White light Z-scan measurements of ultrafast optical nonlinearity in reduced graphene oxide nanosheets in the 400–700 nm region
2015; American Institute of Physics; Volume: 107; Issue: 5 Linguagem: Inglês
10.1063/1.4928124
ISSN1520-8842
AutoresSreekanth Perumbilavil, Pranitha Sankar, T. Priya Rose, Reji Philip,
Tópico(s)Advanced Fiber Laser Technologies
ResumoWavelength dispersion of optical power limiting is an important factor to be considered while designing potential optical limiters for laser safety applications. We report the observation of broadband, ultrafast optical limiting in reduced graphene oxide (rGO), measured by a single open aperture Z-scan using a white light continuum (WLC) source. WLC Z-scan is fast when the nonlinearity is to be measured over broad wavelength ranges, and it obviates the need for an ultrafast tunable laser making it cost-economic compared to conventional Z-scan. The nonlinearity arises from nondegenerate two-photon absorption, owing mostly to the crystallinity and extended π conjugation of rGO.
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