The light delivery system with a light spot is the key component of heat-assisted magnetic recording (HAMR). We proposed a semi-circle resonator system as the light delivery system for HAMR. It consists of only a semi-circle resonator, a reflecting mirror, and a near-field transducer (NFT). The resonator can provide a stable enhanced optical field to excite the localized surface plasmon of NFT without complex focusing lenses or external controls. Numerical results show that the size of light spots can be 20–40 nm with a good field enhancement. Combined with bit-patterned media, the performance can be improved several times than the thin-film structure. The thermal profile of the light spot shows that the areal density of HAMR can further improve beyond the limit size of light spots, and the recording bit can be reduced to $12\times 12$ nm² corresponding to the areal density of about 4 $Tb/i{n}^2$.

具有光斑的光传输系统是热辅助磁记录（HAMR）的关键组件。我们提出了一种半圆形谐振器系统作为HAMR的光传输系统。它仅由一个半圆形谐振器，一个反射镜和一个近场换能器（NFT）组成。谐振器可以提供稳定的增强光场，以激发NFT的局部表面等离子体激元，而无需复杂的聚焦透镜或外部控件。数值结果表明，光斑的大小可以在20–40 nm之间，并具有良好的场增强效果。与位图媒体相结合，性能可以比薄膜结构提高几倍。光斑的热轮廓表明，HAMR的面密度可以进一步提高，超出光斑的限制大小，并且记录位可以减少为$12\times 12$nm ²对应于约4的面密度$Ťb/\mathrm{一世}{ñ}^2$。