Publication

Abstract : This paper focuses on studying the potential of plasmonic technology for sensing liquid analyte. In this work, a double-slot hybrid plasmonic waveguide on SiO2 substrate layer is considered. The waveguide consists of two narrow slots between metal (silver) and dielectric (silicon) blocks. The width of slots is chosen to facilitate quasi-transverse electric mode. The mode field distribution of proposed waveguide structure with SiO2 filled slots revealed that this hybrid plasmonic waveguide can serve as a reliable candidate for sensing liquid analyte effectively. Effective mode area for propagating optical signal is obtained as 0.025 per square at operating wavelength of 1550 nm. Moreover, peak sensitivity of 910 nm/RIU was achieved for 150 nm thick liquid and 300 nm thick silicon filled slots.