Effects of Waveguide Refractive Index on Near-Field Transducer Efficiency in Heat-Assisted Magnetic Recording
Effects of Waveguide Refractive Index on Near-Field Transducer Efficiency in Heat-Assisted Magnetic Recording
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DOI：
10.1109/tmag.2015.2437914
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发表时间：
2015-05
影响因子：
2.1
通讯作者：
Z. Cen;B. Xu;Y. Toh;J. M. Li;K. Ye;J. Zhang
中科院分区：
文献类型：
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作者：
Z. Cen;B. Xu;Y. Toh;J. M. Li;K. Ye;J. Zhang
在热辅助磁记录（HAMR）系统中，光功率由波导传递，与近场换能器相互作用。采用时域有限差分仿真方法研究了波导芯的光学特性对换能器效率的影响。研究发现，大折射率波导芯可以提高换能器的效率，使换能器能更有效地利用光功率。此外，在波导芯折射率较大的HAMR系统中，换能器在工作过程中吸收的功率更小，从而使换能器具有更好的热稳定性。在了解大波导芯折射率影响的基础上，提出在近红外波段的HAMR系统中采用硅波导来提高换能器效率。分析了硅波导芯的几何形状对换能器性能的影响。采用优化芯尺寸的硅波导，HAMR系统在1200nm处的换能器效率高达9.2%。
In a heat-assisted magnetic recording (HAMR) system, optical power is delivered by the waveguide to interact with the near-field transducer. The influence of optical properties of waveguide core on transducer efficiency has been investigated by using finitedifference time domain simulations. It is observed that the waveguide core of large refractive index can improve transducer efficiency due to more effective exploitation of light power by the transducer. In addition, smaller power is absorbed by the transducer in a HAMR system of larger waveguide core refractive index during operation, which can result in better transducer thermal stability. With the knowledge of effects of large waveguide core refractive index, employing silicon (Si) waveguide in a HAMR system working at near-infrared wavelengths has been proposed to enhance transducer efficiency. Effects of Si waveguide core geometry on transducer performance have been analyzed. A high transducer efficiency of 9.2% at 1200 nm can be achieved in a HAMR system with a Si waveguide of optimized core size.