Comparison of tunneling times in isotropic and anisotropic media
Abstract
We present a comparative analysis of the tunneling times of electromagnetic (EM) waves propagating in isotropic and anisotropic media. First, suitable expressions for the tunneling times in a layered periodic material, with anisotropic properties originating from its structure, are derived, followed by numerical calculations performed for a new type of anisotropic semiconductor metamaterial. In the first case, we have considered a layered structure which contains two differently doped In0.53Ga0.47As semiconductor layers. The second structure under investigation is made of alternately placed layers of doped In0.53Ga0.47As and undoped Al0.48Ga0.52As. The investigation of the dwell time as a function of incident wave frequency has revealed the existence of two peaks, one of which may be interpreted as a consequence of anisotropy, while the other one corresponds to the peak related to the absorption and the group delay. Both of these two peaks are affected by variations of layers doping de...nsities. Furthermore, at increased incident angles of incoming EM waves, the dwell time peak occurs at the upper boundary of the frequency interval, for which the structure exhibits negative refractive index.
Source:
Applied Physics. A: Materials Science and Processing, 2012, 109, 4, 997-1006Funding / projects:
- Photonics of micro and nano structured materials (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45010)
DOI: 10.1007/s00339-012-7393-5
ISSN: 0947-8396
WoS: 000311512700039
Scopus: 2-s2.0-84870250515
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Institution/Community
VinčaTY - JOUR AU - Radovanović, Jelena V. AU - Ilic, Igor AU - Beličev, Petra AU - Milanović, Vitomir B. AU - Hadžievski, Ljupčo PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/5172 AB - We present a comparative analysis of the tunneling times of electromagnetic (EM) waves propagating in isotropic and anisotropic media. First, suitable expressions for the tunneling times in a layered periodic material, with anisotropic properties originating from its structure, are derived, followed by numerical calculations performed for a new type of anisotropic semiconductor metamaterial. In the first case, we have considered a layered structure which contains two differently doped In0.53Ga0.47As semiconductor layers. The second structure under investigation is made of alternately placed layers of doped In0.53Ga0.47As and undoped Al0.48Ga0.52As. The investigation of the dwell time as a function of incident wave frequency has revealed the existence of two peaks, one of which may be interpreted as a consequence of anisotropy, while the other one corresponds to the peak related to the absorption and the group delay. Both of these two peaks are affected by variations of layers doping densities. Furthermore, at increased incident angles of incoming EM waves, the dwell time peak occurs at the upper boundary of the frequency interval, for which the structure exhibits negative refractive index. T2 - Applied Physics. A: Materials Science and Processing T1 - Comparison of tunneling times in isotropic and anisotropic media VL - 109 IS - 4 SP - 997 EP - 1006 DO - 10.1007/s00339-012-7393-5 ER -
@article{ author = "Radovanović, Jelena V. and Ilic, Igor and Beličev, Petra and Milanović, Vitomir B. and Hadžievski, Ljupčo", year = "2012", abstract = "We present a comparative analysis of the tunneling times of electromagnetic (EM) waves propagating in isotropic and anisotropic media. First, suitable expressions for the tunneling times in a layered periodic material, with anisotropic properties originating from its structure, are derived, followed by numerical calculations performed for a new type of anisotropic semiconductor metamaterial. In the first case, we have considered a layered structure which contains two differently doped In0.53Ga0.47As semiconductor layers. The second structure under investigation is made of alternately placed layers of doped In0.53Ga0.47As and undoped Al0.48Ga0.52As. The investigation of the dwell time as a function of incident wave frequency has revealed the existence of two peaks, one of which may be interpreted as a consequence of anisotropy, while the other one corresponds to the peak related to the absorption and the group delay. Both of these two peaks are affected by variations of layers doping densities. Furthermore, at increased incident angles of incoming EM waves, the dwell time peak occurs at the upper boundary of the frequency interval, for which the structure exhibits negative refractive index.", journal = "Applied Physics. A: Materials Science and Processing", title = "Comparison of tunneling times in isotropic and anisotropic media", volume = "109", number = "4", pages = "997-1006", doi = "10.1007/s00339-012-7393-5" }
Radovanović, J. V., Ilic, I., Beličev, P., Milanović, V. B.,& Hadžievski, L.. (2012). Comparison of tunneling times in isotropic and anisotropic media. in Applied Physics. A: Materials Science and Processing, 109(4), 997-1006. https://doi.org/10.1007/s00339-012-7393-5
Radovanović JV, Ilic I, Beličev P, Milanović VB, Hadžievski L. Comparison of tunneling times in isotropic and anisotropic media. in Applied Physics. A: Materials Science and Processing. 2012;109(4):997-1006. doi:10.1007/s00339-012-7393-5 .
Radovanović, Jelena V., Ilic, Igor, Beličev, Petra, Milanović, Vitomir B., Hadžievski, Ljupčo, "Comparison of tunneling times in isotropic and anisotropic media" in Applied Physics. A: Materials Science and Processing, 109, no. 4 (2012):997-1006, https://doi.org/10.1007/s00339-012-7393-5 . .