以基片傳輸型全像片研製光學一對多扇出元件

Abstract

本文提出一種新型光學一對多扇出元件來作為光學連接的應用。光學連接 應用在高速平行處理器或多晶片模組（晶片內或晶片間）可以解決一些電 子連接的間題，如降低散熱、傳播延遲；並且同時可以提高連接密度和頻 寬。構想是利用全像片具有同時執行分光與重新指向的多功來製作光學連 接。我們使用自製的重鉻酸鹽明膠（簡稱ＤＣＧ）當作記錄材料，設計基 片傳輸型全像片（簡稱ＳＭＨ）之疊層結構來達成一新型光學一對多扇出 的功能。其中，重鉻酸鹽明膠是目前少數非常接近理想相性全像記錄材料 特性的材料之一，它具有高繞射效率(>90%)、高信號雜比、高光學品質等 優點。我們所製作的一對多扇出元件也繼承基片傳輸型全像片的特性--扇 入光與扇出光的方向均和全像片表面垂直--這具有容易對光之優點。實驗 拍攝所使用的波是441.6nm（氦鎘雷射），自行製作的重酸鹽明膠繞射效 率已可達90%以上。另外，ＤＣＧ的成像機制、製作程序及處理步驟也會 在本文中一併說明。 In this thesis a novel optical multi-fanouts is proposed as an application to optical interconnect. Optical interconnect can be applied in high speed parallel-processing and both interchip and intrachip in multichhips modules(MCM). It can not only solve some inherent problems in electronic interconnection such as heat dissipation and propagation delay but also increase connect density and channel bandwidth. A set of holograms which are used to beamsplit and redirect simultaneously can be applied to optical interconnect. A novel multi-fanouts element implemented by cascaded structure of substrate-mode holograms( SHMs) with dichromated gelatin(DCG) is presented. DCG, the material whose characteristics is very close to ideal phase holographic recording material, possesses the advantages like high diffraction efficiency, high signal- to-noise ratio and high opical quality. This multi-fanouts element also inherit the characteristics of substrate-mode holograms -- easy-to- aligh due to the fan-in and fan-outs are all perpendicular to the surface of holograms. All experiments are performed with 441.6nm (He-Cd laser). The diffraction efficiency of the volume gratings recorded in self-made DCG can even approach above 90%. The imaging mechanism, fabrication and processing procesures of DCG are also proposed in the thesis.