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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
Electro-optical device based on photonic structure with a dual-frequency cholesteric liquid crystal
Yu-Cheng Hsiao1, Chong-Yin Wu, Chih-Heng Chen
1Department of Physics, Chung Yuan Christian University, Chung-Li 32023, Taiwan.
Optics Letters
|July 19, 2011
Summary
A novel photonic device uses a photonic crystal infiltrated with dual-frequency cholesteric liquid crystal for tunable, polarizer-free optical filtering and modulation. This electrically controlled device offers rapid switching and adjustable light properties without needing polarizers.
Area of Science:
- Photonics
- Materials Science
- Liquid Crystal Displays
Background:
- Photonic crystals (PCs) offer unique light manipulation properties.
- Liquid crystals are widely used in optical devices but often require polarizers.
- Developing polarizer-free tunable optical devices remains a key challenge.
Purpose of the Study:
- To develop an electrically tunable and polarizer-free photonic device.
- To utilize a one-dimensional photonic crystal infiltrated with dual-frequency cholesteric liquid crystal (DFCLC) as a defect layer.
- To demonstrate the device's potential for various optical applications.
Main Methods:
- Fabrication of a one-dimensional photonic crystal (PC) infiltrated with dual-frequency cholesteric liquid crystal (DFCLC).
- Application of frequency-modulated voltage pulses to control the DFCLC defect layer.
- Characterization of the resulting photonic device's optical properties.
Main Results:
- The PC/DFCLC hybrid cell exhibited electrically tunable defect modes.
- Rapid bistable switching between stable states was achieved.
- The device demonstrated intensity and wavelength tunability without requiring polarizers.
Conclusions:
- The developed photonic device offers polarizer-free, electrically tunable optical functionalities.
- The device shows promise for applications such as tunable filters, fast-speed shutters, and light-intensity modulators.
- The use of DFCLC in a PC defect layer provides a versatile platform for advanced photonic devices.
