近零材料的绝热频移：群速度的作用
Adiabatic frequency shifting in epsilon near zero materials: The role of group velocity
摘要：
我们研究了近零（ENZ）材料的绝热频率转换，发现在ε=0附近，对于给定的介电常数变化，最大频率转换并不表现出增加。然而，这种变化可以在较短的长度中实现，并且如果泵浦也在ENZ附近，则可以在较低的泵浦强度下实现。这种慢传播效应使得ENZ材料中的转换效率与微谐振器和其他结构化慢光方案中的转换效率相当，但与后者不同的是，ENZ材料不需要纳米纤维，这构成了它们相对于替代频率转换方法的主要优势。
英文摘要：
We investigate adiabatic frequency conversion using epsilon near zero (ENZ) materials and show that while the maximum frequency conversion for a given change of permittivity does not exhibit increase in the vicinity of ε=0 condition. However, that change can be achieved in a shorter length, and if the pump is also in the ENZ vicinity, at a lower pump intensity. This slow propagation effect makes the conversion efficiency in the ENZ material comparable to that in microresonators and other structured slow light schemes, but unlike the latter no nanofabrication is required for ENZ materials which constitutes their major advantage over alternative frequency conversion approaches.
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