Hybrid Spatial Light Modulator for High Space-Bandwidth Performance
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Solution Overview
Problem
Existing spatial light modulators (SLMs) face challenges in achieving high space-bandwidth performance (SBP) due to limitations in power consumption, pixel control complexity, and the need for high refresh rates, especially for applications requiring real-time operation.
Innovation Solution
The integration of energy-efficient photonic integrated circuits (PICs) with meta-optical beam aggregators and small-scale gratings enables low-energy, highly controllable higher order diffraction free images at high resolution, significantly improving SBP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional glass optics systems are used for imaging, then high quality images with minimal aberrations are achieved, but the system size and weight increase significantly
Solution Approach 1:
The patent replaces conventional glass optics (mechanical/refractive system) with a spatial light modulator based on photonic integrated circuits and meta-optical elements. This substitution eliminates bulky glass lenses and mirrors while achieving the same wavefront manipulation function through programmable phase modulation, thereby reducing system weight and size while maintaining image quality.
2Measurement precision
If individual control mechanisms are implemented for each pixel in SLM, then high resolution images are achieved, but power requirements and control complexity scale up with the number of pixels
Solution Approach 1:
The patent segments the pixel control into groups or blocks, where adjacent pixels are controlled collectively rather than individually. This segmentation reduces the number of control signals required from O(N²) to a smaller number, thereby reducing power consumption and control complexity while maintaining the ability to generate high-resolution images through the aggregated control of pixel groups.
3Speed
If high refresh rates are achieved for real-time operation, then dynamic applications are enabled, but power consumption and control signal complexity increase
Solution Approach 1:
The patent implements time-division multiplexing by dividing the pixel array into groups that are controlled in sequential time slots. This segmentation in time domain allows high refresh rates to be achieved with fewer control signals, as each group is updated at different time intervals rather than requiring all pixels to be updated simultaneously at full refresh rate.
Solution Approach 2:
The patent employs periodic updating of pixel groups in a cyclic manner, where different groups are updated at different periods. This periodic action enables the system to maintain high effective refresh rates for dynamic applications while reducing the instantaneous control signal bandwidth requirements, thereby simplifying control signal wiring and reducing power consumption.
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 hybrid approach achieves a theoretical SBP of up to 1013 Hz·pixel, several orders of magnitude higher than conventional technologies, while reducing power consumption and complexity of control signal wiring.
Implementation Method 1
Each pixel of the pixel array is capable of individually controlling a phase of light waves that pass through the pixel
Implementation Method 2
combining meta-optics with photonic integrated circuits
Implementation Method 3
combining meta-optics with photonic integrated circuits to achieve low-energy, highly controllable higher order diffraction free images
Data Source
AI summary
Spatial light modulators and associated methods are described. In one embodiment, a spatial light modulator includes a photonic integrated circuit configured for emitting a plurality of light beams as a first waveform by a plurality of pixels. The light beams are individually controllable. The spatial light modulator also includes a meta-optic having a plurality of nanostructures configured for receiving the first waveform and aggregating the plurality of light beams as a second waveform at a surface of the meta-optic. The spatial light modulator also includes an aperture array configured for converting the second waveform into a third waveform, where the third waveform is smaller than the second waveform.