Light Delivery Apparatus Angular Spectrum Shaping for HAMR
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Solution Overview
Problem
Current Heat-Assisted Magnetic Recording (HAMR) technologies face inefficiencies in local heating precision and energy distribution for reducing magnetic coercivity in storage media, limiting areal density and thermal stability.
Innovation Solution
A light delivery system incorporating a channel waveguide, mode-index refractive surface, and solid immersion mirror is used to shape the angular spectrum of light, focusing energy onto a near-field transducer to selectively heat data bit locations on storage media, thereby reducing magnetic coercivity for precise data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional light delivery methods are used for HAMR, then the system is simpler, but the local heating precision and energy distribution efficiency are insufficient
Solution Approach 1:
The light delivery system is segmented into distinct functional components: a waveguide for light transport, a mode-index refractive surface for angular spectrum shaping, and a solid immersion mirror for focusing. This segmentation allows each component to be optimized independently for its specific function, achieving precise local heating while maintaining manageable system complexity through modular design.
Solution Approach 2:
The mode-index refractive surface acts as an intermediary element between the waveguide and solid immersion mirror, specifically shaping the angular spectrum of light. This intermediary component enables precise control over light energy distribution without requiring complex direct coupling mechanisms, thereby improving local heating precision while avoiding excessive system complexity.
2Productivity
If conventional light delivery methods are used, then the device size is larger, but the local heating efficiency is insufficient
Solution Approach 1:
The system utilizes angular spectrum shaping through the mode-index refractive surface to control light distribution in the angular dimension, rather than relying solely on spatial positioning. This dimensional approach to light control enables efficient local heating in a compact footprint, as the angular modulation of light allows for precise energy concentration without requiring large physical apertures or complex multi-element optical systems.
3Measurement precision
If conventional light delivery methods are used, then the alignment is easier, but the precision of data bit location heating is insufficient
Solution Approach 1:
The system changes the parameter of light angular spectrum through the mode-index refractive surface, transforming the light distribution pattern to match the precise requirements of data bit location heating. This parameter transformation enables high positioning precision by controlling the angular distribution of light energy, while the waveguide structure provides inherent alignment guidance that maintains ease of operation through self-aligning optical paths.
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 the precision and efficiency of data recording by optimizing light energy distribution, improving thermal stability and areal density in magnetic storage media.
Implementation Method 1
a mode-index refractive surface, which shapes an angular spectrum of light on its path to the solid immersion mirror in a manner so as to change a distribution of light energy focused on to the near field transducer
Implementation Method 2
a solid immersion mirror, and a near field transducer. The mode-index refractive surface shapes the angular spectrum of the light on its path to the solid immersion mirror in a manner so as to change the distribution of light energy focused on to the near field transducer
Implementation Method 3
HAMR generally refers to the concept of locally heating a recording medium to reduce the coercivity
Data Source
AI summary
A light delivery system in a slider includes a channel waveguide, a mode-index refractive surface, a solid immersion mirror, and a near field transducer. The mode-index refractive surface shapes the angular spectrum of the light on its path to the solid immersion mirror in a manner so as to change the distribution of light energy focused on to the near field transducer.