形状双折射金属表面等离激元的特征长度

Characteristic Lengths of Surface Plasmon Polaritons of Form Birefringence Metal

针对p偏振,研究形状双折射金属和常规介电材料界面的表面等离激元(SPP)。基于形状双折射金属介电常数的双轴各向异性和SPP的色散关系,分别在X方向和Y方向讨论SPP波长、传播距离以及在两种介质中的穿透深度等特征长度的变化规律。另外,分别讨论形状双折射金属的3个结构参数对SPP特征长度的影响,发现X方向的结构周期变化只影响Y方向的SPP特征长度,Y方向的结构周期变化只影响X方向的SPP特征长度,纳米孔半径的变化同时影响X方向和Y方向的SPP特征长度。

For the p polarizations, the surface plasmon polaritons （SPPs） of form birefringence metal and regular materials are investigated. According to the biaxial anisotropy of the permittivity of the form birefringence metal and the dispersion relations of SPP, the characteristic lengths of SPP, including SPP wavelength, propagation distance of SPP and penetration depths of SPP in two media, are discussed in X direction and Y direction. In addition, the effects of three periodic structure parameters of form birefringence metal on the characteristic lengths of SPP are discussed. It is shown that the structure period in Y direction only controls the characteristic lengths of SPP in X direction, the structure period in X direction only affects the characteristic lengths of SPP in Y direction, and the radius of nanoholes adjusts the characteristic lengths of SPP in both X direction and Y direction.