We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles.First,the ballistic transmission in the visible range of the suspension is mea...We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles.First,the ballistic transmission in the visible range of the suspension is measured.The nonlinear relationship is observed between the transport mean free path and the wavelength of the incident light.Secondly,we measure the coherent backscattering (CBS) of the sample at different wavelengths.The full width at half maximum of the CBS cone at 532 nm is about 1.24 times as large as that at 671 nm.The results indicate that the light with a long wavelength propagates further than the short wavelength light and the localization state of the short one is stronger.Finally,we investigate the light-controllable CBS experiments in the disordered materials of anisotropic scatterers,which show that the configuration of pump light with the longer wavelength and the probe light with the shorter wavelength performs better.展开更多
The photoluminescence spectrum of poly(ethylene terephthalate) (PET) excited by light with wavelength in the reign from 260 to 360?nm was investigated.When the excitation wavelength was shorter than 300?nm,it was obse...The photoluminescence spectrum of poly(ethylene terephthalate) (PET) excited by light with wavelength in the reign from 260 to 360?nm was investigated.When the excitation wavelength was shorter than 300?nm,it was observed that the profile and structure of the photoluminescence spectrum of PET did not change with the increase of the excitation wavelength. When the excitation wavelength was longer than 300 nm,the wavelength dependence of the spectrum was observed. Excited in the reign from 300 nm to the value that was a little larger than the maximum excitation wavelength, there was only one main peak at 367 nm in the photoluminescence spectrum. However, with the continued increasing of the excitation wavelength, another peak appeared at 387 nm and its intensity increased accompanying with the decrease of the intensity of the peak at 367 nm. At last, the peak at 387 nm became the main peak and the peak at 367 nm changed to the second main peak. It was suggested that the photoluminescence of 367 nm and 387 nm would rather come from the excimeric emission and the ground state dimmer, respectively, than origin from the same emitting center.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 10874093 and 10804055)the National Basic Research Program of China (Grant Nos. 2007CB307002 and 2010CB934101)+1 种基金the 111 Project (Grant No. B07013)the Program for NCET
文摘We experimentally study the wavelength dependence of light propagation in a water suspension of lithium niobate microcrystalline particles.First,the ballistic transmission in the visible range of the suspension is measured.The nonlinear relationship is observed between the transport mean free path and the wavelength of the incident light.Secondly,we measure the coherent backscattering (CBS) of the sample at different wavelengths.The full width at half maximum of the CBS cone at 532 nm is about 1.24 times as large as that at 671 nm.The results indicate that the light with a long wavelength propagates further than the short wavelength light and the localization state of the short one is stronger.Finally,we investigate the light-controllable CBS experiments in the disordered materials of anisotropic scatterers,which show that the configuration of pump light with the longer wavelength and the probe light with the shorter wavelength performs better.
文摘The photoluminescence spectrum of poly(ethylene terephthalate) (PET) excited by light with wavelength in the reign from 260 to 360?nm was investigated.When the excitation wavelength was shorter than 300?nm,it was observed that the profile and structure of the photoluminescence spectrum of PET did not change with the increase of the excitation wavelength. When the excitation wavelength was longer than 300 nm,the wavelength dependence of the spectrum was observed. Excited in the reign from 300 nm to the value that was a little larger than the maximum excitation wavelength, there was only one main peak at 367 nm in the photoluminescence spectrum. However, with the continued increasing of the excitation wavelength, another peak appeared at 387 nm and its intensity increased accompanying with the decrease of the intensity of the peak at 367 nm. At last, the peak at 387 nm became the main peak and the peak at 367 nm changed to the second main peak. It was suggested that the photoluminescence of 367 nm and 387 nm would rather come from the excimeric emission and the ground state dimmer, respectively, than origin from the same emitting center.
