Blog

Here is a summary of the key changes:

• Launch of the Harold Quantum Dot module.
• Harold, HaroldXY and HaroldVCSEL modules:
  • Added support for multi-junction devices. These devices have multiple (M)QW active regions separated by bulk and/or tunnel-junction layers.
  • Added non-local band-to-band tunnelling model. This model provides a more realistic description of the tunnelling processes within tunnel-junction layers.
  • Added QW k.p results. These show the dispersion of the electrons and holes in the QWs as a function of in-plane wavenumber.
• HaroldXY and HarlodVCSEL modules:
  • The electric field is now computed in insulator layers. This means that the capacitive effects of buried insulators are now included in the simulation.
  • Spectral results can now be plotted against either wavelength or photon energy.
  • Added QW Profile results. These are 1D profiles of the QW band structure and wavefunctions (equivalent to Quantum Well Wavefunction results in HaroldGain).
  • Improved convergence of simulations containing pn-blocking buried heterostructures
• HaroldXY module:
• Added operational Wavelength simulation option. This allows the user to choose whether to use a fixed lasing wavelength or to allow the lasing wavelength to follow the peak of the gain spectrum.