Heat-assisted magnetic recording (HAMR) is a promising technology with high recording density. The authors’ group has proposed a novel device for HAMR, in which a metal nano-antenna as a near-field transducer is attached to a semiconductor ring resonator as a light source. The ring resonator oscillation should be stable to generate steady near-field light with proper energy density to heat the recording medium. To improve the device performance, the dependence of resonance frequency, electric field intensity distribution, and normalized energy density at the tip of the nano-antenna on ring width and ring size was numerically simulated. When the ring width became wider, the resonance frequency and normalized energy density were more stable and operable, which leads to wide manufacturing tolerance. Although unnecessary solutions with higher radial mode order appeared in this condition, they are easy to control. When the ring size became smaller, the frequency interval between adjacent modes became wider, which leads to the stability of laser oscillation. Moreover, the normalized energy density was increased. As a result, the ring resonator obtains its optimal result with a wide width and an adequately small size.

热辅助磁记录（HAMR）是一种具有高记录密度的有前途的技术。作者的团队提出了一种用于 HAMR 的新型装置，其中将作为近场换能器的金属纳米天线连接到作为光源的半导体环形谐振器。环形谐振器振荡应该是稳定的，以产生具有适当能量密度的稳定近场光来加热记录介质。为了提高器件性能，数值模拟了纳米天线尖端的谐振频率、电场强度分布和归一化能量密度对环宽和环尺寸的依赖性。当环宽变宽时，共振频率和归一化能量密度更稳定和可操作，这导致制造公差变宽。虽然在这种情况下出现了具有更高径向模式阶数的不必要的解决方案，但它们很容易控制。当环尺寸变小时，相邻模式之间的频率间隔变宽，从而导致激光振荡的稳定性。此外，归一化能量密度增加。结果，环形谐振器以宽的宽度和足够小的尺寸获得其最佳结果。