Speckle Detection of Surface Plasmon Polaritons

Abstracts: Sensors based on surface plasmon polaritons are of great utility in the eld of biosensing. By detecting the resonance angle or wavelength change, it is possible to sensitively measure surface modi cation which changes the refractive index. In this thesis, we take a new approuch to SPP biosensing by observing changes in the re-radiatied light from directionally scattered surface plasmon polaritons. We show that changes in the resulting speckle pattern can be used to detect single nanoparticle, breaking through previous performance limitations in surface plasmon polariton biosensing.