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A suggestion of utilizing bimodal layers of the polymer SU8 for the purpose of monitoring the changes in the refractive index

100%

Gut K.

tom Vol. 42, nr 2

407-416

The paper presents the results of investigations concerning the measurements of the refractive index and the thickness of planar waveguide structures, obtained by photopolymerization of the polymer SU8. In the paper, the mode sensitivity has been calculated as a function of the thickness in a bimodal structure. The differential interference has been analyzed, concerning the modes of the same types TE0-TE1 and TM0-TM1. The thickness of the layer has been determined when the interferometer is most sensitive to the changes in the refractive index.

Differential interference in a polymer waveguide

100%

Gut K.

2011

tom Vol. 59, nr 4

395-399

The paper presents the results of investigations concerning the measurement of the refractive index and the thickness of planar waveguide structures, obtained by photo polymerization of the polymer SU8. In the paper the mode sensitivity has been calculated as a function of the thickness in a single-mode structure. The thickness of the layer has been determined in the case when the interferometer is most sensitive to changes of the refractive index.

Światłowodowy demodulator fazy : model i wyniki eksperymentalne

63%

Hołdyński Z. , Merta I. , Jaroszewicz L. R. , Świłło R.

tom Vol. 53, nr 11

46-47

W pracy przedstawiono model i wyniki badań interferencyjnego światłowodowego demodulatora fazy w układzie interferometru Younga z dwuelementowym fotodetektorem w płaszczyźnie Fouriera. Oszacowano błąd metody pomiaru fazy i podano warunek jego minimalizacji w powiązaniu z parametrami geometrycznymi demodulatora pokazano związek odległości między fotodetektorami z liniowością światłowodowego demodulatora fazy. Wyniki eksperymentalne pozostają w wysokim stopniu korelacji z przyjętym modelem demodulatora fazy.

In work we present fibre optics phase demodulator modeling and experimental results based on Young interferometrie configuration with bicell photodetector in Fourier focal plane. We experimentally estimated measurements' method errors and explained minimum condition of errors because of their directly connection with demodulator geometric parameters. We explained influence of gap size between photodetectors on linearization condition of phase demodulator. Experimental results are in high correlation with described model of phase demodulator.

Prospects for Solar and Space Weather Research with Polish Part of the LOFAR Telescope

51%

Dąbrowski B. P. , Krankowski A. , Błaszkiewicz L. , Rothkaehl H.

tom Vol. 64, no. 3

825--840

The LOw-Frequency ARray (LOFAR) is a new radio interferometer that consists of an array of stations. Each of them is a phase array of dipole antennas. LOFAR stations are distributed mostly in the Netherlands, but also throughout Europe. In the article we discuss the possibility of using this instrument for solar and space weather studies, as well as ionosphere investigations. We are expecting that in the near future the LOFAR telescope will bring some interesting observations and discoveries in these fields. It will also help to observe solar active events that have a direct influence on the near-Earth space weather.