fa Radiation Directivity Enhancement of Optical Nano-antennas based on Metamaterial Substrate and Metal Nanoparticles Array Design تخصصی Special پژوهشي Research Based on designed hyperbolic metamaterial (HMTM) substrate, we report enhancement of radiation directivity of the metallic optical nano-antenna in the visible spectrum. Placing monolayer and sub-layers as substrate for the optical nanoantenna results in radiation directivity changing. The far-field radiation patterns of the designed structures have been calculated using FEM (finite element method). The COMSOL package has been used for obtaining the directivity characteristics. It has been shown that a HMTM substrate enhances the radiation field amplitude from 82 to 94 V/m. It is established that by novel arraying of nano-particles and tailoring their metamaterial substrates, one can successfully engineer the radiation patterns and beam angles. Based on designed hyperbolic metamaterial (HMTM) substrate, we report enhancement of radiation directivity of the metallic optical nano-antenna in the visible spectrum. Placing monolayer and sub-layers as substrate for the optical nanoantenna results in radiation directivity changing. The far-field radiation patterns of the designed structures have been calculated using FEM (finite element method). The COMSOL package has been used for obtaining the directivity characteristics. It has been shown that a HMTM substrate enhances the radiation field amplitude from 82 to 94 V/m. It is established that by novel arraying of nano-particles and tailoring their metamaterial substrates, one can successfully engineer the radiation patterns and beam angles. Metallic nanoparticle, Nanoantenna, Hyperbolic metamaterial substrate. Metallic nanoparticle, Nanoantenna, Hyperbolic metamaterial substrate. 1643 1646 http://opsi.ir/browse.php?a_code=A-10-1-794&slc_lang=fa&sid=1 Leila Najafi Leila Najafi leila.najafi@iauasrb.ac.ir 10031947532846003782 10031947532846003782 Yes East Azarbaijan Science and Research Branch, Islamic Azad University East Azarbaijan Science and Research Branch, Islamic Azad University Karim Abbasian Karim Abbasian k_abbasian@tabrizu.ac.ir 10031947532846003783 10031947532846003783 No University of Tabriz University of Tabriz Hamed Baghban Hamed Baghban h-baghban@tabrizu.ac.ir 10031947532846003784 10031947532846003784 No University of Tabriz University of Tabriz