scholarly journals An extremely large group index via electromagnetically induced transparency in metamaterials

2014 ◽  
Vol 9 ◽  
Author(s):  
A. Sayahian Jahromi ◽  
M. Askari
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Group Index ◽  
Large Group ◽  
Induced Transparency

scholarly journals Electromagnetically Induced Transparency in an All-Dielectric Metamaterial-Waveguide With Large Group Index

2017 ◽  
Vol 9 (5) ◽  
pp. 1-8 ◽  
Author(s):  
Chuanshuai Sui ◽  
Bingxin Han ◽  
Tingting Lang ◽  
Xiangjun Li ◽  
Xufeng Jing ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Group Index ◽  
Large Group ◽  
Metamaterial Waveguide ◽  
Induced Transparency

scholarly journals Electromagnetically Induced Transparency in Media with Rydberg Excitons 1: Slow Light

Entropy ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 177 ◽  
Author(s):  
David Ziemkiewicz
Keyword(s):  
Light Pulse ◽  
Slow Light ◽  
Electromagnetically Induced Transparency ◽  
Proper Choice ◽  
Group Index ◽  
Large Group ◽  
Slowing Down ◽  
Induced Transparency ◽  
Good Agreement

In this paper, we show that Electromagnetically Induced Transparency (EIT) can be realized in mediums with Rydberg excitons. With realistic, reliable parameters which show good agreement with optical and electro-optical experiments, as well as the proper choice of Rydberg exciton states in the Cu2O crystal, we indicate how the EIT can be performed. The calculations show that, due to a large group index, one can expect the slowing down of a light pulse by a factor of about 10 4 in this medium.

Manipulation of pulse propagation in a four-level quantum system via an elliptically polarized light in the presence of external magnetic field

2015 ◽  
Vol 29 (30) ◽  
pp. 1550185 ◽  
Author(s):  
R. Karimi ◽  
S. H. Asadpour ◽  
S. Batebi ◽  
H. Rahimpour Soleimani
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Pulse Propagation ◽  
Electromagnetically Induced Transparency ◽  
Polarized Light ◽  
Group Index ◽  
Probe Field ◽  
Coherent Field ◽  
Fast Light ◽  
Induced Transparency

The influence of external magnetic field and relative phase between two electric field components of the probe field on absorption–dispersion and group index of a four-level atomic system with two degenerate sublevels are investigated. The results show that, the behaviors of weak probe light can be controlled by an external magnetic field. It is shown that in the presence of the external magnetic field the additional electromagnetically induced transparency (EIT) window can be obtained. Our result also reveal that the switching from slow to fast light or vice versa can be manipulated by changing the phase difference between the two circularly polarized components of a single coherent field.

Wideband and multiband electromagnetically induced transparency in graphene metamaterials

2019 ◽  
Vol 33 (09) ◽  
pp. 1950068 ◽  
Author(s):  
Renxia Ning ◽  
Xiang Gao ◽  
Zhenhai Chen
Keyword(s):  
Communication Technology ◽  
Slow Light ◽  
Electromagnetically Induced Transparency ◽  
Microwave Frequency ◽  
Ring Resonators ◽  
Group Index ◽  
Frequency Range ◽  
Split Ring ◽  
Structure Lead ◽  
Induced Transparency

A multiband tunable electromagnetic induced transparency (EIT) effect in metamaterial at microwave frequency range is investigated. The sandwich structure contains silicon dioxide and gold layers. The metamaterial structure has multiband EIT phenomenon due to coupling with U-Shaped split-ring resonators (SRRs) and cut wire (CW). Two different modes can be obtained in CW and a single band EIT effects in SRRs. Results show that the different resonances in the structure lead to multiband EIT. By adding the finding of the graphene layer on top of the structures, EIT window can be changed obviously. It is shown that the graphene can adjust EIT phenomenon. The group index is calculated to exhibit the slow light effect. The demonstrated phenomenon can provide valuable variety of important applications, including microwave communication technology, microwave devices, slow light and switch devices.

scholarly journals Large group delay in a microwave metamaterial analog of electromagnetically induced transparency

2010 ◽  
Vol 97 (24) ◽  
pp. 241904 ◽  
Author(s):  
Lei Zhang ◽  
Philippe Tassin ◽  
Thomas Koschny ◽  
Cihan Kurter ◽  
Steven M. Anlage ◽  
...  
Keyword(s):  
Group Delay ◽  
Electromagnetically Induced Transparency ◽  
Large Group ◽  
Induced Transparency

scholarly journals Giant cross-Kerr nonlinearity in a four-level Y-type atomic system

2021 ◽  
Vol 13 (1) ◽  
pp. 13
Author(s):  
Nguyen Van Phu ◽  
Nguyen Huy Bang ◽  
Doai Van Le
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Light Propagation ◽  
Slow Light ◽  
Atomic System ◽  
Electromagnetically Induced Transparency ◽  
Kerr Nonlinearity ◽  
Group Index ◽  
Buffer Gas ◽  
Induced Transparency

The analytical expression for the group index in a degenerated three-level lambda-type atomic system is derived as a function of the parameters of laser fields and external magnetic field. The influence of the external magnetic field on the group index is investigated. It is shown that by changing the magnitude or sign of the external magnetic field, the transparency window with normal dispersion switches to enhanced absorption with anomalous dispersion at the line center and hence the light propagation can be converted between subluminal and superluminal modes. Full Text: PDF ReferencesR. W. Boyd, "Slow and fast light: fundamentals and applications", J. Mod. Opt. 56 (2009) 1908-1915 CrossRef K.J. Boller, A. Imamoglu, S.E. Harris, "Observation of electromagnetically induced transparency", Phys. Rev. Lett. 66 (1991) 2593. CrossRef A. Lezama, S. Barreiro, and A. M. Akulshin, "Electromagnetically induced absorption", Phys. Rev. A 59 (1999) 4732-4735. CrossRef L. V. Hau, S. E. Harris, Z. Dutton, C. H. Bejroozi, "Light speed reduction to 17 metres per second in an ultracold atomic gas", Nature 397, 594 (1999) CrossRef L. J. Wang, A. Kuzmich, and A. Dogariu, "Gain-assisted superluminal light propagation", Nature 406 (6793), 277-279 (2000) CrossRef A. V. Turukhin, V. S. Sudarshanam, M. S. Shahriar, J. A. Musser, B. S. Ham, P. R. Hammer, "Observation of Ultraslow and Stored Light Pulses in a Solid", Phys. Rev. Lett. 88, 023602 (2002). CrossRef K. Bencheikh, E. Baldit, S. Briaudeau, P. Monnier, J. A. Levenson, and G. Mélin, "Slow light propagation in a ring erbium-doped fiber", Opt. Express 18 (25), 25642-25648 (2010). CrossRef E. E. Mikhailov, V. A. Sautenkov, I. Novikova, G. R. Welch, "Large negative and positive delay of optical pulses in coherently prepared dense Rb vapor with buffer gas", Phys. Rev. A 69, 063808 (2004). CrossRef E. E. Mikhailov, V. A. Sautenkov, Y. V. Rostovtsev, G.R. Welch, "Absorption resonance and large negative delay in rubidium vapor with a buffer gas", J. Opt. Soc. Am. B 21, 425 (2004). CrossRef A. M Akulshin and R. J McLean, "Fast light in atomic media", J. Opt. 12 (2010) 104001. CrossRef Vineet Bharti, Vasant Natarajan, "Sub- and super-luminal light propagation using a Rydberg state", Opt. Comm. 392 (2017) 180-184. CrossRef N.T. Anh, L.V. Doai, D.H. Son, and N.H. Bang, "Manipulating multi-frequency light in a five-level cascade EIT medium under Doppler broadening", Optik 171 (2018) 721-727. CrossRef N.T. Anh, L.V. Doai, and N.H. Bang, "Manipulating multi-frequency light in a five-level cascade-type atomic medium associated with giant self-Kerr nonlinearity", J. Opt. Soc. Am. B 35 (2018) 1233. CrossRef N.H. Bang, L.N.M. Anh, N.T. Dung and L.V. Doai, "Comparative Study of Light Manipulation in Three-Level Systems Via Spontaneously Generated Coherence and Relative Phase of Laser Fields*", Commun. Theor. Phys. 71 (2019) 947-954. CrossRef L.V. Doai, "The effect of giant Kerr nonlinearity on group velocity in a six-level inverted-Y atomic system", Physica Scripta 95 (2020) 035104 (7pp). CrossRef P. Kaur and A. Wasan, "Effect of magnetic field on the optical properties of an inhomogeneously broadened multilevel Λ-system in Rb vapor", Eur. Phys. J. D 71 (2017) 78. CrossRef H. Cheng, H. -M. Wang, S. -S. Zhang, P. -P. Xin, J. Luo and H. -P. Liu, "Electromagnetically induced transparency of 87Rb in a buffer gas cell with magnetic field", J. Phys. B: At. Mol. Opt. Phys. 50 (2017) 095401. CrossRef C. Mishra, A. Chakraborty, A. Srivastava, S. K. Tiwari, S. P. Ram, V. B. Tiwari and S. R. Mishr, "lectromagnetically induced transparency in Λ-systems of 87Rb atom in magnetic field", J. Mod. Opt. 65 (2018) 2269-2277. CrossRef S. H. Asadpour, H. R. Hamedi and H. R. Soleimani, "Slow light propagation and bistable switching in a graphene under an external magnetic field", Laser Phys. Lett. 12 (2015) 045202. CrossRef R. Karimi, S. H. Asadpour, S. Batebi and h. R. Soleimani, "Manipulation of pulse propagation in a four-level quantum system via an elliptically polarized light in the presence of external magnetic field", Mod. Phys. Lett. B 29 (2015) 1550185. CrossRef

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