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We present a method based on a time domain simulation of wave propagationthat allows studying the optical response of a broad range of dielectricphotonic structures. This method is particularly suitable for dealing withcomplex biological structures. One of the main features of the proposedapproach is the simple and intuitive way of defining the setup and the photonicstructure to be simulated, which can be done by feeding the simulation with adigital image of the structure. We also develop a set of techniques to processthe behavior of the evolving waves within the simulation. These techniquesinclude a direction filter, that permits decoupling of waves travellingsimultaneously in different directions, a dynamic differential absorber, tocancel the waves reflected at the edges of the simulation space, amulti-frequency excitation scheme based on a filter that allows decouplingwaves of different wavelengths travelling simultaneously, and anear-to-far-field approach to evaluate the resulting wavefield outside thesimulation domain. We validate the code and, as an example, apply it to thecomplex structure found in a microorganism called Diachea leucopoda, whichexhibits a multicolor iridescent appearance.

A simulation method for determining the optical response of highly complex photonic structures of biological origin