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As the era of microscale technologies becomes increasingly overcome by that of the nanoscale, an ever-increasing emphasis on the accurate modelling of such scaled systems is apparent. This work explores the combination of the finite element method with a new set of statistical algorithms to model the optical properties of disordered nanoscale morphologies. A silicon surface textured with a random distribution of nanowires is created to simulate, as an example study, how it responds to incident light. By averaging over many iterations of the model in which the structural parameters are varied around average values, a good match to experiment is achieved, showcasing an error as low as 1.34% in magnitude against measured data. This research introduces a fresh computational approach to simulating heterogeneous material structures widely applicable for modelling across the field of nanotechnology.

Elsevier, October 2020

The authors theorise a new optical simulation methodology, using COMSOL Multiphysics and the theory behind optical ray tracing, to translate electromagnetic wave fronts into directional rays at the nanoscale.

COMSOL, October 2020

In this work, we present a method of simulating the reflectance spectra of black silicon surfaces using the finite element method. Outlined is the design and verification of a new set of algorithm-controlled geometries, rendering a vast array of different structural permutations, whilst measuring the spectral response of each individually. Our model is focussed on the variation of these geometries within the limits of certain ranged parameters for quantities such as nanowire height, radius, pitch, bend and bunching. Also explored is the variation of nanowire positioning within the simulation domain, leading to the more accurate depiction of non-uniform spacing between any given pair. Reflectance data was collated and averaged from all the random models to reliably determine the reflectance of an entire b-Si surface. The comparison between simulated results and their real equivalents offers the possibility of a simulation model versatile enough to predict the spectra of new and unorthodox designs.

PVSAT, April 2019

This work explores the implications of random and non-linear nanostructures on electromagnetic wave propagation, within a multiphysics simulation environment. Showcased is a way to noticeably bypass the inaccuracies drawn from the linearity dependency of traditional simulation methods. Applying the COMSOL Multiphysics software platform, the finite element method and a geometry expanded-on from previous work, the analysis of highly intricate nanostructured material surfaces is uniquely reported.

COMSOL, September 2019