OPTICAL, ELECTROMAGNETIC, AND THERMAL MODELING OF NEAR-FIELD RADIATIVE ENERGY TRANSFER FROM PLASMONIC NANOANTENNAS TO A MAGNETIC RECORDING MEDIUM
Eren Seydi Ünlü
Mechatronics, MSc. Thesis, 2012
Assoc. Prof. İbrahim Kürşat Şendur (Thesis Supervisor), Assoc. Prof. Mahmut F. Akşit, Asst. Prof. Güllü Kızıltaş Şendur, Assoc. Prof. Ali Koşar, Asst. Prof. Burç Mısırlıoğlu
Date &Time: August 6th, 2012 – 13:00
Place: FENS 2019
Keywords: Plasmonics, nano antenna, optical, electromagnetic, thermal modeling, near-field radiative energy transfer, temperature control
Developments in nanotechnology have brought new challenges in heat transfer and temperature control in nanoscale devices. In this thesis, the electromagnetic and thermal behavior of plasmonic nanoantennas are investigated when they are illuminated with a focused beam of light and placed in the vicinity of thin film magnetic layer structures. To investigate this problem, optical, electromagnetic, and thermal models are developed and integrated. An optical modeling tool is developed to define a tightly focused beam of light by utilizing Richards-Wolf theory, which is primarily based on ray-tracing of optical beams. An electromagnetic modeling tool is used to analyze nano antennas and thin-film magnetic layers in terms of electric field and dissipated power distribution profiles. A thermal modeling tool is developed to control the temperature distribution on nanoantennas and thin film magnetic layer structures.
Optical, electromagnetic and heat transfer modeling tools are integrated and simulations are conducted by generating script files using MATLAB codes. Electromagnetic and heat transfer analysis are conducted for dipole, bowtie and arrow shaped nanoantennas. The conditions to obtain single optical and hot spots on the thin film magnetic layer are presented. A novel nanoantenna type is proposed to improve thermal performance. It has been demonstrated that dipole, bowtie and a newly proposed arrow-shaped nano antennas show similar electromagnetic behaviors while the arrow-shaped nano antenna shows significant improvement in terms of temperature control which yields low antenna temperatures.