And also the refractive index of the dielectric material is closely related to arrangement of ions, isotropic material, such as when an amorphous (amorphous body) and cubic crystals, there is only one index of refraction. And when the light enters the inhomogeneous media, the general direction of vibration perpendicular to each other to be divided, ranging from two-wave propagation velocity of propylene glycol market prices, they were two refracted light glycol, a so-called birefringence. These two refracted light, the refractive index parallel to the plane of incidence of light, the refractive index of the light often referred to as high-quality propylene glycol, regardless of how the incident angle of incident light changes, it is always a constant, obey the law of refraction. Another refractive index perpendicular to the light incident surface constituted, with the direction of incident light changes, called extraordinary light refractive index, it does not comply with the law of refraction. When the incident light along the optical axis of the crystal, only exists with the optical axis perpendicular to the incident, up to the maximum value of the characteristics of this material. In summary, the crystal along the direction of greater bulk density greater extent. In addition, due to the Bragg mechanism of non-locality, incompleteness its periodic structures (such as the existence of structural disorder and defects) are more sensitive. In contrast with the Bragg mechanism, local resonance mechanism does not require periodic structure of the lattice constants to be comparable to the wavelength of the electromagnetic wave energy gap, and is not sensitive to the disorder and defects. But some of the key issues currently on the use of local people resonance mechanism designed not know enough negative refractive index materials, such as how to increase the negative refraction passband bandwidth, reducing wear and tear. Another proposed method for the preparation of specific material, the method utilizing the microwave transmission line periodically loaded lumped inductance - capacitance of the resonating unit to achieve effective negative refractive index. The slit ring resonator array structure compared to Smith et al., Periodically lumped inductance - capacitance resonant structure not only has a smaller loss and a wider bandwidth negative refraction, and easy to implement field regulation. Propylene glycol uses, Anhui glycol, Xiang dry chemical (View) by Andrew dry Jinan Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) is a professional, "glycol" company. Since its inception, we adhere to the "good faith, sound management" approach, the courage to participate in healthy competition in the market, so that the "chemical universe" brand has a good reputation. We adhere to the "service first, customers first" principle, so that the dry chemical Xiang won the trust of customers in alcohol in public, establish a good corporate image. Special Note: This information is for reference pictures and information, please contact us to obtain the most accurate information, thank you! You can also access (www.dilunyierchun.com/supply_details_44895670.html), for more information about the company.