The hole-burning in the excitonic spectra of polydiacetylene toluene sulfonate under subresonant optical excitation is investigated. Through calculating the nonlinear absorption spectra, the position and depth of the ...The hole-burning in the excitonic spectra of polydiacetylene toluene sulfonate under subresonant optical excitation is investigated. Through calculating the nonlinear absorption spectra, the position and depth of the hole are determined based on the phonon-mediated optical Stark effect. The comparison between measured data and theoretical results is made.展开更多
The two-photon absorption process has been investigated on polydiacetylene-toluene sulfonate.The two-photon absorption coefficient has been derived within tight-binding approximation and its numerical calculation has ...The two-photon absorption process has been investigated on polydiacetylene-toluene sulfonate.The two-photon absorption coefficient has been derived within tight-binding approximation and its numerical calculation has been carried out The results are discussed in terms of quasi-one-diinensional excitons on the polymer backbones.展开更多
Linear modes around a polaron in the quasi-one-dimensional iialogezi-bridged mixed-valence platinum compounds is studied using quasi-harmonic approximation,The additional modes,i. e.,so-called localised mode and local...Linear modes around a polaron in the quasi-one-dimensional iialogezi-bridged mixed-valence platinum compounds is studied using quasi-harmonic approximation,The additional modes,i. e.,so-called localised mode and localized bending mode are calculated numerically.展开更多
A simple model is used to evaluate the phonon frequencies in both ground and excited state for polydiacetylene.The spring constants K_(i)^(σ) in theσ-bond akeleton are distinct from the experinental effective spring...A simple model is used to evaluate the phonon frequencies in both ground and excited state for polydiacetylene.The spring constants K_(i)^(σ) in theσ-bond akeleton are distinct from the experinental effective spring constants K_(i).The results are compared with experimental data.展开更多
In this paper,the nonlinear optical absorption under two input optical waves is investigated.The nonlinear absorption coefficient is derived,and numerical results are calculated,which agree with experimental results.
The effect of impurity-induced interchain coupling on polaron in halogen-bridged mixed-valence plattinum complexes(HMPGs)[Pt(en)_(2)][Pt(en)_(2)X_(2)](ClO_(4))_(4) are studied by means of the lakayama,Lin-liu and Maki...The effect of impurity-induced interchain coupling on polaron in halogen-bridged mixed-valence plattinum complexes(HMPGs)[Pt(en)_(2)][Pt(en)_(2)X_(2)](ClO_(4))_(4) are studied by means of the lakayama,Lin-liu and Maki continuum model.The Greenfs function is used to calculate the change of polaronic bind-ing energy due to existing impurity.The results were supported by halogen doping experiment in HMPC's.展开更多
Based on an equivalent resistance-capacitance network, the complex conductivity and the relative complex permittivity of single wall carbon nanotubes (SWNTs)/polymer composite are theoretically investigated in the fre...Based on an equivalent resistance-capacitance network, the complex conductivity and the relative complex permittivity of single wall carbon nanotubes (SWNTs)/polymer composite are theoretically investigated in the frequency range of 0.30-18 GHz using the logarithmic rule. Both the real and imaginary parts of the permittivities of SWNTs and polymer are considered in detail. The calculated complex permittivity spectra of SWNTs/poly(ethyl methacrylate) composite films are in good agreement with the available experimental data. The influences of SWNTs concentration on both the complex conductivity and the dielectric loss tangent of the composite are presented in the microwave frequency range. A linear relationship between microwave conductivity and frequency is found.展开更多
文摘The hole-burning in the excitonic spectra of polydiacetylene toluene sulfonate under subresonant optical excitation is investigated. Through calculating the nonlinear absorption spectra, the position and depth of the hole are determined based on the phonon-mediated optical Stark effect. The comparison between measured data and theoretical results is made.
基金Supported by the Natural Science Foundation of Hu'nan Province.
文摘The two-photon absorption process has been investigated on polydiacetylene-toluene sulfonate.The two-photon absorption coefficient has been derived within tight-binding approximation and its numerical calculation has been carried out The results are discussed in terms of quasi-one-diinensional excitons on the polymer backbones.
基金Supported by the National Natural Science Foundation of China.
文摘Linear modes around a polaron in the quasi-one-dimensional iialogezi-bridged mixed-valence platinum compounds is studied using quasi-harmonic approximation,The additional modes,i. e.,so-called localised mode and localized bending mode are calculated numerically.
基金Supported by the National Natural Science Foundation of China。
文摘A simple model is used to evaluate the phonon frequencies in both ground and excited state for polydiacetylene.The spring constants K_(i)^(σ) in theσ-bond akeleton are distinct from the experinental effective spring constants K_(i).The results are compared with experimental data.
文摘In this paper,the nonlinear optical absorption under two input optical waves is investigated.The nonlinear absorption coefficient is derived,and numerical results are calculated,which agree with experimental results.
基金Supported by the National Natural Science Foundation of China.
文摘The effect of impurity-induced interchain coupling on polaron in halogen-bridged mixed-valence plattinum complexes(HMPGs)[Pt(en)_(2)][Pt(en)_(2)X_(2)](ClO_(4))_(4) are studied by means of the lakayama,Lin-liu and Maki continuum model.The Greenfs function is used to calculate the change of polaronic bind-ing energy due to existing impurity.The results were supported by halogen doping experiment in HMPC's.
基金the Science Research Program of Educational Department of Hunan Province of China (Grant No. 07C640)the Doctor Foundation of China (Grant No. 20030532008)
文摘Based on an equivalent resistance-capacitance network, the complex conductivity and the relative complex permittivity of single wall carbon nanotubes (SWNTs)/polymer composite are theoretically investigated in the frequency range of 0.30-18 GHz using the logarithmic rule. Both the real and imaginary parts of the permittivities of SWNTs and polymer are considered in detail. The calculated complex permittivity spectra of SWNTs/poly(ethyl methacrylate) composite films are in good agreement with the available experimental data. The influences of SWNTs concentration on both the complex conductivity and the dielectric loss tangent of the composite are presented in the microwave frequency range. A linear relationship between microwave conductivity and frequency is found.
