Light-field pixel wavefront detection via intensity normalization
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Solution Overview
Problem
Conventional microscopy techniques, such as phase contrast and DIC microscopy, face challenges in isolating phase information from amplitude information, leading to mixed signals and the inability to provide quantitative phase measurements, and advanced methods require complex optical elements and coherent light sources.
Innovation Solution
A light-field pixel system with an aperture layer containing non-conventional and conventional apertures, where the non-conventional apertures have a higher gradient of transmission at normal incidence, allows for the normalization of light intensities to isolate phase gradients, enabling the detection of wavefronts using a CMOS image sensor array without bulky optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase contrast or DIC microscopy is used to detect optical phase, then phase information can be obtained, but the phase information is inextricably mixed with amplitude information and quantitative phase measurements cannot be provided
Solution Approach 1:
The patent segments the detection of phase and amplitude information by using multiple apertures with different transmission gradients. Each aperture captures a specific component of the light field, allowing separate measurement of phase gradients and amplitude information that can be processed independently to achieve quantitative phase imaging.
Solution Approach 2:
Different apertures are designed with specific local properties (different transmission gradients) to capture different aspects of the wavefront. This local differentiation enables selective measurement of phase information while maintaining amplitude information separately, resolving the mixing problem in conventional microscopy.
2Measurement precision
If advanced full field quantitative phase imaging techniques are used, then quantitative phase information can be provided, but complex optical elements and coherent light sources are required
Solution Approach 1:
The patent extracts the essential function of wavefront sensing from complex optical interferometry systems by using simple aperture masks with conventional incoherent light sources. This extraction maintains quantitative phase measurement capability while eliminating the need for complex optical elements and coherent light sources.
Solution Approach 2:
The invention replaces expensive, complex optical components (interferometers, coherent lasers, polarizers) with simple, inexpensive aperture masks that can be fabricated using standard semiconductor manufacturing techniques, dramatically reducing system cost and complexity while maintaining measurement capability.
3Device complexity
If conventional apertures are used in the aperture layer, then the structure is simple, but the gradient of transmission at normal incidence is close to zero
Solution Approach 1:
The patent introduces asymmetric aperture designs where the aperture shapes and orientations are specifically engineered to create non-zero transmission gradients at normal incidence. This asymmetry in aperture geometry enables the detection of phase gradients while maintaining structural simplicity suitable for standard manufacturing processes.
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 enables robust, cost-effective, and simple wavefront detection with high spatial sampling, capable of generating artifact-free phase gradient and intensity images using ordinary illumination, without the need for polarized light, and can be integrated into standard sensor chips.
Implementation Method 1
The aperture layer includes a conventional aperture and a non-conventional aperture. The non-conventional aperture is designed to generate a higher gradient of transmission at normal incidence than the conventional aperture.
Implementation Method 2
The light detector layer is configured to measure a first intensity of light through the non-conventional aperture and a second intensity of light through the conventional aperture.
Data Source
AI summary
A light-field pixel for detecting a wavefront, the light-field pixel comprises an aperture layer, a light detector layer, and a processor. The aperture layer has a non-conventional aperture and a non-conventional aperture. The non-conventional aperture has a higher gradient of transmission at normal incidence than the conventional aperture. The light detector is configured to measure a first intensity of light through the non-conventional aperture and a second intensity of light through the conventional aperture. The processor is configured to detect the wavefront based on the first intensity normalized by the second intensity.