Parametric study of optical transmission through plasmonic hole arrays modulated by the phase transition of vanadium dioxide

• Published in: OSA continuum Vol. 3; no. 8; p. 2106
• Main Authors: Donev, Eugenii U., Hart, Francis X., Nkurunziza, Bertrand Irakoze, Bertschinger, Kevin, Zhang, Jinlin, Suh, Jae Yong
• Format: Journal Article
• Language: English
• Published: United States Optical Society of America 15.08.2020
• ISSN: 2578-7519; 2578-7519
• DOI: 10.1364/OSAC.390879

We have performed comprehensive electromagnetic simulations and preliminary experiments to explore the effects of geometrical and material parameters on the extraordinary optical transmission (EOT) through periodic arrays of subwavelength holes in a bilayer stack consisting of a gold or silver film atop a vanadium dioxide film (Au/Ag + VO 2 ), where the latter undergoes a semiconductor-to-metal phase transition. Using the finite-difference time-domain (FDTD) and finite-element methods (FEM), we vary iteratively the array periodicity, VO 2 film thickness and hole diameters, as well as the refractive index inside the VO 2 -layer holes and the VO 2 optical constants. For each variation, we compare the metallic-to-semiconducting ratios of the zero-order transmission ( T 00 ) peaks and find sharp maxima in these ratios within narrow parameter ranges. The maxima arise from Fabry-Perot and Fano-type resonances that minimize T 00 in the semiconducting phase of the perforated bilayers. At a fixed array period, the primary factors controlling the VO 2 -enabled EOT modulation are the VO 2 thickness, diameter of the VO 2 -layer holes, and absorption in the two VO 2 phases. Besides uncovering the origins of the higher metallic-phase T 00 , this study provides a protocol for optimizing the performance of the bilayer hole arrays for potential uses as dynamically tunable nano-optical devices.