Optical limiting effects in linear carbon chains

✍ Scribed by E. Fazio; F. Neri; S. Patanè; L. D’Urso; G. Compagnini

• Book ID: 104009357
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 227 KB
• Volume: 49
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/j.carbon.2010.09.026

✦ Synopsis

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 b and the refraction one n 2 . A high second-order hyperpolarizability c value of 1:1 Â 10 À29 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.