期刊
OPTICAL MATERIALS
卷 39, 期 -, 页码 182-187出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2014.11.023
关键词
Optical limiter; Metal nanoparticles; Nonlinear optics; Z-scan; Laser ablation
资金
- Clemson University TIGER grant
- US National Science Foundation grant [CMMI-1246800]
- DST-NANO-MISSION (GOI)
Metal nanoparticle-decorated low dimensional materials can synergistically combine the nonlinear optical properties of metallic/inorganic nanostructures for enhancing the optical limiting performance. While many materials exhibit excellent optical limiting performance at a relatively higher fluence (>9 J/cm(2)), there is a still a dearth of optical limiting materials for protecting low damage threshold (<1 J/cm(2)) photonic devices. Although metal nanoparticle-decorated graphene hybrids are expected to resolve this issue, the rehybridization of metal d-orbitals and graphene p-orbitals often lead to undesirable changes in graphene's electronic structure which adversely affect the nonlinear optical performance. Here, we demonstrate that d-orbitals of Au nanoparticles exhibit little or no rehybridization with graphene and result in an enhanced optical limiting behavior at a low fluence of similar to 0.4 J/cm(2), which is lower than most metal decorated graphene, carbon nanotube nanocomposites and metal nanoparticles. This optical limiting performance at a lower fluence is attributed to the excellent photo-absorption of Au nanoparticles combined with rapid thermalization of excited carriers by graphene. (C) 2014 Elsevier B.V. All rights reserved.
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