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Proceedings Paper

Accurate modelling of VCSEL distributed Bragg reflectors by Floquet-Bloch theory
Author(s): Francesco De Leonardis; Francesca Magno; Alessandro Rizzato; Vittorio M. N. Passaro
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Paper Abstract

Nowadays, vertical cavity surface emitting lasers (VCSELs) provide a very exciting area of research. The unique geometry of VCSELs results in several significant advantages over their edge-emitting counterparts, including low threshold current, single-longitudinal-mode operation, circular output-beam profile. The optimization of the DBR structure is of fundamental importance to increase the performance of optical systems based on the VCSEL technology. To this aim, sophisticated modelling techniques are needed, where only negligible or no approximations are included in the calculations. Therefore, we have used the Floquet-Bloch theory (FBT) formalism to simulate the DBR performance of VCSEL structures. In this paper we explain the general VCSEL theory and propose a number of simulations to individuate the optimal configuration of DBR mirrors with the aim to maximise the output power laser and reduce the threshold current density. The VCSEL optimization is carried out by considering the best trade off among various parameters, including period number, materials, and doping concentration and profile. It is clearly shown the superiority of the FBT approach in the prediction of the best DBR performance and VCSEL properties by comparing results (reflectivity, spectrum, peak wavelength, gain) with other well-known methods, such as the transfer matrix method (TMM) and coupled-mode theory (CMT).

Paper Details

Date Published: 14 April 2006
PDF: 11 pages
Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 618422 (14 April 2006); doi: 10.1117/12.663547
Show Author Affiliations
Francesco De Leonardis, Politecnico di Bari (Italy)
Francesca Magno, Politecnico di Bari (Italy)
Alessandro Rizzato, Politecnico di Bari (Italy)
Vittorio M. N. Passaro, Politecnico di Bari (Italy)

Published in SPIE Proceedings Vol. 6184:
Semiconductor Lasers and Laser Dynamics II
Daan Lenstra; Markus Pessa; Ian H. White, Editor(s)

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