Modelling of Plasmonic and Graphene Nanodevices

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Springer, May 28, 2014 - Technology & Engineering - 121 pages
The thesis covers a broad range of electronic, optical and opto-electronic devices and various predicted physical effects. In particular, it examines the quantum interference transistor effect in graphene nanorings; tunable spin-filtering and spin-dependent negative differential resistance in composite heterostructures based on graphene and ferromagnetic materials; optical and novel electro-optical bistability and hysteresis in compound systems and the real-time control of radiation patterns of optical nanoantennas. The direction of the main radiation lobe of a regular plasmonic array can be changed abruptly by small variations in external control parameters. This optical effect, apart from its relevance for applications, is a revealing example of the Umklapp process and, thus, is a visual manifestation of one of the most fundamental laws of solid state physics: the conservation of the quasi-momentum to within a reciprocal lattice vector. The thesis analyzes not only results for particular device designs but also a variety of advanced numerical methods which are extended by the author and described in detail. These methods can be used as a sound starting point for further research.
 

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Contents

1 Introduction
1
Part IElectronic Nanodevices Basedon Graphene
10
2 TightBinding Description of Graphene Nanostructures
11
3 Graphene Nanoring as a Quantum Interference Device
25
4 Graphene Nanoring as a Source of SpinPolarized Electrons
40
5 SpinDependent Negative Differential Resistance in Graphene Superlattices
55
Part IIElectroOptical Nanodevices
68
6 Optical Nanoantennas with Tunable Radiation Patterns
71
7 ElectroOptical Hysteresis of Nanoscale Hybrid Systems
84
8 Conclusions and Prospects
97
Appendix ATMM and QTBM Methods
102
Appendix BGreens Tensor in a Stratified Media
111
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