Observation of tunable optical filtering in photosensitive composite structures containing liquid crystals
2011; Optica Publishing Group; Volume: 36; Issue: 24 Linguagem: Inglês
10.1364/ol.36.004755
ISSN1539-4794
AutoresGiovanni Gilardi, Luciano De Sio, Romeo Beccherelli, Rita Asquini, Antonio d’Alessandro, Cesare Umeton,
Tópico(s)Photonic Crystals and Applications
ResumoWe 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.
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