9 December 2004 Holographic recording of 2D photonic crystals in photosensitized PMMA
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Volume phase hologography is used for the recording of refractive index patterns with the symmetry of a photonic crystal. As a recording material solid plates of PMMA, containing up to 10 wt% of residual monomer MMA doped with the photoinitiator titanocendichloride have been used. The mechanism for the formation of the desired refractive index pattern is the photoinduced residual polymerisation. The 2-dimensional patterns have been recorded in 2 subsequent steps using a 2-beam holgaphic setup. In a first step the recording process has been characterized for a single volume phase holographic grating with the grating constant Λ1. The recording procedure is optimized towards a short term exposure period of the order of a few seconds, followed by self-developing period. While the first pattern is developing the sample may be turned by an arbitrary angle Φ and a second volume phase grating with a different lattice constant Λ2 can be recorded. If e.g. an orthogonal crystalline symmetry is desired, the angle Φ will be chosen as Φ = 90°. After recording of the second grating the sample is developed and fixed by a thermal treatment. The obtained 2-D crystals are characterized using a goniometer with 2 rotary stages by the evaluation of the diffraction patterns. The different diffracted orders may be indexed according to their (h,k) Miller´s indices.
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Rafael Meinhardt, Rafael Meinhardt, Ansgar Draude, Ansgar Draude, Hilmar Franke, Hilmar Franke, Roger A. Lessard, Roger A. Lessard, } "Holographic recording of 2D photonic crystals in photosensitized PMMA", Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); doi: 10.1117/12.562602; https://doi.org/10.1117/12.562602

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