Depolarization of Scattered Light by Optically Active Systems

1965 ◽  
Vol 69 (2) ◽  
pp. 689-691 ◽  
Author(s):  
P. F. Mijnlieff ◽  
H. Zeldenrust
Keyword(s):  
Scattered Light ◽  
Optically Active ◽  
Active Systems

Light Scattering from Fluctuations in an Optically Active Fluid

1973 ◽  
Vol 28 (6) ◽  
pp. 805-814
Author(s):  
Kin-Wah Li ◽  
John S. Dahler
Keyword(s):  
Light Scattering ◽  
Angular Dependence ◽  
Optical Activity ◽  
Scattered Light ◽  
Monochromatic Light ◽  
Optically Active ◽  
Scattering Medium ◽  
Irreducible Components ◽  
New Feature ◽  
Scattered Fields

The theory of light scattering by fluctuations has been extended to optically active fluids. The new feature is the "gyration parameter", a second rank asymmetric tensor, the fluctuations of which must be counted along with the familiar isotropic (scalar) and anisotropic (traceless and symmetric) fluctuations of the electric permeability tensor. Scattering equations are derived and solved in order to obtain the spectrum of scattered light. It is found that the angular dependence of scattering caused by fluctuations of permeability alone does not involve the propagation vectors of the incident or scattered fields whereas that which involves fluctuations of the gyration parameter depends explicitly upon these two vectors. This gyration tensor also has distinguishable effects upon the depolarization, ellipticity, and rotation or tilt of the scattered quasi-monochromatic light. The total intensity is resolved into a sum of five distinct contributions, each associated with different irreducible components of the gyration and permeability tensors and each with a different dependence upon the scattering angle and polarizations of the incident and scattered light. Experiments are suggested which emphasize effects originating from the optical activity of the scattering medium.

Synthesis & Characterization of Optically-Active Lanthanide-Doped Hybrid Inorganic-Organic Systems

1999 ◽  
Vol 576 ◽  
Author(s):  
R.E. Taylor-Smith ◽  
K. M. Choi
Keyword(s):  
Sol Gel ◽  
Systems Design ◽  
Optically Active ◽  
Materials Chemistry ◽  
Active Systems ◽  
Organic Systems ◽  
Bridged Silsesquioxane ◽  
Molecular Composites ◽  
Rare Earth Doped

ABSTRACTThe materials chemistry of sol-gel-derived inorganic-organic molecular composites offers significant potential for molecular-level systems design. One focus in this arena is the chemical design and microstructural engineering of optically-active systems. We report the generation of rare-earth-doped inorganic-organic hybrids, based on a bridged polysilsesquioxane architecture. Derived from lanthanide precursors such as Erbium isopropoxide, which we co-condense with the requisite silsesquioxane monomer, these systems exhibit significant optical activity. In experiments on hybrids doped with Erbium, we conclusively demonstrate strong fluorescence at wavelengths in the vicinity of 1540 nm, from stimulation with 488 nm radiation. We discuss materials-driven impacts of the bridged-silsesquioxane architecture on system complexities arising from the solution sol-gel route which would affect fluorescence efficiencies and luminescence levels, such as hydroxyl impurities and clustering-effects.

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