ENZ Near Field Lens for Subwavelength Imaging Resolution
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Solution Overview
Problem
Optical microscopes face limitations in observing objects smaller than half a wavelength of light due to the majority of scattered light being near-field light that remains near the object, making it difficult to achieve high resolution and sensitivity, especially with existing near-field scanning optical microscopy (NSOM) equipment and meta-materials being complex to fabricate and utilize.
Innovation Solution
A near-field lens comprising an epsilon near zero (ENZ) material layer with a dielectric constant close to zero, integrated with a substrate, which enables the transmission of near-field light to a far field, enhancing resolution and sensitivity, and a near-field imaging apparatus that includes a light source, optical lens, and image sensor to capture and process the transmitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If near field scanning optical microscopy (NSOM) equipment is used to achieve high resolution, then resolution is improved, but productivity is worsened due to scanning one point at a time
Solution Approach 1:
The patent divides the imaging process into two functional components: a near field lens for wide-area parallel light collection and an optical lens for focusing. This segmentation allows simultaneous imaging of multiple points while maintaining high resolution, overcoming the sequential scanning limitation of NSOM
Solution Approach 2:
The patent introduces a near field lens as an intermediary component between the object and the optical lens. This near field lens converts near field light into far field light, enabling the optical lens to focus the light and form images without requiring point-by-point scanning
2Measurement precision
If meta-material is used to create a super lens for resolving the diffraction limit, then resolution is improved, but device complexity is worsened due to complicated structure
Solution Approach 1:
The patent changes the optical parameters of the lens system by using a near field lens with specific refractive index properties. This allows the lens to focus near field light without requiring the complex subwavelength structures of meta-materials, simplifying the device while achieving super-resolution
Solution Approach 2:
The patent extracts the near field light collection function from the complex meta-material structure and implements it through a simpler near field lens design. This extraction maintains the resolution-enhancing capability while eliminating the fabrication complexity of meta-materials
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 proposed solution allows for high-resolution imaging of subwavelength objects by effectively transmitting near-field light to a far field, improving the resolution and sensitivity of imaging systems, and simplifying the structure and fabrication process compared to meta-materials, while maintaining unique optical properties.
Implementation Method 1
an epsilon near zero (ENZ) material layer, which is arranged on the substrate and is formed of a material with a dielectric constant that includes a real part having a value of zero or a value very close to zero
Data Source
AI summary
A near field light includes a substrate; and an epsilon near zero (ENZ) material layer, which is arranged on the substrate and is formed of a material with a dielectric constant that includes a real part having a value of zero or a value very close to zero with respect to a light of a designated wavelength.