Cholesteric Liquid Crystal Domain Structure for Compact Optical Reflection
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Solution Overview
Problem
Conventional lenses for reflecting light in optical systems are costly and inefficient, often requiring separate components like partially reflective windows and concave lenses, which restrict size and shape flexibility and increase system complexity.
Innovation Solution
A liquid crystal optical device using a layer of cholesteric liquid crystal arranged in domains with helical axes of varying orientations, allowing for reflective and transmissive properties that can focus incident light waves within a specific wavelength range, eliminating the need for separate reflective and transmissive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tilted window with partially reflective coating is provided to reflect light to the back monitor photo detector, then light reflection is achieved, but both a partially reflective window and a separate lens must be manufactured and mounted, increasing system cost and complexity
Solution Approach 1:
The patent combines the functions of the tilted window (light reflection) and the lens (light focusing/direction) into a single integrated lens component. The lens incorporates a reflective coating on its rear surface, eliminating the need for separate reflective window and lens components. This merging reduces system complexity, manufacturing costs, and assembly requirements while maintaining the dual functionality of reflecting light to the back monitor photo detector and directing light to the desired destination.
2Reliability
If a tilted window with partially reflective coating is provided to reflect light, then light reflection is achieved, but insufficient room between the light source and the desired destination cannot accommodate both a partially reflective window and a separate lens
Solution Approach 1:
The patent merges the reflective window and lens into a single integrated component, significantly reducing the space required in the optical path. By incorporating the reflective coating directly on the rear surface of the lens, the design eliminates the need for separate components that would require additional mounting space and alignment room. This integration enables compact system design while maintaining full light reflection and direction functionality.
3Reliability
If a concave lens with transmissive and reflective parts is provided, then light reflection is achieved, but the size and shape of the lens are restricted
Solution Approach 1:
The patent applies local quality by implementing a reflective coating on a specific region of the lens (the rear surface) while maintaining the overall lens geometry flexibility. This allows different portions of the lens to have different optical properties: the front surface maintains standard lens curvature for light transmission and focusing, while the rear surface incorporates the reflective coating for light reflection. This approach enables the lens to adapt to various sizes and shapes without being constrained by the requirements of conventional concave lenses with integrated reflective surfaces.
4Reliability
If conventional lenses are used to reflect light, then light reflection is achieved, but the system becomes costly due to manufacturing and mounting of separate components
Solution Approach 1:
The patent combines multiple optical functions into a single lens component, reducing the total number of parts that need to be manufactured and assembled. By integrating the reflective coating directly on the lens, the design eliminates separate manufacturing processes for reflective windows and reduces assembly steps for mounting multiple components. This integration simplifies the supply chain, reduces inventory requirements, and lowers overall system manufacturing costs while maintaining reliable light reflection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cholesteric liquid crystal device provides a cost-effective, flexible, and efficient means to reflect and focus light, suitable for various applications by adjusting reflectivity through electrical control, reducing system complexity and increasing optical power while maintaining a compact design.
Implementation Method 1
a wavefront of a light wave having a wavelength within a range of wavelengths changes after reflecting from the layer of cholesteric liquid crystal
Implementation Method 2
a wavefront of a light wave having a wavelength within a range of wavelengths changes after reflecting from the layer of cholesteric liquid crystal
Data Source
AI summary
A liquid crystal optical device that includes a first substrate layer that is substantially flat and a second substrate layer that is substantially flat and parallel to the first substrate layer. The liquid crystal optical device further includes a layer of cholesteric liquid crystal disposed between the first substrate layer and the second substrate layer, where the layer of cholesteric liquid crystal is arranged in domains, each domain having a helical axis, wherein the helical axes of the domains have a plurality of orientations relative to an orientation of the first and second substrate layers, and where a wavefront of a light wave having a wavelength within a range of wavelengths changes after reflecting from the layer of cholesteric liquid crystal.