Abstract

The bandwidths of thermal-tunable metamaterial perfect absorbers (MPAs) based on the phase change materials such as ${\mathrm{Ge}}_2{\mathrm{Sb}}_2{\mathrm{Te}}_5$ and ${\mathrm{VO}}_2$ are usually hundreds of nanometers at near-infrared frequency. Amorphous silicon (a-Si) provides the approach to achieve linearly thermal-tunable ultra-narrowband MPAs, if the absorption band is narrow enough. Four-nanorod-coupled a-Si resonators are proposed in this Letter. An absorption band at 1064 nm is obtained with ultra-narrow bandwidth (FWHM) only 1.4 nm by exciting the coupled magnetic dipole (CMD) mode, which exhibits great linearity to the temperature. In addition, the thermo-optical sensitivity ($S=\mathrm{\Delta }\lambda /\mathrm{\Delta }T$) is about 0.08 nm/°C. The figure of merit of the thermal tunability performance $\mathrm{FOM}=S/\mathrm{FWHM}=0.06$. As a modulator, the critical temperature of absorptivity at 1064 nm is only 40°C, which is much lower than the ${\mathrm{Ge}}_2{\mathrm{Sb}}_2{\mathrm{Te}}_5$ (GST) and ${\mathrm{VO}}_2$. In addition, the modulation depth is up to 82% at near-infrared frequency.

© 2019 Optical Society of America

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