Selective lasing in multimode periodic and non-periodic nanopillar waveguides

Details Selective lasing in multimode periodic and non-periodic nanopillar waveguides Selective lasing in multimode periodic and non-periodic nanopillar waveguides

2006-11-14

arxiv.org/abs/cond-mat/0611351v1

phys. stat. sol. (b) Vol. 244, No. 4, 1211-1218 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures

Scientific paper

10.1002/pssb.200674508

We investigate the lasing action in coupled multi-row nanopillar waveguides of periodic or fractal structure using the finite difference time domain (FDTD) method, coupled to the laser rate equations. Such devices exhibit band splitting with distinct and controllable supermode formation. We demonstrate that selective lasing into each of the supermodes is possible. The structure acts as a microlaser with selectable wavelength. Lasing mode selection is achieved by means of coaxial injection seeding with a Gaussian signal of appropriate transverse amplitude and phase profiles. Based on this we propose the concept of switchable lasing as an alternative to conventional laser tuning by means of external cavity control.

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