Slot Waveguide Modulator for Low-Power Nonlinear Optics
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Solution Overview
Problem
There is a need for systems and methods that can fully exploit the optical properties of materials with large nonlinear optical characteristics, such as χ2 and χ3 moments, without requiring excessive optical power.
Innovation Solution
The development of an electro-optical modulator with a high index contrast slot waveguide and a cladding material that exhibits enhanced nonlinear optical coefficients, allowing for efficient modulation of optical signals with reduced optical power input, utilizing a substrate with an insulating surface and segmented or winged sections for enhanced light concentration and field enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional waveguide structures are used with materials having large χ2 and χ3 moments, then nonlinear optical effects can be observed, but excessive optical power is required
Solution Approach 1:
The patent applies local quality by creating a slot waveguide structure where the optical field is locally concentrated in a specific region (the slot between high-index stripes). This localized field enhancement allows nonlinear optical effects to be observed at lower overall power levels, resolving the contradiction between power consumption and effectiveness.
Solution Approach 2:
The patent uses composite materials by combining high-index contrast materials (such as silicon stripes) with nonlinear optical materials (polymers exhibiting large χ2 and χ3 moments) in a slot waveguide structure. This composite approach enables both strong field confinement and enhanced nonlinear optical response at reduced power levels.
2Reliability
If optical field is tightly confined in the waveguide, then nonlinear optical effects are enhanced, but device fabrication precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the waveguide into distinct high-index stripes separated by a slot. This segmented structure naturally confines the optical field in the slot region while using standard fabrication techniques, reducing the precision requirements compared to attempting tight confinement in a single continuous waveguide structure.
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
This approach enables the manipulation of light at low power levels, facilitating optical processing and modulation with improved efficiency and reduced power requirements, suitable for applications in nonlinear optics and optical communication systems.
Implementation Method 1
high index contrast slot waveguide... configured to concentrate optical fields
Implementation Method 2
cladding comprising a material that exhibits an enhanced nonlinear optical coefficient... exploit the optical properties of materials that exhibit large χ2 and χ3 moments
Implementation Method 3
electro-optical modulator... electrical signal source configured to apply a modulation signal to the high index contrast slot waveguide
Data Source
AI summary
Systems and methods for manipulating light with high index contrast waveguides clad with substances having that exhibit large nonlinear electro-optic constants χ2 and χ3. Waveguides fabricated on SOI wafers and clad with electro-optic polymers are described. Embodiments of waveguides having slots, electrical contacts, and input waveguide couplers are discussed. Waveguides having closed loop structures (such as rings and ovals) as well as linear or serpentine waveguides, are described. Optical signal processing methods, such as optical rectification and optical modulation, are disclosed. Designs having responsivity of less than 1 volt-centimeter are described.