Optimization of Backscattering Properties of Au@Semiconductor Core-Shell Nanospheres

Yixuan Li; Paerhatijiang Tuersun; Dilishati Wumaier; Meng Wang; Dibo Xu

doi:10.3788/LOP240918

Laser & Optoelectronics Progress, Volume. 61, Issue 23, 2316001(2024)

Optimization of Backscattering Properties of Au@Semiconductor Core-Shell Nanospheres

Yixuan Li, Paerhatijiang Tuersun^*, Dilishati Wumaier, Meng Wang, and Dibo Xu

Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, Xinjiang , China

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Fig. 1. Schematic structure of Au@semiconductor core-shell nanospheres

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$The complex refractive index of Au nanoparticles as a function of wavelength. (a) The variation of the real part n of Au nanoparticles as a function of wavelength; (b) the variation of the imaginary part k of Au nanoparticles as a function of wavelength$

Fig. 2. The complex refractive index of Au nanoparticles as a function of wavelength. (a) The variation of the real part n of Au nanoparticles as a function of wavelength; (b) the variation of the imaginary part k of Au nanoparticles as a function of wavelength

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Fig. 3. Comparison between theoretical and experimental results of resonance wavelengths of Au@TiO₂ core-shell nanospheres of different sizes in water

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Fig. 4. Effect of core radius on backscattering spectra of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres

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Fig. 5. Effect of shell thickness t on backscattering spectra of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres

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Fig. 6. Maximum volume backscattering coefficients of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at an incident laser wavelength of 800 nm and the corresponding core radius and shell thickness

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Fig. 7. Effect of three nanospheres (Au@TiO₂ , Au@ZnS and Au@CdS) on the optimization results at different biological tissues

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Fig. 8. Effect of three nanospheres (Au@TiO₂, Au@ZnS, and Au@CdS) on the optimization results at different incident laser wavelengths λ

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Table 0. Maximum, minimum, mean, and standard deviation of the corresponding core radius versus shell thickness at three sets of classical wavelengths for volume backscattering coefficients greater than 95% of the maximum value for Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres

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Table 0. Maximum, minimum, mean, and standard deviation of the corresponding core radius versus shell thickness at three sets of classical wavelengths for volume backscattering coefficients greater than 95% of the maximum value for Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres

λ /nm

Shell

［R_min， R_max］ /nm

R_mean±σ_R /nm

［t_min， t_max］ /nm

t_mean±σ_t /nm

800

TiO₂

ZnS

CdS

［57.3， 77.1］

［59.0， 79.7］

［58.5， 78.9］

67.0 ± 5.0

69.2 ± 5.2

68.4 ± 5.1

［4.9， 28.5］

［1.8， 26.4］

［2.9， 27.5］

16.5 ± 5.9

14.0 ± 6.1

15.1 ± 6.1

830

TiO₂

ZnS

CdS

［61.1， 82.3］

［62.8， 84.9］

［62.4， 84.2］

71.4 ± 5.3

73.5 ± 5.5

73.1 ± 5.5

［3.3， 29.5］

［1.0， 27.3］

［1.0， 28.2］

16.3 ± 6.5

13.7 ± 6.7

14.5 ± 6.8

900

TiO₂

ZnS

CdS

［69.5， 94.1］

［71.3， 96.3］

［71.1， 96.0］

81.2 ± 6.0

82.7 ± 5.9

82.5 ± 5.9

［1.0， 31.2］

［1.0， 28.4］

［1.0， 29.4］

15.4 ± 7.8

13.5 ± 7.2

14.0 ± 7.4

Table 1. Maximum volume backscattering coefficients of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at three sets of classical wavelengths and their corresponding optimal core radius and shell thicknesses

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Table 1. Maximum volume backscattering coefficients of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at three sets of classical wavelengths and their corresponding optimal core radius and shell thicknesses

λ /nm	Shell material	α_{back， max} /μm^-1	R_opt /nm	t_opt /nm
800	TiO₂	4.69	64.1	19.9
	ZnS	4.56	65.8	18.0
	CdS	4.60	65.3	18.8
830	TiO₂	4.30	68.4	19.9
	ZnS	4.19	70.0	18.0
	CdS	4.21	69.6	18.7
900	TiO₂	3.60	77.8	19.8
	ZnS	3.52	79.5	17.5
	CdS	3.54	79.3	18.1

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Yixuan Li, Paerhatijiang Tuersun, Dilishati Wumaier, Meng Wang, Dibo Xu. Optimization of Backscattering Properties of Au@Semiconductor Core-Shell Nanospheres[J]. Laser & Optoelectronics Progress, 2024, 61(23): 2316001

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Paper Information

Category: Materials

Received: Mar. 19, 2024

Accepted: Apr. 25, 2024

Published Online: Nov. 19, 2024

The Author Email: Paerhatijiang Tuersun (ptuersun@163.com)

DOI:10.3788/LOP240918

CSTR:32186.14.LOP240918

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Maximum volume backscattering coefficients of Au@TiO2 core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at three sets of classical wavelengths and their corresponding optimal core radius and shell thicknesses

Table 1. Maximum volume backscattering coefficients of Au@TiO2 core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at three sets of classical wavelengths and their corresponding optimal core radius and shell thicknesses

Table 1. Maximum volume backscattering coefficients of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at three sets of classical wavelengths and their corresponding optimal core radius and shell thicknesses

Table 1. Maximum volume backscattering coefficients of Au@TiO₂ core-shell nanospheres, Au@ZnS core-shell nanospheres, and Au@CdS core-shell nanospheres at three sets of classical wavelengths and their corresponding optimal core radius and shell thicknesses