Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.45204

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 45, 95–100 (2005)

MODELLING EFFICIENT NL-PML BOUNDARY CONDITIONS FOR THE NONPARAXIAL BEAM PROPAGATION METHOD
R. Petruškevičius
Institute of Physics, Savanorių 231, LT-02300 Vilnius, Lithuania
E-mail: raimisp@ktl.mii.lt

Received 31 January 2005

The nonlinear perfectly matched layer (NL-PML) boundary conditions were successfully applied to the nonparaxial beam propagation method. It is demonstrated that the NL-PML is extremely effective in absorbing the outgoing spatial solitons that impinge the boundary of computation domain for a wide angular spectrum of wave propagation. Using of sufficiently smooth conductivity profiles and termination of NL-PML media by controlled transparent boundary conditions offer further significant improvement in the accuracy of the numerical solutions of the nonparaxial beam propagation method at the grazing angles.

Keywords: nonparaxial beam propagation, boundary conditions, parametric spatial solitons, quasi-phase matching
PACS: 42.25.Bs, 42.65.Tg, 42.65.Yj

EFEKTYVIŲ NETIESINIŲ TOBULAI SUDERINTŲ SLUOKSNIŲ KRAŠTINIŲ SĄLYGŲ MODELIAVIMAS NEGRETAAŠIAM PLUOŠTO SKLIDIMO METODUI
R. Petruškevičius
Fizikos institutas, Vilnius, Lietuva

Netiesinės tobulai suderintų sluoksnių kraštinės sąlygos sėkmingai pritaikytos negretaašiam pluošto sklidimo metodui. Parodyta, kad netiesiniai tobulai suderinti sluoksniai ypač veiksmingai sugeria erdvinius solitonus, krintančius į skaičiavimo srities kraštą, esant plačiam kampiniam bangų sklidimo spektrui. Naudojant pakankamai glotnius laidumo profilius ir netiesinių tobulai suderintų sluoksnių užbaigimą kontroliuojamomis skaidriomis kraštinėmis sąlygomis, galima papildomai žymiai pagerinti skaitmeninių sprendinių tikslumą, nagrinėjant negretaašių pluoštų sklidimą mažais kampais.

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