Slow waves on long helices.
Slow waves on long helices.
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DOI：
10.1038/s41598-022-05345-1
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发表时间：
2022-02-03
影响因子：
4.6
通讯作者：
Sambles JR
中科院分区：
文献类型：
--
作者：
Barr LE;Ward GP;Hibbins AP;Hendry E;Sambles JR
以非色散和可控的方式减慢光为光子学中的许多新现象打开了大门。因此，已经提出了许多方案来降低光速，其中大多数方案在带宽上受到限制或产生高损耗。在本文中，我们表明，一个长的金属螺旋线支持低损耗，宽带慢波的模式指数，可以通过几何设计控制。对于一个特定的几何形状，我们的模式的色散，发现一个相对恒定的模式指数为45之间的10和30 GHz。我们将实验结果与几何模型和完整的数值模拟进行比较，以量化和了解带宽的限制。我们发现，线性色散区域的带宽与围绕螺旋线传播的螺旋模式和沿沿着光线色散的轴向模式的场之间的杂交程度有关。最后，我们讨论的方法，以扩大近恒定的模式指数的频率范围：我们发现，放置一个直丝沿着轴的螺旋线抑制轴向和高指数模式之间的相互作用所支持的螺旋线，导致带宽增加和更线性的色散。
Slowing light in a non-dispersive and controllable fashion opens the door to many new phenomena in photonics. As such, many schemes have been put forward to decrease the velocity of light, most of which are limited in bandwidth or incur high losses. In this paper we show that a long metallic helix supports a low-loss, broadband slow wave with a mode index that can be controlled via geometrical design. For one particular geometry, we characterise the dispersion of the mode, finding a relatively constant mode index of 45 between 10 and 30 GHz. We compare our experimental results to both a geometrical model and full numerical simulation to quantify and understand the limitations in bandwidth. We find that the bandwidth of the region of linear dispersion is associated with the degree of hybridisation between the fields of a helical mode that travels around the helical wire and an axial mode that disperses along the light line. Finally, we discuss approaches to broaden the frequency range of near-constant mode index: we find that placing a straight wire along the axis of the helix suppresses the interaction between the axial and high index modes supported by the helix, leading to both an increase in bandwidth and a more linear dispersion.
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影响因子：
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