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Photonic Band Gaps in One-Dimensionally Ordered Cold Atomic Vapors  [PDF]
Alexander Schilke,Claus Zimmermann,Philippe W. Courteille,William Guerin
Physics , 2011, DOI: 10.1103/PhysRevLett.106.223903
Abstract: We experimentally investigate the Bragg reflection of light at one-dimensionally ordered atomic structures by using cold atoms trapped in a laser standing wave. By a fine tuning of the periodicity, we reach the regime of multiple reflection due to the refractive index contrast between layers, yielding an unprecedented high reflectance efficiency of 80%. This result is explained by the occurrence of a photonic band gap in such systems, in accordance with previous predictions.
Electromagnetically Induced Transparency Spectroscopy  [PDF]
Asaf Eliam,Evgeny A. Shapiro,Moshe Shapiro
Physics , 2012,
Abstract: We propose a method based on the Electromagnetically Induced Transparency (EIT) phenomenon for the detection of molecules which exist as a small minority in the presence of a majority of absorbers. The EIT effect we employ effectively eliminates the absorption of the majority species in the spectral region where it overlaps with the absorption of the minority species. The method can also be used to enhance local-modes transitions which overlap spectrally with a background of other local-modes transitions of the same molecule. The general theory is applied to the case of sparse and congested background spectra within the same molecule and to the recording of the spectra of isotopomers (of Chlorine and Methanol) that are in minority relative to other isotopomers which constitute the majority of molecules present.
On Electromagnetically Induced Transparency in the Degenerate $Λ$-scheme  [PDF]
V. S. Zapasskii
Physics , 2008, DOI: 10.3367/UFNe.0179.200902e.0197
Abstract: Using an experimental work on "stopped light" as an example, we show how a classical phenomenon of linear optics - interference of polarized light - can imitate the effect of electromagnetically induced transparency.
Electromagnetically induced transparency on a single artificial atom  [PDF]
A. A. Abdumalikov, Jr.,O. Astafiev,A. M. Zagoskin,Yu. A. Pashkin,Y. Nakamura,J. -S. Tsai
Physics , 2010, DOI: 10.1103/PhysRevLett.104.193601
Abstract: We present experimental observation of electromagnetically induced transparency (EIT) on a single macroscopic artificial "atom" (superconducting quantum system) coupled to open 1D space of a transmission line. Unlike in a optical media with many atoms, the single atom EIT in 1D space is revealed in suppression of reflection of electromagnetic waves, rather than absorption. The observed almost 100 % modulation of the reflection and transmission of propagating microwaves demonstrates full controllability of individual artificial atoms and a possibility to manipulate the atomic states. The system can be used as a switchable mirror of microwaves and opens a good perspective for its applications in photonic quantum information processing and other fields.
Classical Analog of Electromagnetically Induced Transparency  [PDF]
C. L. Garrido Alzar,M. A. G. Martinez,P. Nussenzveig
Physics , 2001, DOI: 10.1119/1.1412644
Abstract: We present a classical analog for Electromagnetically Induced Transparency (EIT). In a system of just two coupled harmonic oscillators subject to a harmonic driving force we can reproduce the phenomenology observed in EIT. We describe a simple experiment performed with two linearly coupled RLC circuits which can be taught in an undergraduate laboratory class.
Spatially dependent electromagnetically induced transparency  [PDF]
Neal Radwell,Thomas W. Clark,Bruno Piccirillo,Stephen M. Barnett,Sonja Franke-Arnold
Physics , 2014, DOI: 10.1103/PhysRevLett.114.123603
Abstract: Recent years have seen vast progress in the generation and detection of structured light, with potential applications in high capacity optical data storage and continuous variable quantum technologies. Here we measure the transmission of structured light through cold rubidium atoms and observe regions of electromagnetically induced transparency (EIT). We use q-plates to generate a probe beam with azimuthally varying phase and polarisation structure, and its right and left circular polarisation components provide the probe and control of an EIT transition. We observe an azimuthal modulation of the absorption profile that is dictated by the phase and polarisation structure of the probe laser. Conventional EIT systems do not exhibit phase sensitivity. We show, however, that a weak transverse magnetic field closes the EIT transitions, thereby generating phase dependent dark states which in turn lead to phase dependent transparency, in agreement with our measurements.
Double-double electromagnetically induced transparency with amplification  [PDF]
Hessa M. M. Alotaibi,Barry C. Sanders
Physics , 2013, DOI: 10.1103/PhysRevA.89.021802
Abstract: We show that an alkali atom with a tripod electronic structure can yield rich electromagnetically induced transparency phenomena even at room temperature. In particular we introduce double-double electromagnetically induced transparency wherein signal and probe fields each have two transparency windows. Their group velocities can be matched in either the first or second pair of transparency windows. Moreover signal and probe fields can each experience coherent gain in the second transparency windows. We explain using a semi-classical-dressed-picture to connect the tripod electronic structure to a double-\Lambda\ scheme.
Local Modulation of Double Electromagnetically Induced Transparency Spectrum
HOU Bang-Pin,WANG Shun-Jin,YU Wan-Lun,SUN Wei-Li,

中国物理快报 , 2007,
Abstract: The double electromagnetically induced transparency induced by two coupling fields can be realized in a fourlevel tripod-type atom. Such double transparency spectra can be locally modulated by using the weak coherent fields to perturb the coupling transitions. These investigations within this scheme can be independent of Doppler broadening by properly orienting these fieds.
Coupled cavities for enhancing the cross-phase modulation in electromagnetically induced transparency  [PDF]
T. Opatrny,D. -G. Welsch
Physics , 2000, DOI: 10.1103/PhysRevA.64.023805
Abstract: We propose an optical double-cavity resonator whose response to a signal is similar to that of an Electromagnetically Induced Transparency (EIT) medium. A combination of such a device with a four-level EIT medium can serve for achieving large cross-Kerr modulation of a probe field by a signal field. This would offer the possibility of building a quantum logic gate based on photonic qubits. We discuss the technical requirements that are necessary for realizing a probe-photon phase shift of Pi caused by a single-photon signal. The main difficulty is the requirement of an ultra-low reflectivity beamsplitter and to operate a sufficiently dense cool EIT medium in a cavity.
Electromagnetically induced transparency for x rays  [PDF]
Christian Buth,Robin Santra,Linda Young
Physics , 2007, DOI: 10.1103/PhysRevLett.98.253001
Abstract: Electromagnetically induced transparency (EIT) is predicted for x rays in laser-dressed neon gas. The x-ray photoabsorption cross section and polarizability near the Ne K edge are calculated using an ab initio theory suitable for optical strong-field problems. The laser wavelength is tuned close to the transition between 1s^-1 3s and 1s^-1 3p (approximately 800nm). The minimum laser intensity required to observe EIT is of the order of 10^12 W/cm^2. The ab initio results are discussed in terms of an exactly solvable three-level model. This work opens new opportunities for research with ultrafast x-ray sources.
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