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1 August 2007 Corrugated grating on organic multilayer Bragg reflector
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Proceedings Volume 6785, ROMOPTO 2006: Eighth Conference on Optics; 678517 (2007)
Event: ROMOPTO 2006: Eighth Conference on Optics, 2006, Sibiu, Romania
Polymeric multilayer Bragg structures are combined with diffractive gratings to produce artificial visual color effects. A particular effect is expected due to the angular reflection dependence of the multilayer Bragg structure and the dispersion caused by the grating. The combined effects can also be used to design particular filter functions and various resonant structures. The multilayer Bragg structure is fabricated by spin-coating of two different low-cost polymer materials in solution on a cleaned glass substrate. These polymers have a refractive index difference of about 0.15 and permit multilayer coatings without interlayer problems. Master gratings of different periods are realized by laser beam interference and replicated gratings are superimposed on the multilayer structure by soft embossing in a UV curing glue. The fabrication process requires only polymer materials. The obtained devices are stable and robust. Angular dependent reflection spectrums for the visible are measured. These results show that it is possible to obtain unexpected reflection effects. A rich variety of color spectra can be generated, which is not possible with a single grating. This can be explained by the coupling of transmission of grating orders and the Bragg reflection band. A simple model permits to explain some of the spectral vs angular dependence of reflected light.
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Sylvain Jaquet, Toralf Scharf, and Hans Peter Herzig "Corrugated grating on organic multilayer Bragg reflector", Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 678517 (1 August 2007);


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