Influence of Matrix Absorption on Spectral and Near-Field Characteristics of Plasmon Resonances of Silver Nanoparticles

The paper presents the results of calculations of the spectral dependences of the extinction efficiency factors Q_ext, near-field enhancement Q_NF, and absorption Q_abs for spherical silver nanoparticles (radii of 5, 15.5, and 35 nm) performed using the extended Mie theory. The particles were considered in transparent  (κ = 0) and absorbing (κ = 0.05 and 0.2) matrixes with a high refractive index of n_m = 2.0. It was found that even a small absorption in the matrix leads to a significant decrease in the maxima of Q_ext and, especially, Q_NF. In this case, the position of Q_ext peaks remains virtually unchanged, while a slight long-wavelength shift is observed for Q_NF. It is shown that for particles with the radius of 35 nm at κ0.05, the maxima of Q_NF and Q_abs factors in the quadrupole mode region significantly prevail over the dipole ones, which is not typical for the extinction factor Q_ext. Significant differences in the spectra and near-field distributions of nanoparticles in real absorbing media (CuPc and NiPc) were revealed. Despite the chemical similarity of the molecules, the dispersion of their refractive indices leads to radically different optical responses of the hybrid system.

1. U. Kreibig, M. Vollmer. Optical Properties of Metal Clusters, Berlin, Springer (1995)

2. В. В. Климов. Наноплазмоника, Москва, Физматлит (2009)

3. S. V. Gaponenko, D. V. Guzatov. Proc. IEEE, 108, N 5 (2020) 704—720

4. В. С. Лебедев, А. Д. Кондорский. УФН, 195, № 1 (2025) 50—93

5. R. Jiang, B. Li, C. Fang, J. Wang. Adv. Mater., 26, N 31 (2014) 5274—5309

6. V. K. Narasimhan, T. M. Hymel, R. A. Lai, Y. Cui. ACS Nano, 9, N 11 (2015) 10590—10597

7. А. Д. Помогайло, А. С. Розенберг, И. Е. Уфлянд. Наночастицы металлов в полимерах, Москва, Химия (2000)

8. S. I. Lepeshov, A. E. Krasnok, P. A. Belov, A. E. Miroshnichenko. Phys. Usp., 61, N 11 (2018) 1035—1050

9. О. В. Буганов, А. Д. Замковец, А. Н. Понявина, С. А. Тихомиров. Журн. прикл. спектр., 81, № 1 (2014) 93—98 [O. V. Buganov, A. D. Zamkovets, A. N. Ponyavina, S. A. Tikhomirov. J. Appl. Spectr., 81, N 1 (2014) 92—96]

10. А. В. Поволоцкая, А. В. Поволоцкий, А. А. Маньшина. Успехи химии, 84, № 6 (2015) 579—600

11. G. A. Wurtz, P. R. Evans, W. Hendren, R. Atkinson, W. Dickson, R. J. Pollard,A. V. Zayats, W. Harrison, C. Bower. Nano Lett., 7, N 5 (2007) 1297—1303

12. Р. А. Дынич, А. Н. Понявина, В. В. Филиппов. Журн. прикл. спектр., 76, № 5 (2009) 746—751 [R. A. Dynich, A. N. Ponyavina, V. V. Filippov. J. Appl. Spectr., 76, N 5 (2009) 705—710]

13. Р. А. Дынич, А. Н. Понявина, В. В. Филиппов. Опт. и спектр., 110, № 6 (2011) 909—915

14. P. B. Johnson, R. W. Christy. Phys. Rev. B, 6, N 12 (1972) 4370—4379

15. U. Kreibig, C. v. Fragstein. Z. Phys., 224, N 4 (1969) 307—323

16. M. M. El-Nahass, K. F. Abd-El-Rahman, A. A. M. Farag, A. A. A. Darwish. Int. J. Mod. Phys. B, 18, N 3 (2004) 421—434

17. C. C. Leznoff, A. B. P. Lever. Phthalocyanines: Properties and Applications, Vol. 4, New York, VCH (1996)

18. B. J. Messinger, K. U. von Raben, R. K. Chang, P. W. Barber. Phys. Rev. B, 24, N 2 (1981) 649—657

19. Р. А. Дынич, А. Н. Понявина. Журн. прикл. спектр., 90, № 5 (2023) 728—737 [R. A. Dynich, A. N. Ponyavina. J. Appl. Spectr., 90, N 5 (2023) 1019—1028]

20. А. Д. Замковец, С. М. Качан, А. Н. Понявина. Журн. прикл. спектр., 75, № 4 (2008) 568—572 [A. D. Zamkovets, S. M. Kachan, A. N. Ponyavina. J. Appl. Spectr., 75, N 4 (2008) 588—592]

21. С. А. Кукушкин, А. В. Осипов. УФН, 168, № 10 (1998) 1083—1116