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Proceedings Paper

Nonlinear optical characterization of new ionic liquids by a noise reduced thermally managed EZ-Scan technique
Author(s): Vinícius C. Ferreira; Graciane Marin; Jesum A. Fernandes; Jairton Dupont; R. B. Correia
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Paper Abstract

Thermal and nonlinear optical characteristics are evaluated for a novel ionic liquid, BMIOMe.NTf2, by means of the well established thermally managed eclipse Z-scan technique (EZ-scan). Nevertheless, this method still requires samples with good optical quality in order to provide a reasonable signal-noise ratio (SNR) when the material’s nonlinearity is small. Two different procedures where then introduced to improve the SNR against sample linear inhomogeneities and scattering. Both procedures are based in a subtraction of noisy background signals from the nonlinear signal of EZ-scan output. The first is applied to thermal effects and slow sample’s response, based on the perform a subtraction of the initial exposure time from the steady state signal, eliminating the linear noise. In this case, we could verify an increment of SNR from 1:2 to 40:1. The second procedure is related to fast response, e.g., arising from the electronic nonlinear polarizability. This consists in performing two sequential measurement, one with a decade of intensity higher than the first. After performing the subtraction between them, linear background suppression can be verified, with improvement of SNR to 2:1, amount about 10 times the signal value. Performing these procedures, we present a study of properties of ionic liquid BMIOMe.NTf2. This presents a steady cumulative effect of multiple pulse absorption leading to thermal lensing as measured by the thermally managed EZ-scan technique. The photoinduced conductivity effect observed for this ionic liquid is discussed based on the observed photothermal conversion. Also a fast response corresponding to a nonlinear refractive index was also registered when the time evolution is extrapolated for short times.

Paper Details

Date Published: 14 May 2018
PDF: 8 pages
Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 106841E (14 May 2018); doi: 10.1117/12.2305879
Show Author Affiliations
Vinícius C. Ferreira, Univ. Federal do Rio Grande do Sul (Brazil)
Graciane Marin, Univ. Federal do Rio Grande do Sul (Brazil)
Jesum A. Fernandes, The Univ. of Nottingham (United Kingdom)
Jairton Dupont, Univ. Federal do Rio Grande do Sul (Brazil)
Univ. of Nottingham (United Kingdom)
R. B. Correia, Univ. Federal do Rio Grande do Sul (Brazil)

Published in SPIE Proceedings Vol. 10684:
Nonlinear Optics and its Applications 2018
Benjamin J. Eggleton; Neil G. R. Broderick; Anna C. Peacock, Editor(s)

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