Acousto-optic Structure with Cavity Layer for Wave Confinement
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Solution Overview
Problem
Current acousto-optic devices face limitations in enhancing the interaction between acoustic and optical waves, particularly in reducing energy loss and radiation loss, while maintaining effective wavelength scales for efficient modulation and control of optical waves.
Innovation Solution
A multi-layered acousto-optic structure is designed with alternating layers of different acoustic and optical impedances, featuring a cavity layer in the middle to confine both waves, and additional substructures with hierarchical arrangements to optimize wave interaction and minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layered structure with alternating layers of different acoustic and optical impedances is used, then the interaction between acoustic and optical waves is enhanced, but the device complexity increases
Solution Approach 1:
The device is divided into multiple alternating layers with different acoustic and optical impedances. Each layer is designed with specific thickness and material properties to optimize wave interaction. The segmentation creates multiple interfaces that enhance the coupling between acoustic and optical waves through constructive interference, thereby improving interaction efficiency while managing complexity through systematic layer design.
Solution Approach 2:
The patent employs composite material structures where layers with contrasting acoustic and optical impedance are combined. This composite approach allows simultaneous optimization of acoustic wave propagation and optical wave confinement. The different material properties of each layer work together to enhance the overall acousto-optic interaction, resolving the contradiction between interaction efficiency and structural complexity.
2Loss of energy
If a cavity layer is introduced to confine waves, then energy loss and radiation loss are reduced, but the device complexity increases
Solution Approach 1:
The cavity layer is nested within the multi-layered structure, creating a confined region where acoustic and optical waves are trapped and enhanced. The cavity is positioned between specific layers and has dimensions designed to support resonant modes. This nesting approach allows the cavity to function as an integral part of the overall structure, reducing energy loss while adding minimal complexity to the device architecture.
Solution Approach 2:
The cavity layer's dimensions, position, and material properties are carefully optimized to achieve wave confinement at specific frequencies. By adjusting the cavity thickness and the impedance contrast of surrounding layers, the device achieves reduced radiation loss and enhanced interaction efficiency. This parameter optimization allows the cavity to effectively reduce energy loss without requiring overly complex structural modifications.
3Reliability
If hierarchical arrangements of substructures are added to optimize wave interaction, then acousto-optic interaction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The hierarchical structure is segmented into repeating unit cells, each comprising specific layers and substructures. This segmentation allows the complex hierarchical arrangement to be manufactured through repeated deposition or fabrication of standardized units. The regular repeating pattern simplifies manufacturing control compared to completely arbitrary structures, as each unit cell can be fabricated with the same precision requirements.
Solution Approach 2:
The hierarchical substructures are designed with specific thickness ratios and dimensional relationships that optimize wave interaction. By establishing clear parameter relationships (such as thickness ratios between different layers), the design provides manufacturing guidance and tolerance specifications. These parameter optimizations balance the need for enhanced interaction with practical manufacturing precision capabilities.
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
This configuration enhances the interaction between acoustic and optical waves by reducing energy loss and radiation loss, achieving strong wave confinement and increased reflectance, thereby improving the acousto-optic interaction and frequency shifting capabilities.
Implementation Method 1
a pair of multi-layered structures including a structure in which two layers with different acoustic impedance and optical impedance are alternately arranged
Implementation Method 2
two layers with different acoustic impedance and optical impedance are alternately arranged
Implementation Method 3
the two layers are symmetrically arranged with respect to the cavity layer so that the acoustic wave and the optical wave may be confined in the cavity layer
Implementation Method 4
a cavity layer disposed between the pair of multi-layered structures in the direction in which the acoustic wave and the optical wave propagate, and made of a medium having acoustic impedance and optical impedance that are different from those of interfacing layers at both sides
Implementation Method 5
the acoustic wave and the optical wave may be confined in the cavity layer
Implementation Method 6
An acousto-optic interaction is a phenomenon that modulates propagating directions, frequencies, wavelengths, and intensity of optical waves by acoustic waves
Data Source
AI summary
An acousto-optic structure according to an exemplary embodiment of the present invention is a stacked structure for inducing an interaction between incident acoustic wave and incident optical wave, and it includes: a pair of multi-layered structures including a structure in which two layers with different acoustic impedance and optical impedance are alternately arranged in a direction in which the acoustic wave and the optical wave propagate; and a cavity layer disposed between the pair of multi-layered structures in the direction in which the acoustic wave and the optical wave propagate, and made of a medium having acoustic impedance and optical impedance that are different from those of interfacing layers at both sides, wherein the two layers are symmetrically arranged with respect to the cavity layer so that the acoustic wave and the optical wave may be confined in the cavity layer.