Nonlinear Photonics group is established within the Photonics Center, at the Institute of Physics Belgrade to control nonlinear phenomena and exploit them for novel optical systems. The group is led by Dr. Dragana Jović Savić, and it is focused on the theoretical and numerical work that can provide predictions of dynamic and stationary effects in photonic crystals physics as well as their experimental realization. It works in the field of nonlinear optics, nonlinear photonics, and optical processing, originated in the theoretical investigation of photonic crystals structures facilitating soliton formation and angular momentum transfer, surface solitons in photonic lattices, expanding toward novel applications of nonlinear optical effects in optical telecommunication and information processing such as Anderson localization of light in photonic lattices, reaching a new level in the experimental investigation in defect-guided Airy beams in optically induced waveguide arrays, fabrication of quasiperiodic waveguides such as Fibonacci lattices and aperiodic photonic lattices using non-diffracting beams, especially class of Mathieu beams.
An important class of biochemical sensors are based on slotted waveguides having an increased sensitivity due to the confinement of the optical field in the slot region. We investigate numerically the conditions for the excitation of the modes confined in the slot of the ring. The 3-D finite element method (FEM) is used to calculate the optical power transmission coefficients of all-pass configuration (slotted ring + bus waveguide) in a wide spectral range, while the eigenfrequency spectrum of slotted rings and its dependence on the top cladding refractive index is analyzed by means of 2-D axisymmetric FEM approach.