Although it has a significant advantage in gain properties,the lack of selective etching processes hinders ZnO lasing in on-chip applications.Herein,the circular ZnO microdisk pivoted on Si substrate is fabricated thr...Although it has a significant advantage in gain properties,the lack of selective etching processes hinders ZnO lasing in on-chip applications.Herein,the circular ZnO microdisk pivoted on Si substrate is fabricated through depositing ZnO on patterned silicon on an insulator(SOI)substrate.The cavity structure,morphology,and photoluminescence(PL)properties are studied systematically.The cavity shows a well-defined circular structure with oxygen vacancies.Under the synergistic action of surface tension and stress,the ZnO microdisk shows a unique toroid structure with a high sidewall surface finish.The ZnO microcavity(8μm in diameter)shows optically pumped whispering gallery modes(WGMs)lasing in the ultraviolet region with a Q factor exceeding 1300.More interestingly,the quality of the toroid ZnO microdisk cavity is high enough to support the bandgap renormalization(BGR)phenomenon.With the increasing pumping power,the lasing spectra will be modulated.The lasing spectrum undergoes a Burstein-Moss(BM)effect-induced blueshift and an electron-hole plasma(EHP)effect-induced redshift.展开更多
A poly(methyl methacrylate)-based capillary electrophoresis microchip, integrated with a microelectrode-based end-column amperometric detection, was described. A short unclosed portion of the separation channel from t...A poly(methyl methacrylate)-based capillary electrophoresis microchip, integrated with a microelectrode-based end-column amperometric detection, was described. A short unclosed portion of the separation channel from the detection cell was used as a working-electrode guide channel. With the aid of a three-dimension micropositioner and an optical microscope, a home-made 6 μm carbon-fiber microdisk electrode(tip diameter of 20 μm) was positioned along the guide channel at 30 μm distance from the channel outlet. With dopamine and catechol the as model analytes, the analytical performance of the system was demonstrated and the detection limit of 1.6×10 -7mol/L for dopamine was achieved, to our knowledge, which is the lowest value than that from published literatures using electrophoresis microchip with end-column amperometric detection.展开更多
The microdisk electrode voltammetric behaviors of C60 are reported in this communication. This was accomplished by use of a mixed solvent system as Acetonotrile:Xylene = 1: 4 and a supporting electrolyte as 0.1 mol...The microdisk electrode voltammetric behaviors of C60 are reported in this communication. This was accomplished by use of a mixed solvent system as Acetonotrile:Xylene = 1: 4 and a supporting electrolyte as 0.1 mol·L-1 Bu4NPF6. Au, Pt and Hg (Pt) were used as working electrode. In this new conditions, the successive six step reduction of C60 were obtained at below 15℃. It was found that the former five steps are all the single electron reversible reduction, but behaviors of the sixth steps are like EC’ processes.Several electrochemical data were determined.展开更多
利用反应离子刻蚀 ( RIE)和湿法腐蚀方法在 In Ga As/ In Ga As P多量子阱材料上研制出直径为 8μm、4 .5μm和 2 μm的碟型半导体微腔激光器。其中 2 μm直径的微碟在液氮温度下其光泵浦激射阈值仅为 3 μW左右。对高光功率密度下泵浦...利用反应离子刻蚀 ( RIE)和湿法腐蚀方法在 In Ga As/ In Ga As P多量子阱材料上研制出直径为 8μm、4 .5μm和 2 μm的碟型半导体微腔激光器。其中 2 μm直径的微碟在液氮温度下其光泵浦激射阈值仅为 3 μW左右。对高光功率密度下泵浦时出现的多模激射、跳模和激射光谱强度饱和现象进行了研究。展开更多
文摘Although it has a significant advantage in gain properties,the lack of selective etching processes hinders ZnO lasing in on-chip applications.Herein,the circular ZnO microdisk pivoted on Si substrate is fabricated through depositing ZnO on patterned silicon on an insulator(SOI)substrate.The cavity structure,morphology,and photoluminescence(PL)properties are studied systematically.The cavity shows a well-defined circular structure with oxygen vacancies.Under the synergistic action of surface tension and stress,the ZnO microdisk shows a unique toroid structure with a high sidewall surface finish.The ZnO microcavity(8μm in diameter)shows optically pumped whispering gallery modes(WGMs)lasing in the ultraviolet region with a Q factor exceeding 1300.More interestingly,the quality of the toroid ZnO microdisk cavity is high enough to support the bandgap renormalization(BGR)phenomenon.With the increasing pumping power,the lasing spectra will be modulated.The lasing spectrum undergoes a Burstein-Moss(BM)effect-induced blueshift and an electron-hole plasma(EHP)effect-induced redshift.
文摘A poly(methyl methacrylate)-based capillary electrophoresis microchip, integrated with a microelectrode-based end-column amperometric detection, was described. A short unclosed portion of the separation channel from the detection cell was used as a working-electrode guide channel. With the aid of a three-dimension micropositioner and an optical microscope, a home-made 6 μm carbon-fiber microdisk electrode(tip diameter of 20 μm) was positioned along the guide channel at 30 μm distance from the channel outlet. With dopamine and catechol the as model analytes, the analytical performance of the system was demonstrated and the detection limit of 1.6×10 -7mol/L for dopamine was achieved, to our knowledge, which is the lowest value than that from published literatures using electrophoresis microchip with end-column amperometric detection.
文摘The microdisk electrode voltammetric behaviors of C60 are reported in this communication. This was accomplished by use of a mixed solvent system as Acetonotrile:Xylene = 1: 4 and a supporting electrolyte as 0.1 mol·L-1 Bu4NPF6. Au, Pt and Hg (Pt) were used as working electrode. In this new conditions, the successive six step reduction of C60 were obtained at below 15℃. It was found that the former five steps are all the single electron reversible reduction, but behaviors of the sixth steps are like EC’ processes.Several electrochemical data were determined.
文摘利用反应离子刻蚀 ( RIE)和湿法腐蚀方法在 In Ga As/ In Ga As P多量子阱材料上研制出直径为 8μm、4 .5μm和 2 μm的碟型半导体微腔激光器。其中 2 μm直径的微碟在液氮温度下其光泵浦激射阈值仅为 3 μW左右。对高光功率密度下泵浦时出现的多模激射、跳模和激射光谱强度饱和现象进行了研究。
