本實驗藉由模擬多層膜反射為基礎，研究折射率、層厚、層數等參數對於反射光譜的影響，藉由台灣扇角金龜(Trigonophorus rothschildi)在入射角25到65度之間量測的反射光譜數據，嘗試獲得甲蟲的表面結構的折射率、單層層厚等參數，嘗試對此類甲蟲進行分類與建模。

1990年代，人們就觀察到甲蟲表面具有與色素不同的反射特性，這類顏色可以保存數萬年而不會有退色的現象發生，稱為結構色。甲蟲主要以多層膜結構為其產生顏色的機制，也有少部分甲蟲發展出能反射左旋偏振光或是寬帶光譜特性的結構色。且甲蟲具有入射光角度改變時光譜峰值波長變短的現象，稱為藍移現象。

除了一般的藍移現象外，也針對甲蟲表面具有水滴時造成的顏色變化現象可能之原因進行探討。首先採用Q-U光線追跡法與趨勢線光線追跡法，探討水滴之表面輪廓與接觸角對於入射光之影響。發現水滴接觸角並非造成藍移現象加劇的主因，其折射率對於入射光影響更明顯。

最後，我們也嘗試在模擬中加入隨機層厚參數，以模擬甲蟲表面不完美的結構特質，也對甲蟲之反射光譜進行比較。

In this experiment, the practical effects of parameters on the reflection spectra were investigated on the basis of multi-layer membrane reflection simulations. The reflection spectra of the Trigonophorus rothschildi measured by an angle of incidence between 25 and 65 degrees. Were attempt to obtain parameters such as refractive index and thickness of the surface structure of the beetles for classification and modeling.

In 1990s, it was observed that beetle scutellum have reflex properties different from pigment based ones. Those colors will not fade over time, which called structural colors. Most beetles have a multi-layered membrane structure as the mechanism for color production, and all of them have a phenomenon called blue-shift, where the peak wavelength of the spectrum becomes shorter when the incident angle of light changes.

In addition to the general phenomenon of blue shift, the possible reason of the color change is caused by water droplets on the scutellum of beetles were also investigated. The influence of the surface profile and contact angle of water droplets on the incident light was investigated by the Q-U ray tracing and the trend line ray tracing. It was found that the surface of the water drop was not the main cause of the exacerbation of the blue shift phenomenon, and the refractive index of the water droplet had a more pronounced effect on the incident light.

Finally, we also tried to factor in random layer thickness in the model. That model the imperfect structural properties of the beetle surface, also compare the reflection spectra of the beetles.

第一章 序論 1
第二章 文獻回顧 3
第三章 多層膜反射模擬 13
第四章 模擬與量測 27
第五章 討論與結論 47

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