Electrically Controlled Metasurface Component for Dynamic Optical Switching
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Solution Overview
Problem
Conventional optical metasurfaces have limited optical reconfigurability, restricting their ability to dynamically control various properties and functionalities.
Innovation Solution
An optical component comprising a metasurface with an array of scattering structures, where each unit cell includes two different scattering structures contacting substances with varying refractive indices, controlled by a signal to switch optical properties, utilizing electrochemically switchable polymers like polyaniline for rapid refractive index changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical metasurfaces are used, then the optical properties are fixed or have strong limited reconfigurability, but this restricts the ability to dynamically control various properties and functionalities
Solution Approach 1:
The patent applies dynamics by making the metasurface optically reconfigurable through dynamic control of scattering structures. The scattering structures can change their optical properties (such as refractive index) in response to control signals, enabling the metasurface to dynamically adjust its optical characteristics for different applications like beam steering, focusing, and holography.
Solution Approach 2:
The patent implements parameter changes by modifying the optical properties of scattering structures through external stimuli. The refractive index of the scattering structures can be changed by applying control signals, allowing the metasurface to switch between different optical states and functionalities without changing the physical structure.
2Loss of energy
If optical properties are manipulated by thickness variations of conventional optics, then the manipulation is achieved, but undesired losses occur
Solution Approach 1:
The patent replaces conventional mechanical/optical thickness-based manipulation with a field-based approach. Instead of using thickness variations of conventional optics, the invention uses scattering structures with controllable optical properties that can be adjusted through external signals, reducing optical losses while achieving the same manipulation effects.
3Measurement precision
If optical metasurfaces are used to manipulate light by scattering from small nanostructures, then high resolution control over phase profile is achieved, but the optical reconfigurability is strongly limited
Solution Approach 1:
The patent resolves this contradiction by enabling parameter changes in the scattering structures. The refractive index and other optical parameters of the scattering structures can be dynamically adjusted through external control signals, allowing the metasurface to maintain high-resolution phase control while achieving reconfigurability for different optical functions.
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 fast and reversible switching of optical properties within milliseconds, allowing high-resolution control over phase profiles for diverse optical functions like holography and beam steering, with potential applications in ultra-thin optical devices for advanced communication systems.
Implementation Method 1
electrochemically switchable polymers like polyaniline for rapid refractive index changes
Implementation Method 2
provides a variable refractive index depending on the control signal
Implementation Method 3
optical metasurfaces are sub-wavelength patterned layers that interact strongly with light, altering the light properties over a subwavelength thickness by scattering from small nanostructures
Implementation Method 4
The manipulation of light is caused by nanostructures which resonantly capture the light and re-emit it with a defined phase, polarization, modality and spectrum
Data Source
AI summary
An optical component (1) comprising a planar metasurface (2) arranged on a surface of a first substrate (3) and a top layer (4) arranged in a height direction Z above the metasurface (2), wherein the metasurface (2) comprises an array (9) of scattering structures (5, 5a, 5b), wherein the array (9) is a repeating pattern of unit cells (7), wherein a unit cell (7) comprises at least two different scattering structures wherein the optical properties of the metasurface (2) are controllable by a control signal, wherein first scattering structures (5, 5a) are at least partially contacting a layer of a first substance (6a) having a first refractive index and second scattering structures (5, 5b) are at least partially contacting a layer of a second substance (6b), which differs from the first substance (6a) and which provides a variable refractive index depending on the control signal.