Optical characterization of nanostructured plasmonic polarizers

Abstract

This thesis describes techniques involved in the optical characterization of nanostructured plasmonic devices for use as micropolarizing elements. Two types of structures were measured: (1) ultra-high extinction ratio linear micro-polarizers; and (2) the linear structures combined with circular micro-polarizers for full on-chip Stokes polarimetry. An inspection microscope was modified to perform micro-transmission and micro-reflection measurements with precise control of illumination and collection spot size, as well as control over the incident beam collimation and polarization state. The electrical response of micro-polarizing structures fabricated on photodiodes was also characterized using this system. Guidance on how to perform such measurements is presented. Simulation of the optical response was performed and agrees well with experimental results. Recommendations for future development of the equipment, methods, and structures are made.