Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region

Zhengqing Qi; Jie Yao; Liangliang Zhao; Yiping Cui; Changgui Lu

doi:doi:10.1364/PRJ.3.000313

Photonics Research, 2015, 3 (6): 06000313, Published Online: Jan. 6, 2016

Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region Download： 1008次

Zhengqing Qi ¹Jie Yao ^1,2Liangliang Zhao ¹Yiping Cui ¹Changgui Lu ^1,*

Author Affiliations

¹ Advanced Photonics Center, Southeast University, Nanjing 210096, China

² Nanjing Normal University, Nanjing 210023, China

Figures & Tables

Fig. 1. Schematic of double-resonance gold dimer array substrate.

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Fig. 2. (a) Simulated electric field intensity enhancement factors of the dimer grating (green solid line), the single disk grating (black square line), a single dimer (red circle line), and a single disk (blue triangle line) upon gold film separated by a layer of silica spacer. (b) Ez amplitude at position 2 for the gold dimer array case. (c) Schematics of the four structures simulated.

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Fig. 3. (a) Intensity (|E|2) distribution on the half-height surface of the gold disk with hSiO2=45 nm at 785 nm (SPR) with maximum intensity 2042. (b) 950 nm (LSPR) with maximum intensity 7066 corresponding to the two resonant modes of the dimer grating case in Fig. 2(a), respectively.

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Fig. 4. (a) Simulated electric field spectrum for the structure with Px=550 nm, Py=500 nm, and d=60 nm at different thicknesses of the silica spacer. (b) Holistic enhancement GSERS via the change of the thickness of the silica spacer.

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Fig. 5. Electric field spectrum with Px=550 nm, Py=500 nm, and hSiO2=45 nm at different interparticle separations: 15 nm (black line), 30 nm (red dot-dotted dash line), and 45 nm (blue dotted–dashed line).

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Table1. Normalized Effective Mode Volume and the Quality Factor for Different Interparticle Separation Dimers, a Single Dimer with a Gap of 15 nm, and a Single Disk upon Gold Film Separated by a Layer of Silica Spacer

$d$ (nm)	$V_{eff}$	$Q$	$Q / V_{eff}$
15	$1.16 E - 4$	8.48	7.33E4
20	$1.59 E - 4$	9.07	5.69E4
25	$2.05 E - 4$	9.68	4.71E4
30	$2.45 E - 4$	10.16	4.14E4
35	$2.84 E - 4$	10.55	3.71E4
45	$3.61 E - 4$	11.45	3.17E4
65	$4.78 E - 4$	13.34	2.79E4
Single dimer with a gap of 15 nm	$2.71 E - 4$	4.04	1.49E4
Single disk	$1.33 E - 3$	5.96	4.48E3

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Zhengqing Qi, Jie Yao, Liangliang Zhao, Yiping Cui, Changgui Lu. Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region[J]. Photonics Research, 2015, 3(6): 06000313.

Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region Download： 1008次

Fig. 1. Schematic of double-resonance gold dimer array substrate.

Fig. 3. (a) Intensity (|E|2) distribution on the half-height surface of the gold disk with hSiO2=45 nm at 785 nm (SPR) with maximum intensity 2042. (b) 950 nm (LSPR) with maximum intensity 7066 corresponding to the two resonant modes of the dimer grating case in Fig. 2(a), respectively.

Fig. 4. (a) Simulated electric field spectrum for the structure with Px=550 nm, Py=500 nm, and d=60 nm at different thicknesses of the silica spacer. (b) Holistic enhancement GSERS via the change of the thickness of the silica spacer.

Fig. 5. Electric field spectrum with Px=550 nm, Py=500 nm, and hSiO2=45 nm at different interparticle separations: 15 nm (black line), 30 nm (red dot-dotted dash line), and 45 nm (blue dotted–dashed line).

Table1. Normalized Effective Mode Volume and the Quality Factor for Different Interparticle Separation Dimers, a Single Dimer with a Gap of 15 nm, and a Single Disk upon Gold Film Separated by a Layer of Silica Spacer

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Tunable double-resonance dimer structure for surface-enhanced Raman scattering substrate in near-infrared region Download： 1008次

Fig. 1. Schematic of double-resonance gold dimer array substrate.

Fig. 3. (a) Intensity (|E|2) distribution on the half-height surface of the gold disk with hSiO2=45 nm at 785 nm (SPR) with maximum intensity 2042. (b) 950 nm (LSPR) with maximum intensity 7066 corresponding to the two resonant modes of the dimer grating case in Fig. 2(a), respectively.

Fig. 4. (a) Simulated electric field spectrum for the structure with Px=550 nm, Py=500 nm, and d=60 nm at different thicknesses of the silica spacer. (b) Holistic enhancement GSERS via the change of the thickness of the silica spacer.

Fig. 5. Electric field spectrum with Px=550 nm, Py=500 nm, and hSiO2=45 nm at different interparticle separations: 15 nm (black line), 30 nm (red dot-dotted dash line), and 45 nm (blue dotted–dashed line).

Table1. Normalized Effective Mode Volume and the Quality Factor for Different Interparticle Separation Dimers, a Single Dimer with a Gap of 15 nm, and a Single Disk upon Gold Film Separated by a Layer of Silica Spacer

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