Abstract
Design of cylindrical metal-clad semiconductor nano-lasers is undertaken. Specific attention is given to determining the modal gain in structures supporting TM01 Surface Plasmon Polarition (SPP) modes. For representative structures it is indicated that cavity lengths of order 100 µm enable lasing action. In comparison structures supporting TE01 core-confined modes having cavity lengths of order 10 µm may sustain lasing. The analysis methodology adopted offers means to affect the design of candidate semiconductor lasers for bespoke applications.
Highlights
Driven by potential applications in photonic integrated circuits, optical information processing and system-on-a-chip technologies considerable effort has been directed at developing sub-wavelength nano-scale semiconductor lasers
The model developed here provides the basis for more detailed nano-laser design and is capable of extension to provide a self-consistent analysis of the wave-guiding and lasing properties of such metal-clad cylindrical nano-lasers
The principal aim of this paper is to evaluate the optical gain and lasing condition for the TM Surface Plasmon Polariton (SPP) mode which can be supported by the structure of interest
Summary
Driven by potential applications in photonic integrated circuits, optical information processing and system-on-a-chip technologies considerable effort has been directed at developing sub-wavelength nano-scale semiconductor lasers. Metal-clad semiconductor lasers offer significant for realizing the potential of nano-scale lasers. A specific class of such devices which has attracted interest is cylindrical metal-clad nano-lasers for which attention has been given to their operation based on the excitation and support of Surface Plasmon Polariton (SPP) waveguide modes [18]–[21]. The aim of the present work is to explore the opportunities and challenges which arise in the design of metal-clad semiconductor lasers giving specific attention to the role of SPP modes. The approach adopted is to take into account spatial profiling of the optical gain as a means both for optimizing lasing operation and as a step towards a fully self-consistent theoretical model of such structures
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