ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarVlatko GašparićRuđer Bošković Institute, Croatia (host: Veres 
Miklós)Photonic nanojet and its application in Raman spectroscopyTuesday, 26 
March 2024, 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference RoomRaman 
spectroscopy is a popular and widely used method for substance identification 
and characterization, however, due to the inelasticity of the Raman 
scattering, its signal is weak. Therefore, many methods of enhancement have 
been developed over the years. One of the newest methods is based on a 
photonic nanojet, which is gaining popularity and attention from the 
scientific community in recent time. The photonic nanojet is a narrow and 
intense beam of light produced by illuminating a dielectric microlens in 
suitable conditions.After the motivation and general concepts are laid out, 
some research highlights so far will be presented. The optimization of the 
enhancement show that the incident beam position is one of the key parameters 
for the enhancement [1]. The Generalized Lorenz-Mie theory calculations of 
the photonic nanojet show great dependence of its properties on given 
parameters [2]. Also, a device for the enhanced mapping [3], the expansion of 
the upper limit of the refractive index for photonic nanojet generation [4], 
and effective numerical aperture model will be presented.Lastly, the plans 
for the investigation of combined plasmonic and photonic nanojet enhancement, 
and determination of trends in photonic nanojet properties will be 
presented.[1] V. Gašparić, S. Taccheo, H. Gebavi, D. Ristić, M. Ivanda; 2020, 
Journal of Raman spectroscopy, 51, p165-175, "Photonic nanojet mediated Raman 
enhancement: Vertical Raman mapping and simple ray matrix analysis"[2] V. 
Gašparić, D. Ristić, T. G. Mayerhöfer, N. Baran, H. Gebavi, A. Maksimović, M. 
Ivanda; 2022, Journal of Quantitative Spectroscopy and Radiative Transfer, 
282, p108121, "Photonic Nanojet of a Gaussian Beam Illuminated Low Refractive 
Index Microsphere in Air: a Comprehensive Variation of Parameters"[3] V. 
Gašparić, D. Ristić, H. Gebavi, M. Ivanda; 2021, Applied surface science, 
545, p149036, "Resolution and signal enhancement of Raman mapping by photonic 
nanojet of a microsphere"[4] V. Gašparić, T. G. Mayerhöfer, D. Zopf, D. 
Ristić, J. Popp, M. Ivanda; 2022, Optics Letters, 47, p2534-2537, "To 
generate a photonic nanojet outside a high refractive index microsphere 
illuminated by a Gaussian beam" Minden érdeklődőt szívesen látunk! - 
Everyone is welcome to attend.Attila Nagysem-admin AT szfki.hu