An Easy-to-Integrate Embedded Cascade Microspheres for Efficient Local Field Enhancement

Qiyu Chen

doi:10.62051/kprc9y57

Authors

Qiyu Chen

DOI:

https://doi.org/10.62051/kprc9y57

Keywords:

Surface-Enhanced Raman Spectroscopy, Microspheres, Photonic Nanojet, Cascade Microspheres.

Abstract

Surface-enhanced Raman spectroscopy (SERS) is a non-destructive and ultra-sensitive tool for optical trace detection. However, the complex manufacturing process hinders the application of SERS. For this reason, an embedded cascaded microsphere structure is proposed in this paper, which is easy to integrate and process. Such a structure is composed of large microspheres and small microspheres with micropores cascaded. More importantly, the micropore diameter at the bottom of the large microspheres is the same as that of the small microspheres. Through the finite element analysis, it is concluded that compared with a single microsphere, the photonic nanojet generated by this structure is stronger, which can achieve local electric field enhancement more effectively. Meanwhile, different materials of the cascade microspheres used in the embedded cascade have various reinforcement effects. In addition, compared with the manual physical alignment of two microspheres in the traditional cascade structure, this structure is easier to process and integrate, convenient for future integrated applications.

Downloads

Download data is not yet available.

References

R. R. Jones, D. C. Hooper, L. W. Zhang, D. Wolverson, and V. K. Valev, "Raman Techniques: Fundamentals and Frontiers," (in English), NANOSCALE RESEARCH LETTERS, vol. 14, JUL 12 2019, Art no. 231, doi: 10.1186/s11671-019-3039-2.

N. P. W. Pieczonka and R. F. Aroca, "Single molecule analysis by surfaced-enhanced Raman scattering," (in English), Chem Soc Rev, vol. 37, no. 5, pp. 946-954, 2008, doi: 10.1039/b709739p.

J. Langer et al., "Present and Future of Surface-Enhanced Raman Scattering," (in English), Acs Nano, vol. 14, no. 1, pp. 28-117, Jan 2020, doi: 10.1021/acsnano.9b04224.

H. L. Wang, E. M. You, R. Panneerselvam, S. Y. Ding, and Z. Q. Tian, "Advances of surface-enhanced Raman and IR spectroscopies: from nano/microstructures to macro-optical design," (in English), LIGHT-SCIENCE & APPLICATIONS, vol. 10, no. 1, AUG 4 2021, Art no. 161, doi: 10.1038/s41377-021-00599-2.

C. L. Du, J. Kasim, Y. M. You, D. N. Shi, and Z. X. Shen, "Enhancement of Raman scattering by individual dielectric microspheres," (in English), J Raman Spectrosc, vol. 42, no. 2, pp. 145-148, Feb 2011, doi: 10.1002/jrs.2684.

K. J. Yi, H. Wang, Y. F. Lu, and Z. Y. Yang, "Enhanced Raman scattering by self-assembled silica spherical microparticles," (in English), J Appl Phys, vol. 101, no. 6, Mar 15 2007, doi: Artn 06352810.1063/1.245067