Photonic band gap and light routing in self-assembled lattices of epitaxial Ge-on-Si microstructures

Pedrini, J., Barzaghi, A., Valente, J. , Paul, D. J. , Isella, G. and Pezzoli, F. (2021) Photonic band gap and light routing in self-assembled lattices of epitaxial Ge-on-Si microstructures. Physical Review Applied, 16(6), 064024. (doi: 10.1103/PhysRevApplied.16.064024)

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Abstract

The emergence of a photonic band gap in Ge -on- Si micropillars ordered in a two-dimensional square lattice is demonstrated by the finite-element method. Candidate architectures are fabricated through epitaxy and the opening of the photonic band gap experimentally proved by photoluminescence spectroscopy. When the direct-gap emission of Ge is resonantly driven into the photonic gap, light propagation in the lattice plane is inhibited. Emission is eventually funneled out of plane, yielding a giant increase, i.e., about one order of magnitude, in the observed intensity. The demonstration of light routing in microcrystals’ lattices opens interesting possibilities for Si photonics. The epitaxial self-assembled microstructures introduced here can be monotonically integrated on Si to improve the performances of group-IV lasers or engineered to optimize the working wavelength of future quantum photonic circuits.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Paul, Professor Douglas and Valente, Dr Joao
Authors: Pedrini, J., Barzaghi, A., Valente, J., Paul, D. J., Isella, G., and Pezzoli, F.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Applied
Publisher:American Physical Society
ISSN:2331-7019
ISSN (Online):2331-7019
Published Online:09 December 2021
Copyright Holders:Copyright © 2021 American Physical Society
First Published:First published in Physical Review Applied 16(6): 064024
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
301511micro-crystals Single Photon InfraREd detectorsDouglas PaulEuropean Commission (EC)766955ENG - Electronics & Nanoscale Engineering