R&D: High Field Enhancement of Plasmonics Antenna Using Ring Resonator for HAMR

IEEE Transactions on Magnetics has published an article written by Wei Chen, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P.R.China, Jincai Chen, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P.R.China and Key Laboratory of Information Storage System (School of Computer Science and Technology, Huazhong University of Science and Technology), Ministry of Education of China, Wuhan 430074, P.R.China., Zongsong Gan, Ke Luo, Zhenxing Huang, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P.R.China, and Ping Lu, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P.R.China and Key Laboratory of Information Storage System (School of Computer Science and Technology, Huazhong University of Science and Technology), Ministry of Education of China, Wuhan 430074, P.R.China.

Abstract: “A light delivery system based on localized surface plasmon (LSP) is the key component of heat-assisted magnetic recording (HAMR). We demonstrated a novel resonator-antenna system as the light delivery system for HAMR. We numerically analyzed the interaction mechanism between the resonator waveguide and the antenna. The localized enhanced resonated field of the resonator can improve the electric field enhancement of the antenna. Based on the interaction mechanism, we proposed the ring resonator to achieve higher electric field enhancement of light spots as the resonated field can be several times higher than input light under the resonance condition. The input laser energy can be recycled by limiting the energy in the ring waveguide without using higher power laser sources. Numerical results show that the nanofocusing performance in the ring resonator system would be much better than normal light systems. The maximum electric field enhancement of light spots can be 124, and the absorption efficiency can be about 10% in the ring-lollipop system. The proposed resonator-antenna system can effectively increase the nanofocusing performance of the light delivery system for HAMR.“