Accepted Manuscript Title: Increased Electric Field Enhancement and Broad Wavelength Tunability by Plasmonic Bow-tie Nano-antenna Based on Fractal Geometry with Grid Authors: Vahid Khoshdel, Mehrdad Shokooh-Saremi PII: S1569-4410(18)30297-9 DOI: https://doi.org/10.1016/j.photonics.2019.100705 Article Number: 100705 Reference: PNFA 100705 To appear in: Photonics and Nanostructures – Fundamentals and Applications Received date: 25 October 2018 Revised date: 3 March 2019 Accepted date: 9 April 2019 Please cite this article as: Khoshdel V, Shokooh-Saremi M, Increased Electric Field Enhancement and Broad Wavelength Tunability by Plasmonic Bow-tie Nano-antenna Based on Fractal Geometry with Grid, Photonics and Nanostructures - Fundamentals and Applications (2019), https://doi.org/10.1016/j.photonics.2019.100705 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.