, X. Ye, B. H. Yu, Q. H. Zhang, F. Sun, Q. Y. Zhang, Fang Yang, Jiandong Guo, Jimin Zhao
Summary: By tuning the number of interfaces in LaTiO3/SrTiO3 superlattices, the non-linear optical susceptibility and second harmonic generation pattern can be controlled. AB-type nanostructures can also generate SHG signals, unlike traditional ABC-type nanostructures. Furthermore, temperature dependence and structural phase transition can enhance the intensity of SHG signals.
Article
Chemistry, Multidisciplinary
Jordan Fonseca, Geoffrey M. Diederich, Dmitry Ovchinnikov, Jiaqi Cai, Chong Wang, Jiaqiang Yan, Di Xiao, Xiaodong Xu
Summary: Magnetic field and temperature-dependent second harmonic generation (SHG) measurements were performed on MnBi2Te4 flakes with varying thickness. The dominant SHG signal was unexpectedly unrelated to both the magnetic state and layer number, suggesting a possible contribution from surface SHG. This study highlights the importance of considering surface contribution to inversion symmetry-breaking in van der Waals centrosymmetric magnets.
Article
Chemistry, Multidisciplinary
Yuan Zhang, Yangchun Tan, Yangda Dong, Liyufeng Dai, Chuanlai Ren, Fengyuan Zhang, Lingping Zeng, Feng An, Changjian Li, Boyuan Huang, Gaokuo Zhong, Jiangyu Li
Summary: The Materials Genome Initiative aims to accelerate the discovery, development, manufacture, and deployment of advanced materials. This study introduces a high-throughput scanning second-harmonic-generation microscope that enables rapid screening and probing of polar materials. The technique is applied to investigate ferroelectrics and demonstrate its high-throughput capabilities using compositional-gradient and thickness-gradient films.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yang Liu, Ya-Ping Gong, Shining Geng, Mei-Ling Feng, Despoina Manidaki, Zeyu Deng, Constantinos C. Stoumpos, Pieremanuele Canepa, Zewen Xiao, Wei-Xiong Zhang, Lingling Mao
Summary: Ge-based hybrid perovskite materials show great potential for second harmonic generation (SHG). Newly discovered Ge-based bromide perovskite materials exhibit tunable SHG responses and the high SHG efficiency is attributed to specific structural and theoretical factors.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Biochemistry & Molecular Biology
Georgi A. Georgiev, Mohammad Sharifian Gh, Jeff Romano, Karina L. Dias Teixeira, Craig Struble, Denise S. Ryan, Rose K. Sia, Jay P. Kitt, Joel M. Harris, Ku-Lung Hsu, Adam Libby, Marc G. Odrich, Tatiana Suarez, Robert L. McKown, Gordon W. Laurie
Summary: Complex lipids enriched with proteins at air/liquid interfaces reduce surface tension, maintaining the stability of the tear film on the eyes. Dry eye disease, affecting 7 to 10% of individuals globally, may be caused by alterations in specific proteome and lipidome, leading to incomplete processing of the protein lacritin's C-terminus and subsequent loss of tear stability. The turnover of lacritin proteoforms in tears can restore stability and prevent collapse of the tear film, demonstrating a natural slow release mechanism for maintaining epithelial homeostasis.
JOURNAL OF BIOLOGICAL CHEMISTRY
(2021)
Article
Biophysics
Michael J. Wilhelm, Mohammad Sharifian Gh, Tong Wu, Yujie Li, Chia-Mei Chang, Jianqiang Ma, Hai-Lung Dai
Summary: The bacterial surface charge is a critical characteristic that influences the cell's interaction with the environment. The second-harmonic light scattering method is capable of quantifying the surface charge by detecting molecular ions adsorbed on the exterior bacterial surface. This study reveals differences in molecular transport rates and adsorption saturation densities of different cellular ultrastructures.
BIOPHYSICAL JOURNAL
(2021)
Article
Chemistry, Physical
Hui Fang, Michael J. Wilhelm, Jianqiang Ma, Yi Rao, Danielle L. Kuhn, Zachary Zander, Brendan G. DeLacy, Hai-Lung Dai
Summary: The lifetime of hot electrons injected from Ag nanoplatelets to TiO2 nanorods was found to be 13.1 ± 1.5 fs, comparable to smaller spherical Ag nanoparticles. The larger surface to bulk ratio and larger surface area for direct contact with the semiconductor on Ag nanoplatelets explain the decrease in injection rate with increasing particle size. Ag nanoplatelets exhibit stronger coupling with TiO2 and higher efficiency as photosensitizers for photocatalysis due to their fast injection rate and stronger optical absorption compared to Au and dye molecules.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Bing Xue, Michael J. Wilhelm, Jun Han, Hai-Lung Dai
Summary: The study demonstrates that the reactivity of sulfur dioxide can be altered by vibrational or electronic excitation. Following coherent excitation of SO2 and monitoring the SO product through multiphoton ionization, the impact of excitation on reactivity is confirmed.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Engineering, Chemical
Mostafa Dadashi Firouzjaei, Mehdi Pejman, Mohammad Sharifian Gh, Sadegh Aghapour Aktij, Ehsan Zolghadr, Ahmad Rahimpour, Mohtada Sadrzadeh, Ahmad Arabi Shamsabadi, Alberto Tiraferri, Mark Elliott
Summary: A novel method of decorating polyamide forward osmosis membranes with silver-based metal azolate frameworks has been proposed to improve fouling and transport performance. By adding minimal additives, biofouling can be effectively suppressed while maintaining high selectivity and transport properties, with minimal generation of waste products.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Chemistry, Multidisciplinary
Hui Fang, Michael J. Wilhelm, Jianqiang Ma, Danielle L. Kuhn, Zachary Zander, Hai-Lung Dai
Summary: Photosensitized semiconducting nanomaterials have attracted attention for their applications in photocatalytic and photoelectronic devices. The size of the semiconductor nanoparticles can influence the diffusion and lifetime of photoexcited electrons. A physical model that includes all known electron dynamic processes provides quantitative explanations for the observed multiexponential decays. This universally applicable model can be used to analyze data from different laboratories.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Medicinal
Tong Wu, Michael J. Wilhelm, Yujie Li, Jianqiang Ma, Hai-Lung Dai
Summary: Indole signaling in bacteria plays an important role in antibiotic resistance, persistence, and tolerance. Exogenous indole can increase bacterial uptake of antimicrobials through interaction with the Mtr permease.
ACS INFECTIOUS DISEASES
(2022)
Article
Chemistry, Multidisciplinary
Tong Wu, Michael J. Wilhelm, Jianqiang Ma, Yujie Li, Yuhao Wu, Hai-Lung Dai
Summary: Phase transitions of lipid bilayer membranes affect the passive transport of molecules. This study measured the transport rate of a molecular cation across E. coli liposomes using second harmonic light scattering and found dramatic jumps in transport rate at the known phase transition points.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Ophthalmology
Karina Luiza Dias-Teixeira, Gh. Mohammad Sharifian, Jeff Romano, Fatemeh Norouzi, Gordon W. Laurie
Summary: The cornea and tear film play a crucial role in maintaining transparency and refraction of light in the eye. The avascular cornea serves as a model for studying the role of autophagy in homeostasis regulation. Mutations and inflammation can disrupt autophagic flux and lead to dystrophies or worsen inflammation. Novel topical therapies can be developed based on this model to restore homeostasis.
EXPERIMENTAL EYE RESEARCH
(2022)
Article
Optics
Tracy J. Baker, Russell G. Tonkyn, Christopher J. Thompson, Megan K. Dunlap, Paul G. Koster van Groos, Nikita A. Thakur, Michael J. Wilhelm, Tanya L. Myers, Timothy J. Johnson
Summary: This article presents the construction of a database of quantitative infrared spectra for volatile fluorocarbon gases, aiming to assist in understanding treatment processes and improving quantification. The spectra in the database are obtained through weighted averaging of multiple measurements, covering a wide range of infrared signatures. An application of the database is demonstrated for identifying and quantifying thermal decomposition products.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Nanoscience & Nanotechnology
Michael J. J. Wilhelm, Timothy J. J. Johnson, Tanya L. L. Myers
Summary: In this study, a method was developed to simulate the convoluted rotational contours in the gas-phase spectra of C-1 molecules by combining existing ab initio calculations with Colin Western's PGOPHER program. The simulated contours showed good agreement with the measured spectra from the Pacific Northwest National Laboratory infrared gas-phase database.
Article
Chemistry, Physical
Hui Fang, Michael J. Wilhelm, Danielle L. Kuhn, Zachary Zander, Hai-Lung Dai, George A. Petersson
Summary: The electronic and vibrational spectra of TSPP were computationally studied, showing good agreement with experimental measurements. In addition, an infrared absorption feature in the excited states was discovered and used to investigate the vibrational dynamics of the excited state.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jonathan M. Smith, Matthew Nikow, Michael J. Wilhelm, Hai-Lung Dai
Summary: In this study, the energy transfer mechanism of highly vibrationally excited acetylene during collisional relaxation is investigated using time-resolved Fourier transform infrared emission spectroscopy. The results show different energy transfer efficiencies of acetylene in different vibrational energy ranges.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Correction
Chemistry, Medicinal
Tong Wu, Michael J. Wilhelm, Yujie Li, Jianqiang Ma, Hai-Lung Dai
ACS INFECTIOUS DISEASES
(2023)
Article
Chemistry, Physical
Tanya L. Myers, Bruce E. Bernacki, Michael J. Wilhelm, Karissa L. Jensen, Timothy J. Johnson, Oliva M. Primera-Pedrozo, Russell G. Tonkyn, Steven C. Smith, Sarah D. Burton, Ashley M. Bradley
Summary: This paper investigates the accuracy of deriving the composite optical constants of binary mixtures and validates the results experimentally. The findings suggest that in miscible liquids where the average geometry of the cross-interactions can be considered isotropic, the refractive indices of the mixtures can be modeled using composite refractive indices derived from volume fractions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
