Superoscillatory Interferometry for Nanoscale Metrology
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Solution Overview
Problem
Conventional imaging and metrology techniques are limited by the diffraction limit, making it difficult to achieve nanoscale resolution, especially in applications like smart manufacturing and biological studies, where techniques like STED and SML require intense beams that can cause damage and require fluorescent labels, and cannot be applied to solid nanostructures.
Innovation Solution
The method involves generating an interferometric superoscillatory field using coherent electromagnetic radiation, which creates an interference pattern between a reference field and a superoscillatory field, allowing for the detection of intensity distributions and local wavevector distributions to determine displacement, enabling sub-diffraction limit imaging and metrology without the need for near-field sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging techniques are used, then the system is simple and easy to operate, but the spatial resolution is limited to around half the wavelength of light due to the diffraction limit
Solution Approach 1:
The patent introduces an interferometric setup as an intermediary system that combines a reference field with the superoscillatory field. This interferometric mediation enables the detection of sub-diffraction features by encoding them in phase information, resolving the contradiction between achieving high spatial resolution and maintaining system simplicity
Solution Approach 2:
The patent changes the parameter of local wavevector distribution by generating superoscillatory fields with locally enhanced wavevectors that exceed the diffraction limit. This parameter change allows the system to achieve sub-diffraction spatial resolution without requiring complex near-field sensors or intense depletion beams
2Measurement precision
If near-field techniques such as contact photography or scanning near-field microscopy are used, then nanoscale resolution is achieved, but the sensor must be in immediate proximity of the object which severely limits application
Solution Approach 1:
The interferometric field acts as an intermediary that carries sub-diffraction information from the object to the detector without requiring physical contact. The reference field mediates the transfer of phase information, enabling far-field detection of nanoscale features and thus expanding application versatility to include samples that cannot tolerate near-field probes
Solution Approach 2:
The patent replaces the mechanical near-field probe system with an optical interferometric system. Instead of physically contacting the object with a near-field sensor, the system uses optical fields to probe and detect sub-diffraction features, eliminating the need for mechanical proximity and greatly expanding adaptability to various sample types including living cells and solid nanostructures
3Measurement precision
If STED or SML microscopy techniques are used, then super-resolution imaging is achieved, but intense beams cause phototoxicity damage to living samples
Solution Approach 1:
The patent substitutes the intense beam-based STED depletion mechanism with an interferometric detection mechanism. Instead of using high-intensity depletion beams that cause phototoxicity, the system uses coherent interference between reference and superoscillatory fields to achieve sub-diffraction resolution, eliminating the harmful phototoxic effects while maintaining super-resolution capability
Solution Approach 2:
The reference field serves as a mediator that enables detection of sub-diffraction features without requiring intense local fields. The interferometric combination of reference and object fields allows extraction of phase information that encodes sub-diffraction spatial details, achieving super-resolution imaging without the phototoxicity associated with intense STED beams
4Measurement precision
If STED or SML techniques are used, then nanoscale imaging is achieved, but fluorescent labels are required which change the behaviour of the molecules being studied
Solution Approach 1:
The patent extracts and eliminates the requirement for fluorescent labels from the imaging system. By using interferometric detection of superoscillatory fields, the system directly probes the optical properties of the sample without requiring genetic modification or antibody labeling, thus preserving the natural behavior and properties of the molecules being studied while maintaining nanoscale imaging capability
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 provides enhanced resolution beyond the Abbe-Rayleigh diffraction limit, enabling contactless nanoscale metrology with improved stability and applicability to various materials, including solid nanostructures, without causing damage or requiring fluorescent labels.
Implementation Method 1
generating an interferometric superoscillatory field from coherent electromagnetic radiation, the interferometric superoscillatory field comprising an interference pattern between a reference field and a superoscillatory field
Data Source
AI summary
A method of determining a displacement comprises: generating an interferometric superoscillatory field from coherent electromagnetic radiation, the interferometric superoscillatory field comprising an interference pattern between a reference field and a superoscillatory field; detecting with a detector a first set of intensity distributions of the interferometric superoscillatory field, each intensity distribution from a different polarisation state of the electromagnetic radiation; detecting with the detector a second set of intensity distributions of the interferometric superoscillatory field, each intensity distribution from the same polarisation states of the electromagnetic radiation as the first set of intensity distributions; extracting a first local wavevector distribution from the first set of intensity distributions and a second local wavevector distribution from the second set of intensity distributions; comparing the first local wavevector distribution and the second local wavevector distribution to identify any change in position of one or more features in the local wavevector distributions; and ascertaining that a lateral displacement has occurred between the interferometric superoscillatory field and the detector if a change in position is identified.