Nonlinear optical scattering and absorption in bismuth nanorod suspensions

Abstract

The authors present the results of optical limiting measurements of ∼10nm wide bismuth nanorods suspended in chloroform. Their Z-scan measurements reveal that optical limiting under 532nm excitation stems from a strong nonlinear scattering (NLS) subsequent to nonlinear absorption (NLA) by suspension. On the other hand, the optical limiting is entirely due to NLA when excited with 1064nm excitation in the nanosecond regime. The occurrence of NLS at one wavelength and absence at another is unusual, especially when compared to the behavior of carbon nanotubes under similar conditions, in which NLS is dominant at both wavelengths.

Two-photon absorption and optical limiting in tristhiourea cadmium sulphate

“…From repeated measurements it is estimated that the b values lie within an error bar of ±10%. In comparison, under similar excitation conditions, Bi nanorods [17] gave a b value of 10 À11 m/W, Cu nanocomposite glasses [18] were between 10 À12 and 10 À10 m/W, Au-Ag core-shell nanoparticles [19] were between 10 À10 and 10 À9 m/W, and CdS quantum dots [20] were at 10 À9 m/W. In the case of metal-organic coordination complexes, the organic ligand is usually more dominant regarding the NLO effect.…”

Synthesis and nonlinear optical characterization of new 1,3,4-oxadiazoles

“…Therefore β will have contributions from genuine TPA as well as ESA effects. Under similar excitation conditions, NLO materials like Cu nanocomposite glasses gave β values of 10 -10 -10 -12 m/W (Karthikeyan et al 2008), bismuth nanorods gave 5⋅3 × 10 -11 m/W (Sivaramakrishnan et al 2007) and CdS quantum dots gave 1⋅9 × 10 -9 m/W (Kurian et al 2007) respectively. These values show that the present samples have an optical nonlinearity comparable to these recently investigated nanomaterials.…”

Nanobismuth: Fabrication, Optical, and Plasmonic Properties—Emerging Applications

“…e absorbance spectra of coalesced Bi nanostructures in an Al 2 O 3 medium was shown to include absorption bands characteristic of longitudinal and transverse resonances, the former being dominant and shifting from the near UV to the near-infrared as the nanostructure shape becomes more anisotropic, as seen in Figure 11(b) [63]. Pulsed laser-vaporized Bi nanorods in chloroform, with an aspect ratio of 20, displayed an absorption band in the near UV, attributed to a transverse plasmon resonance [100]. e spectral region of the measurement did not reach the photon energies where the longitudinal mode is expected for such aspect ratio.…”

“…In this method, the nanowire length and diameter can be controlled, respectively, via the heating time and the grain size of the Bi thin film deposited, for instance, on a thermal-oxidized silicon wafer (diameters between 21 nm and 10 μm and lengths up to several millimeters) [27]. e nanowires present a rather random orientation on the substrate ( Figure 5(b)), but their growth occurs with a major crystal orientation in the [100] direction ( Figure 5(c)) [27]. As a template-free method, the obtained Bi nanowires are free of the contaminations from chemical solutions or templates.…”