Photonics Research, 2020, 8 (2): 02000103, Published Online: Jan. 7, 2020  

Facilitated tip-enhanced Raman scattering by focused gap-plasmon hybridization Download: 643次

Author Affiliations
1 Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China
2 Tianjin Union Medical Center, Tianjin 300121, China
3 e-mail: cjmin@szu.edu.cn
4 e-mail: xcyuan@szu.edu.cn
Figures & Tables

Fig. 1. (a) Schematic of the TERS system. 4-Q PD, 4-quadrant photodiode; WPV, zero-order vortex half-wave retarder plate; BS, beam splitter. (b) Schematic of the virtual SP probe-excited TERS on a gold film. RP beam indicates the radially polarized incident beam.

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Fig. 2. Numerical calculation of the electric field normalized to the traditional tightly focused electric field. (a) Schematic of the tip on glass. (b) Calculated electric field |E|2 distribution of the gold-coated tip apex on glass substrate excited by a tightly focused radially polarized 632.8 nm laser. (c) Profiles of the electric field |E|2 along the line through the center plane of the gap volume. (d) Schematic of the tip on gold film. (e) Calculated electric field |E|2 distribution of the gold-coated tip apex on gold film. (f) Profiles of the electric field |E|2 with different gold coating thicknesses. The yellow dashed lines denote the surface of the substrate and the tip apex. Axes units in (b) and (e): nm.

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Fig. 3. (a) SEM image of the gold-coated AFM tip with a thickness of 60 nm; (b) Raman spectra of self-assembled 4-MBA layer measured when the tip was in the engaged mode (red curve) and withdrawn (black curve) mode; (c) spectral measurements on glass substrate with (red curve) and without (black curve) the metallic tip; incident laser, 632.8 nm, 1.8  mW; integration time, 1 s.

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Fig. 4. (a) AFM image of SWCNT bundles deposited on the gold film; (b) height profile along the white dashed line in (a); (c) TERS signal along the dashed line in (a) at the Raman peak of the G-band at 1590  cm1; (d) Raman spectra at positions A and B denoted in (a); laser power, 1.8  mW; integration time, 1 s.

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Fig. 5. (a) AFM image of SWCNT bundles deposited on the gold film; (b) TERS imaging at the Raman peak of 1590  cm1 according to the white dashed region in (a); laser power, 1.8  mW; integration time, 1 s.

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Houkai Chen, Yuquan Zhang, Yanmeng Dai, Changjun Min, Siwei Zhu, Xiaocong Yuan. Facilitated tip-enhanced Raman scattering by focused gap-plasmon hybridization[J]. Photonics Research, 2020, 8(2): 02000103.

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