磁場共振子(Magnetic polaritons, MPs)激發是一種使微奈米週期結構產生異常光穿射與異常光吸收特性的物理機制。過去多數研究傾力於以貴重金屬為材料的週期結構分析磁場共振子，但金屬耗散性對磁場共振子的影響尚未被充分地探討。所以本文主要是針對奈米級金屬狹縫陣列，在波長範圍0.4 m  8.3 m，鋁和鎢會在不同的波段呈現顯著吸收性質，並採用銀狹縫陣列做為比較依準，探討磁場共振子被激發時輻射性質（穿射率、反射率與吸收率），同時檢視LC電路模型預測共振模態激發頻率的適用性，並細究其合適範圍與材料、結構幾何、入射角與波長的相關連性。另外，本文亦藉由週期調整，讓磁場共振子與表面電漿共振子(Surface plasmon polariton, SPP)的激發頻率能縮減差距，以探討模態之間互動對銀狹縫反射率的影響。方法是藉由數值計算獲得狹縫近場電磁場分布、能量密度分布及波印庭向量(Poynting vector)以了解金屬耗散性、表面電漿共振子與磁場共振子作用如何影響狹縫輻射性質。最後，為了彰顯實際運用價值，本文末將利用磁場共振子搭配LC電路模型，以金屬光柵與基板中央有介電質夾層做為結構，針對兩個目標波長及金、鎢兩金屬設計波長選擇性吸收器做為應用範例。文中近場特徵及遠場輻射性質是運用嚴格耦合波理論(Rigorous coupled-wave analysis, RCWA)為基礎的演算法得到。

Magnetic polariton (MP) is one mechanism for the extraordinary transmission and extraordinary absorption through micro/nanoscale periodic structures. Most previous studies focused on noble metals and metal loss effects on MP were not well-understood. The thesis investigates optical responses (absorptance, reflectance, and transmittance) of lossy metallic slit arrays under MP excitations. The studied wavenumber was between 1.2103 cm1 and 2.5104 cm1 for the spectral regions in which aluminum and tungsten are lossy, which do not coincide. The loss of silver is negligible. The LC circuit model predicting MP frequency is not always valid, and the best fitting constant varies with material, slit geometry, angle of incidence, and wavelength. This work also studies the interplay between MP and surface plasmon polariton (SPP) resonance. Their influences on reflectance from slit arrays were investigated by gradually adjusting the period of silver slit arrays for frequencies of SPP and MP to meet. Electromagnetic fields, energy density and Poynting vectors in the near field are numerically obtained to comprehend interactions between MP and loss and SPP. In this work, the near-field characteristics and the far-field properties will be calculated from codes based on the rigorous coupled-wave analysis (RCWA) to discuss radiative properties of slits array under MP excitation. Lastly, gold and tungsten wavelength-selective absorbers will be designed aiming at two wavelengths. The design is fulfilled with a dielectric spacer clipped between metallic strip and substrate and the LC circuit model is employed to determine slit dimensions at specific wavelengths.

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