Prof. Wojciech Nasalski, Ph.D., Dr. Habil.

Department of Theory of Continuous Media and Nanostructures (ZTOCiN)
Nanophotonics (ZeBN)
position: professor
telephone: (+48) 22 826 12 81 ext.: 189
room: 337
e-mail: wnasal
personal site: http://bluebox.ippt.pan.pl/~wnasal/

Doctoral thesis
1975Kwantowanie pól sprężystych 
supervisor -- Prof. Henryk Zorski, Ph.D., Dr. Habil., Eng., IPPT PAN
268 
Habilitation thesis
1991Niespekularne odbicie pola elektromagnetycznego na granicy dwu dielektryków 
Professor
2009-06-17Title of professor
Supervision of doctoral theses
1.2012-06-28Roszkiewicz Agata Generacja plazmonów polarytonów powierzchniowych na strukturach periodycznych650
 
2.1995Burak Dariusz  Propagacja solitonów przestrzennych generowanych wiązkami Gaussa w nieliniowym ośrodku Kerra 

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., 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
3.Nasalski W., Vortex and anti-vortex compositions of exact elegant Laguerre–Gaussian vector beams, APPLIED PHYSICS B-LASERS AND OPTICS, ISSN: 0946-2171, DOI: 10.1007/s00340-014-5820-3, Vol.115, pp.155-159, 2014
Abstract:

Reformulation of conventional beam definitions into their bidirectional versions and use of Hertz potentials make beam fields exact vector solutions to Maxwell’s equations. This procedure is applied to higher-order elegant Laguerre–Gaussian beams of transverse magnetic and transverse electric polarization. Their vortex and anti-vortex co-axial compositions of equal and opposite topological charges are given in a closed analytic form. Polarization components of the composed beams are specified by their radial and azimuthal indices. The longitudinal components are common for beam compositions of both types; meanwhile, their transverse components are different and comprise two—nonparaxial and paraxial—separate parts distinguished by a paraxial parameter and its inverse, respectively. The new solutions may appear useful in modeling and tailoring of arbitrary vector beams.

Affiliations:
Nasalski W.-IPPT PAN
4.Nasalski W., Exact elegant Laguerre-Gaussian vector wave packets, OPTICS LETTERS, ISSN: 0146-9592, DOI: 10.1364/OL.38.000809, Vol.38, No.6, pp.809-811, 2013
Abstract:

An exact closed-form representation is derived of a vector elegant Laguerre–Gaussian wave packet. Its space–time representation consists of three mutually orthogonal field components—of a common azimuthal index and different radial indices—uniquely distinguished by first three powers of the paraxial parameter. The transverse components are of tm-radial and te-azimuthal polarization and appear, under their normal incidence, to be eigenmodes of any horizontally planar, homogeneous and isotropic structure, with eigenvalues given by the reflection and transmission coefficients. In this context, the interrelations between the cross-polarization symmetries of wave packets in free space and at medium planar interfaces are discussed.

Affiliations:
Nasalski W.-IPPT PAN
5.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
6.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
7.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
8.Szabelak W., Nasalski W., Enhancement of cross-polarized beam components at a metamaterial surface, APPLIED PHYSICS B-LASERS AND OPTICS, ISSN: 0946-2171, Vol.103, No.2, pp.369-375, 2011
9.Szabelak W., Nasalski W., Cross-polarization coupling and switching in an open nano-meta-resonator, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, ISSN: 0953-4075, Vol.44, pp.215403-1-10, 2011
10.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
11.Nasalski W., Elegant Hermite-Gaussian and Laguerre-Gaussian beams at a dielectric interface, OPTICA APPLICATA, ISSN: 0078-5466, Vol.40, No.3, pp.615-622, 2010
12.Nasalski W., Cross-polarized normal mode patterns at a dielectric interface, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, Vol.58, No.1, pp.141-154, 2010
13.Szabelak W., Nasalski W., Transmission of Elegant Laguerre-Gaussian beams at a dielectric interface - numerical simulations, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, Vol.57, No.2, pp.181-188, 2009
14.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
15.Nasalski W., Pagani Y., Excitation and cancellation of higher-order beam modes at isotropic interfaces, JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS, ISSN: 1464-4258, DOI: 10.1088/1464-4258/8/1/004, Vol.8, pp.21-29, 2006
Abstract:

The phenomenon of excitation and cancellation of higher-order elegant Hermite–Gaussian and Laguerre–Gaussian three-dimensional beams, induced at a dielectric isotropic interface by cross-polarization coupling, is analysed. The cross-polarization effect depends quantitatively on interrelations between beam field spatial distribution and beam polarization. These relations are derived for two basic cases of linear and circular polarization and confirmed by numerical simulations.

Affiliations:
Nasalski W.-IPPT PAN
Pagani Y.-IPPT PAN
16.Nasalski W., Polarization versus spatial characteristics of optical beams at a planar isotropic interface, PHYSICAL REVIEW E, ISSN: 1539-3755, Vol.74, pp.56613-1-16, 2006
17.Pagani Y., Nasalski W., Diagonal relations between elegant Hermite-Gaussian and Laguerre-Gaussian beam fields, OPTO-ELECTRONICS REVIEW, ISSN: 1230-3402, Vol.13, No.1, pp.51-60, 2005
18.Burak D., Nasalski W., Excitation of Optical Solitons by Higher-order Hermite-Gaussians, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.12, pp.1-33, 1995
19.Burak D., Nasalski W., Soliton Formation from the incident Gaussian Beam in Kerr Medium, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.35, pp.1-14, 1991
20.Nasalski W., Samborski W., Transfer Matrix for the Nonspecular Diffraction of Gaussian Beams, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.42, pp.1-11, 1991
21.Samborski W., Nasalski W., Transfer and Scattering Matrix Analyses of Reflection and Transmission at Multilayered Media, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.30, pp.1-20, 1990
22.Nasalski W., Niespekularne odbicie pola elektromagnetycznego na granicy dwu dielektryków (Praca habilitacyjna), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.32, pp.1-152, 1990
23.Burak D., Nasalski W., Optyczny czujnik odbiciowy - zasady działania i własności, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.19, pp.1-25, 1989
24.Nasalski W., Macierz rozpraszania dla skokowych nieciągłości falowodów planarnych, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.9, pp.1-25, 1988
25.Nasalski W., Nonspecular Reflection Phenomena at Linear Dielectric Interfaces, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.48, pp.1-35, 1988
26.Nasalski W., Metoda Wienera-Hilberta w analizie skokowych nieciągłości falowodów otwartych, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.6, pp.1-32, 1986
27.Nasalski W., The Exact Surface Impedance Approach to Problems of Diffraction in Open Waveguides, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.2, pp.1-23, 1984
28.Nasalski W., Analiza modowa pola elektromagnetycznego planarnych falowodów anizotropowych, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.22, pp.1-23, 1982
29.Nasalski W., Dyfrakcja fali niejednorodnej na półpłaszczyźnie impedancyjnej, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.16, pp.1-24, 1980
30.Nasalski W., Dyfrakcja elektromagnetycznych fal powierzchniowych na półpłaszczyźnie impedancyjnej, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.32, pp.1-28, 1980
31.Juszkiewicz A., Nasalski W., Cieczowy przetwornik akustooptyczny w holografii ultradźwiękowej, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.50, pp.1-44, 1978
32.Nasalski W., Zewnętrzne źródła termiczne w kwantowej teorii sprężystości, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.30, pp.1-58, 1977

List of recent monographs
1.
75
Nasalski W., Optical beams at dielectric interfaces - fundamentals, Trends in Mechanics of Materials, IPPT PAN (Warszawa), pp.1-282, 2007

Conference papers
1.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
2.Szabelak W., Nasalski W., Excitation of optical vortices at a dielectric interface versus a beam incidence angle, 16th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2008-08-08/08-12, Polanica Zdrój (PL), DOI: 10.1117/12.822386, Vol.7141, pp.714115-1, 2008
Abstract:

Behaviour of Laguerre{Gaussian beams (optical vortices are their attributes) impinged at a dielectric interface under distinct angles is discussed. For different incident angles the beams interact with the interface differently. Two ranges of incident angles, specified by diverse optical vortices excitation which is caused by cross-polarization effect, is analyzed. "Significant" boundary between these two ranges is defined. Theoretical analyses are confirmed by numerical simulations.

Affiliations:
Szabelak W.-IPPT PAN
Nasalski W.-IPPT PAN
3.Nasalski W., Pagani Y., Cross-polarization coupling of Laguerre-Gaussian beam modes at isotropic interfaces, Conference on Nanophotonics, 2006-04-03/04-05, Strasbourg (FR), DOI: 10.1117/12.663040, Vol.6195, pp.61950L, 2006
Abstract:

Excitation and cancellation of higher-order elegant Hermite-Gaussian and Laguerre-Gaussian beams under normal incidence at isotropic, lossless, dielectric interfaces are analysed. It is shown that such phenomena are originated in the cross-polarization coupling between orthogonal polarization components of the beams and depend qualitatively on interrelations between beam field spatial distribution and beam polarization. For Lagueffe-Gaussian beams these interrelations associate beam orbital and spin angular momenta. Analytic description confirmed by numerical simulations is given for transmission of two types of beams: Hermite-Gaussians of linear polarization and LagueffeGaussians of circular polarization.

Keywords:

refraction, reflection, cross-polarization, elegant Hermite-Gaussian and Laguerre-Gaussian beams

Affiliations:
Nasalski W.-IPPT PAN
Pagani Y.-IPPT PAN

Conference abstracts
1.Nasalski W., Elegant vector Laguerre-Gaussian beams as normal modes at planar photonic structures, QCQI2016, EMN Meeting on Quantum Communication and Quantum Imaging-2016, 2016-08-23/08-26, Berlin (DE), Vol.1, pp.27-28, 2016