Title: A new design of photonic crystal fibre based on Ge₂₀Sb₅Se₇₅ with three zero dispersion wavelengths in mid-infrared range

Authors: Ngoc Vo Thi Minh; Lanh Chu Van

Addresses: Physics Team, Huynh Thuc Khang High School, Gia Lai Province, 600000, Vietnam ' Department of Physics, Vinh University, 182 Le Duan, Vinh City, 460000, Vietnam

Abstract: This paper presents new results on dispersion in solid-core photonic crystal fibres (PCFs) based on a square lattice, with the substrate of Ge₂₀Sb₅Se₇₅. We achieved near-zero, ultra-flat dispersion through the appropriate adjustment of air hole diameters and pitch of cladding. As a result, the optimisation processes allow us to achieve an ultra-flat dispersion with three zero-dispersion wavelengths (ZDWs) in the range of over 6600 nm within the wavelength range from 2700 nm to 9300 nm. The proposed PCF structure could be beneficial in creating soliton trapping during supercontinuum generation to give a wider and smoother supercontinuum spectrum, which may lead to very powerful spectral densities compared to that of single or double ZDWs PCFs. Besides, it has many potential applications in promising areas such as soliton pulse transmission, detecting or sensing, spectroscopy, medical diagnostics, and optical communication systems.

Keywords: PCF; photonic crystal fibre; Ge₂₀Sb₅Se₇₅; dispersion; square lattice; ZDWs; zero-dispersion wavelengths.

DOI: 10.1504/IJNT.2024.146473

International Journal of Nanotechnology, 2024 Vol.21 No.7/8/9/10/11/12, pp.769 - 776

Published online: 30 May 2025 *

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