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 |
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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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