We introduce a robust and effective surface integral equation method for modelling light-matter interactions which is simple conceptually and only encompasses the key tasks to obtain the physically important values of the field and its derivative at the surface that are often of interest in micro-photonic applications.
Nanodiamonds containing the Nitrogen-vacancy (NV) centre are emerging as a unique platform for nanoscale sensing in biological systems. There is particular interest in the capability of sensing subcellular changes of magnetic and electrical fields, temperature, and pressure. However, the sensitivity of such nanodiamond particles with NV centre as a probe is highly dependent on the relative location and polarisation of the NV centre to the bulk of the particle. Here we show the optical scattering from an NV centre in a nanodiamond as a function of position and orientation within the nanodiamond. The scattering fields are obtained by using the recently developed robust non-singular surface integral equation method.1, 2 Our results highlight a new pathway to nanodiamond characterisation which may be useful in teasing out the various effects of surface morphology, surface termination, and formation details, which ultimately may benefit the optimisation of diamond production for nanoscale biosensing applications.
Bipyramidal gold nanorods have received a large amount of interest as a plasmonic nanomaterial due to highly localised field at their tips, which provide enhancement for emission processes. However, no proper evaluation of geometrical properties of bipyramids such as tip shape, curvature, pentagonal cross section or the waist have been conducted on the field enhancement and peak evolution. Here we present a full numerical simulation of field enhancement around bipyramidal gold nanorods with variation in geometry. We also present a simple analytical theory based on prolate spheroids to account for bipyramidal shape with correction factor to approximate the shape difference.
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