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1

Recent advances in PBG structures

Vorgul I.Yu., Marciniak M.

Journal of Telecommunications and Information Technology

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2000

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nr 1-2

71-76

EN

We propose a review of word science achievements in the extremely extended for the recent few years field of photonic band gap structures The review concerns both theoretical and experimental investigations on PBG structures toward fabrication of the most optimal ones for different applications. The attention is given to the obtained results as well as to the used and developed methods.

2

Optical pulse splitting under temporal variations of reflecting medium

Vorgul I.Yu., Marciniak M.

Journal of Telecommunications and Information Technology

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2000

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nr 1-2

66-70

EN

A possibility of light pulse transformation by transient reflecting medium is investigated theoretically. After solving 1D problem of such a reflection one estimates such a transformation in a plane optical waveguide with time-dependent conductivity of one of the reflected media. Three types of the conductivity time-dependences are considered: harmonic, Bessel-like and splash-like ones. Obtained results show a possibility of pulse splitting under an influence of time-harmonic conductivity and pulse collapse vy the other considered nonstationarities.

3

New method of numerical modelling of optical field transformation by inhomogeneous semiconductor layer with time-varying parameters

Vorgul I.Yu., Marciniak M.

Journal of Telecommunications and Information Technology

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2000

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nr 1-2

83-84

EN

A time-domain model of a semiconductor layer with time-dependent inhomogeneous permittivity or conductivity is investigated by solving direct and inverse problems using a novel method, revealing a possibility of wavelength shifting and other desirable optical field transformation, as well as a remote diagnostics of fast time-varying inhomogeneous structures.

4

Dielectric photonic quasi-crystals with doubled quasi-periodicity

Vorgul I.Yu., Marciniak M.

Journal of Telecommunications and Information Technology

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2000

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nr 1-2

77-79

EN

Optical range electromagnetic field interaction with inhomogeneous finite dielectric media is investigated. New method for analysis of this interaction in 1D case based on integral equations for fields in transient media is proposed. Some special cases of quasi-periodical structures with doubled quasi-periodicity are investigated numerically. A possibility to obtain good filtering properties in such structures for small number of quasi-periods is shown.

5

Electromagnetic pulse scattering on half-space with continuously time-varying conductivity

Vorgul I.Yu., Marciniak M.

Prace Instytutu Łączności

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1998

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nr 110

29-42

EN

Theoretical investigation of electromagnetic pulse interaction with transient conductive half-space is carried out by solving Volterra integral equation for the field. General analytical solutions outside the conductive region are obtained for a continuous temporal variation of the conductivity with assumption of the half-space homogeneity and also for a propagating conductivity change. Some special cases of the conductivity time-dependencies are analysed numerically. Particularly, physical features of rectangular pulse scattering for the case of time-harmonic and time-splashing conductivity were investigated.

PL

Przeanalizowano teoretycznie, przez rozwiązanie równań Volterry, oddziaływanie impulsu elektromagnetycznego na półprzestrzeń wypełnioną ośrodkiem przewodzącym o przewodnictwie zmieniającym się w czasie w sposób ciągły. Otrzymano ogólne rozwiązania w postaci analitycznej na zewnątrz obszaru przewodzącego przy założeniu jednorodnego rozkładu przewodnictwa oraz propagujących się zmian przewodnictwa. Przeanalizowano numerycznie szczególne przypadki zmian czasowych przewodnictwa. Określono właściwości fizyczne impulsu prostokątnego rozproszonego na granicy ośrodka o zmianach przewodnictwa opisanych funkcją harmoniczną czasu oraz w postaci pojedynczego impulsu.