Patent attributes
An optical material can be formed by creating extremely small voids or gas-filled bubbles in a polymeric material, such as a thermoplastic or a fluoropolymer. The voids or gas-filled bubbles can reduce the refractive index of the optical material substantially below the polymeric material's refractive index. Dimensionally, the voids or gas-filled bubbles can be smaller than the wavelength of light that is intended to interact with the optical material, thereby avoiding undue scattering loss. The voids or gas-filled bubbles can be formed via adding particles of gas-generating material to the polymeric material and heating the resulting composition. The voids or gas-filled bubbles can form as the heat causes the polymeric material to melt and the particles to generate gas. The optical material can be utilized as a cladding to provide a high numerical aperture optical fiber, for example.
