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We present a practical approach to the numerical optimisation of the guiding properties of buried microstructured waveguides, which can be fabricated in a z-cut lithium niobate (LiNbO3) crystal by the method of direct femtosecond laser inscription. We demonstrate the possibility to extend the spectral range of low-loss operation of the waveguide into the mid-infrared region beyond 3um.
Bibliographical noteThis paper was published in Optical materials express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-4-3-541. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Funding: Leverhulme Trust [RPG-278]; Engineering and Physical Sciences Research Council [EP/J010413/1]
- optical waveguides
- lithium niobate
- integrated optics
- direct femtosecond laser microfabrication
- microstructured waveguide