Scientific Results

Bragg extraction of light in 2D photonic Thue-Morse quasicrystals patterned in active CdSe/CdS nanorod-polymer nanocomposites

Year: 2013

Authors: Rippa M., Capasso R., Mormile P., De Nicola S., Zanella M., Manna L., Nenna G., Petti L.

Autors Affiliation: CNR, Inst Cybernet E Caianiello, I-80072 Pozzuoli, Italy; CNR, Ist Nazl Ott, I-80072 Pozzuoli, Italy; INFN Sez Napoli, I-80126 Naples, Italy; Ist Italiano Tecnol, I-16163 Genoa, Italy; UTTP ENEA Portici Res Ctr, I-80055 Portici, Italy

Abstract: In this paper two-dimensional (2D) photonic Thue-Morse quasicrystals (ThMo-PQCs) in active CdSe/CdS nanorod (NR) doped polymer nanocomposites are proposed and experimentally demonstrated. Active PQCs and undoped lattices have been prepared in a one-step fabrication process by an electron beam lithography technique (EBL) and the effects on light extraction and emission directionality are studied experimentally. Vertical extraction of light was found to be strongly dependent on both the geometric parameters of the ThMo-PQCs and the presence of NR dopants. By changing the geometrical parameters of the photonic structures, the resonance peak could be tuned from a narrow bluish green emission at 543 nm up to a red-NIR emission at 711 nm with a full width at half-maximum of 22 nm which is in good agreement with Bragg’s diffraction theory and free photon band structure. Angular resolved measurements revealed a directional profile in the far-field distribution with guided mode extraction in both doped and undoped PQCs and an enhancement as high as 6.5-fold in light extraction was achieved in the doped photonic structures. These experimental results indicate the critical role of the CdSe/CdS NRs in improving the light extraction efficiency of 2D ThMo-PQCs for solid-state lighting and lasing.

Journal/Review: NANOSCALE

Volume: 5 (1)      Pages from: 331  to: 336

KeyWords: Spontaneous emission; band-gap;
DOI: 10.1039/c2nr31839c

Citations: 22
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English