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Volume 4, Issue 4 (Suppl) J Laser Opt Photonics, an open access journal
ISSN: 2469-410X Optics 2017
November 15-17, 2017
November 15-17, 2017 | Las Vegas, USA
8th International Conference and Exhibition on
Lasers, Optics & Photonics
Site-controlled quantum dots and their integration in photonic crystal nanocavities
Giorgio Pettinari
IFN-CNR, Italy
The fabrication of integrated quantum dot (QD)-optical microcavity systems is a requisite step for the realization of a wide range of
nanophotonic experiments and applications that exploit the ability of QDs to emit non-classical light, e.g., single photons. Here,
we present the possibility of creating site-controlled QDs in dilute-nitride semiconductors by spatially selective H incorporation and/
or removal. In dilute nitrides (e.g., GaAsN), the formation of stable N-2H-H complexes following H incoporation removes the effects
nitrogen has on the alloy properties. In particular, H binding to N atoms in GaAsN leads to an increase in the band gap energy of
the GaAsN (~1.33 eV for [N]=1% at T=5 K) up to the value it has in GaAs (1.52 eV at 5 K). Therefore, by engineering the spatial H
incorporation and/or removal in dilute nitides is possible to attain a spatially controlled modulation of the band gap energy in the
growth plane and therefore, to tailor the carrier-confining potential down to a nm scale, resulting in the fabrication of site-controlled
QDs. Clear evidence of single-photon emission is presented for QDs made either by low-energy H irradiation of lithographically
prepatterned samples and by spatial H removal in a fully hydrogenated sample by using the near-field hot spot generated by a SNOM
tip to locally break the N-H bonds. Also, a lithographic approach to the deterministic QD-PhC nanocavity coupling is demonstrated,
resulting in a significant enhancement (inhibition) of the spontaneous emission rate for low (high) cavity mode (CM)-QD energy
detuning (Purcell effect).
Biography
Giorgio Pettinari has completed his PhD in Materials Science from Sapienza University of Rome in 2008. From 2009 to 2011, he has worked as Assistant Researcher in
High Field Magnet Laboratory (HFML) of Nijmegen (The Netherlands), then (2011-2013) he moved to The University of Nottingham (UK) as Marie Curie Research Fellow.
Since 2013, he is a Researcher at Istitute of Photonics and Nanotechnologies (IFN-CNR) of National Research Council of Italy. He has published more than 35 peer-re-
viewed original papers in accademic journals, 2 invited book chapters and given more than 15 oral contributions and seminars (5 invited) at international conferences and
research institutes.
Giorgio Pettinari, J Laser Opt Photonics 2017, 4:4 (Suppl)
DOI: 10.4172/2469-410X-C1-017