現今全球能源短缺，許多學者積極尋找、發展替代性能源。再生能源(或稱綠色能源)是最佳的替代性能源，因其對環境影響較小、而且取之不盡用之不竭。其中太陽能又因取得容易而且乾淨，所以就有很多關於太陽能源利用的研究。而我們則是希望設計一個可以收集太陽光，以利用於室內照明的光學結構，此光學結構具有兩個與一般傳統的光學結構不同的特性，一：此結構可以像磁磚般鋪在建築物的外層，以便收集陽光導引至室內照明。二：此結構能使收集到的太陽光呈平行光束，如此在用於室內照明時，即便是建築物的內部也能輕易傳遞。為了設計出能如磁磚排在建築物外的光學結構，我們將以相同單位元的方式來組成此光學結構。我們會設計一種光學單位元，當元件串聯使用時會具有收集、壓縮光的線效果，此元件可以收集太陽光，傳遞至鄰近的單位元。單位元將會有兩個輸入與一個輸出，分別為太陽光、前一個單位元的輸出端與單位元本身的輸出端。單位元的設計，以面可分成鋸齒、曲線，以設計概念分成共焦、平板結構設計，共有六種單位元以光學模擬軟體進行模擬分析。

Today, there is a shortage of the energy in the world so many scholars actively seek and develop alternative energy sources. Renewable energy (or green energy) is the best alternative energy because there is low environmental impact and an unfailing supply. Especially, solar energy can obtain easily and clearly. So there are many studies on solar energy. We have designed an optical structure to collect sunlight for indoor illumination. The optical structure has two characteristics to differentiate it from traditional optical structures. First, the optical structure can be used as the exterior skin of a building. Therefore, the optical structure can collect a large amount of sunlight for indoor illumination. Second, our structure produces parallel beams from ambient sunlight, which can be easily guided indoors for illumination, even deep inside a building. In order to be used as tiles on the outsides of buildings, the structures must be made up of small nits. We have designed cascadable optical units to be used together that can collect and compress light. The unit can collect sunlight from sun and the last unit with two inputs and transmits to the next unit. We have used two different optical surfaces, saw-toothed and curved, and the confocal and parallel medium principle to design sixth optical units. Simulating and analyzing by optical simulation software.

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