Abstract
Photonic crystal surface-emitting lasers (PC-SELs) provide a powerful platform for high-power, single-mode operation with a vertically emitted beam of low divergence and controllable polarization. However, designing these devices is hindered by the shortcomings of conventional simulation approaches, which struggle to simultaneously address finite-size effects, three-dimensional surface emission, and high-order coupling phenomena with both accuracy and efficiency.
This talk introduces the Coupled-Wave Model as a fast and accurate simulation tool for designing photonic crystal surface emitting lasers (PCSELs). The model decomposes the electric field into basic waves, high-order waves, and radiative waves. Considering coupling between waves and perturbation from adjacent cells, this model enables accurate calculation of 3D finite-size devices of multilayer waveguide structures.
Various important properties such as threshold gain, mode frequency, field intensity envelope within the device, and far-field pattern can be obtained. The model completes simulations much more quickly than other models. In addition, validations against conventional simulation models confirm strong agreement in band structures and radiation constants.
The high computational efficiency of the Coupled-Wave Model makes large scale neural network inverse design possible. Diverse types of holes will be generated as training datasets. The project aims to create an inverse mapping from desired optical specifications to optimal PC structures. This will pave the way for real-time, intelligent optimization of next-generation photonic crystal lasers.
Anyone interested is welcome to attend.