金属丝介质中的拓扑相变使红外频率下的高Purcell因子成为可能
Topological phase transition in wire medium enables high Purcell factor at infrared frequencies
摘要：
本文研究了工作在红外波段的金属丝介质中的拓扑相变。这种转变发生在超材料的不确定（开放表面）状态到其介电（封闭表面）状态之间的倒易空间中。由于线介质固有的空间色散，在过渡频率处的混合状态是可能的。这两个表面以相同的频率存在，并且彼此接触。在该频率下，轴向波矢量的所有值对应于传播的空间谐波。这一制度的含义是压倒性的辐射增强。我们数值研究了亚波长偶极子源浸没在这样的介质中的辐射功率增益。与以前的所有作品相比，这个增益（称为Purcell因子）原来是更高的轴向偶极子比横向。
英文摘要：
In this paper, we study topological phase transition in a wire medium operating at infrared frequencies. This transition occurs in the reciprocal space between the indefinite (open-surface) regime of the metamaterial to its dielectric (closed-surface) regime. Due to the spatial dispersion inherent to wire medium, a hybrid regime turns out to be possible at the transition frequency. Both such surfaces exist at the same frequency and touch one another. At this frequency, all values of the axial wavevector correspond to propagating spatial harmonics. The implication of this regime is the overwhelming radiation enhancement. We numerically investigated the gain in radiated power for a sub-wavelength dipole source submerged into such the medium. In contrast to all previous works, this gain (called the Purcell factor) turns out to be higher for an axial dipole than for a transversal one.
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