Segmented Birefringent Phase Plate for Achromatic Wavefront Shaping
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Solution Overview
Problem
Existing easySTED phase plates are only effective over small wavelength ranges and are unsuitable for shaping light beams that do not differ in wavelength but in intensity, such as in RESOLFT fluorescence light microscopy, and previous concepts are vague or impractical for reworking.
Innovation Solution
A device with birefringent optical material that differentially delays the phase of a first light beam in multiple subregions, while keeping the phase of a second light beam unchanged, regardless of wavelength, by using a segmented phase plate design with aligned crystal axes and achromatic birefringent material, allowing for selective phase front shaping without affecting the fluorescence excitation light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wavelength- or polarization-sensitive optical setup (easySTED phase plate) is used to deform phase fronts of fluorescence suppression light, then selective phase front distortion is achieved, but the device is only effective over small wavelength ranges and unsuitable for beams differing in intensity rather than wavelength
Solution Approach 1:
The optical component is divided into multiple sub-regions (at least three) around the optical axis, with each sub-region having different birefringent properties. This segmentation allows different phase delays to be applied to different parts of the light beam, enabling precise phase front shaping while maintaining broad wavelength applicability through achromatic birefringent materials
Solution Approach 2:
The patent uses achromatic birefringent materials that maintain their optical properties across a broad wavelength range. By changing the birefringent parameters (phase delays) in different sub-regions while using materials with stable properties across wavelengths, the device achieves both precise phase control and broad spectral versatility, resolving the contradiction between precision and adaptability
2Measurement precision
If a segmented chromatic λ/2 plate with different fast axis orientations is used to shape polarization distribution, then phase fronts of fluorescence suppression light are distorted, but the setup is complex and only works for specific wavelength combinations
Solution Approach 1:
The optical component is segmented into multiple sub-regions with different birefringent properties. Each segment introduces a specific phase delay for light with polarization parallel to the extraordinary axis, while leaving light with orthogonal polarization unaffected. This segmentation achieves precise phase control with a single integrated component rather than multiple separate elements
Solution Approach 2:
The optical component serves multiple functions simultaneously: it acts as a wave plate for different polarization components, introduces spatially varying phase delays, and works across broad wavelength ranges using achromatic materials. This multi-functionality reduces overall system complexity by replacing multiple specialized components with a single versatile element
3Adaptability or versatility
If previous easySTED phase plate concepts are reworked to handle beams differing in intensity, then the concepts become vague or impractical
Solution Approach 1:
Different sub-regions of the optical component have locally optimized birefringent properties tailored to their specific function in phase front shaping. Each sub-region's properties are independently designed and can be precisely controlled, making the overall system both versatile for different applications and straightforward to implement with clear design criteria for each local region
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 effective shaping of phase fronts for fluorescence prevention light while maintaining the intensity maximum of fluorescence excitation light, achieving a punctiform intensity minimum surrounded by maxima, and is independent of light beam wavelengths, suitable for various microscopy techniques like STED and RESOLFT.
Implementation Method 1
The invention relates to a device for selectively shaping the phase fronts of a first incident light beam... the device comprises birefringent optical material... delays a first phase of the first light beam differently in at least three different sub-regions of the device, while it does not delay a second phase of a second incident light beam
Data Source
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AI summary
An apparatus (1) has birefringent optical material (14-17, 26, 33) for selectively shaping phase fronts of a first light beam (57) that is incident along an optical axis (11) and that has a first input polarization direction extending linearly and orthogonally to the optical axis (11). The apparatus (1) delays a first phase of the first light beam (57) to a different extent in at least three different portions (3-6) of the apparatus (1) and said apparatus does not delay a second phase of a second light beam (58) that is incident along the optical axis (11) and that has a second input polarization direction orthogonal to the first linear input polarization direction and to the optical axis (11) to a different extent in the various portions (3-6). The different portions (3-6) follow one another in a direction (12) around the optical axis (11), with the birefringent optical material (14-17, 26, 33) being arranged in all, or in all bar one, of the different portions (3-6). The birefringent optical material (14-17, 26, 33) delays the first light beam (57) with the first input polarization direction in respect of the phase thereof to an extent that increases from portion (3-6) to portion (3-6) over one rotation of the optical axis (11) in the direction (12).