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The study was selected as the cover issue.   Second-harmonic generation of 2D Janus MoSSe/MoS2 hetero-bilayers is optimized by stacking order and strain. (Credit: Nguyen Tuan Hung et al.) Janus Transition Metal Dichalcogenides (TMDs) are a specific class of two-dimensional (2D) materials, typically composed of a transition metal (such as molybdenum or tungsten) sandwiched between two chalcogen elements (such as sulfur, selenium, or tellurium). Named after the Roman god Janus, who had two faces looking in opposite directions, Janus TMDs do not have inversion symmetry between two surfaces of thin material. This built-in asymmetry makes Janus-TMD materials suitable for SHG, particularly when the two TMDs are hetero-stacked.   SHG is a nonlinear optical process in which two photons with the same frequency (ω) interact nonlinearly with the material, and as a result, a single photon with twice the frequency (2ω) (or half wavelength) is generated. Basically, it is a phenomenon where incoming light is converted into light with double the frequency or half wavelength.   SHG is important in various applications, including laser technology, microscopy, medical science and the solid state physics. SHG is used to generate light with shorter wavelengths, which can be valuable in fields like semiconductor lithography equipment and medical application as imaging technique that does not use fluorescent materials.   “Our team of researchers studied the optimized conditions of SHG in heterobilayers of the 2D Janus-TMD materials,” points out Nguyen Tan Hung, assistant professor of Frontier Institute for Interdisciplinary Science (FRIS), Tohoku University. “Specifically, we found that AA stacking, in which atoms in top layer directly overlap atoms in the bottom layer, and AB stacking, in which atoms in top layer do not directly overlap atoms in the bottom layer, resulted in a threefold enhancement of the former in the nonlinear optical response of the SHG.” This theoretical prediction agreed with the fact that the SHG peak intensity is four times larger for AA stacking than for AB stacking in the experiment.   “Thus, we have suggested that SHG intensity is also a useful way to determine how the layers of 2D materials are stacked,” said Nguyen. In addition, the researchers suggest that adding lateral strain (up to 20%) to these materials can further increase the light intensity significantly."   “Our research introduces a new category of materials that produce SHG, and we can make them in a flexible way using 2D materials,” adds Nguyen.   In addition to Nguyen, other participants include Professor Emeritus Riichiro Saito of Tohoku University, Professor Shengxi Huang and her group at Rice University in the United States, and Professor Jing Kong and her group at MIT. Publication Details Title: Nonlinear Optical Responses of Janus MoSSe/MoS2 Heterobilayers Optimized by Stacking Order and Strain     Authors: Nguyen Tuan Hung, Kunyan Zhang, Vuong Van Thanh, Yunfan Guo, Alexander A. Puretzky, David B. Geohegan, Jing Kong, Shengxi Huang, and Riichiro Saito Journal: ACS Nano DOI: https://doi.org/10.1021/acsnano.3c04436     Press Release: Tohoku University https://www.tohoku.ac.jp/en/press/stacking_order_strain_boosts_second_harmonic_generation.html Graduate School of Science, Tohoku University https://www.sci.tohoku.ac.jp/english/news/20230926-12879.html PAGE TOP Frontier Research Institute for Interdisciplinary Sciences About FRIS GreetingsOverviewMissionsOrganizationTenure track system in FRISMaps & DirectionsPublicationAnnual MeetingConsultation Desk Researcher Advanced Interdisciplinary Research DivisionCreative Interdisciplinary Research DivisionManaging & Planning DivisionEndowed Research DivisionsSenior-advisorVisiting Professors / Collaborative ResearchersSpecially-appointedOne-time members Feature TopicsFRIS InterviewsFRIS Hub Meeting Research Programs Open Research ProposalResearch Projects Recruit Open Staff PositionsHandbook for International Researchers FRIS CoRE FRIS CoRE FRIS Fund FRIS Fund for Early-Career Independent Researchers External Links for Early Career Researcher Support Division for Interdisciplinary Advanced Research and Education (DIARE) Ensemble Project for Early Career Researchers Support Program for the Article Processing Charge webmail LINK Copyrights © Frontier Research Institute for Interdisciplinary Sciences, Tohoku University All rights reserved. no cache