Fourier Ptychography Light Source With Angle-Dependent Optical Bandwidth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Fourier ptychography microscopy systems using coherent light sources emit monochromatic light, limiting the final image to a narrow spectrum of wavelengths and reducing the captured information.
Innovation Solution
A light source comprising a plurality of light-emitting elements configured to emit light with varying optical bandwidths and illumination angles, allowing for broader wavelength capture and phase information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If coherent light sources are used to illuminate the sample, then the illumination intensity and coherence required for Fourier ptychography is achieved, but the optical bandwidth becomes narrow and wavelength information is limited
Solution Approach 1:
The light source is segmented into multiple light-emitting elements, each configured to emit light at a specific illumination angle with a broader optical bandwidth than conventional coherent sources. This segmentation allows simultaneous achievement of high illumination intensity at each angle while maintaining broader spectral content across the entire light source array.
Solution Approach 2:
The patent changes the key parameter of optical bandwidth by using light-emitting elements that emit light with a broader spectral range compared to traditional coherent light sources. This parameter change enables the system to capture both wavelength information and phase information simultaneously, resolving the contradiction between intensity and bandwidth.
2Reliability
If monochromatic light is used for illumination, then coherent illumination is achieved, but the captured information is limited to a narrow spectrum of wavelengths
Solution Approach 1:
Rather than using a single monochromatic source, the patent segments the illumination into multiple light-emitting elements, each providing coherent illumination at its specific angle but with broader spectral content. This segmentation maintains the reliability of coherent illumination while reducing information loss across the wavelength spectrum.
Solution Approach 2:
The light source functions as a composite system combining multiple light-emitting elements with different spectral characteristics and illumination angles. This composite approach maintains the beneficial effects of coherent illumination while expanding the overall optical bandwidth and preserving both wavelength and phase information.
3Device complexity
If a single light-emitting element is used, then the device complexity is low, but the field-of-view and resolution are limited
Solution Approach 1:
The light source is divided into multiple light-emitting elements arranged to provide illumination from different angles. This segmentation enables the system to achieve a wider field-of-view and higher resolution by synthesizing information from multiple illumination angles, while keeping each individual element relatively simple in design.
Solution Approach 2:
Each light-emitting element in the array serves multiple functions: providing coherent illumination at a specific angle, contributing to both wavelength and phase information capture, and enabling synthetic aperture imaging. This multi-functionality allows the system to achieve enhanced performance without proportionally increasing overall device complexity.
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
The present inventive concept relates to a light source for a Fourier ptychography microscopy system, a Fourier ptychography microscopy system, and a method for capturing a set of digital images. The light source comprises a plurality of light-emitting elements (100), each light-emitting element configured to illuminate an illumination position (P) at one (1120) of a plurality of illumination angles (110), the plurality of illumination angles (110) comprising a first range of illumination angles (112) and a second range of illumination angles (114) different from the first range of illumination angles (112), wherein the plurality of light-emitting elements (100) comprises: a first set of light-emitting elements (102) consisting of light-emitting elements (1020) configured to emit light having a first optical bandwidth, and a second set of light-emitting elements (104) comprising light-emitting elements (1040, 1042, 1044) configured to emit light having a second optical bandwidth narrower than the first optical bandwidth; and wherein a majority of light-emitting elements configured to illuminate the illumination position (P) at illumination angles (1120) of the first range of illumination angles (112) belong to the first set of light-emitting elements (102), and a majority of light-emitting elements configured to illuminate the illumination position (P) at illumination angles (1140) of the second range of illumination angles (114) belong to the second set of light-emitting elements (104).