Authors: M. Dubov, V. Mezentsev and I. Bennion
Affilation: Aston University, United Kingdom
Pages: 229 - 232
Keywords: femtosecond inscription, photonic nanostructures, Bragg grating
The fabrication of sub-micron periodic structures beyond diffraction limit is a major motivation for the present paper. We describe the fabrication of the periodic structure of 25 mm long with a pitch size of 260nm which is less than a third of the wavelength used. This is the smallest reported period of the periodic structure inscribed by direct point-by-point method. A prototype of the add-drop filter, which utilizes such FOBG, was demonstrated in one stage fabrication process of femtosecond inscription in the bulk fused silica.