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Open AccessArticle

On-Chip Guiding of Higher-Order Orbital Angular Momentum Modes

Department of Electrical and Computer Engineering, Ajou University, Suwon 16499, Korea
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Author to whom correspondence should be addressed.
Photonics 2019, 6(2), 72; https://doi.org/10.3390/photonics6020072
Received: 22 May 2019 / Revised: 18 June 2019 / Accepted: 20 June 2019 / Published: 23 June 2019
(This article belongs to the Special Issue Optical Angular Momentum in Nanophotonics II)
Higher-order orbital angular momentum (OAM) mode guiding in a waveguide which is suitable for on-chip integration has been investigated. Based on the relation between the Laguerre-Gaussian mode and the Hermite-Gaussian mode, it has been shown that two degenerate guided modes of π/2l-rotation symmetry can support the l-th order OAM mode. In order to mimic the rotational symmetry, we have proposed the waveguide structure of a cross-shaped core and designed a waveguide that can support OAM modes of ±1 and ±2 topological charges simultaneously at a wavelength of 1550 nm. Purity of the OAM modes guided in the designed waveguide has been assessed by numerically calculating their topological charges from the field distribution, which were close to the theoretical values. We also investigated the guiding of OAM modes of ±3 and ±4 topological charges in our proposed waveguide structure, which revealed the possibility of the separate guiding of those OAM modes with relatively lower purity. View Full-Text
Keywords: orbital angular momentum; higher order orbital angular momentum modes; silicon waveguide; on-chip orbital angular momentum mode orbital angular momentum; higher order orbital angular momentum modes; silicon waveguide; on-chip orbital angular momentum mode
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MDPI and ACS Style

Lee, I.J.; Kim, S. On-Chip Guiding of Higher-Order Orbital Angular Momentum Modes. Photonics 2019, 6, 72.

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