In:
Nanophotonics, Walter de Gruyter GmbH, Vol. 8, No. 5 ( 2019-05-27), p. 849-858
Abstract:
Thin films containing small-sized quantum dots (QDs) and nanoparticles have shown strong optical nonlinearities caused by the confinement effect. Here, we report the study of third-order optical nonlinearities of silver sulfide (Ag 2 S) QD thin films using 800 and 400 nm, 30 fs pulses. The absorption spectrometry and transmission electron microscopy are used to characterize the synthesized 80 and 500 nm Ag 2 S QD films. The giant enhancement of nonlinearities is observed up to three to six orders of magnitude larger compared to those for the bulk and liquid Ag 2 S samples. We also demonstrate the efficient high-order harmonic generation in the plasmas produced during ablation of the Ag 2 S QD thin films. The analysis of the dynamics of the QD-containing plasma spreading allowed optimization of the delay between the heating and the driving pulses for an enhancement of harmonics conversion efficiency.
Type of Medium:
Online Resource
ISSN:
2192-8614
,
2192-8606
DOI:
10.1515/nanoph-2018-0213
Language:
English
Publisher:
Walter de Gruyter GmbH
Publication Date:
2019
detail.hit.zdb_id:
2674162-3
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