ABSTRACT
We show high resolution measurements of a surface plasmon resonance (SPR) sensor based on a rectangular nanohole array in a metal film. This SPR setup uses balanced intensity detection between two orthogonal polarizations of a He-Ne laser beam, which allows for sensitivity improvement, noise reduction and rejection of any uncorrelated variation in the intensity signal. A bulk sensitivity resolution of 6.4 x 10(-6) RIU is demonstrated. The proposed methodology is promising for applications in portable nanoplasmonic multisensing and imaging.
Subject(s)
Biosensing Techniques/instrumentation , Surface Plasmon Resonance/methods , Animals , Biology/methods , Equipment Design , Ethanol/chemistry , Humans , Lasers , Microscopy, Electron, Scanning/methods , Models, Statistical , Nanotechnology/methods , Optics and Photonics , Reproducibility of Results , Sensitivity and Specificity , Surface Properties , Time Factors , Water/chemistryABSTRACT
The concept of an integrated nanoplasmonic sensor implemented on a silicon substrate is presented. Developed experimental setup based on rotation of linearly polarized light provides intensity detection between two orthogonal polarizations of a He-Ne laser beam. This optical configuration yields to a sensitivity improvement and noise reduction, resulting in a resolution of 4x10(-5) Refractive Index Units. Proposed methodology is promising for the application in portable nanoplasmonic multisensing and imaging.
ABSTRACT
In this paper, a concept of phase sensitive sensor based on plasmonic nanograting structures with normal incidence and transmission detection is presented. Performed theoretical modeling enables fabrication of nanostructures with optimal geometry for polarimetric measurements of the phase difference between s- and p- polarized light. High phase resolution of the optical setup (6*10(-3) deg.) allows detection of the bulk refractive index with sensitivity equal to 3.8*10(-6) RIU. Proposed technique presents a more efficient alternative to the conventional spectral interrogation method of nanoplasmonic-based sensing and could be used for multisensing or imaging applications.
