| http://www.w3.org/ns/prov#value | - Epitaxial growth of ferroelectric films is indispensable for various reasons including the availability of single crystals, the complexity involved in fabricating lightguides using single crystals, and, particularly in the case of thin-film lightguides, the strict refractive index conditions for lightguide modes and the need to achieve lower optical loss to produce single-crystal grade characteris
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