Addressable Plasmonic Array Imaging for Sub-Diffraction Resolution
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Solution Overview
Problem
Conventional optical microscopes are limited by the diffraction limit, making it difficult to achieve sub-wavelength resolution without using vacuum technologies or high-energy radiation, which can alter or damage biological samples.
Innovation Solution
An imaging apparatus utilizing an addressable plasmonic array that generates surface plasmons through various excitation methods, allowing for sub-diffraction limited imaging without the need for vacuum conditions or high-energy radiation, and enables video-rate imaging of nano-scale processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical microscopy is used, then image contrast and acquisition speed are maintained, but spatial resolution is limited by the diffraction limit to ~200nm
Solution Approach 1:
The patent changes the physical parameter of light-matter interaction by utilizing surface plasmon resonances instead of conventional optical focusing. This enables sub-diffraction limited resolution (below 200nm) while maintaining sample integrity through non-ionizing, non-vacuum optical excitation at the metal-dielectric interface
Solution Approach 2:
The patent introduces a metal surface (gold or silver) as an intermediary between the light source and the sample. This metal surface supports surface plasmons that generate evanescent electromagnetic fields, enabling super-resolution imaging without direct contact with the sample and without requiring vacuum conditions
2Measurement precision
If scanning near-field techniques are used, then sub-wavelength resolution is achieved, but imaging speed is slow due to the requirement of very close proximity scanning
Solution Approach 1:
The patent replaces the mechanical scanning system (physical probe movement) with an optical field-based approach. Surface plasmons are excited across the entire metal surface simultaneously, eliminating the need for slow mechanical scanning and enabling parallel acquisition of sub-diffraction limited information
3Measurement precision
If electron microscopy or ion techniques are used, then diffraction limit is surpassed, but vacuum technologies and high equipment cost are required
Solution Approach 1:
The patent uses a metal-dielectric interface as an intermediary to generate evanescent electromagnetic fields that can resolve sub-wavelength structures. This optical intermediary approach avoids the need for complex vacuum systems, electron optics, and ion sources, simplifying the overall system while achieving super-resolution
Solution Approach 2:
The patent changes the operating conditions from vacuum-based electron/ion beams to ambient-condition optical fields. By utilizing surface plasmon resonances in metal films, the system achieves electron-microscopy-level resolution under simple atmospheric conditions with standard optical equipment
4Measurement precision
If high laser power is used to achieve sub-diffraction limited imaging, then spatial resolution is improved, but sample damage and photobleaching increase
Solution Approach 1:
The patent creates highly localized evanescent electromagnetic fields at the metal surface where surface plasmons are excited. These concentrated fields provide sub-diffraction limited resolution with low overall laser power, preventing sample damage and photobleaching while achieving super-resolution imaging
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 apparatus achieves high spatial resolution and contrast with low laser power, suitable for biological samples, while maintaining the sample's integrity and enabling fast imaging without the need for sample labeling or vacuum environments.
Implementation Method 1
Each pixel of the array of pixels is arranged to support a surface plasmon upon its surface and in doing so to generate an evanescent electromagnetic field
Implementation Method 2
generate an evanescent electromagnetic field which extends transversely from the pixel so as to be salient from the plane of the array of pixels
Data Source
Figure 1A
Figure 1B~1D
Figure 1E
AI summary
An imaging apparatus for imaging a sample (7) comprises 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. This field extends transversely from the pixel so as to be salient from the array at a first side of the array for illuminating the sample at said first side. A light source (15) is arranged to illuminate the array with excitation light therewith to generate said surface plasmon resonance. An optical detector (12A, 12B, 12C) is arranged at a second side of the array which is opposite to said first side of the array for detecting optical radiation returned from the array in response to illumination of the array by said excitation light. A processing unit (4) is arranged to associate the detected optical radiation with the address of the pixel or pixels within the array at which the surface plasmon resonance was generated.