Nonlinear Dynamics in Semiconductor Lasers 2023 - Abstract
Grineviciute, Lina
During the presentation, the evolution of optical coatings from one-dimensional to tree-dimensional periodic structures will be presented. The focus will be on two topics: i) anisotropic coatings for polarization control [1,2] and ii) the possibility to form the dielectric structures with periodic modulation of optical constants together with the application of angular filtering of light [3,4]. We propose and demonstrate a conceptually novel mechanism of spatial filtering in the near-field domain, by a nanostructured multilayer coating - a 2D photonic crystal structure with a periodic index modulation along the longitudinal and transverse directions to the beam propagation. The structure is built on a nano-modulated substrate (grating), which provides the transverse periodicity. The physical vapor deposition of materials with different refractive indexes is used for the self-repeating modulation in the longitudinal direction. We experimentally demonstrate a 5 µm thick photonic multilayer structure composed of nanostructured layers of alternating high- and low-index materials (Nb2O5 and HfO2, respectively) providing angular selectivity in the near-infrared frequencies with 2° low angle passband. The proposed 2D photonic structure can be considered as a promising component for intracavity spatial filtering even in high power microlasers systems. Moreover, the possibility to form all-silica waveplates and polarizers for 0 angle of incidence will be presented.
[1] L. Grineviciute, et. al. "Impact of deposition conditions on nanostructured anisotropic silica thin films in multilayer interference coatings", Applied Surface Science, 562, 150167, 2021
[2] L. Grineviciute, et. al. "Highly resistant all-silica polarizing coatings for normal incidence applications" Optics letters, Vol. 46, No. 4, 2021
[3] L. Grineviciute, et. al., "Nanostructured Multilayer Coatings for Spatial Filtering", Adv. Optical Mater. 2001730, 2021
[4] L. Grineviciute, et. al., "Fano-like Resonances in Nanostructured Thin Films for Spatial Filtering", Applied Physics Letters 118, 131114, 2021