Dichroic materials

Cold mirror A reflector that is coated by a dichroic material that absorbs or passes wavelengths in the infrared region while reflecting those in the UV range. 

Circular birefringence will induce a differential retardation in the phase of the orthogonal states of circularly polarized light. Circular dichroism, on the other hand, results in anisotropic attenuation of left- and right-circularly polarized light. The Jones matrix of circularly dichroic materials is normally written as ... 

For a dilute suspension, this result can be compared with a weakly birefringent and dichroic material. In this case, from equations (2.15) and (2.21),... 

When the material is noncoaxial, the optical train in Figure 8.9 can still be used and provides sufficient information to solve for all four unknowns, An, An", 9, and 9". To demonstrate this capability, the analysis shall be worked out for the (P/RH)psG design. The Mueller matrix for a noncoaxial birefringent and dichroic material was developed in section 2.4.7 and is given by equation (1.18) with 8 = 8"c<- = 0 The intensities... 

It has been proposed that highly coloured metallomesogens could be of interest as dichroic materials. 

The dichroic material [AuiCl2][Au (HDMG)2] has been shown to stack with a short 3.26 A Au-Au bond distance (557). The crystal structure contains alternating cations and anions as well as alternating complexes containing metals in different oxidation states. The single crystal conductivity is less than 10-12 i2-icm i (398) and is consistent with the lack of strong metal-metal bonds. 

D. H. Song, H. Y. Yoo, and J. P. Kim, Synthesis of stilbene-based azo dyes and application for dichroic materials in poly(vinyl alcohol) polarizing films. Dyes and Pigments, 75, p. 727 (2007). 

Other examples that focus more on the optical aspects of nanocomposites include UV absorption stability enhancement, formation of translucent nanocomposites with tunable color, dichroic materials, low emissivity systems controlling energy loss, near-infrared absorbing additives for laser engraving and welding, luminescent materials, and refractive index adjrrst-ment. Such materials can be expected to show additional property improvements with additional research. 

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