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Silver Nanodisc Metasurface As Geometrical Tunable Absorber for Tailored Thermal Emission

Authors :

Leila Ghasemzadeh¹ Sajjad Mortazavi² Karim Abbasian³

1- دانشگاه تبریز 2- دانشگاه تبریز 3- دانشگاه تبریز

Keywords :

Tunable Metasurface،Silver Nanodiscs،Thermal Emission،Plasmonic Perfect Absorber،Mid-Infrared (Mid-IR)

Abstract :

Photothermal therapy (PTT) is a promising, minimally invasive approach, for cancer treatment. PTT relies on nanostructures with optimized light absorption for localized heating. This paper addresses this challenge by designing and analyzing a plasmonic metasurface with a Metal-InsulatorMetal (MIM) configuration for enhanced absorption and thermal emission in the mid-infrared region. Using the FDTD method in Ansys Lumerical software, the spectral response of a silver (Ag) nanodisc array was systematically investigated over a wavelength range of 2 to 6 µm. The study analyzed the effect of varying the nanodisc diameter (600, 700, 800, and 900 nm). Results reveal that the 600 nm diameter configuration is optimal, exhibiting maximum absorption and emissivity of approximately 61% at a resonant wavelength of 3.7 µm. In accordance with Kirchhoff’s law, this highly selective and efficient absorption makes the engineered metasurface an ideal candidate for PTT applications requiring precise light-to-heat conversion.