Branched Waveguide Mode Conversion for HAMR Light Delivery
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Solution Overview
Problem
Heat-assisted magnetic recording (HAMR) devices face limitations in areal data density due to superparamagnetic effects, which require efficient light delivery systems to locally heat and change magnetic orientations reliably.
Innovation Solution
A waveguide configuration comprising a waveguide input coupler and a tapered branch waveguide, along with a waveguide adapter, converts light from a base transverse waveguide mode to a higher-order mode, minimizing excitation of the fundamental mode and optimizing light delivery for near-field transducers in HAMR devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional waveguide delivers light in a base transverse mode, then the structure is simple, but the light delivery efficiency for HAMR is insufficient
Solution Approach 1:
The waveguide system is divided into multiple segments: a first waveguide for light delivery, a second waveguide for mode conversion, and a branch waveguide coupled to the second waveguide. This segmentation allows the base mode light to be converted to higher-order modes more efficiently, improving light delivery efficiency for HAMR while maintaining manageable structural complexity through modular design
Solution Approach 2:
The branch waveguide acts as an intermediary element coupled to the second waveguide. It receives base mode light from the first waveguide and facilitates conversion to higher-order modes in the second waveguide. This intermediary structure enables efficient mode conversion without requiring direct complex coupling between the primary light delivery path and the mode conversion function
2Reliability
If light is delivered in a base transverse mode, then the waveguide structure is simple, but the magnetic orientation change reliability is insufficient
Solution Approach 1:
The waveguide system is divided into multiple segments: a first waveguide for light delivery, a second waveguide for mode conversion, and a branch waveguide coupled to the second waveguide. This segmentation allows the base mode light to be converted to higher-order modes more efficiently, improving light delivery efficiency for HAMR while maintaining manageable structural complexity through modular design
Solution Approach 2:
The patent changes the waveguide mode parameter from base transverse mode to higher-order modes through the branch waveguide coupling mechanism. This parameter change in the light mode enables more reliable magnetic orientation changes in the HAMR process by providing better light confinement and heating efficiency, while the overall structural complexity is managed through the systematic design of the segmented waveguide system
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 configuration enhances the efficiency of light delivery in HAMR devices, allowing for precise heating and reliable data storage by converting light from a base mode to a higher-order mode, thereby improving areal data density and storage reliability.
Implementation Method 1
the waveguide input coupler, the branch waveguide, and the waveguide adapter are configured to convert input light having a base transverse waveguide mode to output light having a higher-order waveguide mode
Data Source
AI summary
An apparatus including a waveguide input coupler, a tapered branch waveguide, and a waveguide adaptor physically connected to the waveguide input coupler proximal end and to the branch waveguide proximal end. The waveguide input coupler includes a distal end having a distal end width and a proximal end having a proximal end width. The tapered branch waveguide includes a distal end having a distal end width and a proximal end having a proximal end width, the branch waveguide distal end width being greater than the branch waveguide proximal end width. The waveguide input coupler, the branch waveguide, and the waveguide adapter are configured to convert input light having a base transverse waveguide mode to output light having a higher-order waveguide mode.