The nonlinear optical properties of linear carbon chains prepared by laser ablation in water were studied by using a nanosecond pulsed excitation A strong optical limiting response was detected at laser fluences above 0 6 J/cm(2) The nature of the nonlinear effect was investigated by the Z scan technique determining both the nonlinear absorption coefficient beta and the refraction one n(2) A high second order hyperpolarizability gamma value of 1 1 x 10(-29) esu, essentially attributed to a dispersive effect, has been measured Moreover the good optical transparency in the visible region and a relatively good photo-stability make these carbon water colloids comparable with other carbon based materials and interesting for potential applications as optical limiter (C) 2010 Elsevier Ltd All rights reserved
Optical limiting effects in linear carbon chains
D'URSO, LUISA;COMPAGNINI, Giuseppe Romano
2011-01-01
Abstract
The nonlinear optical properties of linear carbon chains prepared by laser ablation in water were studied by using a nanosecond pulsed excitation A strong optical limiting response was detected at laser fluences above 0 6 J/cm(2) The nature of the nonlinear effect was investigated by the Z scan technique determining both the nonlinear absorption coefficient beta and the refraction one n(2) A high second order hyperpolarizability gamma value of 1 1 x 10(-29) esu, essentially attributed to a dispersive effect, has been measured Moreover the good optical transparency in the visible region and a relatively good photo-stability make these carbon water colloids comparable with other carbon based materials and interesting for potential applications as optical limiter (C) 2010 Elsevier Ltd All rights reservedI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
