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1
Content available remote

Gas Sensors Based on ZnO Structures

100%
Struk P., Pustelny T., Gołaszewska K., Borysiewicz M., Piotrowska A.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
567-569
EN
The paper presents the results of investigations concerning sensor structures based on porous layers of zinc oxide (ZnO) sensitive to a selected gaseous environment. The investigations comprised analyses of the influence of the gaseous environment on the optical properties of a sensor structure, in particularly on the change of the spectral characteristics of optical transmission within the range of ultraviolet light and in the visible range. These presented investigations were carried out in such a gaseous environment as nitrogen dioxide NO_2 in synthetic air.
2
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Zinc Oxide Semiconductor for Photonics Structures Applications

100%
Struk P., Pustelny T., Pustelny B., Gołaszewska K., Kamińska E., Piotrowska A., Borysiewicz M., Ekielski M.
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issue 6
1242-1245
EN
The paper presents investigations concerning the analysis of photonic structures with grating couplers. In the paper basic theoretically information on photonic structures with grating couplers is presented. The results of numerical investigations on photonic structures with grating couplers are discussed, too. Investigations show an essential influence of the geometrical parameters of grating couplers on the effectiveness of the input and output of optic power into and out of this photonic structure. In the paper the selected results of experimental realizations of photonic structures with grating couplers based on zinc oxide ZnO are presented.
3
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Researches on the Spectral Transmittance of Zinc Oxide ZnO Semiconductor Layers

100%
Struk P., Pustelny T., Opilski Z.
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issue 6
1239-1241
EN
The paper deals with investigations concerning a wide-band gap material, viz. zinc oxide ZnO. Special attention has been devoted to the determination of the spectral transmission of zinc oxide layers deposited on quartz substrates. These investigations have made it possible to determine the optical spectral range in which this material is transparent as well as the edges of absorption. The presented investigations are valuable particularly concerning the application of zinc oxide in optoelectronic and photonic structures as well as in systems of waveguides and sensor layers of integrated optics.
4
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Comparison of Methods for Determining the Contrast Distribution in Interference Images with Speckle Noise

100%
Pyziak L., Matczak M., Zięba P.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
173-175
EN
Information about certain physical states of an examined object is encoded in the distribution of the fringe contrast in the metrological interference images of the object. Determining the contrast is one of the steps of converting the image into the distribution of the measured quantity in holographic fringe-contrast interferometry. In this paper, three methods of determining the fringe contrast in interference images containing speckle noise are compared. As the criterion for comparing the methods, the mean absolute error has been used. It turns out, in accordance with this criterium, the most effective method is the phase-shifting one.
5
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Anderson Localization of Electromagnetic Waves in Dielectric Media: Model Studies

100%
Rusek M., Orłowski A.
Acta Physica Polonica A
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2006
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vol. 109
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issue 1
109-119
EN
Anderson localization of electromagnetic waves in random arrays of dielectric cylinders confined within a planar metallic waveguide is studied. The disordered dielectric medium is modeled by a system of randomly distributed 2D electric dipoles. An effective theoretical approach based on the method of images is developed. A clear distinction between isolated localized waves (which exist in finite media) and the band of localized waves (which appears only in the limit of the infinite medium) is presented. The Anderson transition emerging in the limit of an infinite medium is observed both in finite size scaling analysis of transmission and in the properties of the spectra of some random matrices. The sound physical interpretation of the obtained results suggests deeper insight into the existing experimental and theoretical work.
6
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Resonance Fluorescence Spectrum of Two-Level Atoms Driven by Two Noncollinear Classical Fields

100%
Łobodziński B.
Acta Physica Polonica A
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1997
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vol. 92
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issue 3
501-506
EN
The resonance fluorescence spectrum of an ensemble of two-level atoms driven by two classical, frequency degenerate and noncollinear laser beams is investigated. It has been found that the spatially-averaged resonance fluorescence spectra differ significantly from the spectra of two-level atoms calculated for the single-beam excitation. The differences were noticed in the number of peaks, their positions and shapes and in their dependences on an angle between wave vectors of the incident beams.
7
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The Sensitivity of Composite Bimodal Waveguide SU-8

100%
Gut K.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
602-605
EN
This paper presents the results of measurements of the refractive index and thickness of the waveguide layer SU-8. The mode sensitivity has been calculated as a function of the thickness in a bimodal structure. The differential interference was analyzed concerning modes of the same types TE_0-TE_1 and TM_0-TM_1 and modes of the same order (TE_0-TM_0, TE_1-TM_1). The thickness of the layer was determined when the interferometer is most sensitive to changes of the refractive index. It has been proved that the sensitivity of the structure can be increased by adding a nanometric layer with a high refraction index (n_{A}=1.975) on the waveguide layer.
8
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Imaging and Patterning on Nanometer Scale Using Coherent EUV Light

100%
Wachulak P., Marconi M., Menoni C., Rocca J., Fiedorowicz H., Bartnik A.
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issue 2
403-407
EN
Extreme ultraviolet (EUV) covers wavelength range from about 5 nm to 50 nm. That is why EUV is especially applicable for imaging and patterning on nanometer scale length. In the paper periodic nanopatterning realized by interference lithography and high resolution holographic nanoimaging performed in a Gabor in-line scheme are presented. In the experiments a compact table top EUV laser was used. Preliminary studies on using a laser plasma EUV source for nanoimaging are presented as well.
9
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Surface Plasmon Resonance Based Sensing of Aqueous Solutions Using Spectral Interferometry

100%
Luňáček J., Hlubina P., Ciprian D., Duliaková M., Luňáčková M.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1
23-27
EN
This paper deals with a polarimetric setup to measure the refractive index change of aqueous solutions. The experimental method is based on the surface plasmon resonance effect in the Kretschmann configuration combined with spectral interferometry. In order to retrieve surface plasmon resonance-induced differential phase change, a windowed Fourier transform was adopted to extract the phases from two spectral interferograms, one corresponding to the reference material (air) and the second to the analyte (NaCl aqueous solution). The shift of phase curve is related to the analyte refractive index change. The refractive index of the NaCl aqueous solutions (0, 2 and 5 percent) was measured by the Abbe refractometer at a wavelength of 589.3 nm and compared with theoretical one, calculated by the Lorentz-Lorenz equation. An excellent agreement between the values was confirmed. The resonance wavelengths as extremes of the surface plasmon resonance-induced differential phase changes retrieved from spectral interference signals were compared with the resonance wavelengths determined from spectral reflectance measurements. A good agreement between the values was confirmed.
10
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Holographic Interferometer as a Correlator of Phase Distortions with Response in the Form of Interference Pattern

88%
Derzhypolska L., Gnatovskiy O., Yezhov P.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
1095-1100
EN
Considered in the work are known properties of holographic interferometer as according to the correlator with output signal in the form of interference fringes. It is known that a space correlation has various ratios of intensity between central correlation peak and background part for objects with different phase microrelief of a surface. Correspondingly an interference pattern must have different space distribution of contrast. A magnitude of contrast depends on changes in distribution of microrelief of investigated object, whereas the interference pattern depends on macroscopic modification of a form of the object. Used here is a scheme of Fourier holography with a random phase modulator in signal beam, reference beam is a point source, and restoring beam is the random phase modulator with random phase shift against initial random phase modulator. Also investigated is a recording of holographic interferogram with these random phase modulators. As the results of original theoretical consideration there was obtained an expression for fringe contrast and intensity of correlation peak. This model was tested by simulating of forming of holographic interferogram and reconstruction of the cross-correlation peak with phase distortions of various statistical distributions. Compared here are theoretical results, simulation results, and results obtained in real experiment.
11
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Surface Plasmon-Polariton Assisted Metal-Dielectric Multilayers as Passband Filters for Ultraviolet Range

88%
Jakšić Z., Maksimović M., Sarajlić M., Tanasković D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
953-958
EN
We designed and fabricated metal-dielectric multilayers intended for passband filters in the ultraviolet range. We determined the dispersion characteristics by the Bloch approach to evanescent wave resonant coupling and calculated the spectral characteristics using the transfer matrix method while taking into account real dispersion and absorptive losses. We considered the influence of nanoscale interface roughness as a means to couple evanescent electromagnetic field to the propagating far field modes. In our structures both propagating and evanescent modes contribute to the overall performance, resulting in an enhanced transmission in the desired range, while retaining a strong suppression of undesired frequencies of more than four orders of magnitude. In our experiments we used radiofrequent sputtering of silver and silica and characterized our multilayers by UV-vis spectroscopy.
12
Content available remote

The Waveguide Structure Based on the Polymer SU8 on a SiO_2/Si Substrate

88%
Gut K., Drewniak S.
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EN
The paper deals with considerations concerning planar waveguide structures, in which the polymer SU8 is used as the waveguide layer. The results of numerical calculations of the distribution of the field concerning structures of various thicknesses have been presented, and photos taken in the course of investigating the surface by means of a microscope of atomic forces. The results of calculations of sensitivity in relation to the refractive index of the cover layer at various thicknesses of the layer have been presented, too.
13
Content available remote

Coherent Beam Splitting by a Thin Grating

88%
Božić M., Dimić D., Davidović M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
479-482
EN
The wide use of beam splitters in quantum interferometry, attosecond metrology, modern quantum information processing, foundations of quantum mechanics, has been based on coherence of beams emerging from a beam splitter. Here we further develop the approach in which a beam splitter is regarded as a transformer of an incident wave field (photon field or matter wave field) into a field which has narrow maxima at the points along and in close vicinity of two or more particular lines. This description was derived by considering a thin grating as a model of a beam splitter for photons, atoms and molecules. It is applied to answer some questions raised in the discussions on the interpretation of wave particle duality.
14
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Planar Optical Waveguides Based on Thin ZnO Layers

75%
Struk P., Pustelny T., Gut K., Gołaszewska K., Kamińska E., Ekielski M., Pasternak I., Łusakowska E., Piotrowska A.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
414-418
EN
The paper quotes the results of investigations concerning planar optical waveguides with a high value of the refractive index, achieved basing on a broad-band gap semiconductor ZnO, deposited on glass or quartz substrates. The investigations were focused on the properties of the waveguides, determining the modal characteristics, the attenuation coefficient and the structure of the surface.
15
Content available remote

Sensitivity of Polarimetric Waveguide Interferometer for Different Wavelengths

75%
Gut K., Zakrzewski A., Pustelny T.
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issue 6
1140-1142
EN
This publication presents experimental measurement methodology which allows to determine the characteristics of sensitivity planar differential interferometer. To confirm data reliability additional measurements were done such as simulations in OptiBPM software by Optiwave. Curves received from two methods: experimental and theoretical, were summed up and compared. Conclusions were made on their basis, for example the influence of used wavelengths or refractive index of single mode waveguide cladding on curves of sensitivity differential interferometer using planar waveguide received from the ion exchange method.
16
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The Influence of the Rotational Speed of the Polymer SU8 on the Thickness of the Waveguide Layer

75%
Gut K., Pustelny T., Nabagło D.
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issue 6
1136-1138
EN
The paper presents results of investigations concerning the measurement of the refractive index and thickness of planar waveguide structures, obtained by the photopolymerization of polymer SU8. Sodium-calcium glass was used as the substrate. As the knowledge of the quoted parameters is from the viewpoint of the structure of various types of optical sensors of crucial importance, the way of their determination has been presented. The paper deals also with the method of constructing planar polymer waveguides, taking into account problems connected with their adhesion to glass substrates.
17
Content available remote

Comparison of the Sensitivity of a Polymer Waveguide in the Classical and Reverse Symmetry System

75%
Gut K., Drewniak S.
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issue 6
1133-1135
EN
In this paper an analysis of two types of planar waveguides (with the conventional type of the layer and the reverse symmetry waveguide) is presented. In both types of the structure the polymer SU8 was used. In respect of its properties, this polymer is suitable as a waveguide layer. The analysis presented in this paper describes those structures working as sensors. We made a comparison of both types of configuration. We made a detailed analysis of the sensitivity of the covering layer when the thickness of the waveguide layer is changing and when the length of the wave activating the structure is changing, too.
18
Content available remote

Measurements of the Attenuation by Means οf the Scattered Light of Planar Waveguide Structure, Basing on the Polymer SU8 on a Substrate οf Sodium-Calcium Glass

75%
Gut K., Nabaglo D.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
307-311
EN
The paper presents the results of investigations concerning the measurement of the attenuation of planar waveguide structures obtained by means of the photopolymerization of the polymer SU8. The applied substrate was sodium-calcium glass. Attenuation is one of the fundamental parameters of optical waveguide, the knowledge of which is of crucial importance in the construction of various kinds of optical sensors. A method of its measurement has been presented, consisting in the recording of the intensity of scattered light making use of CCD camera. The paper deals also with the generation of planar polymer waveguide, taking into account problems connected with the adhesion to glass substrates.
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