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Giorgio Pettinari

The DeLIGHTeD project aims to face one of the main drawbacks for the development of photonics applications, i.e. the deterministic coupling of nm-sized light emitters with photonic-crystal (PhC) micro-cavities.

The very original approach adopted in this project consists in taking advantage of the hydrogen-induced passivation of N atoms in dilute nitride (GaAsN, InGaAsN, GaPN…) semiconductors for the fabrication of site-controlled nano-emitters. The H binding to N atoms in dilute nitrides leads to an increase in the band-gap energy of the N-containing material. Therefore, controlled H incorporation in selected regions of the sample makes possible the obtaining of a spatial modulation of the band-gap energy at the nanometer scale and, eventually, the fabrication of site-controlled quantum dots (QDs) [Adv. Materials 23, 2706 (2011)].
The realized QDs will be then integrated in PhC nano-cavities porously designed by means of an innovative semi-analytic method [Phys. Rev. B 82, 115118 (2010)], based on the possibility of defining a direct relationship between the target electromagnetic field distribution and the dielectric constant of the cavity supporting it.
The research of the DeLIGHTeD Unit at IFN-CNR will focus on the fabrication of innovative PhC micro-cavities, either passive or embedding site-controlled, dilute nitride based nano-emitters. Both optically- and electrically-pumped devices will be realized by means of state-of-the-art electron beam lithography and advanced top-down fabrication techniques.
The fabricated devices will be then characterized by advanced spectroscopic techniques at the DeLIGHTeD Units at Sapienza University of Rome and at University of Florence.

Project Funding: MIUR - FIRB2012  Duration: 2013-2017