Assessment of Specific Absorption Rate and Temperature in the Tumor Tissue Subjected to Plasmonic Bow-Tie Optical Nano-Antenna

Potential research works are done to design different structures of antennas in various dimensions and shapes at Terahertz frequency, but the nano-antenna in optical frequency is a challenge. This paper presents the design and analysis of plasmonic bow-tie optical nano-antenna for tumor treatment. The designed structure is constructed from Gold and SiO
₂
materials in a bow-tie shape. The simulation work is performed using Computer Simulation Technology (CST) studio suite software package version 2019. The resonance wavelength of the designed structure is 532 nm, which represents the resonance of the gold. The waveguide exciting source is used to get maximum absorption (minimum reflectivity) for the resonance wavelength. The near and far field in the nano-antenna are taken into account. The maximum intensity from the plasmonic nano-antenna is obtained to be 8.77 *10
¹⁰
W/m
²
at the resonance wavelength at a distance from the reference plane of 1 μm. The results showed that the absorbed power by the proposed tissue represented by the specific absorption rate (point SAR) is 6.94*10
¹²
W/kg when the position of the proposed tumor in touch with upper edge and in front of the nano-antenna. The temperature distribution is calculated to be 64 C°in the proposed tumor. It is concluded that the obtained specific absorption rate and the calculated temperature in the designed nano-antenna at 532 nm are encouraged to use as a point source for the treatment of tumor tissue.