臺灣博碩士論文加值系統

本論文以有限時域差分法(finite-difference time-domain method)及傅立葉光學(Fourier optics approach)，研究近場光碟片之超解析效應之光學作用機制。首先，我們分別探討銻薄膜(Sb-type)及氧化銀(AgOx-type)近場光碟片中，不同的奈米結構對其近場電磁場分佈及遠場讀出訊號之影響。而研究結果發現，近場光碟片中的奈米結構可將次波長記錄點之消散訊號(evanescent signal)耦合至遠場，且奈米結構會影響遠場讀出訊號之行為，而光與奈米結構交互作用所引發之侷域表面電漿增強場可提高耦合出消散訊號之效益。
另外，為了探討近場光碟片中的奈米隨機結構所扮演的角色，我們利用簡化的傅立葉光學模型及統計平均方法，計算近場光碟片之讀出對比訊號(readout contrast signal)，以此與近場光碟之載子雜訊比(carrier-to-noise ratio, CNR)比較，同時研究隨機孔洞之形狀與尺寸對讀出對比訊號之影響。除了讀出對比訊號外，我們還計算出近場光碟片之讀出波形，進一步驗證讀出對比訊號之結果。

Near-field optical disk structure has been an attractive topic in ultrahigh density optical data storage. Evanescent signals of subwavelength recording marks can be retrieved from optical interactions between reading laser beam and near-field active layer in near-field optical disk. In this dissertation, we use the 2-D finite-difference time-domain method (FDTD) and Fourier optics approach to study the mechanism of near-field optical disk. Near-field optical properties and far-field responses of near-field optical disks with various kinds of nanostructrures are studied by FDTD. Results show that evanescent signals of subwavelength recording marks are coupled to propagating waves by nanostructures. Furthermore, a simplified Fourier optical approach is used to study the influence of random nanostructure in near-field active layer. The general properties of near-field optical disk with random nanostructure are analyzed by statistical average. The readout contrast signal and waveform of near-field optical disk with random nano apertures is derived. Results show that resolution of near-field optical disk is influenced by the size of aperture.

誌謝....................................................I
中文摘要................................................II
英文摘要......................................................III
目錄....................................................IV
圖目錄..................................................VI
1. 序論...........................................1
1.1. 奈米光子學(nano-photonics).....................1
1.2. 金屬奈米物質之表面電漿子共振(surface plasmon resonance)..............................................4
1.2.1. 表面電漿子共振理論.............................5
1.2.2. 侷域表面電漿子(localized surface plasmon)......9
1.3. 奈米近場光學記錄與近場光碟片之研究發展.........12
1.3.1. 近場光學記錄之發展 .............................13
1.3.2. 近場光碟片結構之研究與發展.....................15
Reference 18
2. 研究近場光碟片結構之方法與基礎理論.............21
2.1. 馬克士威方程式之數值方法及金屬材料之色散模型...21
2.1.1. 物質色散關係(dispersion relation)之基礎理論....21
2.1.2. 電磁波之數值計算方法...........................26
2.1.3. 有限差分時域法(finite-difference time-domain method).................................................32
2.1.4. 遠場的讀出對比訊號(readout contrast signal)....35
2.2 傅立葉光學(Fourier optics)與近場光碟片結構..........40
Reference ...............................................46
3. 銻(Sb)近場光碟片結構之光學特性與機制探討.......48
3.1. 銻薄膜之類孔穴(aperture-like)結構..............49
3.2. 粗糙表面(nano rough surface)之銻薄膜結構.......55
3.3. 結論...........................................59
Reference ...............................................60
4. 氧化銀(AgOx)近場光碟片結構之光學特性與機制探討 ...............................................62
4.1. 單顆奈米銀顆粒之尺寸效應.......................62
4.2. 奈米銀顆粒排列之結構對近場光碟片光學性質之影響 ...............................................65
4.2.1. 氧化銀近場光碟片之銀顆粒分佈...................66
4.2.2. 規則排列之銀顆粒的光學性質.....................69
4.3. 結論...........................................73
Reference ...............................................74
5. 隨機結構(Random structure)對近場光碟片之影響...76
5.1. 高斯關聯(Gaussian correlation)之隨機結構.......77
5.2. 讀出對比訊號...................................80
5.3. 隨機高斯孔洞分佈之讀出波形(waveform)...........87
5.4. 結論...........................................91
Reference...............................................92
6. 總結...........................................94
附錄A 有限差分時域法之格點設置方法......................98
附錄B向量勢之計算.......................................102

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