Tunable Metasurface Optical Control
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Solution Overview
Problem
Existing tunable metasurfaces face challenges in achieving independent optical control of nanostructures due to limitations in wiring processes, particularly when dealing with a large number of pixels, as electrical wiring becomes cumbersome and difficult to scale below 100 nm.
Innovation Solution
The system employs a wavefront modulator and an optical focusing device to generate multiple controllable focal points on a metasurface composed of phase change materials. This optical control method allows for independent phase modulation of each nanostructure without the need for electrical wiring, enabling pixel-level phase change and overcoming the limitations of traditional electrical control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrical control with electrodes is used to switch phase change material states, then the metasurface can be tuned, but the wiring becomes cumbersome and difficult to scale when the number of pixels exceeds 1 million
Solution Approach 1:
The patent replaces the electrical control system (electrodes and wiring) with an optical control system. A control light source emits control lights that pass through a wavefront modulator and are focused by a lens array onto specific nanostructures. This optical addressing method eliminates the need for extensive electrical wiring while maintaining the ability to independently control each pixel's phase change state, thereby resolving the wiring complexity issue while preserving tunability.
2Reliability
If electrical control is used to heat phase change material, then phase transition can be achieved, but the electrode size is limited by manufacturing processes to around 100 nm
Solution Approach 1:
The patent substitutes electrical heating with optical heating. Control lights focused onto the nanostructures provide the necessary energy to induce phase transitions in the phase change material. This optical addressing method allows for precise spatial control of phase transitions without being constrained by electrode fabrication limitations, enabling independent control of each nanostructure regardless of size.
3Quantity of substance
If the number of pixels is increased to exceed 1 million, then the resolution and performance of the metasurface improve, but the wiring needs to be pulled quite far making pixel size constraints
Solution Approach 1:
The patent replaces the electrical wiring infrastructure with an optical control system. A single control light source, combined with a wavefront modulator and lens array, can address and control a large number of pixels simultaneously or sequentially. This eliminates the need for extensive wiring infrastructure that would be required to connect each of the over 1 million pixels electrically, thereby enabling high pixel counts without proportional increases in wiring length and complexity.
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 approach allows for precise optical control of the metasurface, enabling the creation of smaller or larger pixels as needed, thus expanding the applications of tunable metasurfaces, such as in all-solid-state lidar systems.
Implementation Method 1
the wavefront modulator is used to modulate a wavefront aberration of incident control lights and emit the control lights after wavefront modulated towards the optical focusing device
Implementation Method 2
the optical focusing device is used to focus wavefront-modulated control lights to form a plurality of focal points
Implementation Method 3
The phase change material can be converted between crystalline state and amorphous state, and phase change material of different states can achieve different modulation effects
Implementation Method 4
the metasurface is used to modulate a phase of an incident working light
Data Source
AI summary
A system of a tunable metasurface is provided, and the system of a tunable metasurface includes: a wavefront modulator, an optical focusing device, a metasurface; the metasurface includes a plurality of nanostructures made of a phase change material, and a phase change state of the phase change material comprises a crystalline state and an amorphous state; the wavefront modulator is set on a side of the optical focusing device that is far away from the metasurface; and the wavefront modulator is used to modulate a wavefront aberration of incident control lights and emit the control lights after wavefront modulated towards the optical focusing device; the optical focusing device is used to focus wavefront-modulated control lights to form a plurality of focal points; the metasurface is set on a focal plane formed by the plurality of focal points.