Polymer Waveguide with Dispersed Graphene Core
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Solution Overview
Problem
Existing optical waveguide systems with graphene transfer structures experience low interaction efficiency due to graphene being placed on the side of the waveguide, resulting in limited nonlinear optical operation and high cost due to complex manufacturing processes.
Innovation Solution
A method for manufacturing a polymer waveguide with dispersed graphene, where the graphene is incorporated within the core layer, allowing direct interaction with the peak of the light field and its surrounding region, eliminating the need for costly deposition and transfer processes, and maintaining nonlinearity without surface attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If graphene is transferred and installed on the side of a waveguide for optical operation, then the interaction between laser and graphene can be achieved over a long range, but the interaction efficiency is low because the laser intensity of the evanescent field corresponds to a low part of the overall intensity of the propagating laser
Solution Approach 1:
The patent transitions from a side-coupling configuration (evanescent field interaction) to a core-integrated configuration where graphene is dispersed within the waveguide core. This dimensional change allows the propagating laser to directly interact with graphene at the peak intensity region, converting evanescent field interaction into bulk material interaction and significantly improving interaction efficiency.
Solution Approach 2:
The patent merges the graphene layer with the waveguide core structure by dispersing graphene within the core material. This integration allows the laser to interact with graphene throughout the entire core volume rather than only at the boundary, combining the optical confinement of the waveguide with the nonlinear optical properties of graphene.
2Reliability
If graphene is transferred and installed on the side of a waveguide, then optical operation can be achieved, but the manufacturing process becomes complex and costly due to deposition and transfer processes
Solution Approach 1:
The patent changes the concentration parameter of graphene in the core to optimize the balance between nonlinear optical performance and optical loss. By controlling graphene concentration within a specific range, the patent achieves effective nonlinear optical operation while avoiding excessive absorption losses, eliminating the need for complex transfer processes.
Solution Approach 2:
The patent creates a composite waveguide structure where graphene is dispersed within the polymer core material. This composite approach combines the optical confinement properties of the waveguide with the nonlinear optical properties of graphene, achieving both optical operation capability and simplified manufacturing.
3Power
If graphene concentration in the core is increased to enhance nonlinear optical interaction, then interaction efficiency improves, but optical loss increases due to absorption
Solution Approach 1:
The patent optimizes the graphene concentration parameter within a specific range (0.01-0.1 mg/mL) to achieve the optimal balance between nonlinear optical interaction strength and optical loss. This parameter optimization ensures sufficient nonlinear effect for mode-locking while maintaining acceptable transmission characteristics.
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 enhances nonlinear optical interactions, reduces manufacturing complexity and cost, and maintains nonlinearity over time by dispersing graphene within the polymer waveguide, enabling higher spatial adaptation and efficient optical signal propagation.
Implementation Method 1
Graphene achieves fast control of propagating light due to the properties of linear dispersion of dirac-fermion, ultrafast recovery time, wavelength-independent saturable absorption and very high optical nonlinearity
Implementation Method 2
a core layer (310) including a core (301), wherein the core layer has a higher effective refractive index than the cladding layer
Data Source
AI summary
Embodiments relate to a polymer waveguide including a substrate, a cladding layer made of a first polymer, formed on the substrate, wherein a first monomer is polymerized into the first polymer, and the cladding layer has a groove for the waveguide by removing part of the cladding layer, and a core accommodating graphene therein, formed on the groove, a method for manufacturing the same, and a passively mode-locked laser based on the polymer waveguide.