In a double-well system, we investigate theoretically the population distribution of a particle perturbed by a weak sinusoidal signal with a Gaussian white noise accompanied. Our numerical simulation shows that the pr...In a double-well system, we investigate theoretically the population distribution of a particle perturbed by a weak sinusoidal signal with a Gaussian white noise accompanied. Our numerical simulation shows that the probability of the particle staying in the right potential well, Pn, exhibits an extreme value at specific noise intensity D depending on the frequency of the sinusoidal signal, which is a key feature of stochastic resonance. This is confirmed by calculating the power spectrum of the output signal, in which the extreme value of the amplitude locates at the same noise intensity. These results provide us with a new way to quantify the stochastic resonance by measuring the population distribution of the particle.展开更多
We experimentally investigate the resonant and nonresonant second-harmonic generation in a single cadmium sulfide（Cd S） nanowire. The second-order susceptibility tensor is determined by analyzing the forward secondh...We experimentally investigate the resonant and nonresonant second-harmonic generation in a single cadmium sulfide（Cd S） nanowire. The second-order susceptibility tensor is determined by analyzing the forward secondharmonic signals of the Cd S nanowire. Our results show that（1） d33∕d31=-2.5 at a nonresonant input wavelength of 1050 nm;（2） d33∕d31=-1.9 at a resonant wavelength of 740 nm. The difference can be attributed to the polarization-dependent resonance.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2011CB922104 and 2011CBA00202the National Natural Science Foundation of China under Grant No 11474154+4 种基金the Natural Science Foundation of Jiangsu Province under Grant No BK2012013the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20120091110030the Dengfeng Project B of Nanjing UniversityJiangsu Key Laboratory of Advanced Manipulating Techniques of Electromagnetic Wavesthe Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘In a double-well system, we investigate theoretically the population distribution of a particle perturbed by a weak sinusoidal signal with a Gaussian white noise accompanied. Our numerical simulation shows that the probability of the particle staying in the right potential well, Pn, exhibits an extreme value at specific noise intensity D depending on the frequency of the sinusoidal signal, which is a key feature of stochastic resonance. This is confirmed by calculating the power spectrum of the output signal, in which the extreme value of the amplitude locates at the same noise intensity. These results provide us with a new way to quantify the stochastic resonance by measuring the population distribution of the particle.
基金supported by the National Science Foundation of China(Nos.91636106 and 11621091)the National Basic Research Program of China(No.2016YFA0302500)
文摘We experimentally investigate the resonant and nonresonant second-harmonic generation in a single cadmium sulfide（Cd S） nanowire. The second-order susceptibility tensor is determined by analyzing the forward secondharmonic signals of the Cd S nanowire. Our results show that（1） d33∕d31=-2.5 at a nonresonant input wavelength of 1050 nm;（2） d33∕d31=-1.9 at a resonant wavelength of 740 nm. The difference can be attributed to the polarization-dependent resonance.
