Electrically Tunable Metasurface Filter for Multi-Wavelength Pixels
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Solution Overview
Problem
Current optical sensors and emitters require multiple filters to sense or emit different electromagnetic radiation wavelengths, which increases device size and complexity, and are not efficiently adaptable to varying ambient light conditions.
Innovation Solution
Incorporating an electrically-tunable metasurface with conductive nanostructures and layers, allowing for dynamic adjustment of optical filtering properties by changing the electrical bias, enabling a single pixel to sense or emit multiple wavelengths and optimizing performance for different light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical filters are used to sense different electromagnetic radiation wavelengths, then the sensing capability for different wavelengths is improved, but the device size and complexity increase
Solution Approach 1:
The patent implements a single optical filter that can perform multiple functions by dynamically tuning its optical properties through electrical biasing. The metasurface structure with conductive layers and variable permittivity material allows one filter to replace multiple fixed filters, enabling the same physical component to sense different wavelengths at different times without increasing device complexity
Solution Approach 2:
The patent introduces dynamic tunability to the optical filter by using a variable permittivity material whose optical properties can be changed in real-time through electrical biasing. This allows the filter to adapt its transmission characteristics dynamically, enabling wavelength switching without mechanical movement or multiple fixed filters, thus reducing device complexity while maintaining versatility
2Adaptability or versatility
If multiple optical filters are used to emit different electromagnetic radiation wavelengths, then the emission capability for different wavelengths is improved, but the device size and complexity increase
Solution Approach 1:
The patent applies the same single tunable filter approach to optical emission, allowing one filter component to emit multiple wavelengths by electrical tuning. This multi-functional filter replaces multiple wavelength-specific filters, reducing the overall device size and complexity while maintaining the capability to emit different wavelengths at different times
Solution Approach 2:
The patent enables dynamic control of emission wavelengths through electrical biasing of the variable permittivity material in the filter. This allows the emission spectrum to be tuned in real-time without mechanical adjustments or multiple fixed filters, achieving versatile emission capability with simplified device architecture
3Ease of manufacture
If fixed optical filters are used, then the manufacturing simplicity is maintained, but the adaptability to varying ambient light conditions deteriorates
Solution Approach 1:
The patent changes the optical parameters of the filter dynamically by using a variable permittivity material that can be electrically biased to alter its permittivity. This allows the same manufactured filter structure to adapt its transmission characteristics to different ambient light conditions without requiring multiple physically different filters, maintaining manufacturing simplicity while achieving adaptability
Solution Approach 2:
The patent replaces mechanical or physical filter changes with electrical control of the variable permittivity material. Instead of physically switching between multiple filters or adjusting mechanical properties, the system uses electrical biasing to tune the optical properties, simplifying the control mechanism while enabling adaptability to varying light conditions
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 reduces device size and complexity by allowing a single pixel to sense or emit multiple wavelengths, enhances adaptability to varying ambient light, and conserves power by adjusting brightness and color accordingly.
Implementation Method 1
A metasurface may include a first conductive layer having an electrically-tunable optical property... A change in an electrical bias between the metasurface and the second conductive layer may tune the electrically-tunable optical property
Implementation Method 2
The metasurface may include an array of conductive nanostructures disposed on a first side of the first conductive layer... change an electrically-tunable optical filtering property of the metasurface
Data Source
AI summary
An optical device stack includes at least one of a photodetector or an optical emitter and a metasurface. The metasurface is disposed over a light-receiving surface of the photodetector or a light emission surface of the optical emitter. The metasurface includes a first conductive layer having an electrically-tunable optical property and an array of conductive nanostructures disposed on a first side of the first conductive layer. A second conductive layer is disposed on a second side of the first conductive layer. An electrical insulator is disposed between the first conductive layer and the second conductive layer. A change in an electrical bias between the metasurface and the second conductive layer, from a first electrical bias to a second electrical bias, tunes the electrically-tunable optical property from a first state to a second state, and changes an electrically-tunable optical filtering property of the metasurface.