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Publication Detail
Finite-difference time-domain and Monte-Carlo ray tracing hybrid modeling of optical devices and structures
  • Publication Type:
    Conference presentation
  • Publication Sub Type:
    Presentation
  • Authors:
    Portnoi M, Sol C, Tummeltshammer C, Papakonstantinou I
  • Date:
    19/04/2017
  • Medium:
    Spoken
  • Name of Conference:
    2017 MRS Spring Meeting & Exhibit
  • Conference place:
    Phoenix, Arizona, USA
  • Conference start date:
    17/04/2017
  • Conference finish date:
    21/04/2017
  • Language:
    English
  • Keywords:
    FDTD, Monte Carlo Ray Tracing, Optical Devices, Luminescent Solar Concentrators, Hybrid Modeling
  • Addresses:
    Dr Ioannis Papakonstantinou
    University College London, London
    Electronic and Electrical Engineering
    Roberts Building, Torrington Place
    London
    WC1E 7JE
    United Kingdom
Abstract
Computerised modelling of structures and materials has become a vital tool in the development and optimisation of materials and devices, saving time and money incurred from prototype manufacture. Finite-difference time-domain modelling (FDTD) method is used extensively for solving sub-wavelength scale electromagnetic scattering problems, however as modelling dimensions are extended beyond a few μm , demand on computational resources become vast, and the technique is no longer viable. On a macroscopic scale, Monte-Carlo ray tracing, based on classical ray optics, is a robust technique for device simulation. While Monte-Carlo methods are appropriate for modeling macroscale optical systems, the technique can not, on its own, deal with structures whose dimensions approach the wavelength of light. Combined, however, these techniques can be a powerful instrument for the simulation of complex structures of a large scale and reasonable time. In this work, we present such a FDTD / Monte-Carlo hybrid model. We explore two different scenarios often met in electromagnetic problems; i) nanoparticles embedded in a bulk structure, and ii) nanostructures at the interface between two media. Differential scattering, scattering, and absorption cross sections are calculated using FDTD techniques and are converted to probability distributions for individual events in the ray tracing model. Polarisation and wavelength are considered, resulting in a multitude of possible yields; transmission, reflection, absorption, spatial light distributions, photoluminescent conversions (both up and down conversions), and energy transfer (such as FRET). Within our group the platform is used to simulate; nanocomposite films, luminescent solar concentrators, structured surfaces, plasmon and phase change materials. The flexibility of the program allows for easy extension to many diverse applications. At the conference we will present simulation examples of both surface structures and nanocomposite films.
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