Circular intensity differential scattering of light by helical structures. I. Theory
Circular intensity differential scattering of light by helical structures. I. Theory
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螺旋结构对光的圆形强度差异散射。
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
I. Tinoco
中科院分区：
文献类型：
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作者：
C. Bustamante;M. Maestre;I. Tinoco
得到了螺旋结构散射电磁辐射的场和强度的一般表达式，螺旋结构的光学性质用沿螺旋切线的单轴极化率来描述。导出了圆散射强度差（CIDS）随螺旋参数和光波长的函数解析表达式。证明了左右圆偏振光存在微分散射的充分条件是不对称极化率的存在。发现单轴极化率的选择可以产生CIDS。对于入射平面偏振光，发现散射场一般是椭圆偏振的。导出了描述散射辐射偏振状态的Stokes参数。这些结果有望作为表征大分子结构中手性区域的新方法以及描述光散射过程的新方法。
General expressions for the fields and intensities of scattered electromagnetic radiation by helical structures whose optical properties are described by a uniaxial polarizability along the tangent to the helix are obtained. Analytical expressions for the circular intensity differential of scattering (CIDS) as a function of the helix parameters and the wavelength of light are derived. It is shown that a sufficient condition for the existence of differential scattering for right and left circularly polarized light is the existence of an asymmetric polarizability. The choice of a uniaxial polarizability is found to give rise to form CIDS. For incident plane‐polarized light, the scattered fields are found to be generally elliptically polarized. The Stokes parameters describing the state of polarization of the scattered radiation are derived. These results are expected to be relevant both as a new method to characterize chiral regions in macromolecular structures as well as to describe the light scattering pr...