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Authors: T. Ako, J. Beeckman, W. Bogaerts, K. Neyts
Title: Tuning the Lateral Leakage Loss of TM-like modes in Shallow-etched Waveguides using Liquid Crystals
Format: International Journal
Publication date: 1/2014
Journal/Conference/Book: Applied Optics
Volume(Issue): 53(2) p.214-220
DOI: 10.1364/ao.53.000214
Citations: 3 (Web of Knowledge / Dimensions.ai - last update: 27/9/2020)
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Abstract

We examine the tuning effect a liquid crystal (LC) cladding has on the lateral leakage loss of TM-like
modes in shallow-etched waveguides. For such waveguides with an air cladding, the guided TM-like mode
and the unguided cladding TE-like mode can only be phase matched at precisely one angle. We find that
for an anisotropic cladding such as an LC, this phase matching is now possible for a range of angles. Each
of these angles corresponds to a given orientation of the molecules in the LC cladding. We show that the
waveguide width at which the minimum in leakage loss occurs can be changed by varying the orientation
of the LC cladding. We find different tuning regimes, identify a suitable tuning range, and discuss the
feasibility of tunable leakage loss experiments.

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