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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.22: Poster

Montag, 27. März 2006, 09:30–17:00, P1

Construction of a wavelength filter in Lithiumniobat by irradiation — •Stefanie Haubrich, Matz Haaks, Konrad Peithmann, and Karl Maier — Helmholtz-Institut für Strahlen- und Kernphysik der Rheinischen Friedrich-Wilhelms-Universität zu Bonn, Nußallee 14-16, 53115 Bonn

Lithiumniobat (LiNbO₃) is an interesting ferroelectric material well suited for applications in holographic storage and integrated optics. Periodic structures in the refractive index in the propagation direction of the light generate a frequency sensitive filter. Recent experiments proofed that the refractive index of LiNbO₃ can be changed by irradiation with light high energy ions. [1] In a proof of principle we create a periodic pattern of the refractive index by irradiating a LiNbO₃ crystal with ³He. Thereby the ion beam is shaded by a parallel array of thin Tantalum foils arranged with a distance of 3 µm. For an exact positioning of the array a 20 nm layer of Aluminum is deposited on the crystals surface and structured with parallel lines in 3 µm distance by laser ablation. The position can be controlled by interference between both line-structures.

[1] K. Peithmann et al., Appl. Phys. B, (2005), in press