Multi-layer Spatial Light Modulator Independent Phase Amplitude Control
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Solution Overview
Problem
Conventional spatial light modulators primarily function as intensity modulators, with phase modulation often occurring inadvertently and not independently of intensity modulation, limiting their application in advanced optical control scenarios such as holographic displays and recording.
Innovation Solution
A multi-layer spatial light modulator device with deformable upper and lower planar areas, supported by respective structures, allows for independent control of amplitude and phase modulation by adjusting the relative displacement of these layers, enabling precise control of optical path length differences for constructive or destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional spatial light modulator is used for intensity modulation, then intensity control is achieved, but phase modulation cannot be independently controlled
Solution Approach 1:
The spatial light modulator is segmented into two independent layers: a first layer for phase modulation and a second layer for amplitude modulation. Each layer can be controlled independently through separate electrode structures, allowing phase and amplitude to be modulated without interfering with each other. This segmentation resolves the contradiction by enabling independent phase control while maintaining operational simplicity.
Solution Approach 2:
The invention transitions from a single-layer two-dimensional structure to a multi-layer three-dimensional structure. By adding the vertical dimension with stacked layers, the device achieves independent phase and amplitude control capabilities that are not possible in a conventional single-layer configuration, thus resolving the contradiction between operational capability and structural complexity.
2Loss of energy
If intensity modulation is performed in a conventional SLM, then light intensity is controlled, but optical efficiency is reduced due to unwanted phase modulation
Solution Approach 1:
By separating the modulation functions into distinct layers - phase modulation in the first layer and amplitude modulation in the second layer - the system eliminates unwanted phase modulation during intensity control operations. This segmentation allows pure amplitude modulation without parasitic phase effects, improving optical efficiency while maintaining full intensity modulation capability.
3Adaptability or versatility
If a multi-layer structure is implemented for independent phase and amplitude control, then modulation capability is improved, but device complexity increases
Solution Approach 1:
The multi-layer structure is segmented into functionally distinct layers with dedicated electrode structures for each modulation type. This functional segmentation provides versatile modulation capability for holographic displays and optical control applications while organizing the complexity into manageable, independent modules that can be controlled separately.
Solution Approach 2:
The multi-layer spatial light modulator achieves multi-functionality by integrating both phase and amplitude modulation capabilities in a single device. The first layer handles phase modulation and the second layer handles amplitude modulation, allowing the device to perform multiple modulation functions simultaneously, thereby improving adaptability for various optical applications.
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
Enables independent modulation of phase and amplitude of incident light, enhancing the device's capability for holographic displays and other applications by providing a means to control both parameters separately, thereby improving optical efficiency and reducing polarization dependence.
Implementation Method 1
The GLVTM device switches and modulates light intensities via diffraction. By deflecting alternate ribbons of a GLVTM pixel, the incident light may be controllably diffracted from the GLVTM pixel.
Implementation Method 2
When the ribbons of a GLVTM pixel are co-planar, incident light becomes specularly reflected (like a mirror) from the GLVTM pixel.
Implementation Method 3
enabling precise control of optical path length differences for constructive or destructive interference
Data Source
AI summary
One embodiment relates to a method of independently controlling amplitude and phase modulation by a spatial light modulator. Light is illuminated onto upper layer deflectable planar areas and lower layer deflectable planar areas over a substrate of the spatial light modulator. First active circuitry on the substrate is used to provide amplitude modulation by controlling a relative displacement between upper layer deflectable planar areas and adjacent lower layer deflectable planar areas. Second active circuitry on the substrate is used to provide phase modulation by controlling a displacement between the (upper and lower layer) deflectable planar areas and the substrate. Other embodiments and features are also disclosed.