Solid State Spatial Light Modulator for Millimeter Wave Imaging
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Solution Overview
Problem
Existing spatial light modulators, particularly in millimeter wave imaging, face limitations in achieving high resolution without the need for expensive multi-pixel sensor arrays and struggle with generating Hadamard blocking patterns due to the absence of solid-state spatial millimeter wave modulators, requiring physical masks that complicate the imaging process.
Innovation Solution
A magneto-optic spatial light modulator utilizing an array of selectively magnetizable Faraday domains, which can change the polarization state of electromagnetic waves, addresses these limitations by enabling compressive sampling and supporting a range of frequencies from 10 GHz to 10 THz, including millimeter waves, through an addressing arrangement that controls the magnetization of Faraday domains to create necessary blocking patterns without physical masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-pixel sensor is used with compressive sampling, then cost is reduced, but imaging resolution is degraded
Solution Approach 1:
The imaging function is segmented between the single-pixel sensor and the spatial light modulator. The SLM performs spatial encoding of the scene through Hadamard patterns, while the sensor captures the modulated signal. This segmentation allows a single sensor to effectively capture N×N resolution information through computational reconstruction, resolving the contradiction between using a single sensor and achieving high resolution.
2Adaptability or versatility
If physical masks are used to generate Hadamard blocking patterns, then the blocking patterns can be created, but device complexity increases
Solution Approach 1:
The mechanical system of physical masks is replaced with a solid-state spatial light modulator that uses magnetic fields to control Faraday domains. This substitution eliminates the need for physical mask movement and replacement, allowing electronic control of blocking patterns and significantly reducing device complexity while maintaining the ability to generate Hadamard patterns.
3Device complexity
If solid-state spatial millimeter wave modulators are developed, then device complexity is reduced, but manufacturing difficulty increases
Solution Approach 1:
The invention changes the operating parameters and physical principles of the modulator by using magneto-optic Faraday domains instead of traditional micromechanical or electronic modulators. This parameter change enables solid-state operation at millimeter wave frequencies while using well-established magnetic domain control techniques, making the device both simpler and manufacturable.
4Adaptability or versatility
If Faraday domains are made larger to support longer wavelengths, then wavelength range is extended, but magnetic stability is degraded
Solution Approach 1:
The invention uses composite magnetic domain structures within the Faraday material that maintain stable magnetization states even at larger dimensions required for long wavelength operation. The composite structure allows the Faraday domains to be selectively magnetizable while maintaining magnetic stability, enabling operation at wavelengths longer than the maximum dimensions of individual domains would normally permit.
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 solution enhances millimeter wave imaging by allowing higher resolution imaging with a single-pixel sensor and reduces costs, as it supports longer wavelengths and maintains magnetic stability without external fields, overcoming previous limitations in spatial light modulators.
Implementation Method 1
each Faraday domain being selectively magnetizable to serve as an individual magnetic domain for selectively changing a polarization state of electromagnetic waves
Data Source
AI summary
A spatial light modulator includes an array of Faraday domains with each Faraday domain being selectively magnetizable to serve as an individual magnetic domain for selectively changing a polarization state of electromagnetic waves, having wavelengths that are no greater than a maximum wavelength, passing through each Faraday domain with each Faraday domain being characterized by physical dimensions and each Faraday domain is selectively magnetizable so long as the physical dimensions do not exceed a given maximum set of dimensions that correspond to the maximum wavelength. An addressing arrangement addresses the array of Faraday domains to selectively switch a magnetization state of a group of adjacent ones of the Faraday domains such that the Faraday domains that make up the group of Faraday domains cooperate to selectively change the polarization state of at least one electromagnetic wave passing therethrough having a wavelength that is longer than the maximum wavelength.