Aperture-Metasurface Imaging for Telecentric Wide-Field Optics
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Solution Overview
Problem
Conventional imaging systems require multiple optical elements to achieve telecentricity and control of chief ray angle (CRA) over a large field of view, leading to complex designs and issues like pixel crosstalk and distortion.
Innovation Solution
Integration of a single aperture with a metasurface element in an optical system, which imparts phase shifts to light, allowing for telecentricity and controlled CRA without multiple elements, using nanostructured metasurface layers and optional refractive lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple optical elements are used to achieve telecentricity and control chief ray angle, then imaging quality over large field of view is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions (telecentricity control, chief ray angle control, and imaging) into a single metasurface element. This metasurface integrates the functionality of what would traditionally require multiple separate optical elements, thereby reducing device complexity while maintaining imaging quality over a large field of view.
Solution Approach 2:
The patent uses metasurface technology to achieve telecentricity and chief ray angle control through phase modulation parameters rather than through multiple physical optical elements. By controlling the local phase shift parameters across the metasurface, the system achieves the desired optical performance with a single element.
2Manufacturing precision
If multiple optical elements are used to control chief ray angle, then distortion is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent integrates distortion control functionality into the single metasurface element along with telecentricity and chief ray angle control. This unified approach simplifies manufacturing compared to assembling and aligning multiple separate optical elements, each requiring precise manufacturing tolerances.
Solution Approach 2:
The patent replaces the mechanical assembly of multiple optical elements with a single metasurface structure that achieves the same optical effects through nanoscale phase modulation. This substitution eliminates the need for complex mechanical alignment and assembly processes.
3Length of stationary object
If conventional refractive optics are used, then thickness is sufficient for light shaping, but the system becomes bulky compared to metasurface
Solution Approach 1:
The patent replaces conventional thick refractive optics with a thin metasurface structure that achieves the same light shaping functionality. The metasurface operates in the near-field regime, allowing for subwavelength thickness while maintaining effective optical control, thereby dramatically reducing system volume.
Solution Approach 2:
The patent changes the operational regime from far-field refractive optics to near-field metasurface optics, enabling ultra-thin optical elements. By operating in the near-field and using subwavelength structured elements, the system achieves effective light control with minimal thickness.
4Ease of manufacture
If binary diffractive optics are used, then manufacturing is simpler, but phase control is limited to two values
Solution Approach 1:
The patent uses composite metasurface structures that combine multiple materials or geometric configurations to achieve continuous phase control. By varying the geometry, material composition, or both of the metasurface elements, the system can impart any phase shift value between 0 and 2π, providing full adaptability while maintaining manufacturability through standard fabrication 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
Achieves high-quality imaging over a large field of view with uniform illumination and reduced distortion, simplifying design and fabrication, and minimizing pixel crosstalk.
Implementation Method 1
metasurface elements abruptly introduce phase shifts onto light field
Implementation Method 2
Metasurface elements are diffractive optics in which individual waveguide elements have subwavelength spacing
Implementation Method 3
the aperture and the metasurface layer are configured to gather light of a specified operational bandwidth across a specified field of view and shift the incoming light such that it comes to a focus on the at least one image sensor at a zero or near-zero degree chief ray angle
Data Source
AI summary
Hybrid imaging systems incorporating conventional optical elements and metasurface elements with light sources and/or detectors, and methods of the manufacture and operation of such optical arrangements are provided. Systems and methods describe the integration of apertures with metasurface elements and refractive optics with metasurface elements in illumination sources and sensors.