柱狀金屬－介電質波導陣列之表面電漿子布拉赫振盪

Plasmonic Bloch Oscillations in Cylindrical Metal-Dielectric Waveguide Arrays

10.29808/JVSROC.201203.0006

藍永強(Yung-Chiang Lan)；許瑞成(Ruei-Cheng Shiu)

表面電漿子 ； 布拉赫振盪 ； 轉換光學 ； Surface Plasmons ； Bloch Oscillation ； Transformation Optics

真空科技

25卷1期（2012 / 03 / 01）

47 - 53

繁體中文

本文以有限差分時域方法模擬與理論解析探討均勻柱狀金屬－介電質波導陣列的表面電漿子布拉赫振盪現象，經由光學保角映射，柱狀波導陣列可轉換成一個同時擁有等效材料厚度梯度與等效材料介電係數／介磁係數梯度的直管波導陣列，而這兩種梯度是由波導陣列的曲率所造成，所觀察到的表面電漿子布拉赫振盪即是由轉換後的新結構所造成。布拉赫振盪的振盪週期會隨入射波長的增加而增加，但振盪振幅幾乎不會隨著入射波長而改變。

This study investigates plasmonic Bloch oscillations (PBOs) in cylindrical metal-dielectric waveguide arrays (MDWAs) by performing numerical simulations and theoretical analyses. Optical conformal mapping is used to transform cylindrical MDWAs into equivalent chirped structures with permittivity and permeability gradients across the waveguide arrays, which is caused by the curvature of the cylindrical waveguide. The PBOs are attributed to the transformed structure. The period of oscillation increases with the wavelength of the incident Gaussian beam. However, the amplitude of oscillation is almost independent of wavelength.