Electro-Optic Beam Steering Using Phase Modulation
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Solution Overview
Problem
Existing beam steering systems face limitations in mechanical reliability, response time, manufacturing complexity, and efficiency due to mechanical components, and non-mechanical systems suffer from limited steering capability and high voltage issues.
Innovation Solution
A high diffraction efficiency modulo 2πn optical beam scanner is developed, utilizing optically active rows between substrates with electrode layers and insulators, allowing for dynamic changes in the index of refraction to steer optical beams without mechanical parts, using electro-optically active materials and phase delay progression stages to achieve efficient beam steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical beam steering systems are used, then beam steering capability is achieved, but mechanical complexity and reliability issues increase
Solution Approach 1:
The patent replaces mechanical beam steering systems with an electro-optic system that uses voltage-controlled phase modulation to steer beams. The system applies progressive voltage phases across multiple electrode zones to create beam steering without any mechanical moving parts, thereby improving reliability while reducing mechanical complexity.
Solution Approach 2:
The patent changes the operating parameters by using voltage phase progression across electrode zones instead of mechanical movement. By controlling the phase difference between adjacent zones through voltage application, the system achieves beam steering through parameter modulation rather than physical displacement.
2Speed
If mechanical beam steering systems are used, then beam steering is achieved, but response time is limited
Solution Approach 1:
The patent eliminates mechanical components that limit response time by using electro-optic modulation. The system can change beam direction by simply changing voltage phases, which occurs on nanosecond timescales, dramatically improving response time compared to mechanical systems that require physical movement.
3Device complexity
If non-mechanical beam steering systems are used, then mechanical complexity is reduced, but steering capability is limited
Solution Approach 1:
The patent divides the beam steering aperture into multiple discrete electrode zones, each independently controllable with different voltage phases. This segmentation allows the system to achieve complex beam steering patterns and multiple beam directions using non-mechanical means, thereby improving steering capability while maintaining low mechanical complexity.
Solution Approach 2:
The patent adds the dimension of phase control across multiple zones to achieve beam steering. Instead of relying on single-degree-of-freedom mechanical movement, the system uses multi-dimensional voltage phase progression across zones to control beam direction, enhancing steering capability without mechanical complexity.
4Speed
If non-mechanical beam steering systems are used, then response time is improved, but voltage differences become excessive
Solution Approach 1:
The patent segments the voltage application into multiple zones with progressive phase steps. Instead of applying a single large voltage difference across the entire aperture, the system uses smaller incremental voltage steps across adjacent zones, reducing peak voltage requirements while maintaining fast response time through electronic control.
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 enhances beam steering efficiency by reducing mechanical complexity, improving response time, and minimizing voltage differences, enabling precise and efficient optical beam steering with reduced fringing field effects and fly-back distances.
Implementation Method 1
Each optically active row contains at least two active cells made of an electro optically active material whose index of refraction or other optical characteristics can be dynamically changed in one, or both, polarizations
Data Source
AI summary
An example system includes a high-side electrode layer including a number of discrete electrodes and a low-side electrode layer. The system further includes an electro-optic (EO) layer including an EO active material positioned between the high-side electrode layer and the low-side electrode layer, thereby forming a number of active cells of the EO layer. Each of the number of active cells of the EO layer includes a portion of the EO layer that is positioned between one of the discrete electrodes and the low-side electrode layer. The example system further includes an insulator operationally coupled to the active cells of the EO layer, and at least partially positioned between a first one of the active cells and a second one of the active cells.