Nanoplasmonics and surface enhanced spectroscopy

Spectral quality factor of sensory sensing elements on SPR in the form of metal nanowire
Lutsenko Yu.I.1, Karandas Ya.V.1, Korotun A.V.1
1 National University ”Zaporizhzhia Polytechnic“,
Zhukovskogo st., 64, Zaporizhzhia, Ukraine.
E-mail: andko@zp.edu.ua

The rapid development of nanotechnology has led to a shift in sensory research towards nanometer scales [1]. In particular, SPR sensors have become widely used, which make it possible to detect very small amounts of substances and adapt to the analysis of a wide range of different chemical and biological objects.
Modern technologies allow the use of metal nanoparticles as sensitive elements. For optimal selection of nanoparticles use such characteristics as figure of merit:
,			(1)
where  – effective relaxation rate,
			(2)
– spectral sensitivity.
In expression (2)  – SPR frequency,  – dielectric constant of the environment.
Note that due to the fact that 1D-structures are asymmetric, they excite longitudinal and transverse surface plasmons, and, accordingly, spectral sensitivity, effective relaxation rate and spectral quality factor are diagonal tensors of the second rank:
,			(3)
.			(4)

1.	Mejía-Salazar J. R., Camacho S. A., Constantino C. J. L., Oliveira Junior O. N. New trends in plasmonic (bio)sensing // An. Acad. Bras. Cienc.-2018.-90.-P. 779–801.