Electrowetting Optical Shutter for Wavelength Selective Filtering
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Solution Overview
Problem
Existing optical devices lack the ability to selectively control the passage of different wavelength bands of electromagnetic radiation, such as visible light, ultraviolet (UV) light, and infrared (IR) light, without physical movement, which limits their functionality in applications requiring wavelength-specific filtering or shuttering.
Innovation Solution
An optical device comprising a cavity with two immiscible liquids, where a common electrode and a driving electrode are used to adjust the liquid interface via electrowetting, allowing the device to block or pass specific wavelength bands by altering the voltage differential, thereby functioning as a wavelength selective optical shutter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical shutters are used to block specific wavelength bands, then wavelength selectivity is achieved, but mechanical movement is required which reduces reliability and increases complexity
Solution Approach 1:
The patent replaces mechanical shutters with an electrowetting-based liquid interface system. Two immiscible liquids with different optical properties are used, and their interface position is controlled by applying voltage between electrodes, eliminating all mechanical moving parts while achieving wavelength-selective blocking.
Solution Approach 2:
The patent changes the electrical parameter (voltage differential between electrodes) to control the position of the liquid-liquid interface. By varying the voltage, the interface moves between positions that block different wavelength bands, enabling dynamic wavelength selection without mechanical movement.
2Adaptability or versatility
If multiple separate filters are used for different wavelength bands, then comprehensive wavelength control is achieved, but device complexity and size increase
Solution Approach 1:
The patent uses a single optical device containing two immiscible liquids that can perform multiple wavelength-selective blocking functions. By moving the liquid interface to different positions, the same device can block UV, visible, or IR wavelengths, replacing what would traditionally require multiple separate filters.
Solution Approach 2:
The patent nests multiple functional capabilities within a single integrated structure. The cavity contains two liquids with different optical properties, and their interface can be positioned to provide different filtering functions, effectively nesting multiple filter functions within one device.
3Adaptability or versatility
If physical movement is used to change optical path, then wavelength selection is achieved, but speed and response time are reduced
Solution Approach 1:
The patent substitutes electrical actuation for mechanical movement. The liquid interface responds to voltage changes almost instantaneously, achieving wavelength selection at electrical speeds rather than mechanical speeds, thereby dramatically increasing response time.
4Manufacturing precision
If fixed optical filters are used, then manufacturing precision is maintained, but adaptability to different wavelength requirements is reduced
Solution Approach 1:
The patent transforms a static optical filter into a dynamic system. The liquid interface can be moved to different positions within the cavity through electrical control, allowing the same precisely-manufactured device to adapt to different wavelength selection requirements without requiring multiple fixed filters.
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 precise control over the transmission of visible light, UV light, and IR light, allowing the device to act as a selective optical shutter without physical movement, enhancing its applications in imaging and sensing technologies.
Implementation Method 1
Varying the electric field to which the liquids are subjected can vary the wettability of one of the liquids with respect to the chamber wall, thereby varying the shape of the meniscus formed between the two liquids
Implementation Method 2
The first liquid can be attenuating of electromagnetic radiation within a first wavelength band. The second liquid can be attenuating of electromagnetic radiation within a second wavelength band that is different than the first wavelength band
Implementation Method 3
adjusting a voltage differential between the common electrode and the driving electrode can cause movement of the liquid interface between (a) a first position in which the optical device blocks each of a first portion of the image radiation falling within the first wavelength band and a second portion of the image radiation falling within the second wavelength band or passes each of the first portion of the image radiation falling within the first wavelength band and the second portion of the image radiation falling within the second wavelength band
Data Source
AI summary
A selective optical shutter can include a first window, a second window, and a cavity disposed between the first window and the second window. A filter can be disposed in an optical path of the optical shutter, whereby the filter blocks of one of ultraviolet (UV) light or infrared (IR) light and passes each of visible light and the other of UV light or IR light. A first liquid and a second liquid can be disposed within the cavity. The first liquid and the second liquid can be substantially immiscible with each other, whereby a liquid interface is formed between the first liquid and the second liquid. The liquid interface can be adjustable by electrowetting to selectively pass visible light or the other of UV light or IR light.