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Photonic defect modes in cholesteric liquid crystal resonators with embedded isotropic layers
Optics Express
|June 14, 2025
Summary
Photonic defect modes in liquid crystal structures offer high performance for photonic applications. Controlling these modes is key for tuning resonance frequencies and enabling directional light emission.
Area of Science:
- Photonics
- Soft Matter Physics
- Liquid Crystal Technology
Background:
- Photonic defect modes offer high Q-factors and local density of states, beneficial for applications like lasing and cavity quantum electrodynamics.
- Standard photonic band edge modes are sensitive to structural changes, necessitating precise control for desired resonance frequencies.
Purpose of the Study:
- To investigate photonic defect modes in a structure with an isotropic layer between cholesteric liquid crystal (CLC) layers.
- To analyze the influence of geometrical and material parameters on defect mode eigenfrequencies and Q-factors.
- To explore asymmetric resonators for directional light emission and connect defect modes to topological soft matter photonics.
Main Methods:
- Full electrodynamics numerical simulations were employed.
- Analysis included transmission spectra and electric field profiles of defect modes.
- Parameters studied: refractive indices, thicknesses of isotropic and CLC layers, and boundary anchoring orientations.
Main Results:
- Detailed analysis of photonic defect modes in CLC/isotropic/CLC structures.
- Influence of various parameters on eigenfrequencies and Q-factors was quantified.
- Demonstrated control over directional light emission in asymmetric resonators.
Conclusions:
- Photonic defect modes in CLC structures are a promising alternative for photonic devices.
- Understanding parameter influence is crucial for designing tunable photonic devices.
- This work advances the design capabilities for topological soft matter photonics and defect mode lasing in CLC systems.
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