Optical limiting properties of W2Ag4S8(PPh3)4 and Mo2Ag4S8(PPh3)4

✍ Scribed by Qing Chang; Yan Wang; Hegen Zheng; Yinglin Song

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 177 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2010.05.076

✦ Synopsis

Optical limiting (OL) properties of two hexagonal prism metal clusters, W 2 Ag 4 S 8 (PPh 3 ) 4 and Mo 2 Ag 4 S 8 (PPh 3 ) 4 doped in polymethyl methacrylate (PMMA) polymer and DMF solutions, respectively, were contrastively investigated by using nanosecond laser pulses at 532 nm with a repetition rate of 1 Hz. Experimental results show that the output fluence of DMF solutions for the two samples are both lower than that of their PMMA polymers at a given input fluence; this means DMF solutions of W 2 Ag 4 S 8 (PPh 3 ) 4 and Mo 2 Ag 4 S 8 (PPh 3 ) 4 have better OL properties than that of solid PMMA polymers. The reason is explained by a stimulated scattering theory. That is because the scattering degree of solutions is stronger than that of the corresponding solid polymers due to large density perturbations for solution samples.