Addressable Plasmonic Arrays for Sub-Diffraction Imaging
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Solution Overview
Problem
Current imaging techniques face limitations in achieving sub-diffraction resolution due to the diffraction limit, requiring either invasive methods like scanning near-field techniques or expensive, high-vacuum technologies, which are slow and induce sample artifacts, and lack routine access to higher spatial resolutions and video-rate imaging speeds.
Innovation Solution
An imaging apparatus that electronically addresses and controls surface plasmon excitation in a pixel array, using configurations like Kretschmann or Grating Excitation to generate and manipulate surface plasmons for optical sub-diffraction imaging, allowing for controlled evanescent field interactions with samples without the need for labeling or high laser powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning near-field techniques are used to achieve sub-diffraction resolution, then spatial resolution is improved, but imaging speed deteriorates and sample artifacts are generated
Solution Approach 1:
The imaging system segments the continuous optical field into discrete pixel elements arranged in an array. Each pixel independently generates surface plasmons, enabling parallel acquisition of multiple spatial points simultaneously, thus achieving both high resolution and fast imaging speeds without the sequential scanning required by traditional near-field techniques
Solution Approach 2:
The patent replaces the mechanical scanning probe system with a stationary pixel array that electronically controls surface plasmon generation. This substitution eliminates the need for physical scanning movements, thereby dramatically improving imaging speed while maintaining sub-diffraction spatial resolution through the evanescent field interactions
2Measurement precision
If scanning near-field techniques are used to achieve sub-diffraction resolution, then spatial resolution is improved, but sample integrity deteriorates due to physical contact and artifacts
Solution Approach 1:
The patent introduces surface plasmons as an intermediary between the pixel array and the sample. The evanescent fields generated by surface plasmons interact with the sample at a nanoscale distance without requiring physical contact, thereby achieving high spatial resolution while preventing sample damage and artifact generation that would result from direct probe-sample contact
Solution Approach 2:
By replacing the mechanical probe system with an optical-electronic pixel array that generates surface plasmons, the patent eliminates the physical contact between the imaging system and the sample. This substitution removes the source of mechanical artifacts and sample damage while maintaining the ability to resolve sub-diffraction features
3Productivity
If conventional optical microscopy is used, then imaging speed is fast and sample integrity is maintained, but spatial resolution deteriorates due to the diffraction limit
Solution Approach 1:
The patent changes the fundamental optical parameter by generating evanescent fields through surface plasmon resonance instead of using propagating light waves. This parameter change allows the system to overcome the diffraction limit and achieve sub-wavelength spatial resolution while maintaining the fast imaging capabilities of optical microscopy through parallel pixel array operation
4Measurement precision
If high laser powers are used to achieve sub-diffraction resolution, then spatial resolution is improved, but energy consumption increases and sample damage risk increases
Solution Approach 1:
The patent applies local quality by generating surface plasmons at specific addressed pixels rather than illuminating the entire sample area with high-power laser light. This localized generation of evanescent fields concentrates the energy only where needed for imaging, dramatically reducing overall energy consumption and minimizing the risk of sample damage from excessive laser exposure
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
Enables high-resolution, fast, and cost-effective video-rate imaging of nano-scale processes without sample alteration, overcoming the diffraction limit and providing improved spatial resolution and image contrast compared to existing methods.
Implementation Method 1
Each pixel of the array is arranged to support a surface plasmon therein
Implementation Method 2
generate an evanescent electromagnetic field which extends transversely from the pixel
Implementation Method 3
The processing unit is arranged to change a temperature of the pixel to cause the surface plasmon resonance to become non-resonant
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An imaging apparatus (1) for imaging a sample (7) comprising an array of electronically addressable pixels (6) wherein each pixel is arranged to support a surface plasmon resonance therein to generate an evanescent electromagnetic field (8) which extends transversely from the pixel so as to be salient from plane of the array for illuminating the sample (7). An optical detector (12) is arranged for detecting optical radiation (9, 10, 11) scattered from the evanescent electromagnetic field (8) by the sample (7). A processing unit (4) arranged to associate the detected optical radiation (9, 10, 11) with the address of the pixel or pixels within the array at which the surface plasmon resonance was generated.