SLM Actuator Frame for Interference Cavity Height Control
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Solution Overview
Problem
Conventional spatial light modulators (SLMs) face limitations in efficiently modulating long wavelengths, such as millimeter-wave and terahertz bands, due to the need for significant mechanical movement, which is power-intensive and restricts frame rates.
Innovation Solution
An interference-based spatial light modulator (SLMI) system that employs electromagnetic interference between semi-reflective surfaces, using actuators to control the separation distance between these surfaces, allowing for small movements to modulate light properties effectively across all wavelengths, particularly at longer wavelengths, enabling high frame rate and low power operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SLMs use large mechanical movements to modulate long wavelengths, then modulation effectiveness is improved, but power consumption increases and frame rate decreases
Solution Approach 1:
The patent replaces the conventional mechanical movement system with an electromagnetic interference-based modulation system. Instead of physically moving mirrors or gratings over large distances to modulate long wavelengths, the invention uses electromagnetic fields to create interference patterns that achieve the same modulation effect with minimal mechanical displacement, thereby reducing power consumption while maintaining modulation effectiveness
Solution Approach 2:
The invention changes the modulation parameter from large mechanical displacement to small mechanical displacement combined with electromagnetic field variation. By using electromagnetic interference, the system achieves wavelength-specific modulation through changes in electromagnetic field parameters rather than relying solely on mechanical movement parameters, enabling efficient long wavelength modulation
2Reliability
If conventional SLMs use large mechanical movements to modulate long wavelengths, then modulation effectiveness is improved, but frame rate decreases
Solution Approach 1:
The patent replaces the conventional mechanical movement system with an electromagnetic interference-based modulation system. Instead of physically moving mirrors or gratings over large distances to modulate long wavelengths, the invention uses electromagnetic fields to create interference patterns that achieve the same modulation effect with minimal mechanical displacement, thereby reducing power consumption while maintaining modulation effectiveness
Solution Approach 2:
The invention employs periodic electromagnetic field modulation to achieve high frame rate operation. By using time-varying electromagnetic fields that oscillate at frequencies matching the desired frame rate, the system can rapidly modulate light without being constrained by mechanical inertia, enabling high-speed operation even for long wavelength modulation
3Ease of operation
If conventional SLMs modulate light using amplitude or phase modulation, then light control is achieved, but independent control of phase and amplitude is restricted
Solution Approach 1:
The patent segments the modulation function into independent phase control and amplitude control channels. By using electromagnetic interference between reference and signal beams, the system can independently adjust the phase of the interference pattern (affecting optical path difference) and the amplitude of the interference (affecting intensity), allowing separate and independent control of both parameters without mechanical coupling
Solution Approach 2:
The invention introduces electromagnetic interference as an intermediary mechanism between the modulator and the light beam. The interference pattern created by combining reference and signal beams serves as a mediator that can independently encode both phase and amplitude information, enabling versatile light control with enhanced adaptability
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
The SLMI system achieves efficient modulation of light intensity and phase with small surface movements, enhancing performance for millimeter-wave and terahertz bands by allowing independent control of phase and amplitude modulation, resulting in high frame rates and low power consumption.
Implementation Method 1
The elongated elements extend from a fixed support structure or may be cantilever beams that are pulled by electric field forces generated by the control signal
Implementation Method 2
An interference-based spatial light modulator (SLMI) system that employs electromagnetic interference between semi-reflective surfaces
Implementation Method 3
Light enters a cavity between at least two of the surfaces and reflects back-and-forth between the surfaces causing constructive and destructive interference within the cavity
Data Source
AI summary
An actuator system can be used to adjust a position of a component in a spatial light modulator. The actuator system has a pair of actuators that are coupled together by a frame that is used to adjust the height of the component relative to the substrate. The frame includes a pair of moment arms that are coupled to the actuators and a pair of connecting arms that are coupled to the moment arms. The connecting arms are then connected together at about the center of the frame, which portion of the frame can be used to raise or lower the plate. The center of the frame can be raised or lowered by a shortening or lengthening of the connecting arms relative to each other.