Electro-Optic Waveguide Beam Steering
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Solution Overview
Problem
Conventional waveguides with liquid crystal materials are limited in controlling light propagation direction and suffer from substantial light attenuation and mechanical complexity, making them unsuitable for compact, efficient, and reliable light control in devices like barcode scanners and CD/DVD players.
Innovation Solution
A liquid crystal waveguide with a taper region and patterned electrodes is designed to dynamically control light propagation direction by varying the refractive index of the liquid crystal material with applied voltage, allowing light to be steered both in and out of the plane of the waveguide without mechanical parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional waveguides with liquid crystal materials are used to control light propagation, then light steering capability is provided, but substantial light attenuation occurs and the device becomes mechanically complex
Solution Approach 1:
The patent replaces mechanical beam steering systems (mirrors, galvanometers) with an electro-optic waveguide system using liquid crystal materials. The liquid crystal layer's refractive index is modulated by applied voltages to deflect light beams electronically, eliminating moving mechanical parts and reducing light attenuation associated with mechanical systems.
Solution Approach 2:
The invention changes the refractive index parameter of the liquid crystal material through applied electric fields. By varying the voltage across the liquid crystal layer, the refractive index is dynamically adjusted, enabling continuous control of light propagation direction without mechanical movement, thereby reducing light loss and improving operational efficiency.
2Ease of operation
If mechanical devices are used to control light direction, then light steering is achieved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent substitutes mechanical light steering devices (mirrors on galvanometers, moving lenses) with a stationary waveguide structure containing liquid crystal material. The liquid crystal's electric field-responsive refractive index allows electronic control of light direction, eliminating gears, bearings, and other mechanical components that increase complexity and maintenance needs.
3Ease of operation
If conventional liquid crystal layers are used for light control, then optical phase delay is achieved, but the layers must be prohibitively thick which renders the device opaque and slow
Solution Approach 1:
The invention utilizes the electric field-induced refractive index change in liquid crystal materials to achieve optical phase delay with thin layers. By applying voltages that modify the liquid crystal's refractive index, sufficient phase control is obtained without requiring thick layers that would cause opacity and slow response times, enabling fast, transparent optical modulation.
4Volume of moving object
If standard thin liquid crystal cells are used for beam steering, then compactness is achieved, but only minimal control range (micro-degrees) is realized
Solution Approach 1:
The patent employs a waveguide structure with liquid crystal material that combines compactness with enhanced steering capability. The waveguide confines and directs light through the liquid crystal layer, allowing voltage-controlled refractive index changes to produce beam deflections significantly greater than micro-degrees while maintaining a compact form factor, thus improving both adaptability and versatility.
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 solution enables precise electronic control of light beams, reducing mechanical complexity and light attenuation, and allowing for compact, efficient, and reliable light steering in various applications.
Implementation Method 1
electro-optic materials are employed whereby a voltage applied across the material changes the index of refraction, n
Implementation Method 2
a taper region where the distance between the core of the waveguide and an out-coupling medium is decreased towards the output end of the waveguide, which encourages a beam of light or a laser beam, as it travels through the taper region, to exit the waveguide in a direction that is out-of-the-plane of the optical waveguide
Data Source
AI summary
A substantially planar waveguide for dynamically controlling the out-of-plane angle at which a light beam exits the waveguide. Generally, liquid crystal materials may be disposed within a waveguide in a cladding proximate or adjacent to a core layer of the waveguide. In one example, the waveguide may contain one or more taper regions such that the light beam exits the waveguide and propagates out-of-the-plane of the waveguide into an out-coupling medium at a propagation angle. In one example, the waveguide may contain one or more electrodes onto which one or more voltages may be applied. The magnitude of the propagation angle may be electronically controlled by altered by controlling or altering the magnitude of the one or more applied voltages.