研究目的
Investigating the effect of a reorientable anisotropic cladding on the behavior of Transverse Electric (TE) and Transverse Magnetic (TM) mode polarisations in liquid crystal-clad planar waveguides.
研究成果
The study demonstrates that the steering magnitude of LC-clad waveguides is influenced by mode confinement and the initial alignment of the LC. TE and TM modes exhibit different steering behaviors due to their interaction with the LC index ellipsoid. The findings are consistent with simulation results, providing insights into the design of efficient LC-based beam steering devices.
研究不足
The study neglects the distorted LC profile that results from an applied field and uses a step index approximation for the waveguide. The analysis is limited to steady-state positions of the beam after switching dynamics are complete.
1：Experimental Design and Method Selection:
The study utilizes a planar dielectric waveguide with a liquid crystal (LC) cladding to investigate the interaction between the guided mode and the LC cladding. Theoretical models and simulations are employed to understand the behavior of TE and TM modes.
2：Sample Selection and Data Sources:
Three devices were fabricated with different core thicknesses and LC alignments to study the effect of mode confinement and LC alignment on beam deflection.
3：List of Experimental Equipment and Materials:
A mid-wave infrared (MWIR) quantum cascade laser (QCL) centered at 4.55μm, LC TL-213 (Merck), and various waveguide materials including As2S3 and As2Se
4：55μm, LC TL-213 (Merck), and various waveguide materials including As2S3 and As2SeExperimental Procedures and Operational Workflow:
3.
4. Experimental Procedures and Operational Workflow: Guided modes are excited in the waveguide using the QCL, and the out-coupled beam is imaged with a MWIR camera. The deflection angle is quantified by determining the centroid of the out-coupled spot on a target.
5：Data Analysis Methods:
Simulations were carried out using COMSOL Multiphysics 5.4 with the Wave Optics Module to compare with experimental results.
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