Dual-Slot Waveguide for HAMR Near-Field Transducer Coupling
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Solution Overview
Problem
Current waveguides in heat-assisted magnetic recording (HAMR) systems are inefficient in coupling light energy to near-field transducers, leading to suboptimal surface plasmon resonance and magnetic recording accuracy due to high coercivity of recording media.
Innovation Solution
The use of dual-slot waveguides with low-index material regions surrounded by high-index material, and slot waveguides with angled high-index regions to concentrate light energy efficiently onto near-field transducers, enhancing surface plasmon resonance and magnetic orientation changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional waveguides are used in HAMR systems, then the structure is simple, but the light energy coupling to near-field transducers is inefficient
Solution Approach 1:
The waveguide is divided into multiple functional regions including a first light propagating region, a second light propagating region, and an intermediate region with high-index material. This segmentation allows each region to perform a specific function in the energy coupling process, improving overall coupling efficiency while managing structural complexity through functional specialization.
Solution Approach 2:
Different regions of the waveguide are assigned different refractive index characteristics - low-index materials in light propagating regions and high-index material in the intermediate region. This local variation in material properties optimizes light confinement and coupling at specific locations, enhancing energy transfer to the near-field transducer without requiring complete structural redesign.
2Stability of the object's composition
If high coercivity recording media are used, then magnetic stability is improved, but magnetic recording accuracy deteriorates due to suboptimal surface plasmon resonance
Solution Approach 1:
The waveguide structure creates periodic modulation of the electromagnetic field as it propagates through regions of different refractive indices. This periodic field variation enhances the excitation of surface plasmons at the near-field transducer, improving the resonance condition and enabling more accurate magnetic recording even in high coercivity media.
Solution Approach 2:
The patent modifies the refractive index parameters of the waveguide materials and the geometric parameters of the light propagating regions to optimize the electromagnetic field distribution. By adjusting these parameters, the surface plasmon resonance condition is enhanced, improving magnetic recording accuracy while maintaining the stability benefits of high coercivity media.
3Power
If light energy is not concentrated at the near-field transducer, then the waveguide structure is simpler, but surface plasmon resonance efficiency decreases
Solution Approach 1:
The waveguide structure employs nested regions where the first and second light propagating regions are positioned within and around the intermediate region containing high-index material. This nested configuration creates multiple interfaces that progressively concentrate and guide the electromagnetic field toward the near-field transducer, enhancing surface plasmon resonance through cumulative field confinement.
Solution Approach 2:
The intermediate region with high-index material acts as an intermediary between the light propagating regions and the near-field transducer. This intermediate structure mediates the energy transfer by providing optimal impedance matching and field confinement, enabling efficient coupling of light energy to excite surface plasmons at the transducer interface.
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
The proposed waveguide configurations significantly increase the concentration of light energy at the near-field transducer, improving the efficiency of surface plasmon resonance and reducing data errors by effectively lowering magnetic coercivity, thus enhancing the recording process.
Implementation Method 1
The slot waveguide has first and second high-index regions surrounding a middle, low-index region that extends along a light propagation direction
Implementation Method 2
enhancing surface plasmon resonance and magnetic orientation changes
Data Source
AI summary
A dual-slot waveguide receives energy from a coupling waveguide. The dual-slot waveguide includes first and second light propagating regions of low-index material located side-by-side in a direction normal to a light propagation direction. Inner sides of the first and second light propagating regions are separated by a first region of a high-index material. Second and third regions of the high-index material surround outer sides of the first and second light propagating regions. A near-field transducer receives portions of the energy from the first and second light propagating regions.