Ultrahigh resolution integrated optic short range surface plasmon-polariton based sensor for aqueous environment. (10th February 2021)

• Record Type: Journal Article
• Authors: Sharma, Vinod K
• Is Part Of: Engineering research express. Volume 3:Number 1(2021)
• Publication Date: 2021-02-10
• Subjects: surface plasmon polariton -- integrated photonics -- biosensor -- aqueous environment; Engineering -- Periodicals; 620.005
• DOI: 10.1088/2631-8695/abe27c
• Languages: English
• ISSNs: 2631-8695

Abstract

Abstract: We propose a short length plasmonic integrated optic sensor with ultrahigh sensitivity and resolution for aqueous environment. The sensor section is a simple multilayer structure consisting of a dielectric planar waveguide separated from a thin metal film by a low index buffer layer. The sensor is based on the hybrid coupling between the guided mode and the short range plasmonic mode supported by the thin metal film. Periodic coupling between these modes takes place along the length of the sensor. For optimized layer thicknesses, resonant peak appears at very short length of sensing section. The spectral position of resonant peak is strongly dependent on the analyte index. We show theoretically that a spectral sensitivity of 3.2 × 10 4 nm RIU −1 with FWHM of 2 nm and resolution of 6.2 × 10 –8 RIU can be achieved for aqueous environment.