III-Nitride Modulators on Silicon Nitride Waveguides
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Solution Overview
Problem
Existing silicon photonics platforms are limited in their ability to operate in the visible range due to silicon's absorptivity, and they lack active components like high-speed electro-optic modulators.
Innovation Solution
The integration of III-nitride photonic materials on a silicon nitride photonics platform, which includes forming electro-optic modulators using III-nitride waveguide structures bonded to silicon nitride waveguides, enabling active components on a passive silicon nitride waveguide circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If silicon waveguides are used for photonic integrated circuits, then the platform is compatible with silicon photonics technology, but the circuit cannot operate in the visible range due to silicon absorptivity
Solution Approach 1:
The photonic integrated circuit is segmented into distinct functional regions: silicon nitride waveguides for visible range transmission and III-nitride quantum well modulators for electro-optic modulation. This segmentation allows each material to operate in its optimal wavelength range without the harmful absorptivity effects of silicon.
Solution Approach 2:
The invention uses composite material structures combining silicon nitride and III-nitride materials on a silicon platform. The silicon nitride provides visible range transparency while the III-nitride layers provide active modulation functionality, creating a composite system that overcomes the limitations of pure silicon waveguides.
2Object-affected harmful factors
If silicon nitride waveguides are used, then the circuit is transparent in the visible range, but active components such as electro-optic modulators cannot be made with this passive material
Solution Approach 1:
The invention merges silicon nitride waveguides (providing visible transparency) with III-nitride quantum well modulators (providing active electro-optic functionality) into a single integrated structure. The III-nitride material is grown directly on the silicon nitride waveguide, creating a unified device that combines passive transmission with active modulation capabilities.
Solution Approach 2:
The silicon nitride waveguide acts as an intermediary substrate that enables the integration of III-nitride active components while maintaining visible range transparency. The III-nitride quantum well structure is deposited on the silicon nitride, allowing the passive waveguide to support active functionality without compromising its optical properties.
3Adaptability or versatility
If III-nitride photonic circuitry is bonded to silicon nitride waveguide circuitry, then active electro-optic modulators are enabled, but the device complexity increases
Solution Approach 1:
The invention adds a vertical dimension to the integration by growing III-nitride quantum well modulators on top of the planar silicon nitride waveguide structure. This vertical stacking approach enables active functionality without requiring lateral expansion or complex lateral bonding, simplifying the overall device architecture.
Solution Approach 2:
The invention replaces mechanical bonding processes with epitaxial growth of III-nitride materials directly on the silicon nitride waveguide. This substitution of growth-based integration for mechanical assembly reduces fabrication complexity and improves interface quality while enabling electro-optic modulation functionality.
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 allows for a photonic integrated circuit (PIC) platform that operates efficiently over a broad wavelength range, including the visible range, with both active and passive functionalities.
Implementation Method 1
an electro-optic modulator formed of a III-nitride waveguide structure disposed on the silicon nitride waveguide
Implementation Method 2
Passive optical circuitry includes silicon nitride waveguides
Implementation Method 3
a dielectric cladding covering the silicon nitride waveguide and electro-optic modulator
Data Source
AI summary
A photonic integrated circuit comprises a silicon nitride waveguide, an electro-optic modulator formed of a III-nitride waveguide structure disposed on the silicon nitride waveguide, a dielectric cladding covering the silicon nitride waveguide and electro-optic modulator, and electrical contacts disposed on the dielectric cladding and arranged to apply an electric field to the electro-optic modulator.