High refractive index birefringent organic solid crystal and methods of making thereof

A method of making an optical film, the method comprising:

• obtaining an ampoule having one or more nucleation portions and a crystal growth portion coupled with the one or more nucleation portions, wherein the ampoule is filled with organic solid crystal source material;
• placing the ampoule inside a first space of a chamber thereby heating the organic solid crystal source material to a melting state, the first space having a first temperature, the chamber also having a second space with a second temperature, the first space and the second space being separated by a gate;
• and
• transferring the ampoule from the first space of the chamber to the second space of the chamber thereby recrystallizing the organic solid crystal source material to form a contiguous organic solid crystal film having a first dimension no less than 100 micrometers and a second dimension distinct from the first dimension no less than one centimeter.