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We report on the investigation and characterization of an optically tunable filtering effect, observed in a waveguide grating made of alternated strips of photocurable polymer and a mixture of azo-dye-doped liquid crystal. The grating is sandwiched between two borosilicate glasses, one of which includes an ion-exchanged channel waveguide, which confines the optical signal to be filtered. Exposure to a low power visible light beam modifies the azo-dye molecular configuration, thus allowing the filtered wavelength to be tuned over a 6.6 nm range. Simulations of the filtering response are well described with our experimental findings.
Optical Society of America
Publication date: 
15 Dec 2011

Giovanni Gilardi, Luciano De Sio, Romeo Beccherelli, Rita Asquini, Antonio d’Alessandro, Cesare Umeton

Biblio References: 
Volume: 36 Issue: 24 Pages: 4755-4757
Optics letters