Lu Zhang, Wending Zhang, Fanfan Lu, Zhiqiang Yang, Tianyang Xue, Min Liu, Chao Meng, Peng Li, Dong Mao, Ting Mei, Jianlin Zhao, "Azimuthal vector beam exciting silver triangular nanoprisms for increasing the performance of surface-enhanced Raman spectroscopy," Photonics Res. 7, 1447 (2019)

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- Photonics Research
- Vol. 7, Issue 12, 1447 (2019)

Fig. 1. Sketch map of the experimental setup for SERS examination of the ATNA substrate. Inset is (a1) the mode intensity distribution and (a2)−(a4) the polarization examination results of the AVB.

Fig. 2. Fabrication and characterization of the ATNA substrates. (a)–(c) Sketch map of the fabrication process of the ATNA substrates; (d) SEM image of the Ag-coated PS nanosphere array with the diameter of PS nanospheres of D = 300 nm ; (e) SEM image of the Ag-coated PS nanospheres stripped from the silicon wafer using the slide glass; SEM images of the ATNA substrates fabricated using PS nanospheres with (f) D = 300 nm , (g) 400 nm, and (h) 600 nm. (i) Reflection spectra of the ATNA substrates with D = 300 nm (red curve), 400 nm (green curve), and 600 nm (violet curve).

Fig. 3. Calculation of the electric-field intensity enhancement factor of the ATNA substrates excited via the focused LPB and AVB. Transverse-electric-field intensity distributions of the focused (a) LPB and (b) AVB, under conditions of NA = 0.8 and λ = 633 nm . Sketch map of the ATNA substrates excited via (c) LPB and (d) AVB. Electric-field intensity distribution on the surface of ATNA substrates, with D = 600 nm , excited via (e) LPB and (f) AVB. Electric-field intensity distribution on the surface of the ATNA substrates, with (g) D = 300 nm and (h) 400 nm, excited via AVB.

Fig. 4. SERS sensitivity examination of the ATNA substrate with D = 600 nm . (a) Raman spectra of R6G, with concentration from 10 − 8 M down to 10 − 12 M , absorbed on the surface of the ATNA substrates and excited via LPB. (b) Raman spectra of R6G, with concentration of 10 − 11 M , excited via AVB (blue curve) and LPB (red curve). (c) Raman spectra of R6G, with concentrations of 10 − 12 M and 10 − 13 M , excited via the focused AVB.

Fig. 5. SERS sensitivity examination of the ATNA substrate with D = 400 nm . (a) Raman spectra of R6G, with concentration from 10 − 9 M down to 10 − 11 M , absorbed on ATNA substrate and excited via LPB. (b) Raman spectra of R6G, with concentrations of 10 − 11 , 10 − 12 , and 10 − 13 M , excited via AVB.
![Examination of SERS uniformity and Raman enhancement factor of the ATNA substrate with D=600 nm. (a) Schematic diagram of Raman mapping excited via AVB; (b) Raman imaging within a square of 15 μm×15 μm using the characteristic peak of 1511 cm−1 [inset in (d)] of R6G with a concentration of 10−8 M; (c) histogram of the intensities of the 1511 cm−1 characteristic peak obtained along the white curve in (b); (d) Raman spectra of R6G with concentrations of 10−8 M (red curve) and 10−1 M (black curve) on the ATNA substrate and a glass slide, respectively.](/Images/icon/loading.gif)
Fig. 6. Examination of SERS uniformity and Raman enhancement factor of the ATNA substrate with D = 600 nm . (a) Schematic diagram of Raman mapping excited via AVB; (b) Raman imaging within a square of 15 μm × 15 μm using the characteristic peak of 1511 cm − 1 [inset in (d)] of R6G with a concentration of 10 − 8 M ; (c) histogram of the intensities of the 1511 cm − 1 characteristic peak obtained along the white curve in (b); (d) Raman spectra of R6G with concentrations of 10 − 8 M (red curve) and 10 − 1 M (black curve) on the ATNA substrate and a glass slide, respectively.

Fig. 7. Examination of reproducibility of ATNA substrates excited via AVB. (a) Raman spectra of R6G with a concentration of 10 − 9 M obtained from five ANTA substrates with D = 600 nm . (b) Histogram of intensities of the 1511 cm − 1 characteristic peak shown in (a).

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