Design of uncomplicated triangular core PCF for enhanced non-linearity applications

•An innovative design of photonic crystal fibre (PCF) for enhanced non-linearity applications using simulation with the finite element method (FEM) is presented.•This proposed triangular core PCF is made up of a silica material with a refractive index of 1.445 and features three large air-holes placed 120° apart in the core, each with a refractive index of 1.00. The air-holes have a pitch length of 6.03 μm and a radius of 2.86 μm, and the wavelength of operation is 1.55 μm.The proposed PCF design has a large diameter to pitch ratio (d/Λ) of up to 0.95, resulting in a reduced spot-size of just above 1.00 μm2.•This indicates that the proposed triangular core PCF design could be used to enhance non-linearity applications. This inventive proposed PCF design can be fabricated using the stack and draw process or the slurry casting method.•The non-linear properties of PCFs are of great interest for various non-linear optical phenomena, such as supercontinuum generation, non-linear frequency conversion, and soliton formation. These phenomena can be tailored by engineering the dispersion properties of the fibre.•This streamlined approach overcomes complexities associated with previous designs, offering a practical solution for effective light guidance while minimizing construction difficulties.•Due to the simplistic nature of the structure having just 3 large air-holes in the clad-ding of the PCF design can be achieved using the traditional stack and draw techniques as well as other well-known fabrication methods for PCFs. An innovative design of Photonic Crystal Fibre (PCF) for enhanced non-linearity applications using simulation with the Finite Element Method (FEM) is presented. The PCF is a kind of fibre optic waveguide that has air-holes along the entire length of the optical fibre, which exploits its exclusive features of being continuously single-moded and having a modifiable spot-size and dispersion properties for various linear and non-linear applications. This proposed triangular core PCF is made of silica material with a refractive index of 1.445 and features three large air-holes placed 120° apart in the core, each with a refractive index of 1.00. The air-holes have a pitch length of 6.03 μm and a radius of 2.86 μm, and the wavelength of operation is 1.55 μm. The proposed PCF design has a large diameter to pitch ratio (d/Λ) of up to 0.95, resulting in a reduced spot-size of just above 1.00 μm2. This indicates that the proposed triangular core PCF design