Active Metamaterial Array Ion Migration Control
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Solution Overview
Problem
Current active metamaterial arrays have limitations in varying frequency and phase range due to restricted design methods, making it difficult to commercialize terahertz systems effectively.
Innovation Solution
An active metamaterial array is designed with a substrate, spaced metamaterial structures, a conductivity variable material layer, an electrolyte material layer, and a gate electrode that controls ion migration to change conductivity, allowing for selective connection and disconnection of metamaterial structures, thereby varying resonant frequency and phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conductivity variable material is coated on the entire substrate to switch resonance, then the resonance can be switched without additional patterns, but the resonant frequency cannot be varied to a desired frequency or phase
Solution Approach 1:
The substrate is divided into multiple regions with different conductivity variable materials (first, second, and third conductivity variable materials) having different threshold voltages. This segmentation allows different areas to be controlled at different voltage levels, enabling independent control of resonance frequency and phase without requiring additional complex patterns or structures.
2Adaptability or versatility
If semiconductor layers are added to vary resonant frequency with external stimulus, then the resonant frequency can be varied, but the variable range is limited within the structure and electrical wire arrangement becomes difficult
Solution Approach 1:
The invention extracts the conductivity control function from complex semiconductor layer structures and electrical wire arrangements, and implements it through a simplified gate electrode structure that applies voltage to different regions of the conductivity variable materials. This removes the need for complex wire arrangements while maintaining frequency variability.
Solution Approach 2:
The invention changes the control parameter from complex structural modifications (semiconductor layers and wire arrangements) to simple voltage parameter control. By applying different voltage levels to different regions with different threshold voltages, the system can vary resonant frequency and phase through parameter changes rather than structural changes.
3Ease of manufacture
If conventional design methods are used, then the manufacturing process is simple, but the variable range of frequency and phase is limited
Solution Approach 1:
Different regions of the substrate are assigned different conductivity variable materials with different threshold voltages (first, second, and third regions). This local quality differentiation allows each region to respond to voltage control at different thresholds, expanding the overall frequency and phase variable range while maintaining manufacturing simplicity through a layered structure approach.
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 design provides a wide variable range and high selectivity in frequency and phase with reduced processes and costs, overcoming limitations in controlling terahertz waves and enabling precise modulation of phase and frequency, applicable to terahertz, visible, infrared, and ultraviolet bands.
Implementation Method 1
when an external voltage is applied to the gate electrode, the gate electrode changes the conductivity of the conductivity variable material layer by controlling the migration of ions contained in the electrolyte material layer
Implementation Method 2
a conductivity variable material layer formed between each of the multiple metamaterial structures so as to selectively connect the metamaterial structures
Data Source
AI summary
An active metamaterial array of the present disclosure includes: a substrate; a plurality of metamaterial structures disposed on the substrate and spaced apart from each other; a conductivity variable material layer formed between each of the plurality of the metamaterial structures so as to selectively connect the metamaterial structures; an electrolyte material layer formed on the metamaterial structures and the conductivity variable material layer; and a gate electrode disposed at one end of the substrate so as to be in contact with one region of the electrolyte material layer, and when an external voltage is applied to the gate electrode, the gate electrode changes the conductivity of the conductivity variable material layer by controlling the migration of ions contained in the electrolyte material layer.