Visible-Light Metasurface Structure With Voltage-Tuned Modulation
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Solution Overview
Problem
Few meta devices are capable of active modulation in the visible light region, and existing devices typically operate in near-infrared or mid-infrared regions using ITO or graphene electrodes, limiting their functionality.
Innovation Solution
An active meta device with a simple structure, featuring a metal reflective plate, insulating layer, and alternating first and second modulation line blocks with transparent conducting layers and nano-antenna patterns, where different voltages are applied to control refractive indices for complex modulation in the visible light region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional meta devices use ITO or graphene electrodes, then they can operate in near-infrared or mid-infrared regions, but they cannot achieve active modulation in the visible light region
Solution Approach 1:
The patent changes the operating parameters by using alternative transparent conducting materials (such as zinc oxide, tin oxide, or aluminum-doped zinc oxide) with different electrical and optical properties compared to conventional ITO or graphene. This material substitution enables the device to operate in the visible light region while maintaining structural simplicity
Solution Approach 2:
The patent employs composite structures combining transparent conducting layers with dielectric materials and metal reflective plates. This composite approach creates a meta device that achieves visible light region operation through the synergistic properties of different materials, enabling active modulation without complex device architecture
2Ease of manufacture
If the device structure is simplified, then manufacturing becomes easier, but the capability for complex modulation in visible light region is reduced
Solution Approach 1:
The patent divides the modulation function into separate first and second modulation line blocks with different orientations. This segmentation allows each block to be independently controlled with different voltages, enabling complex modulation patterns while maintaining a simple overall device structure that is easy to manufacture
Solution Approach 2:
The patent designs a universal meta device structure that can achieve multiple modulation functions (amplitude, phase, polarization) through a single integrated platform. The same basic structure with transparent conducting layers, dielectric layers, and metal reflective plates can perform various modulation tasks by adjusting voltage applied to different line blocks, eliminating the need for multiple specialized components
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
Enables complex modulation in the visible light region with a simplified device structure, allowing for individual control of refractive indices through voltage biasing, thereby enhancing light modulation capabilities.
Implementation Method 1
a first voltage may be biased between the metal reflective plate and the nano-antenna pattern of the first modulation line block, and a second voltage may be biased between the metal reflective plate and the nano-antenna pattern of the second modulation line block
Data Source
AI summary
Disclosed is an active meta device. The device includes a metal reflective plate, an insulating layer on the metal reflective plate, a first modulation line block provided on one side of the insulating layer, and a second modulation line block provided on another side of the insulating layer facing the first modulation line block.