Multilayer optical film with nanoparticles

Abstract

Multilayer optical films, including but not limited to p-polarizing films, have alternating optical layers at least some of which contain nanoparticles in an amount sufficient to enhance the refractive indices of the optical layers.

1 . A multilayer optical film, comprising: 
 a plurality of alternating first and second optical layers of differing refractive index;    wherein at least one of the first and second layers contains nanoparticles present in an amount sufficient to enhance a refractive index thereof.    
   
   
       2 . The film of  claim 1 , wherein the first layers contain said nanoparticles and the first layers are isotropic.  
   
   
       3 . The film of  claim 2 , wherein the second layers are birefringent.  
   
   
       4 . The film of  claim 2 , wherein the second layers are isotropic.  
   
   
       5 . The film of  claim 1 , wherein said nanoparticles include titania particles.  
   
   
       6 . The film of  claim 1 , wherein said nanoparticles include zirconia particles.  
   
   
       7 . The film of  claim 1 , wherein said nanoparticles are present in an amount of 15 weight percent or greater.  
   
   
       8 . The film of  claim 1 , wherein the nanoparticles include a surface treatment.