A hidden advantage of van der Waals materials for overcoming limitations in photonic integrated circuitry

With the advance of on-chip nanophotonics, there is a high demand for high refractive index, low-loss materials. Currently, this technology is dominated by silicon, but van der Waals (vdW) materials with high refractive index can offer a very advanced alternative. Still, up to now it was not clear i...

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Bibliographic Details
Published in:arXiv.org 2023-03
Main Authors: Vyshnevyy, Andrey A, Ermolaev, Georgy A, Grudinin, Dmitriy V, Voronin, Kirill V, Kharichkin, Ivan, Arslan Mazitov, Kruglov, Ivan A, Yakubovsky, Dmitry I, Mishra, Prabhash, Kirtaev, Roman V, Arsenin, Aleksey V, Novoselov, Kostya S, Martin-Moreno, Luis, Volkov, Valentyn S
Format: Article
Language:English
Subjects:
Anisotropy
Circuits
Knobs
Optical properties
Propagation modes
Refractivity
Waveguides
Online Access:Get full text
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Summary:With the advance of on-chip nanophotonics, there is a high demand for high refractive index, low-loss materials. Currently, this technology is dominated by silicon, but van der Waals (vdW) materials with high refractive index can offer a very advanced alternative. Still, up to now it was not clear if the optical anisotropy perpendicular to the layers might be a hindering factor for the development of vdW nanophotonics. Here, we studied WS2-based waveguides in terms of their optical properties and, particularly, in terms of possible crosstalk distance. Surprisingly, we discovered that the low refractive index in the direction perpendicular to the atomic layers improves the characteristics of such devices, mainly due to expanding the range of parameters at which single-mode propagation can be achieved. Thus, using anisotropic materials offers new opportunities and novel control knobs when designing the nanophotonic devices.
ISSN:2331-8422