CC BY
2*
ALT'23
The 30th International Conference on Advanced Laser Technologies
N-P-2
Analysis and research of nonlinear optical phenomena in silicon slot waveguide structures
S. M. Murzagalina 1'2'3E, I. D. Skuratov 12
1-Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Russia 2- JSC « Molecular Electronics Research Institute», Moscow, Russia 3- JSC « Zelenograd Nanotechnology Center, Moscow », Moscow, Russia EEnurzagalina. sm@phystech. edu
The SOI platform provides integration of electronics, photonics and quantum technologies, and also offers a reliable solution for the expanding demands of the telecommunications. A substantial variety of devices, such as optical buffers, interconnections [1], and biological sensors, have already been implemented using linear optics. The second and third-order nonlinearities produce optical power losses, but in same time nonlinear optical phenomena may lead to new applications such as multiplexing and modulating signals. Therefore, researchers come across with the new challenge - to create the device with minimal losses and best functional qualities.
Due to silicon's centrosymmetric crystal structure, the second order nonlinear phenomena are weaker in the scope. However, the structure's borders is where their impact is more noticeable. The study takes into account two-photon absorption, second harmonic generation, four-wave mixing, which offers solution for electro-optical signal modulation. In this research, the structure of a slot waveguide with an OrmoCore polymer deposited is simulated. The figures below show model's cross-sectional parameters and mode characteristics.
Fig.1. Planar overview of waveguide parameters
x(mj (xlOAJJJ
Fig.2. Mode profile
This structure is analyzed using modeling software based on the finite element method (FEM) and the finite difference method in the time domain (FDTD). To reduce optical losses, the geometric properties of the model were adjusted using machine learning approaches such as genetic algorithms. An analytical approach to obtaine the parameters of a nonlinear slot waveguide using the singular perturbation method (SPT) is also investigated. SPT is used to study the behavior of waveguides with spatial perturbation and weak second-and third-order nonlinearities, to obtain solutions with appropriate accuracy [4,5]. The problem of a bent silicon slot waveguide is considered, which will solve the common issue of reducing rotation losses. It is also intended to develop insulin sensors based on that structure.
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[3] Lipson M. [et al.], "Guiding, modulating, and emitting light on Silicon-challenges and opportunities," in Journal of Lightwave Technology, vol. 23, no. 12, pp. 4222-4238, Dec. 2005.
[4] Nayfeh A.H., Asfar O.R. Parallel - plate waveguide with sinusoidally perturbed boundaries //Journal of Applied Physics. - 1974. - T. 45. - №. 11. - C. 4797-4800.
[5] Yokota M. [et al.], Guided transverse-magnetic waves supported by a weakly nonlinear slab waveguide //JOSA B. - 1993. - T. 10. - N°. 6. - C. 1096-1101.
