Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water

Shuai Yuan; Lirong Wang; Fengjiang Liu; Fengquan Zhou; Min Li; Hui Xu; Yuan Nie; Junyi Nan; Heping Zeng

doi:doi:10.3788/COL201917.032601

Chinese Optics Letters, 2019, 17 (3): 032601, Published Online: Mar. 8, 2019

Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water Download： 628次

Shuai Yuan ¹Lirong Wang ¹Fengjiang Liu ²Fengquan Zhou ¹Min Li ¹Hui Xu ¹Yuan Nie ¹Junyi Nan ²Heping Zeng ^1,2,*

Author Affiliations

¹ Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

² State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Figures & Tables

Fig. 1. Schematic diagram of the experimental setup. The laser pulses were focused by a fused silica lens F1 ( $f = 21 cm$ ) into pure water and doped water. Filament in the cuvette was imaged by a CCD camera with ND and bandpass filters in front. The output emission was collected and directed to a fiber-coupled spectrometer. VA, variable attenuator; CCD, charge-coupled device.

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Fig. 2. Top views of light channel (top row) and the corresponding longitudinal white light intensity distribution in gold-nanoparticle-doped water (bottom row) with input pulse energy of (a), (b) 5.49 μJ and (c), (d) 9.86 μJ and in pure water with pulse energy of (e), (f) 9.72 μJ.

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Fig. 3. Starting position of multifilaments as a function of $P / P_{cr}$ (input power divided by critical power) in gold-nanoparticle-doped water. Solid squares, experimental results; red line, simulations. We take $P_{cr} = 0.5 MW$ for the critical power of self-focusing in doped water by considering the results in Table 1.

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Fig. 4. Spectra obtained for the propagation of the laser pulse in gold-nanoparticle-doped water (green and dark yellow solid curves) as compared with those in pure water (pink and red solid curves) under (a) low and (b) high average input energy. The spectra are normalized to the intensity of the signal at 800 nm.

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Table1. Measured Critical Power (Pcr) and Nonlinear Refractive Index (n2) in Gold-nanoparticle-doped Water and Pure Water Under Different Input Pulse Energy

	Pulse Energy (μJ)	Critical Power $P_{cr}$ (MW)	Nonlinear Refractive Index $n_{2}$ ( ${cm}^{2} / W$ )
Doped water	5.49	0.48	$15.0 \times 10^{- 16}$
Doped water	9.86	0.53	$13.6 \times 10^{- 16}$
Pure water	9.72	2.35	$3.04 \times 10^{- 16}$

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Shuai Yuan, Lirong Wang, Fengjiang Liu, Fengquan Zhou, Min Li, Hui Xu, Yuan Nie, Junyi Nan, Heping Zeng. Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water[J]. Chinese Optics Letters, 2019, 17(3): 032601.

Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water Download： 628次

Fig. 2. Top views of light channel (top row) and the corresponding longitudinal white light intensity distribution in gold-nanoparticle-doped water (bottom row) with input pulse energy of (a), (b) 5.49 μJ and (c), (d) 9.86 μJ and in pure water with pulse energy of (e), (f) 9.72 μJ.

Table1. Measured Critical Power (Pcr) and Nonlinear Refractive Index (n2) in Gold-nanoparticle-doped Water and Pure Water Under Different Input Pulse Energy

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Enhanced nonlinearity for filamentation in gold-nanoparticle-doped water Download： 628次

Fig. 2. Top views of light channel (top row) and the corresponding longitudinal white light intensity distribution in gold-nanoparticle-doped water (bottom row) with input pulse energy of (a), (b) 5.49 μJ and (c), (d) 9.86 μJ and in pure water with pulse energy of (e), (f) 9.72 μJ.

Table1. Measured Critical Power (Pcr) and Nonlinear Refractive Index (n2) in Gold-nanoparticle-doped Water and Pure Water Under Different Input Pulse Energy

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