Hybrid Plasmonic Waveguide Structure for Compact Pockels Modulation
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Solution Overview
Problem
Photonic components using thin film lithium niobate suffer from a large footprint and limited power handling capability.
Innovation Solution
A hybrid plasmonic photonic structure is developed, comprising a waveguide core, a metal layer, and a layer exhibiting an electric-field-induced Pockels effect, which includes a material like lithium niobate, separated by dielectric layers to form a hybrid plasmonic waveguide, enhancing modulation efficiency and reducing footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin film lithium niobate is used in photonic components, then electro-optical performance is improved, but footprint size increases and power handling capability is limited
Solution Approach 1:
The patent employs a composite structure combining metal layers (gold, silver, or aluminum) with dielectric layers (silicon dioxide, silicon nitride, or titanium dioxide) to form a hybrid plasmonic waveguide. This composite approach enables sub-wavelength light confinement while maintaining electro-optical modulation capability, thereby reducing the footprint of photonic components without sacrificing performance
Solution Approach 2:
The invention applies the Pockels effect material (lithium niobate or lithium tantalate) locally in specific regions where electro-optical modulation is required, rather than using it throughout the entire waveguide structure. This localized application reduces the overall footprint while maintaining the necessary electro-optical performance in critical areas
2Reliability
If thin film lithium niobate is used in photonic components, then electro-optical performance is improved, but power handling capability is limited
Solution Approach 1:
The hybrid plasmonic structure combines metal-dielectric composites with Pockels effect materials to create a waveguide that can handle higher optical powers. The metal-dielectric composite provides enhanced light confinement and reduced modal overlap with the nonlinear material, enabling better power handling while maintaining electro-optical modulation efficiency
Solution Approach 2:
The patent modifies the structural parameters of the waveguide, including layer thicknesses (metal layer: 50-200 nm, dielectric layer: 100-500 nm, Pockels effect material layer: 200-1000 nm) and geometric dimensions, to optimize the balance between light confinement, electro-optical interaction strength, and power handling capability. These parameter adjustments enable the structure to withstand higher optical powers without compromising performance
3Area of stationary object
If hybrid plasmonic structure is implemented, then footprint is reduced and light confinement is strengthened, but manufacturing complexity increases
Solution Approach 1:
The patent divides the waveguide structure into distinct segmented layers (metal layer, dielectric layer, Pockels effect material layer) that can be fabricated separately using standard semiconductor processing techniques. This segmentation allows each layer to be optimized and fabricated independently, then assembled into the final hybrid structure, reducing overall manufacturing complexity despite the multi-layer design
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 structure achieves improved modulation efficiency with strengthened light confinement, minimized insertion loss, and lowered propagation loss, while maintaining a compact design.
Implementation Method 1
A hybrid plasmonic photonic structure includes a waveguide core, a metal layer, and a layer exhibiting an electric-field-induced Pockels effect
Implementation Method 2
a second layer that has an overlapping relationship with the first waveguide core and the first layer. The first layer comprises a metal, and the second layer comprising a material that exhibits an electric-field-induced Pockels effect
Data Source
AI summary
Plasmonic photonic structures that include a layer that exhibits an electric-field-induced Pockels effect and methods of forming such structures. The structure comprises a waveguide core on a substrate, a first layer that has an overlapping relationship with the first waveguide core, and a second layer that has an overlapping relationship with the first waveguide core and the first layer. The first layer comprises a metal, and the second layer comprising a material that exhibits an electric-field-induced Pockels effect.