Inorganic materials have the lowest optical loss

Sep 7, 2018

Optical properties

In recent years, the optical properties ofthe polyimide has attracted much attention. This is also due to the highthermal stability of polyimide, and engage in mechanical properties, ease ofprocessing and structural characteristics due to easy cut. The so-calledoptical properties of a wide range, mainly refers to the transparent, specificrefractive index, specific birefringent, nonlinear optical properties,electroluminescent or light-to-luminescent properties. For the latter two,polyimide mainly serving as a support group related functions. Polyimidestructure itself functional relationship does not play a decisive role.However, these functions can maintain stability at higher temperatures. As forthe photosensitive polyimide is a class action under the rays of light orpartial introduction of the photosensitive polymer chain reaction. Afterdevelopment, the specific pattern obtained after the fixing, and thenheat-treated to obtain a stable polyimide pattern of the polyimide precursor.

So far, the material for the transparentinorganic remains limited and general transparent polymer material. Such aspolymethyl methacrylate, polystyrene, polycarbonate, and the like. Inorganicmaterial optical loss minimum, glass fiber for long-distance transmission wavelengthof 1310nm and 1550nm optical signal. Organic material loss at the wavelength ofthe much larger, but due to tough than glass and are increasingly being usedfor short and medium-distance connections. One disadvantage of such materialsare sensitive to temperature, even at moderate temperatures, thermal stress canlead to local changes in the refractive index. Low glass transition temperatureis more deformable material will occur, resulting in damage to the structure ofthe optical device.