Subwavelength mode profile customisation using functional materials

Gratus, Jonathan and Kinsler, Paul and Letizia, Rosa and Boyd, Taylor (2017) Subwavelength mode profile customisation using functional materials. Journal of Physics Communications, 1 (2): 025003. ISSN 2399-6528

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An ability to completely customize the mode profile in an electromagnetic waveguide would be a useful ability. Currently, the transverse mode profile in a waveguide might be varied, but this is usually a side effect of design constraints, or for control of dispersion. In contrast, here we show how to control the longitudinal (propagation direction) mode profile on a sub-wavelength scale, but without the need for active solutions such as synthesizing the shape by combining multiple Fourier harmonics. This is done by means of a customized permittivity variation that can be calculated either directly from the desired mode profile, or as inspired by e.g. the range of shapes generated by the Mathieu functions. For applications such as charged particle beam dynamics, requiring field profile shaping in free space, we show that it is possible to achieve this despite the need to cut a channel through the medium.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Physics Communications
Uncontrolled Keywords:
?? physics and astronomy(all)engineering(all) ??
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Deposited On:
15 Aug 2017 08:02
Last Modified:
21 Apr 2024 00:28