TITLE

Optical waveguiding in magnetron-sputtered Na[sub 0.5]K[sub 0.5]NbO[sub 3] thin films on sapphire substrates

AUTHOR(S)
Blomqvist, Mats; Khartsev, Sergey; Grishin, Alex; Petraru, Adrian; Buchal, Christoph
PUB. DATE
January 2003
SOURCE
Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p439
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Preferentially oriented perovskite-structured Na[SUB0.5]K[SUB0.5]NbO[SUB3] (NKN) thin films have been deposited on hexagonal A1[SUB2]O[SUB3](011_2) substrates using rf magnetron sputtering of a stoichiometric, high-density, ceramic target. Structural and film surface properties were measured using x-ray diffraction and atomic force microscopy, respectively. Optical and waveguiding properties were characterized using a prism-coupling technique. We observed sharp and distinguishable TM and TE propagation modes and measured the refractive index of NKN thin films of different thicknesses. The ordinary and extraordinary refractive indices were calculated to be n[SUB0] = 2.247 ± 0.002 and n[SUBe] =2.216 ± 0.002 for a 2.0-μm-thick film at 632.8 nm. This implies a birefringence Δn = n[SUBe] - n[SUB0] = - 0.031 ± 0.002 in the film. These first results show the potential use of rf-sputtered NKN films as an electro-optical active material.
ACCESSION #
8926050

 

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