Nanostructured surfaces

Theoretical modeling of plasmon resonance in structures with metal nanoparticles on the surface
Havryliuk O.O. 1, Semchuk O.Yu. 1, Evtukh A.A.2, Pylypova O.V.3, 
Biliuk А.А. 1

1 Chuiko Institute of Surface Chemistry NAS of Ukraine. 17 Ganeral Naumova Str., Kyiv-03164, Ukraine. 
E-mail: gavrylyuk.oleksandr@gmail.com
2 V. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine. 41 pr. Nauki,  Kyiv-03028, Ukraine. 
3 Institute of High Technologies, Taras Shevchenko National University of Kyiv. 60 Volodymyrska Str, Kyiv-01033, Ukraine

Silicon nanostructures have attracted a great deal of attention and interest because of their potential applications in various fields, such as nanoelectronics, optoelectronics, energy storage, and energy conversion and in biological and chemical sensors. 
Many researches have simulated the optical properties of nanowires. But in this work, we first consider some theoretical calculations of localized surface plasmon resonance  (LSPR)  of silicon nanowires with silver nanoparticles.
Surface plasmons are coherent electron oscillations behaving as localized and propagated modes in metal nanoparticles and nanowires, respectively. 
As the diameter of the nanowires increases, the transmittance in the shortwave region decreases. There is also a clear decrease in the transmittance at the plasmon resonance frequency. For the nanowire diameter of 100 nm, the peak of the plasmon resonance is at a wavelength of 860 nm. As the nanowires diameter increases, this peak shifts from 840-850 nm (for nanowires with a diameter of 50-80 nm) to 860 nm (for nanowires with a diameter of 100 nm).
It should be noted that for a structure with 100 nm nanowires and a diameter of 50 nm nanoparticles at the plasmon resonance frequency, the transmittance is at least ~ 20% when for other combinations of the structure it is ~ 40-50%.
In further studies, it is planned to calculate the gain of such structures with and without metal nanoparticles. And also to compare the characteristics of these solar cells with existing analogues.