應用於近場紀錄之表面電漿波增強式C型奈米波導

Abstract

高密度儲存系統之瓶頸，在於難以取得奈米光點與光輸出量之兼顧。本論文提出一種創新次波長微孔設計，引進奈米波導與表面電漿子的雙重耦合效應，大幅增加穿透場的能量同時仍保持光點大小在奈米之等級。此外，此微孔設計將被應用於光纖之上。由於光纖的輕巧及可撓性，將有利於和既有之磁讀取頭整合成為一個複合式的近場光纖讀 取頭。 根據數值分析與最佳化的結果，若與傳統的次波長微孔做比較，光輸出量將可提升10的5次方。實驗的結果，此一微孔設計在近場區域可獲得一個訊噪比為40 dB 的光學信號，而傳統微孔則因輸出量太低而無法測得；另外，遠場的穿透率也可提升33 倍。這兩項的實驗結果都可證實在此一微孔設計的近場區域有極強的能量提升，達到一個高密度儲存系統的需求。

The difficulty that a high density storage system encounters lies in giving consideration on both a nano‐sized optical spot and an adequate throughput. This thesis proposed an innovative aperture design which possesses the annex of a nano‐waveguide and surface plasmon polaritons to substantially increase the throughput at a nano‐sized optical spot concomitantly. Besides, this aperture design was fabricated on the end face of a fiber, of which the compactness and flexibility facilitate to be integrated with a magnetic pickup as a near‐field hybrid one. By the analyses and optimization, an enhancement with five orders of magnitude in power throughput was derived; moreover, the implemented experimental results, a near‐field transmitted intensity with a signal‐noise ratio of 40 dB and a far‐field transmission enhancement of 33,evidently demonstrated the strong transmitted field enhancement in the near‐field region and fulfilled the requirement of a high‐density storage system.