.1 / 4 Department Of Asymmetric Membrane Polarization Splitters Developed

Polarization Beam Splitter(PBS) is an important optical devices, widely used in optical instruments, laser, photoelectric display devices and optical storage fields, etc. Traditional PBS made from natural birefringent crystals calcite, such as Semarmont prism, Rochon prism, Wollaston prism, splitting Glan-Thompson prism and Savart polarizer, etc. This crystal PBS have a good extinction ratios characteristics, the larger field of view angle(FOV) and a broad spectral bandwidth. Calcite crystals are very scarce and the size of small, artificial growth of crystals only can grow to several millimeters, can not satisfy the requirements of produce polarizer, which causes higher prices of natural crystal polarizer can not manufacture large-diameter prism, limiting the use of crystal polarizer. Other methods to manufacture PBS include use of optical thin film interference, or manufacture a birefringent optical film, utilize the metal wire grid diffraction, photonic crystal of negative refraction and Bragg grating waveguide. The most commonly used thin film PBS is a MacNeille type, this type have conducted extensive research at home and abroad.However, MacNeille type thin film PBS in the smaller FOV has brought a lot of inconvenience, especially in the flat panel display and projection devices, require a larger FOV, MacNeille type thin film PBS can not meet the requirements. Li and J.A.Dobrowolski reports a new type thin film PBS based on the principle of frustrated total reflection, with a very wide spectral bandwidth and a larger FOV, but the film layers is not one quarter structured, and the thickness is very thin, so difficult to accurately control, manufacture is difficult.In this paper, use the symmetric film system equivalent film theory and the cut-off theory, study the s, p polarization cut-off characteristics of symmetric film system when the tilt incidence; take advantage of the split features, designed the one quarter structured thin film PBS; Explored the deposition parameters and package techology of the PBS; Using Shimadzu UV3101-PC spectrophotometer and built extinction ratio test system, tested the two kinds of thin film polarization spectroscopic characteristics, proove it is entirely feasible to utilize tilt incidence symmetric film system s, p polarization equivalent refractive cut-off split to design thin film PBS, provides a new way for design and produce high performance, simple process thin film PBS.The full text mainly includes five chapters given as follows.In the first chapter, we introduce the development history of of thin film PBS and give an overview of current study, and the main contents of this paper.In the second chapter, introduced the basic principles of optical thin film and the symmetry equivalent film theory and the cut-off band theory. From the equivalent film theory and polarized light theory, studied the the s, p polarization's equivalent refractive index cut-off band split characteristic of symmetric film system when tilt incidence.In the third chapter, utilize the symmetric film system s, p polarization equivalent refractive index cut-off band split characteristics when title incidence split designed the one quarter structured thin film PBS and large FOV PBS, used thin film software TFCalc simulated polarization spectroscopic properties of the PBS.In the fouth chapter, mainly introduced the PBS's film processe and package processes. In order to achieve the theory desired effect, we explored the film deposition process parameters; We manufactured the PBS thin film by Korean EB900 vacuum coating machine; by compared testing determined the assembly process of the PBS.In the five chapter, use of spectrophotometers and built extinction ratios test system, the PBS's transmittance, extinction ratios and FOV characteristics were tested, and made a theoretical error analysis of the test, the experiment results consistent with the theoretical design, this film PBS have a excellent performance.