Nonlinear optical switching and all-figures of merit in Bi2S3-xSex/PMMA nanocomposite films investigated by Z scan under visible CW laser

M. Y. Shubar; H. L. Saadon; Saeed J. Abbas

doi:10.3788/COL202018.011902

Journals >Chinese Optics Letters >Volume 18 >Issue 1 >Page 011902 > Article

Chinese Optics Letters
Vol. 18, Issue 1, 011902 (2020)

Nonlinear optical switching and all-figures of merit in Bi₂S_3-xSe_x/PMMA nanocomposite films investigated by Z scan under visible CW laser

M. Y. Shubar, H. L. Saadon^*, and Saeed J. Abbas

Author Affiliations

Laser Applications Research Group (LARG), Department of Physics, College of Science, University of Basrah, Basrah, Iraq

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DOI: 10.3788/COL202018.011902 Cite this Article Set citation alerts

M. Y. Shubar, H. L. Saadon, Saeed J. Abbas. Nonlinear optical switching and all-figures of merit in Bi₂S_3-xSe_x/PMMA nanocomposite films investigated by Z scan under visible CW laser[J]. Chinese Optics Letters, 2020, 18(1): 011902 Copy Citation Text

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Fig. 1. Schematic steps of the sample preparation process.

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Fig. 2. Experimental setup of Z-scan technique. NDF, natural density filter; L, lens; SF, spatial filter; S, sample; A, aperture.

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$(a) X-ray diffraction patterns of Bi2S3−xSex/PMMA nanocomposite films at different compositions, x=0, 0.2, 0.4, and 1. (b) The peak intensity as a function of x composition.$

Fig. 3. (a) X-ray diffraction patterns of

{Bi}_{2} S_{3 - x} {Se}_{x} / PMMA

nanocomposite films at different compositions,

x = 0

, 0.2, 0.4, and 1. (b) The peak intensity as a function of

x

composition.

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Fig. 4. SEM images of

{Bi}_{2} S_{3 - x} {Se}_{x} / PMMA

nanocomposite films at four different compositions,

x = 0

, 0.2, 0.4, and 1.

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Fig. 5. EDX spectrum of

{Bi}_{2} S_{3 - x} {Se}_{x} / PMMA

nanocomposite films for composition (a)

x = 0

and (b)

x = 0.4

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Fig. 6. Optical absorption spectra of

{Bi}_{2} S_{3 - x} {Se}_{x} / PMMA

nanocomposite films with different compositions

x

of 0, 0.2, 0.4, and 1. The inset is the plot of

{(α h υ)}^{2}

as a function of

h υ

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Fig. 7. (I) Closed-aperture and (II) open-aperture Z-scan results at different input powers of the

{Bi}_{2} S_{3 - x} {Se}_{x} / PMMA

nanocomposite films with different compositions: (a) 0, (b) 0.2, (c) 0.4, and (d) 1. The solid lines are theoretical fitting.

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Input Power (mW)	$n_{2} \times 10^{- 10} (m^{2} / W)$				$β \times 10^{- 4} (m / W)$				W				T
	Composition, x				Composition, x				Composition, x				Composition, x
	0	0.2	0.4	1.0	0	0.2	0.4	1.0	0	0.2	0.4	1.0	0	0.2	0.4	1.0
5	$- 1.774$	8.1	$- 8.7$	11.14	$- 4$	12.6	20.5	$- 5.7$	0.93	0.7	3.57	4.5	1.19	0.81	1.2	0.3
7	$- 1.75$	6.1	$- 6.6$	10.5	$- 3$	9.19	16.3	$- 6.18$	0.92	0.5	2.7	4.33	0.75	0.79	1.32	0.31
10	$- 1.47$	6.97	$- 5$	7.9	$- 2$	7	10	$- 4.65$	0.77	0.6	2	3.2	0.72	0.53	1.1	0.31
13	$- 1.4$	5.79	$- 3.45$	6.98	$- 1$	5.6	7.9	$- 5.42$	0.74	0.5	1.4	2.8	0.36	0.51	1.2	0.41

Table 1. Nonlinear Optical Coefficients and Figures of Merit of Bi2S3−xSex/PMMA Nanocomposite Films with Four Different Compositions of 0, 0.2, 0.4, and 1 at 532 nm Laser Excitation