Optical absorption is investigated for asymmetric double quantum wells driven by a resonant terahertz field and a varied terahertz field,both polarized along the growth direction.Rich nonlinear dynamics of the replica...Optical absorption is investigated for asymmetric double quantum wells driven by a resonant terahertz field and a varied terahertz field,both polarized along the growth direction.Rich nonlinear dynamics of the replica peak and the Autler-Townes splitting of various dressed states are systematically studied in undoped asymmetric double quantum wells by taking account of multiple factors,such as the frequency of the varied terahertz field and the strength of the resonant terahertz field.Each electron subband splits into two dressed states when the resonant terahertz field is applied in the absence of the varied terahertz field,the optical absorption spectrum shows the first-order Autler-Townes splitting of the electron subbands.When a varied terahertz field is added into the resonant system,the replica peak and the second-order Autler-Townes splitting of the dressed states near the band edge respectively emerge when the varied terahertz field is non-resonant and resonant with these dressed states.When the strength of the resonant terahertz field is increased,the first-order Autler-Townes double peaks and the replica peak in the optical absorption spectrum shift with the shifts of the dressed states.The presented results have potential applications in electro-optical devices.展开更多
Salbutamol sulfate was coordinated with Cu2+ when pH was 10, and the characteristic absorption peak of the complex was generated at 334 nm. The absorption intensity of the complex was in linear relation with the conce...Salbutamol sulfate was coordinated with Cu2+ when pH was 10, and the characteristic absorption peak of the complex was generated at 334 nm. The absorption intensity of the complex was in linear relation with the concentration of salbutamol sulfate. The regression equation was A=0.011 ρsalbutamol sulfate-0.123 0, correlation coefficient r=0.999 5, and the detection limit was 4.6 μg/ml. It was used for the determination of salbutamol sulfate samples successfully. The recovery rate was 100.5%-103.0%, and the RSD was 1.5%.展开更多
We proposed a new approach to determination of Judd-Ofelt intensity parameters of Er^（3＋） doped phosphors via their absorption spectra. To validate this approach, JO parameters of Er^（3＋） doped Ba BaGd_2ZnO_5/PM...We proposed a new approach to determination of Judd-Ofelt intensity parameters of Er^（3＋） doped phosphors via their absorption spectra. To validate this approach, JO parameters of Er^（3＋） doped Ba BaGd_2ZnO_5/PMMA and NaYF_4/PMMA composites were calculated and in a good agreement with the other glass and crystal. The spontaneous radiative transition probability, branching ratio, and radiative lifetime of the optical transitions were calculated by using the Judd-Ofelt theory. Intense near-infrared emission at 1553 nm was observed under 980 nm laser diode excitation at room temperature. The samples possessing high full-width at half-maximum reach 85 nm have potential application in broadband optical amplifier.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 10647132)the Hunan Provincial Education Department Funded Project,China (Grant No. 10A100)
文摘Optical absorption is investigated for asymmetric double quantum wells driven by a resonant terahertz field and a varied terahertz field,both polarized along the growth direction.Rich nonlinear dynamics of the replica peak and the Autler-Townes splitting of various dressed states are systematically studied in undoped asymmetric double quantum wells by taking account of multiple factors,such as the frequency of the varied terahertz field and the strength of the resonant terahertz field.Each electron subband splits into two dressed states when the resonant terahertz field is applied in the absence of the varied terahertz field,the optical absorption spectrum shows the first-order Autler-Townes splitting of the electron subbands.When a varied terahertz field is added into the resonant system,the replica peak and the second-order Autler-Townes splitting of the dressed states near the band edge respectively emerge when the varied terahertz field is non-resonant and resonant with these dressed states.When the strength of the resonant terahertz field is increased,the first-order Autler-Townes double peaks and the replica peak in the optical absorption spectrum shift with the shifts of the dressed states.The presented results have potential applications in electro-optical devices.
基金Supported by School-level Project of Guangxi University of Chinese Medicine(YB140004)The 2017 Basic Ability Improving Project of Young and Middleaged Teachers by the Education Department of Guangxi(2017KY0284)
文摘Salbutamol sulfate was coordinated with Cu2+ when pH was 10, and the characteristic absorption peak of the complex was generated at 334 nm. The absorption intensity of the complex was in linear relation with the concentration of salbutamol sulfate. The regression equation was A=0.011 ρsalbutamol sulfate-0.123 0, correlation coefficient r=0.999 5, and the detection limit was 4.6 μg/ml. It was used for the determination of salbutamol sulfate samples successfully. The recovery rate was 100.5%-103.0%, and the RSD was 1.5%.
基金supported by the National Natural Science Foundation of China(11474083)Department of Education Fund of Hebei Province(ZD2014069)Natural Science Fund of Hebei Province(A2015201192)
文摘We proposed a new approach to determination of Judd-Ofelt intensity parameters of Er^（3＋） doped phosphors via their absorption spectra. To validate this approach, JO parameters of Er^（3＋） doped Ba BaGd_2ZnO_5/PMMA and NaYF_4/PMMA composites were calculated and in a good agreement with the other glass and crystal. The spontaneous radiative transition probability, branching ratio, and radiative lifetime of the optical transitions were calculated by using the Judd-Ofelt theory. Intense near-infrared emission at 1553 nm was observed under 980 nm laser diode excitation at room temperature. The samples possessing high full-width at half-maximum reach 85 nm have potential application in broadband optical amplifier.
