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Title: Highly localised surface plasmon polaritons in active metallo-organic multilayer structures
Author: Yoon, Hong
ISNI:       0000 0004 2724 3408
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2012
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Amplification of surface plasmon polaritons in plasmonic systems have been of great interest for realizing active nanophotonic devices. In this thesis, we present a study about optical gain of SPPs supported in planar metallo-organic multilayer structures based on the Kretchmann geometry. First, we present the effect of varying the geometry on behaviours of surface plasmon propagation, which appear as the change of angular reflectivity. A theoretical approach explains the characteristics well. A kind of conjugated polymer material is introduced to the structures for obtaining gain. A film of this material with nanometer thickness is attached close to a metallic layer, being optically excited to supply energy. For understanding the interaction between surface plasmon polaritons and the active films, we experimentally investigate energy transfer channels from the active material to surface plasmons with an aid of a theoretical analysis. This result provides a strong evidence of being capable of exciting surface plasmon polaritons via dipole excitation. We also report an experimental demonstration of optical gain properties in conventional waveguide structures where the active material acts as propagating channel by measuring amplified spontaneous emission phenomena, providing information of achievable optical gain. Based on the strong evidences of both the active and passive properties, we demonstrate plasmonic gain in the structure incorporating the polymer film for the first time. For this, a double lock-in amplifier system is introduced. Plasmonic modal gain is explained with a support of theoretical estimates. The achieved modal gain is 9 cm-1. This work suggests the design principle for active nano plasmonic devices.
Supervisor: Stavrinou, Paul ; Bradley, Donal ; Maier, Stefan Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral