Metasurface Spectrometer Miniaturization via Nanostructure Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spectrometers are bulky and heavy due to the use of large optical elements, making them difficult to miniaturize while maintaining performance.
Innovation Solution
A spectrometer design incorporating a metasurface with two-dimensionally arranged nanostructures on a transparent substrate, including focusing, collimating, and grating metasurfaces, which replace traditional optical elements to achieve a smaller and lighter form factor while maintaining spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical elements (lenses, mirrors) are used in spectrometer design, then spectral resolution and performance can be maintained, but the device becomes bulky and heavy
Solution Approach 1:
The patent transforms the optical path length parameter from a spatial dimension to an effective optical path through metasurface design. By using sub-wavelength nanostructures with specific geometries and arrangements, the metasurface creates an effective optical path length much longer than the physical substrate thickness, achieving L/D > 3 while maintaining compact form factor. This parameter transformation resolves the contradiction between spectral resolution (requiring long optical path) and device weight (increasing with size).
Solution Approach 2:
The patent employs composite metasurface structures combining multiple materials with different refractive indices (e.g., silicon nitride, silicon dioxide, titanium dioxide) to achieve precise phase control and chromatic dispersion. These composite nanostructure assemblies enable the thin substrate to function as multiple optical elements (collimating, grating, focusing) simultaneously, maintaining spectral resolution while minimizing physical dimensions and weight.
2Measurement precision
If traditional optical elements are used, then spectral resolution is maintained, but the spectrometer size increases
Solution Approach 1:
The patent merges multiple optical functions (collimation, diffraction, focusing) into a single integrated metasurface component. Instead of using separate optical elements arranged along a long optical path, the metasurface combines all these functions in one thin layer, achieving the equivalent optical path length of traditional designs while reducing the physical footprint to a compact form factor.
Solution Approach 2:
The patent transitions from three-dimensional optical path propagation to two-dimensional metasurface interaction. By encoding optical path information in the spatial arrangement and geometric parameters of sub-wavelength nanostructures on a planar surface, the system achieves long effective optical path length without corresponding physical length increase, resolving the size-resolution contradiction.
3Productivity
If multiple optical elements are integrated to improve spectrum efficiency, then spectral performance improves, but device complexity increases
Solution Approach 1:
The patent designs the metasurface to perform multiple optical functions simultaneously through a single structure. The same array of nanostructures provides collimation, chromatic dispersion, and focusing capabilities, eliminating the need for multiple separate optical elements. This multi-functionality improves spectrum efficiency while reducing overall device complexity compared to traditional multi-component designs.
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
The metasurface-based spectrometer achieves improved spectrum efficiency and resolution with a compact size, satisfying the inequality L/D > 3, where L is the optical path length and D is the substrate thickness, thereby overcoming the size and weight limitations of traditional spectrometers.
Implementation Method 1
a focusing metasurface reflecting and focusing the light incident through the slit, at different angles based on respective wavelengths
Implementation Method 2
a grating metasurface including a plurality of nanostructures that are two-dimensionally arranged to have a chromatic dispersion function
Implementation Method 3
a collimating metasurface including a plurality of nanostructures that are two-dimensionally arranged to have a collimating function
Implementation Method 4
a focusing metasurface reflecting and focusing the light incident through the slit
Data Source
AI summary
A spectrometer includes a substrate; a slit which is provided on the substrate and through which light is incident onto the substrate; a metasurface including nanostructures that is configured to reflect and focus the light incident thereon through the slit, at different angles based on respective wavelengths; and a sensor which is provided on one side of the substrate that is opposite to another side of the substrate at which the metasurface is disposed, and configured to receive the light from the metasurface.