表面電漿共振在次波長孔洞結構下會產生異常穿透(EOT)現象，由於EOT在某些波段下為孔洞提供了極強的穿透，而利用這個現象可以廣泛應用在各個領域， 在之前的文獻指出表面電漿特性二維金屬狹縫的共振穿透特性與相同結構完美導體(非表面電漿)，在相同的等效波長或波傳遞常數下，有相同的共振模態等等。
在此論文中將用FDTD去模擬三維的模擬空間上去分析是否在三維時還有以上的現象，所以論文將分析孔洞的穿透截面積和模態，在將其作一對一的對應，觀察金屬與相同結構完美導體是否有在相同的等效波長或波傳遞常數下，有相同的共振模態等等。為了要排出局域性表面電漿共振(LSPR)的影響力用了半無窮長的結構去做其分析觀察與孔洞之間的不同。也用了半無窮的結構去模擬反射穿透率，在之後希望可以還原出Fabry-Pérot共振峰值

In this paper, we use the three-dimensional (3-D) FDTD to analyze the extra-ordinary transmission in a single nanohole structure. Three major effects were discussed: (1) the dispersion relation of the plasmonic and nonplasmonic cylindrical waveguide and the (2) Fabry-Pérot resonance and localized surface plasmon resonance effects in the 3-D cylindrical hole with finite thickness and (3) the phase shifts occurring at the air-hole interfaces.
We analyze the modal and propagation characteristics of the analytical dispersion relation in the plasmonic and nonplasmonic waveguides, and use the compact FDTD method in cylindrical coordinates to verify the results. We further analyzed the lower order transmission modes of the circular holes with various radius size and hole thickness. Their resonant wavelength shifts were discussed. We use another semi-infinite structure to exclude the local surface plasmon resonant effect and discuss the possibility of mapping the transmission spectrum between plasmonic and nonplasmonic single nanoholes.

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