Nanodisordered KTN Electro-Optic Modulator for High-Speed Wide FOV
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Solution Overview
Problem
Current electro-optic modulators, particularly those using linear crystals like lithium niobate, are not suitable for high-speed, large field-of-view applications due to birefringence, and while quadratic materials like PLZT offer large aperture and view, their speed is limited by domain wall movement, necessitating the development of non-waveguide based, high-speed, broadband modulators with reduced driving power.
Innovation Solution
Employing nanodisordered potassium tantalate niobate crystals with proper thermal cycling to enhance the quadratic electro-optic coefficient, reducing driving energy and power by preventing polar-nano region growth, thus enabling high-speed modulation with lower voltages and increased aperture size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If linear EO crystals like lithium niobate are used, then high-speed modulation is achieved, but birefringence limits large field-of-view capability
Solution Approach 1:
The patent changes the fundamental material parameter from linear EO effect to quadratic EO effect, and specifically uses nanodisordered KTN crystal structure to achieve both high-speed modulation and large field-of-view capability simultaneously, resolving the contradiction between speed and adaptability
2Area of stationary object
If quadratic EO materials like PLZT are used, then large aperture and field of view are achieved, but speed is limited to MHz range due to multiple domains
Solution Approach 1:
The patent changes the crystal structure parameter from multi-domain ceramic (PLZT) to nanodisordered single crystal (KTN), eliminating domain wall movement limitations and enabling GHz-range modulation speeds while maintaining large aperture capability
Solution Approach 2:
The patent uses composite material approach by combining KTN crystal with specific thermal cycling treatment to create nanodisordered structure, achieving both large aperture and high-speed performance
3Power
If conventional EO modulators are used, then modulation function is achieved, but driving power requirements are high
Solution Approach 1:
The patent changes the material's electro-optic coefficient parameter through nanodisordered structure, which enhances the quadratic EO effect and reduces the driving voltage and power requirements for achieving the same modulation function
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 approach results in a modulator with significantly reduced driving power, enhanced modulation speed, and increased aperture size, addressing the limitations of existing technologies by achieving GHz range operation with lower voltages and reduced light scattering.
Implementation Method 1
nanodisordered potassium tantalate niobate crystal... whereby light is intensity or phase modulated through the nanodisordered potassium tantalate niobate crystal in accordance with the voltage produced by the drive circuitry
Data Source
AI summary
An electro-optic modulator comprising at least one nanodisordered potassium tantalate niobate crystal; first and second conductors operatively connected to the nanodisordered potassium tantalate niobate crystal adapted to be connected to a voltage source to modulate light passing there through; whereby light is modulated by passing through the nanodisordered potassium tantalate niobate crystal. A method for modulating light comprising providing at least one at least one nanodisordered potassium tantalate niobate crystal; providing first and second conductors operatively connected to the nanodisordered potassium tantalate niobate crystal adapted to be connected to a voltage source to modulate light passing there through; providing an interrogating light beam striking at least one nanodisordered potassium tantalate niobate crystal; modulating light passing through the nanodisordered potassium tantalate niobate crystal; and receiving a modulated light beam.