| Title |
Mažų matmenų objektų elektrodinaminių savybių tyrimas baigtinių skirtumų laiko skalėje metodu / |
| Translation of Title |
Investigation of electrodynamic properties of small scale objects using finite-difference time-domain method. |
| Authors |
Šlekas, Gediminas |
| Full Text |
|
| Pages |
124 |
| Keywords [eng] |
finite-difference time-domain ; two-dimmensional electron gas ; planar diode ; sensitivity optimization ; split-ring resonators |
| Abstract [eng] |
Modelling of electrodynamic properties of small scale objects is very important for practical applications since experimental investigation of various configurations consumes time and resources. However, modelling of small objects requires large amount of computational resources. The numerical problem can be reduced using special calculation techniques or the calculations speeded up by transferring them into multiprocessor systems. In this dissertation the equations for modelling of the two-dimensional conductive layers are derived. It is shown that the calculations can be quite simple and efficiently transferred to a computer cluster or a computer graphics card. Using described methodologies two types of structures – planar diode and split ring resonators – were investigated. Planar diode acts as a sensitive detector of electromagnetic waves over a wide frequency range. The operation of the diode in various dimensions of the waveguides was investigated. A condition that should be satisfied keeping the sensitivity of the planar diode unchanged when moving it to a different frequency band waveguides was established. Planar split ring resonator arrays can be used in a devices operating in terahertz frequency range. The investigation of simple symmetric and asymmetric resonators led to a better understanding of resonant properties of split ring resonator systems. The results obtained from simulations were used to create varactor controlled active metamaterial model in terahertz region. It could be used for modulation of monochromatic terahertz signal. Investigation of the influence of Fabry-Perot resonances appearing in dielectric substrate on modulation efficiency was performed. . |
| Dissertation Institution |
Vilniaus universitetas. |
| Type |
Doctoral thesis |
| Language |
Lithuanian |
| Publication date |
2015 |
