Acousto-optic Device Patterned Electrode Uniformity
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Solution Overview
Problem
Acousto-optic devices suffer from non-uniform near field acoustic intensity in the transverse direction due to conventional rectangular electrode designs, leading to image blurring and artifacts in AO-based imaging systems and other AO devices operating in the near field region.
Innovation Solution
Patterned electrodes with multiple transverse edge positions spanning at least five percent of the average height of the electrode are used to create a more uniform acoustic intensity distribution, independent of the light ray path, reducing peak-to-peak variation in acoustic intensity by over 75% compared to conventional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional rectangular electrode is used, then the device structure is simple and easy to manufacture, but the acoustic intensity distribution in the transverse direction becomes non-uniform, causing image blurring and artifacts
Solution Approach 1:
The electrode is divided into multiple discrete segments along the transverse direction, with each segment having different dimensions. This segmentation allows independent control of acoustic radiation from each segment, enabling the creation of a uniform overall acoustic intensity distribution while maintaining manufacturing simplicity through standard lithographic processes.
Solution Approach 2:
Different segments of the electrode are given different local properties (different dimensions, positions, and orientations) to compensate for the non-uniform acoustic radiation pattern. By optimizing the local characteristics of each segment, the overall acoustic intensity distribution becomes uniform across the transverse direction, eliminating image blurring and artifacts.
2Manufacturing precision
If the electrode dimensions are increased to improve acoustic field coverage, then the acoustic intensity uniformity improves, but the device size increases and manufacturing complexity increases
Solution Approach 1:
Instead of using a single large electrode, the design segments the electrode into multiple smaller elements. This segmentation achieves uniform acoustic intensity distribution through the collective effect of the segments while keeping each individual segment manageable in size and simple to manufacture using standard lithographic techniques.
Solution Approach 2:
The electrode pattern is designed in the transverse dimension with segments of varying dimensions and positions. By utilizing the transverse spatial distribution of segments, the design achieves uniform acoustic intensity without requiring the electrode to extend significantly in the optical propagation direction, thus avoiding increased device complexity.
3Manufacturing precision
If patterned electrodes with multiple transverse edge positions are used, then acoustic intensity uniformity improves by over 75%, but the electrode manufacturing process becomes more complex
Solution Approach 1:
The electrode is segmented into multiple discrete regions with different transverse edge positions. This segmentation is achieved through standard photolithographic patterning processes, allowing the complex acoustic intensity uniformity to be achieved through a systematic division of the electrode into optimally dimensioned segments rather than requiring entirely new manufacturing techniques.
Solution Approach 2:
The electrode segments are designed with specific dimensional parameters (width, length, position) that are optimized to achieve uniform acoustic intensity. By carefully selecting and varying these geometric parameters across the different segments, the design achieves over 75% improvement in acoustic intensity uniformity while using standard manufacturing processes.
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 patterned electrodes significantly reduce image blurring and artifacts in AO-based imaging systems and enhance the uniformity of acoustic intensity across the AO device, improving the performance of both image-forming and non-image-forming AO devices.
Implementation Method 1
a piezoelectric transducer for coupling an electrical signal to a piezoelectric transducer
Implementation Method 2
Devices in which an acoustic beam and an optical beam interact are generally referred to as 'acousto-optic devices'
Data Source
AI summary
An acousto-optic (AO) device includes an AO interaction crystal for receiving and propagating a light ray along an optical propagation direction (OPD). A piezoelectric transducer is on at least one surface of the AO interaction crystal for receiving an electrical signal and emitting an acoustic wave into the AO interaction crystal. An electrode is on the piezoelectric transducer for coupling the electrical signal to the piezoelectric transducer. The electrode is a patterned electrode that includes a plurality of different transverse edge positions. The plurality of different transverse edge positions span a position range of at least five percent of an average height (Havg) of the electrode.