We investigate the mechanisms to realize the Raman laser switching in a silica rod microresonator with mode-interactionassisted excitation.The laser switching can be triggered between two whispering gallery modes[WGMs...We investigate the mechanisms to realize the Raman laser switching in a silica rod microresonator with mode-interactionassisted excitation.The laser switching can be triggered between two whispering gallery modes[WGMs]with either the same or distinct mode families,depending on the pumping conditions.The experimental observations are in excellent agreement with a theoretical analysis based on coupled-mode equations with intermodal interaction terms involved.Additionally,we also demonstrate switching of a single-mode Raman laser and a wideband spectral tuning range up to~32.67 nm by selective excitation of distinct mode sequences.The results contribute to the understanding of Raman lasing formation dynamics via interaction with transverse mode sequences and may extend the microcavity-based Raman microlasers to potential areas in switchable light sources,optical memories,and high sensitivity sensors.展开更多
Zinc and its alloys provide a scalable alternative to the list of biodegradable metals due to its moderate degradation rates and biocompatible degradation products.However,one of the challenges impeding their clinical...Zinc and its alloys provide a scalable alternative to the list of biodegradable metals due to its moderate degradation rates and biocompatible degradation products.However,one of the challenges impeding their clinical applications is the uncontrollable and unstable interfacial reactions between zinc implants and the corrosive media.In this study,we report a facile synthesis of metal-organic framework(MOF)nanocrystal coating with tunable thickness on the high-strength Zn-0.8Li alloy matrix for controlled corrosion.The as-obtained dense and uniform MOF nanocrystals form a strong connection with the zinc matrix via coordination bond so as to maintain the mechanical properties,and meantime provide highly rough surfaces exhibiting tunable wettability.The varied MOF coating thus regulate the interface structure between the zinc matrix and corrosive media to control the degradation behavior.Excellent antibacterial activity and biocompatibility are also achieved because of the unique topology morphologies,surface superhydrophilicity,as well as the dynamic Zn^(2+)release.This study sheds valuable lights on the design of MOF-functionalized metal implants for practical use and also triggers extensive applications of MOF in biomaterials.展开更多
基金financially supported by the National Natural Science Foundation of China(52371248)National Key R&D Program of China(2021YFB3802200)+5 种基金Guangdong Basic and Applied Basic Research Foundation(2023A1515010905)he Scientific and Technological Innovation Foundation of Shunde Graduate School,USTB(BK22BE012)the funding supports from Singapore Ministry of Education(AcRF Tier 1 RS13/20 and RG4/21)A*STAR Singapore(AME YIRG A2084c0158)the Center of Hydrogen Innovation,National University of Singapore(CHI-P2022-05)Nanyang Technological University Startup Grants。
基金supported by the National Natural Science Foundation of China(No.62005071)the Natural Science Foundation of Anhui Province(No.2008085QF312)+1 种基金the Fundamental Research Funds for the Central Universities(No.JZ2021HGTB0079)the National Key Research and Development Program of China(No.2019YFE010747)。
文摘We investigate the mechanisms to realize the Raman laser switching in a silica rod microresonator with mode-interactionassisted excitation.The laser switching can be triggered between two whispering gallery modes[WGMs]with either the same or distinct mode families,depending on the pumping conditions.The experimental observations are in excellent agreement with a theoretical analysis based on coupled-mode equations with intermodal interaction terms involved.Additionally,we also demonstrate switching of a single-mode Raman laser and a wideband spectral tuning range up to~32.67 nm by selective excitation of distinct mode sequences.The results contribute to the understanding of Raman lasing formation dynamics via interaction with transverse mode sequences and may extend the microcavity-based Raman microlasers to potential areas in switchable light sources,optical memories,and high sensitivity sensors.
基金financially supported by the National Natural Science Foundation of China(52371248,52373273)National Key R&D Program of China(2021YFB3802200)+1 种基金Guangdong Basic and Applied Basic Research Foundation(2023A1515010905)Fundamental Research Funds for the Central Universities(FRF-EYIT-23-05)。
文摘Zinc and its alloys provide a scalable alternative to the list of biodegradable metals due to its moderate degradation rates and biocompatible degradation products.However,one of the challenges impeding their clinical applications is the uncontrollable and unstable interfacial reactions between zinc implants and the corrosive media.In this study,we report a facile synthesis of metal-organic framework(MOF)nanocrystal coating with tunable thickness on the high-strength Zn-0.8Li alloy matrix for controlled corrosion.The as-obtained dense and uniform MOF nanocrystals form a strong connection with the zinc matrix via coordination bond so as to maintain the mechanical properties,and meantime provide highly rough surfaces exhibiting tunable wettability.The varied MOF coating thus regulate the interface structure between the zinc matrix and corrosive media to control the degradation behavior.Excellent antibacterial activity and biocompatibility are also achieved because of the unique topology morphologies,surface superhydrophilicity,as well as the dynamic Zn^(2+)release.This study sheds valuable lights on the design of MOF-functionalized metal implants for practical use and also triggers extensive applications of MOF in biomaterials.
