[20a-PB6-1~5] 4.1 Plasmonics and Nanophotonics

▲ [20a-PB6-3] Design and Optimization of Tip Slotted Bow-Tie Optical Antenna

〇(D)Shubhanshi Sharma¹, Saawan Kumar Bag², Rajat Kumar Sinha¹, Shailendra Kumar Varshney¹ (1.Dept. of E&ECE,IIT Kharagpur,W.B,India, 2.Dept. of Physics,IIT Kharagpur,W.B.,India)

Keywords:Plasmonics, Optical antenna, Mid-Infrared

Analysis of gold bow-tie optical antenna along with the effect of a slot on the performance antenna is studied.The antenna is placed on silica glass substrate.The performance of antenna is analysed by optimising the antenna parameters. It is observed that as slot is made at antenna tips higher order resonances occur at the optimized length of 4.5 µm and thickness 375 µm. Slot is also optimized for length and width. Maximum electric field intensity of 61.35 V/µm and transmittance of -12.98 dB is obtained at the wavelength of 12.85 µm.The designed antenna works in mid-IR range of 8 µm to 15 µm. It can find many applications in area of optical microscopy, optical tweezers, thermal imaging and solar energy harvesting