Mode Splitter Waveguide for Heat-Assisted Magnetic Recording
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Solution Overview
Problem
Current heat-assisted magnetic recording (HAMR) technologies face limitations in achieving high areal data density due to superparamagnetic effects, which can be overcome by efficiently heating magnetic recording media using combined transverse electric (TE) and transverse magnetic (TM) mode light.
Innovation Solution
The use of a waveguide system comprising a first waveguide core configured to receive combined TE and TM mode light, with a second waveguide core spaced apart to couple TM mode light, and a near-field transducer (NFT) at the media-facing surface of a write head to heat the magnetic recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single waveguide core is used to deliver light to the NFT, then the device structure is simple, but the ability to deliver high-power density energy through electromagnetic interaction is limited
Solution Approach 1:
The waveguide system is segmented into multiple waveguide cores (first waveguide core and second waveguide core) that are spaced apart from each other. Each waveguide core is configured to deliver specific polarization modes (TE and TM) separately to the NFT, allowing independent optimization of each mode's delivery while maintaining overall high power density capability.
2Use of energy by moving object
If combined TE and TM mode light is delivered to the NFT, then heating efficiency is improved, but mode separation and coupling complexity increases
Solution Approach 1:
The mode coupling structure is segmented by using separate waveguide cores for TE and TM modes. The first waveguide core is configured to receive and deliver TE mode light, while the second waveguide core is configured to receive and deliver TM mode light. This segmentation allows independent optimization of each mode's coupling and delivery, reducing the overall complexity compared to a single-core system that would require complex mode separation mechanisms.
Solution Approach 2:
The spaced-apart waveguide cores act as intermediaries that independently manage and optimize the delivery of different polarization modes to the NFT. Each waveguide core serves as an intermediary channel that is specifically configured for its designated mode, facilitating efficient energy transfer while maintaining mode purity and reducing coupling complexity.
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 efficient heating of the magnetic recording medium, overcoming superparamagnetic effects and increasing areal data density by delivering high-power density energy through electromagnetic interaction, resulting in a localized high temperature rise.
Implementation Method 1
delivering high-power density energy through electromagnetic interaction, resulting in a localized high temperature rise
Implementation Method 2
configured to receive light from a light source at a combined transverse electric (TE) mode and a transverse magnetic (TM) mode
Data Source
AI summary
An apparatus includes a first waveguide core extending along a light-propagation direction and configured to receive light from a light source at a combined transverse electric (TE) mode and a transverse magnetic (TM) mode. A second waveguide core is spaced apart from the first waveguide core and is configured to couple light at a TM mode to the second waveguide core. A near-field transducer (NFT) is disposed at a media-facing surface of a write head, the NFT receiving the light from the first waveguide core or the second waveguide core and heating a magnetic recording medium in response thereto.