Low Resistivity Hybrid Sol-Gel Cladding for Electro-Optic Devices
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Solution Overview
Problem
Electro-optic devices, particularly those using poled hyperpolarizable organic chromophore-based materials, are limited by high resistivity and large optical losses due to conventional cladding materials.
Innovation Solution
A hybrid organic-inorganic material with intrinsically low resistivity is developed by mixing specific sol-gel precursors, including silicon, tin, and antimony, which are hydrolyzed and condensed to form a polymer network with organic and oxide cross-links, enabling electron or hole conduction through jumping mechanisms, reducing electrical resistivity and optical losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional cladding materials are used in electro-optic devices, then the device structure is simple and easy to manufacture, but the electrical resistivity is high and optical losses are large
Solution Approach 1:
The patent employs a hybrid organic-inorganic sol-gel material that combines the benefits of both organic polymers (flexibility, ease of processing) and inorganic oxides (low resistivity, optical stability). This composite approach resolves the contradiction by achieving low optical losses through the inorganic component while maintaining manufacturing ease through the organic component's processing characteristics.
Solution Approach 2:
The invention changes the fundamental material parameters by introducing a sol-gel derived hybrid material with intrinsically low electrical resistivity (10^-3 to 10^-6 ohm·cm) compared to conventional high-resistivity materials. This parameter change directly reduces optical losses while the sol-gel processing methodology maintains ease of manufacture through solution-based fabrication.
2Reliability
If conventional high resistivity cladding materials are used, then the manufacturing process is simple, but the poling voltage required is high and poling efficiency is low
Solution Approach 1:
The patent fundamentally changes the electrical resistivity parameter of the cladding material from high (conventional) to low (10^-3 to 10^-6 ohm·cm) through sol-gel processing. This parameter change enables efficient charge injection and transport during the poling process, dramatically improving poling efficiency while reducing the required poling voltage and energy consumption.
Solution Approach 2:
The invention replaces the electrical insulation function of conventional cladding with an electrically conductive hybrid material that actively facilitates charge transport. This substitution transforms the cladding from a passive insulating layer to an active component that enhances poling efficiency through its inherent electrical conductivity.
3Length of stationary object
If conventional cladding materials are used, then the device structure is straightforward, but the cladding thickness must be limited to maintain acceptable modulation voltage
Solution Approach 1:
The patent changes the electrical conductivity parameter of the cladding material, enabling thicker cladding layers to be used without proportionally increasing modulation voltage. The low-resistivity hybrid material (10^-3 to 10^-6 ohm·cm) allows charge transport through thicker layers, decoupling the relationship between cladding thickness and required power.
Solution Approach 2:
The invention adds the dimension of electrical conductivity to the cladding material design, transforming it from a purely optical component to an electro-optically active layer. This enables the cladding to simultaneously provide optical confinement and electrical conduction, allowing increased thickness for better optical performance without sacrificing electrical efficiency.
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 solution results in reduced poling voltage, increased poling efficiency, thicker cladding without increased modulation voltage, and improved light modulation capabilities, leading to more efficient and compact electro-optic devices with lower propagation losses.
Implementation Method 1
a sol-gel solution including a first sol-gel precursor including at least three hydrolysable groups, a second sol-gel precursor including at least two hydrolysable groups
Implementation Method 2
the first two sol-gel precursors may be mixed and hydrolyzed/condensed together in a Part A
Implementation Method 3
a film may form a hybrid organic-inorganic polymer optical cladding having relatively low electrical resistivity arising from jumping conduction between covalently-bound trap elements
Implementation Method 4
The electron trap element may include tin in a 4+ oxidation state and the electron donor element may be antimony in a 3+ oxidation state
Data Source
AI summary
A low resistivity hybrid organic-inorganic material may include a proportion of charge traps including a trap element indirectly covalently bonded to a donor or acceptor element. The trap element may include tin. The donor or acceptor element may include indium and/or antimony. Bonding includes cross-linking via oxygen bonds and via organic cross-linkers. The material may be formed as a hybrid sol-gel. The material may have optical transmission and refractive index characteristics. The material may be formed as optical cladding proximal to a non-linear optical layer, and may form a portion of a second order nonlinear optical device. The second order nonlinear optical device may include and electro-optic device including an organic chromophore-loaded modulation layer.