Dressed-state mixed-parity transitions for realizing negative refractive index

Krowne, Clifford M.; Shen, Jian Qi

doi:10.1103/physreva.79.023818

Cited by 44 publications

(32 citation statements)

References 29 publications

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“…Another area, extremely prominent recently, is the phenomenon of negative refraction (NR) or negative index materials (NIMs), whereby the electromagnetic wave can display a negative phase velocity, 24 a reversed magnetic field circulation pattern and some negative Poynting (power) vector, 25 a negative angle of refraction, 26,27 and simultaneous negative permittivity and permeability which assures NR and NIM. 28 In an earlier study, 29 the energy view was adopted with detailed discussions of Gibbs free energy G versus electric polarization P, derivative of it dG=dP with respect to P versus P, and polarization P versus electric field E. However, neglecting other viewpoints creates some confusion as to whether or not one viewpoint or another could allow a different boundary surface between negative and positive differential capacitance. This is particularly important to address at this point in time because in Ref.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the differential capacitance for ferroelectric materials using either charge-based or energy-based expressions

Krowne

2014

J. Adv. Dielect.

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Differential capacitance is derived based upon energy, charge or current considerations, and determined when it may go negative or positive. These alternative views of differential capacitances are analyzed, and the relationships between them are shown. Because of recent interest in obtaining negative capacitance for reducing the subthreshold voltage swing in field effect type of devices, using ferroelectric materials characterized by permittivity, these concepts are now of paramount interest to the research community. For completeness, differential capacitance is related to the static capacitance, and conditions when the differential capacitance may go negative in relation to the static capacitance are shown.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the differential capacitance for ferroelectric materials using either charge-based or energy-based expressions

Krowne

2014

J. Adv. Dielect.

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“…Obviously, the impact on the research of artificial electromagnetic LHM would be enormous if a three-dimensionally isotropic and homogeneous material of simultaneously negative permittivity and permeability can be realized in optical frequency ranges by using new schemes, e.g., quantum optical approaches. In the literature, there have been some scenarios suggested for realizing the negative refractive indices based on electromagnetically induced transparency (EIT) and photonic resonance in atomic vapors [20][21][22][23][24][25]. However, all these media exhibit quite large absorption to light fields.…”

Section: Introductionmentioning

confidence: 99%

Gain-Assisted Negative Refractive Index in a Quantum Coherent Medium

Shen¹

2013

PIER

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Abstract-A new scheme for overcoming losses with incoherent optical gain in a quantum-coherent left-handed atomic vapor is suggested. In order to obtain low-loss, lossless or active left-handed media (LHM), a pump field, which aims at realizing population inversion of atomic levels, is introduced into a four-level atomic system. Both analytical and numerical results are given to illustrate that such an atomic vapor can exhibit intriguing electric and magnetic responses required for achieving simultaneously negative permittivity and permeability (and hence a gain-assisted quantum-coherent negative refractive index would emerge). The quantum-coherent left-handed atomic vapor presented here could have four fascinating characteristics: i) three-dimensionally isotropic negative refractive index, ii) doublenegative atomic medium at visible and infrared wavelengths, iii) high-gain optical amplification, and iv) tunable negative refractive index based on quantum coherent control. Such a three-dimensionally isotropic gain medium with negative refractive index at visible and infrared frequencies would have a potential application in design of new quantum optical and photonic devices, including superlenses for perfect imaging and subwavelength focusing.

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“…Over the past two decades, the effects of atomic phase coherence have exhibited a number of physically interesting phenomena such as electromagnetically induced transparency (EIT) (Harris, 1997) and the effects that are relevant to EIT, including light amplification without inversion (Cohen & Berman, 1997), spontaneous emission cancellation (Zhu & Scully, 1996), multi-photon population trapping (Champenois et al, 2006), coherent phase control (Zheltikov, 2006;Gandman et al, 2007) as well as photonic resonant lefthanded media (Krowne & Shen, 2009). EIT is such a quantum optical phenomenon that if one resonant laser beam propagates in a medium (e.g., an atomic vapor or a semiconductor-quantum-dot material), the beam will get absorbed; but if two resonant laser beams instead propagate inside the same medium, neither would be absorbed.…”

Section: Introductionmentioning

confidence: 99%