Evanescent Wave Conversion Using Indefinite Electromagnetic Medium
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Solution Overview
Problem
Conventional far-field optical systems have a resolution limit due to the inability to effectively convert evanescent electromagnetic waves into propagating waves, restricting the resolution beyond the diffraction limit.
Innovation Solution
The use of an indefinite electromagnetic medium with specific permeability and permittivity properties allows for the conversion of evanescent waves to propagating waves, and vice versa, by providing a hyperbolic dispersion relation that supports propagation of electromagnetic waves with large transverse wavevectors, enabling resolution beyond the conventional diffraction limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional far-field optical systems are used, then the system is simple and well-understood, but the resolution is limited by the diffraction limit
Solution Approach 1:
The patent introduces an indefinite medium as an intermediary component between the object and the detector. This medium converts evanescent waves to propagating waves, enabling the detection of sub-diffraction-limited features without fundamentally changing the simple far-field optical system architecture. The indefinite medium acts as a bridge that translates near-field information into detectable far-field signals.
Solution Approach 2:
The patent changes the electromagnetic parameters (permittivity and permeability) of the medium to create an indefinite medium with specific tensor properties. By carefully designing these parameters, the system can convert evanescent waves to propagating waves, thereby improving resolution beyond the conventional diffraction limit while maintaining relative system simplicity.
2Measurement precision
If evanescent waves are converted to propagating waves using indefinite medium, then resolution exceeds diffraction limit, but the medium structure becomes complex
Solution Approach 1:
The patent applies local quality by designing the indefinite medium with spatially varying electromagnetic parameters. Different regions of the medium have different permittivity and permeability tensors tailored to convert specific evanescent wave components to propagating waves. This localized optimization enables resolution enhancement while keeping the overall medium structure manageable through systematic design.
Solution Approach 2:
The patent employs composite material structures to realize the indefinite medium. By combining multiple materials with different electromagnetic properties in a structured manner, the system achieves the desired wave conversion functionality. The composite structure allows for tailored electromagnetic responses that enable evanescent-to-propagating wave conversion while distributing the structural complexity across multiple material layers.
3Productivity
If evanescent waves are converted to propagating waves, then data transfer rate increases, but energy loss may increase during conversion
Solution Approach 1:
The patent incorporates feedback mechanisms in the indefinite medium design to compensate for energy losses during the evanescent-to-propagating wave conversion process. By carefully designing the electromagnetic parameters and their spatial variations, the system can maintain energy efficiency while achieving high data transfer rates through enhanced wave conversion.
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 enables the conversion of evanescent waves to propagating waves, enhancing the resolution capabilities beyond the traditional diffraction limit, allowing for improved imaging and optical systems with extended depth of field.
Implementation Method 1
conversion of evanescent electromagnetic waves to non-evanescent electromagnetic waves and/or conversion of non-evanescent electromagnetic waves to evanescent electromagnetic waves
Implementation Method 2
electromagnetic responses that include electromagnetic near-field lensing and/or conversion of evanescent electromagnetic waves to non-evanescent electromagnetic waves
Data Source
AI summary
Apparatus, methods, and systems provide conversion of evanescent electromagnetic waves to non-evanescent electromagnetic waves and/or conversion of non-evanescent electromagnetic waves to evanescent electromagnetic waves. In some approaches the conversion includes propagation of electromagnetic waves within an indefinite electromagnetic medium, and the indefinite medium may include an artificially-structured material such as a layered structure or other metamaterial.