Agata Roszkiewicz-Walczuk, Ph.D., Eng.

Department of Theory of Continuous Media and Nanostructures (ZTOCiN)
Nanophotonics (ZeBN)
position: assistant professor
telephone: (+48) 22 826 12 81 ext.: 460
room: 341
e-mail: arosz

Doctoral thesis
2012-06-28Generacja plazmonów polarytonów powierzchniowych na strukturach periodycznych 
supervisor -- Prof. Wojciech Nasalski, Ph.D., Dr. Habil., IPPT PAN
650
 
Recent publications
1.Roszkiewicz A., Nasalski W., Transmission and reflection properties of two-dimensional finite metal crystals, EUROPEAN PHYSICAL JOURNAL D, ISSN: 1434-6060, DOI: 10.1140/epjd/e2017-70706-9, Vol.71, No.182, pp.1-12, 2017
Abstract:

Optical characteristics of a finite two-dimensional silver stripe photonic crystal of a square lattice are numerically analysed with use of multilayer Rigorous Coupled Wave Analysis. Qualitative changes in optical response of the crystal originated from modifications of the thickness and filling factors of each layer and the polarization direction of the incident wave are shown. The crystal manifests its various characteristics in wideband or narrowband reflection and transmission, while absorption remains low. The behaviour of the crystal is determined by its structure geometry yielding excitation of localized plasmons and collective modes together with interactions between them. The optical response of the square lattice structure is also compared with the response of a triangular lattice crystal.

Affiliations:
Roszkiewicz A.-IPPT PAN
Nasalski W.-IPPT PAN
2.Roszkiewicz A., Extended broadband absorption in the visible range with use of the metallodielectric grating structure, Journal of Optics, ISSN: 2040-8978, DOI: 10.1088/2040-8978/17/2/025003, Vol.17, No.2, pp.025003-1-7, 2015
Abstract:

This paper presents an analysis of phenomena leading to high and broadband absorption by a structure composed of three elements: two one-dimensional metal and dielectric diffraction gratings and a thick metal layer. A broad spectrum of high absorption in such a structure is attributed to three factors. First, proper design of the structure enables the use of three types of resonances excited at neighboring frequencies: horizontal cavity modes in the dielectric resonators between the metal grating and the metal substrate, vertical cavity modes between the metal strips, and localized surface plasmons excited at the tops of the metal strips and at the bottoms of the vertical cavities. Second, each period of the dielectric grating is built from five strips of identical dimensions but different dielectric constants, which results in frequency splitting due to the different resonance conditions in particular horizontal cavities. Third, the order of the resonators is changed, which assures better coupling efficiency between existing resonances.

Affiliations:
Roszkiewicz A.-IPPT PAN
3.Roszkiewicz A., Nasalski W., Optical beam interactions with a periodic array of Fresnel zone plates, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN: 0953-4075, DOI: 10.1088/0953-4075/47/16/165401, Vol.47, pp.165401-1-9, 2014
Abstract:

The interactions of first-order elegant Laguerre–Gaussian beams (ELG) with a two-dimensional periodic array are analysed theoretically and numerically. The structure consists of a periodic composition of two-zone Fresnel plates engraved in a silver film. The beam field is composed of periodic sequences of beams of circular or polar polarization incidence upon the structure. The beam axes coincide with the symmetry axes of every fourth Fresnel zone plate placed periodically along two orthogonal coordinates of a horizontal plane of the structure. It is shown that the beam-structure interaction results in substantial cross-polarization coupling, higher-order mode excitation, strong focussing and the extraordinary transmission of the optical field. An interpretation of the results is given per an analogy to the beam-structure interactions observed at planar, homogeneous and isotropic dielectric interfaces and layers.

Affiliations:
Roszkiewicz A.-IPPT PAN
Nasalski W.-IPPT PAN
4.Roszkiewicz A., Nasalski W., Resonant transmission enhancement at one-dimensional metal gratings, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN: 0953-4075, DOI: 10.1088/0953-4075/46/2/025401, Vol.46, pp.1-6, 2013
Abstract:

An analysis of phenomena leading to high transmission at a one-dimensional metal grating is presented. It is shown that high resonant transmission can be obtained either for thick or thin gratings for a wide range of filling factors and that the origins of the enhanced transmission are different in each case. We analyse the optical response of structures with subwavelength slits and of various thicknesses. The role of different pure (dielectric cavity modes, surface plasmon polaritons) and coupled resonances on the enhanced transmission is presented.

Affiliations:
Roszkiewicz A.-IPPT PAN
Nasalski W.-IPPT PAN
5.Roszkiewicz A., Nasalski W., Extraordinary optical transmission and vortex excitation by periodic arrays of Fresnel zone plates, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.2478/bpasts-2013-0092, Vol.61, No.4, pp.855-861, 2013
Abstract:

Extraordinary optical transmission and good focusing properties of a two-dimensional scattering structure is presented. The structure is made of Fresnel zone plates periodically arranged along two orthogonal directions. Each plate consists of two ring-shaped waveguides supporting modes that match the symmetry of a circularly polarized incident plane wave. High field concentration at the focal plane is obtained with the short transverse and long longitudinal foci diameters. Optical vortex excitation in a paraxial region of the transmitted field is also observed and analysed in terms of cross-polarisation coupling. The structure presented may appear useful in visualization, trapping and precise manipulations of nanoparticles.

Keywords:

Fresnel zone plates, focusing, cross-polarisation coupling, optical vortices

Affiliations:
Roszkiewicz A.-IPPT PAN
Nasalski W.-IPPT PAN
6.Roszkiewicz A., Nasalski W., Reflection suppression and absorption enhancement of optical field at thin metal gratings with narrow slits, OPTICS LETTERS, ISSN: 0146-9592, Vol.37, No.18, pp.3759-3761, 2012
7.Roszkiewicz A., Nasalski W., Unidirectional SPP excitation at asymmetrical two-layered metal gratings, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN: 0953-4075, Vol.43, pp.185401-1-8, 2010
8.Roszkiewicz A., Szabelak W., Nasalski W., Surface plasmon polariton applications in selected branches of modern science and technology, JOURNAL OF TECHNICAL PHYSICS, ISSN: 0324-8313, Vol.50, pp.40253-0, 2009
9.Kos A., Tefelski D.B., Kościesza R., Rostocki A.J., Roszkiewicz A., Ejchart W., Jastrzębski C., Siegoczyński R.M., Certain physico-chemical properties of triolein and methyl alcohol–triolein mixture under pressure, HIGH PRESSURE RESEARCH, ISSN: 0895-7959, Vol.27, No.1, pp.39-42, 2007

List of recent monographs
1.
316
Roszkiewicz A., Generacja plazmonów polarytonów powierzchniowych na strukturach periodycznych, rozprawa doktorska, IPPT Reports on Fundamental Technological Research, 3, pp.1-166, 2013

Conference papers
1.Roszkiewicz A., Broadband absorption in the cavity resonators with changed order, PHOTOPTICS 2015, 3rd International Conference on Photonics, Optics and Laser Technology, 2015-03-12/03-13, Berlin (DE), DOI: 10.5220/0005332900810086, pp.81-86, 2015
Abstract:

This paper presents an analysis of phenomena leading to high and broadband absorption at a structure combined of three elements: one-dimensional dielectric diffraction grating placed between silver grating and a thick silver substrate. Each element of the dielectric grating consists of media of different dielectric constants but of the same geometrical dimensions. A broad spectrum of high absorption in such a structure is achieved as a result of two issues. First, due to the different excitation conditions the cavity resonances are excited at different wavelengths. Second, the changed order of the resonators leads to further broadening of the absorption band.

Keywords:

Broadband Absorption, Enhanced Absorption, Localized Surface Plasmons, Cavity Resonances, Diffraction Gratings

Affiliations:
Roszkiewicz A.-IPPT PAN
2.Roszkiewicz A., Nasalski W., Unidirectional surface plasmon polariton excitation at asymmetrical periodic metallodielectric multilayers, Conference on Nanophotonics IV, 2012-04-15/04-19, Brussels (BE), DOI: 10.1117/12.921798, Vol.8424, pp.842426-1-11, 2012
Abstract:

A new configuration of the one-dimensional reflective asymmetrical metallodielectric grating structure for unidirectional excitation of surface plasmon polaritons (SPPs) is proposed. The structure is embedded between two different dielectric media and composed of two 1D metallic gratings each of the two consisted of periodically placed rectangular metal stripes. The case of normal incidence is analysed. It is shown that even a small horizontal shift between these two layers or a change in dielectric contrast of the grating fillings, the structure may redirect an energy flow of the SPP in the near field. An explanation of this unidirectional SPP excitation is given. Besides the SPP excitation by a plane wave, the excitation by a finite-diameter 3D Gaussian beam is analysed as well, as the beam facilitates visualisation of the SPP finite propagation length and efficiency of the directivity switch. It is shown that the switching phenomenon exists together with a high concentration of the electromagnetic field at the structure, the feature especially desirable in techniques of subwavelength nanovisualisation. The configurations analysed may be also useful in designing optical devices as optical switches, VLSI devices, light harvesting photodetector structures or, in general, in any case where efficient control of energy propagation directivity is of primary importance.

Keywords:

Surface plasmon polaritons, planar metallic gratings, plasmonic structures, unidirectional excitation and propagation

Affiliations:
Roszkiewicz A.-IPPT PAN
Nasalski W.-IPPT PAN