Planar Micro-Nano Optical Element for Selective Image Processing
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Solution Overview
Problem
Existing optical analog computing devices for image processing, particularly in fields like autonomous driving, face limitations due to large size, poor integration, and difficulty in compatibility with compact imaging systems, while also lacking the ability to selectively process target objects of different structural sizes.
Innovation Solution
A planar micro-nano optical analog computing device is designed using a micro-nano structure that adjusts physical parameters to achieve bandpass filtering transfer functions at different wavelengths, enabling selective image processing and edge extraction or denoising on target objects of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional Fourier optical system is used for image processing, then image edge extraction and denoising can be achieved, but the device size becomes large and integration is poor
Solution Approach 1:
The patent transforms the image processing function from spatial domain to frequency domain by changing the working parameters of the optical system. The micro-nano optical element is designed to work at specific resonance wavelengths where the real part of effective refractive index is zero, enabling bandpass filtering transfer functions that directly achieve edge extraction and denoising without requiring large Fourier optical systems
Solution Approach 2:
The patent uses a thin film micro-nano optical element structure that can be integrated into compact imaging systems. The micro-nano structure with specific geometric parameters (period, width, height) creates the desired optical transfer functions while maintaining a thin, integrable form factor that replaces bulky traditional optical systems
2Measurement precision
If optical high/low-frequency filtering is used, then image spatial filtering is implemented, but the device can only process target objects larger than a certain size and lacks size distinguishing ability
Solution Approach 1:
The patent introduces wavelength as a dynamic control parameter to achieve different transfer functions. By adjusting the incident light wavelength, the system can dynamically switch between different bandpass filtering functions with different frequency ranges, enabling selective processing of target objects with different structural sizes. The micro-nano optical element is designed with multiple resonance wavelengths where each wavelength corresponds to a specific transfer function for different size ranges
Solution Approach 2:
The patent designs a multi-functional optical analog computing device that can perform multiple image processing functions (edge extraction, denoising, size-selective processing) using a single micro-nano optical element. The element is engineered to support multiple resonance wavelengths, each providing different bandpass filtering capabilities, making the device universally applicable to various image processing tasks without requiring multiple separate components
3Device complexity
If single modulation function is used, then device structure is simple, but numerical aperture is limited and resolution is low
Solution Approach 1:
The patent optimizes the geometric parameters of the micro-nano structure (period, width, height) to achieve high numerical aperture and resolution. The structure is designed with specific parameter ratios and dimensions that enable broad angular acceptance and high spatial frequency transmission, improving numerical aperture without increasing device complexity. The micro-nano geometry is precisely engineered to control light propagation and enhance resolution
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 device achieves high numerical aperture and insensitive polarization, allowing for real-time, low-energy, and multi-functional image processing with size range selectivity, thereby enhancing image extraction resolution and reducing integration and processing difficulty.
Implementation Method 1
the planar micro-nano optical element corresponds to different transfer functions at different resonance wavelengths
Implementation Method 2
a relationship curve between the transfer function and an incident wave vector at different resonance wavelengths is rectangle bandpass filtering functions with different bandwidths
Data Source
AI summary
The present invention relates to the technical field of optical analog computing, and specifically provides a planar micro-nano optical analog computing device. A planar micro-nano optical element includes a micro-nano structure. By adjusting a physical parameter of the micro-nano structure, the planar micro-nano optical element corresponds to different transfer functions at different resonance wavelengths, and a relationship curve between the transfer function and an incident wave vector at different resonance wavelengths is rectangle bandpass filtering functions with different bandwidths. According to the present invention, based on the planar micro-nano optical element, required transfer functions at different wavelengths are designed, so that a wavelength-controlled two-dimensional multi-channel image optical analog computing device with a high numerical aperture and insensitive polarization can be implemented, and differential image processing can be performed on target objects with different structural sizes selectively.