Abstract
This paper presents a new method to control of transmittance of glass by using nano plastic forming technique. Periodic arrays of sub-wavelength grooves were fabricated on glass by indenting a knife-edge type diamond tool. Groove depth was varied from 80nm to 120nm and the periodicity of grooves was varied from 250nm to 5μm. Relationship between transmittance against wavelength of light was measured by spectrometry. Results show that optical transmittance increases with the increase of the groove depth, and periodicity of grooves affects the range of wavelength where transmittance changes critically. It is explained by variation of effective refractive index due to the geometry of the groove structure. Results also show that transmittance by optimizing groove structures is higher than flat glass plate.
