Simulation of the emission wavelength of a semiconductor quantum dot and its applications in single photon sources.

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Name of the Speaker: Speaker : Jyothish M (EE15D010)
Name of the Guide: Dr. Manivasakan.R
Date/Time: 16th November 2022, 3.00pm

Single photon sources are crucial for modern quantum key distribution systems. This work investigates single-photon generation from semiconductor quantum dots using a semi-classical approach. Eigenmode analysis of typical pyramidal quantum dots is performed using the Finite Element Method (FEM). FEM discretization of the simulation domain, development of a weak form of time-independent Schrodinger wave equation, derivation of element and global matrices, Eigenmode solution, and mode visualization are described in detail. The effect of strain, wetting layer, and physical dimensions on the emission wavelength are studied, and empirical relations are obtained. The quantum dot simulation can further be integrated with photonic microcavity simulation and the second-order coherence function of a single photon source with a semiconductor quantum dot in photonic microcavity may be estimated. The talk concludes with a discussion of the current research status and the future directions to take.