Modeling of dwell time and group delay in dispersive and absorptive media
Apstrakt
In this paper, a more general expression that describes the relationship between dwell time and group delay is derived. This expression is valid for all kinds of materials, including negative-index metamaterials (NIMs). An obstacle made of double-negative NIMs (DN-NIMs) and surrounded by a double-positive waveguide was used as a model. In the cases where the obstacle was made of left-handed materials and the surroundings were air, it has been shown that the dwell time and absorption have similar dependences on the incident wave frequency. On the other hand, group delay becomes negative in some cases. Numerical results show that an increase in the length of the obstacle leads to saturation of the dwell time and absorption, which is in accordance with the phenomenon known as the Hartman effect. Similar results were obtained for terahertz range of frequencies and for the dispersive waveguide. In this case, it is shown that there is a certain range of frequencies where group velocity is po...sitive, whereas the phase velocity remains negative, i.e. the peak of the output pulse appears before the peak of the input pulse. Finally, the use of a model that considers an obstacle made of a lossless, non-magnetic metamaterial, with background permittivity equal to 1 and a dispersive waveguide, leads to the appearance of a new delay, called self-interference time.
Izvor:
Physica Scripta, 2009, T135Napomena:
- 15th Central European Workshop on Quantum Optics, May 29-Jun 03, 2008, Belgrade, Serbia
DOI: 10.1088/0031-8949/2009/T135/014040
ISSN: 0031-8949
WoS: 000269768300042
Scopus: 2-s2.0-70350627703
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Ilic, I. AU - Beličev, Petra AU - Milanović, Vitomir B. AU - Radovanović, Jelena V. PY - 2009 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6836 AB - In this paper, a more general expression that describes the relationship between dwell time and group delay is derived. This expression is valid for all kinds of materials, including negative-index metamaterials (NIMs). An obstacle made of double-negative NIMs (DN-NIMs) and surrounded by a double-positive waveguide was used as a model. In the cases where the obstacle was made of left-handed materials and the surroundings were air, it has been shown that the dwell time and absorption have similar dependences on the incident wave frequency. On the other hand, group delay becomes negative in some cases. Numerical results show that an increase in the length of the obstacle leads to saturation of the dwell time and absorption, which is in accordance with the phenomenon known as the Hartman effect. Similar results were obtained for terahertz range of frequencies and for the dispersive waveguide. In this case, it is shown that there is a certain range of frequencies where group velocity is positive, whereas the phase velocity remains negative, i.e. the peak of the output pulse appears before the peak of the input pulse. Finally, the use of a model that considers an obstacle made of a lossless, non-magnetic metamaterial, with background permittivity equal to 1 and a dispersive waveguide, leads to the appearance of a new delay, called self-interference time. T2 - Physica Scripta T1 - Modeling of dwell time and group delay in dispersive and absorptive media VL - T135 DO - 10.1088/0031-8949/2009/T135/014040 ER -
@article{ author = "Ilic, I. and Beličev, Petra and Milanović, Vitomir B. and Radovanović, Jelena V.", year = "2009", abstract = "In this paper, a more general expression that describes the relationship between dwell time and group delay is derived. This expression is valid for all kinds of materials, including negative-index metamaterials (NIMs). An obstacle made of double-negative NIMs (DN-NIMs) and surrounded by a double-positive waveguide was used as a model. In the cases where the obstacle was made of left-handed materials and the surroundings were air, it has been shown that the dwell time and absorption have similar dependences on the incident wave frequency. On the other hand, group delay becomes negative in some cases. Numerical results show that an increase in the length of the obstacle leads to saturation of the dwell time and absorption, which is in accordance with the phenomenon known as the Hartman effect. Similar results were obtained for terahertz range of frequencies and for the dispersive waveguide. In this case, it is shown that there is a certain range of frequencies where group velocity is positive, whereas the phase velocity remains negative, i.e. the peak of the output pulse appears before the peak of the input pulse. Finally, the use of a model that considers an obstacle made of a lossless, non-magnetic metamaterial, with background permittivity equal to 1 and a dispersive waveguide, leads to the appearance of a new delay, called self-interference time.", journal = "Physica Scripta", title = "Modeling of dwell time and group delay in dispersive and absorptive media", volume = "T135", doi = "10.1088/0031-8949/2009/T135/014040" }
Ilic, I., Beličev, P., Milanović, V. B.,& Radovanović, J. V.. (2009). Modeling of dwell time and group delay in dispersive and absorptive media. in Physica Scripta, T135. https://doi.org/10.1088/0031-8949/2009/T135/014040
Ilic I, Beličev P, Milanović VB, Radovanović JV. Modeling of dwell time and group delay in dispersive and absorptive media. in Physica Scripta. 2009;T135. doi:10.1088/0031-8949/2009/T135/014040 .
Ilic, I., Beličev, Petra, Milanović, Vitomir B., Radovanović, Jelena V., "Modeling of dwell time and group delay in dispersive and absorptive media" in Physica Scripta, T135 (2009), https://doi.org/10.1088/0031-8949/2009/T135/014040 . .