Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/98830
Title: Optical limiting properties of neutral nickel dithiolenes
Authors: Tan, Wei Lian
Ji, Wei 
Zuo, Jing Lin
Bai, Jun Feng
You, Xiao Zeng
Lim, Jin Hong
Yang, Sidney S.
Hagan, David J.
Van Stryland, Eric W.
Issue Date: 1999
Source: Tan, Wei Lian,Ji, Wei,Zuo, Jing Lin,Bai, Jun Feng,You, Xiao Zeng,Lim, Jin Hong,Yang, Sidney S.,Hagan, David J.,Van Stryland, Eric W. (1999). Optical limiting properties of neutral nickel dithiolenes. Proceedings of SPIE - The International Society for Optical Engineering 3899 : 475-482. ScholarBank@NUS Repository.
Abstract: Wide applications of lasers have stimulated a great interest in development of optical limiting devices. These devices can be used to protect optical sensors from laser-reduced damage because their transmission is high when they are exposed to low-power laser light, and their transmission becomes low when irradiated by intense laser beams. Here we report such a device based on nonlinear optical effects in two neutral nickel complexes with multi-sulfur 1,2 dithiolene ligands, [Ni(medt)2] 1 (medt; 5,6-dihydro-6-methyl-1,4-dithiin-2,3-dithiolate) and [Ni(phdt)2] 2 (phdt = 5,6-dihydro-5-phenyl-1,4-dithiin-2,3-dithiolate). The limiting device consisted of a focusing setup and a 1-mm-thick cell, which contained a benzene solution of one of the complexes. The limiting properties were investigated by both nanosecond and picosecond laser pulses. At 532 nm, the limiting thresholds of complexes 1 and 2 measured by the picosecond laser pulses with a (f/25) focusing geometry were determined to be approximately 0.3 J/cm2. The linear absorption spectra of the two complexes also indicated that their limiting response should cover the visible and near-infrared region (up to 900 nm). All these results show their limiting performance is superior to the limiting effect in C60. Picosecond time-resolved pump-probe and Z-scan experiments revealed that the observed limiting effects should originate from excited-state absorption and refraction.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/98830
ISSN: 0277786X
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

12
checked on Feb 15, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.