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Journal of Nanomaterials
Volume 2012, Article ID 186429, 5 pages
Research Article

Bragg Grating Optical Filters by UV Nanoimprinting

1Department of Physics, University of Rome—Tor Vergata and Istituto Nazionale Scienze e Tecnologie dei Material (INSTM), Via della Ricerca Scientifica, 1-00133 Rome, Italy
2Department of Energetics, University of Rome—la Sapienza, and CNISM, Via A. Scarpa 16, 00161 Rome, Italy
3CNR-IFN, Institute for Photonics and Nanotechnologies, Via Cineto Romano, 00156 Rome, Italy

Received 22 November 2011; Accepted 28 December 2011

Academic Editor: Sevan P. Davtyan

Copyright © 2012 M. Casalboni et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Results on an optical waveguide filter operating in the near IR region are reported. The device consists of a hybrid sol-gel -based grating loaded waveguide, obtained through the merging of conventional photolithography and UV-nanoimprinting. Starting from submicrometric gratings, fabricated by electron beam lithography, a soft mould has been produced and the original structures were replicated onto sol-gel photosensitive films. A final photolithographic step allowed the production of grating-loaded channel waveguides. The devices were optically characterized by transmission measurements in the telecom range 1450–1590 nm. The filter extinction ratio is −11 dB and the bandwidth is 1.7 nm.