Q-factor optimization in photonic crystal nanobeam cavities based on elliptical nanopillars for refractive index sensing
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Date
2023-09-04
Authors
Mendoza-Castro, J. H.
Vorobev, A. S.
Iadanza, Simone
Lendl, B.
Grande, M.
O'Faolain, Liam
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Published Version
Abstract
Label free sensing applications based on refractive index (RI) require new encapsulated high Q-factor cavity designs, that can overcome the inaccuracies inherent in the fabrication process. The required fine tuning of the current RI sensors based on PhCNC makes them highly sensitive to disparities found in the fabrication. These imperfections can dramatically decrease the performance, in designs which possess strict features along the whole design parameters space [1]–[4]. To limit this behaviour, we propose elliptically shaped nanopillars in which the optimum zone of operation is extended. The schematics of the PhCNC and the fabricated device considered in this work are shown in Fig. 1(a) and (b), respectively. Fig. 1(a), depicts three different cross sections of the PhCNC immersed in different analyte refractive index (nA) that can vary from 1 (refractive index that can be considered for gases) to 1.45 (SiO 2 ). The vertical widths (Wy(i)) of the dielectric pillars are quadratically modulated (Wy(i)=Wy(0)+i2(Wy(imax)−Wy(0))/imax2) , from the center to both sides where i increases from 0 to imax (see Fig. 1(a)-left). Fig. 1(c) shows the behavior of the Q-factor calculated by means of 3D-FDTD simulations [5], against different nanopillar widths Wx in two extreme shape cases: rectangular and elliptical ones.
Description
Keywords
Q-factor , Fabrication , Silicon compounds , Performance evaluation , Shape , Refractive index , Photonic crystals
Citation
Mendoza-Castro, J. H., Vorobev, A. S.,Iadanza, S., Lendl, B., Grande, M. and O'Faolain, L. (2023) 'Q-factor optimization in photonic crystal nanobeam cavities based on elliptical nanopillars for refractive index sensing', 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), Munich, Germany, 26-30 June, pp. 1-1. doi: 10.1109/CLEO/Europe-EQEC57999.2023.10232053
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