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Parametric generation of high frequency coherent light in negative index materials and materials with strong anomalous dispersion

100%
Svidzinsky A. A., Zhang X., Wang L., Wang J.
Coherent Phenomena
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2014
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vol. 2
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issue 1
EN
We demonstrate the possibility of generation of coherent radiation with tunable frequencies higher than the frequency of the driving field vd in a nonlinear medium utilizing the difference combination resonance that occurs when vd matches the difference of the frequencies of the two generated fields ω1 and ω2. We find that such a resonance can appear in materials which have opposite signs of refractive index at ω1 and ω2. It can also occur in positive refractive index materials with strong anomalous dispersion if at one of the generated frequencies the group and phase velocities are opposite to each other. We show that the light amplification mechanism is equivalent to a combination resonance in a system of two coupled parametric oscillators with the opposite sign of masses. Such a mechanism holds promise for a new kind of light source that emits coherent radiation of tunable wavelengths by an optical parametric amplification process with the frequency higher than vd.
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Increasing Photovoltaic Power by Noise Induced Coherence Between Intermediate Band States

100%
Dorfman K. E., Svidzinsky A. A., Scully M. O.
Coherent Phenomena
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2012
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vol. 1
42-49
EN
It has been shown that efficiency of a photovoltaic cell can be enhanced in the presence of intermediate levels in a semiconductor band gap. However the practical realization of this concept is difficult due to low absorption by the intermediate levels. We show that it is possible to significantly increase photon absorption and generate more power utilizing noise induced quantum coherence between intermediate electronic states which is created due to interference among the absorption pathways. We discuss possible experimental demonstration of this effect using confined electronic-hole states in self assembled quantum dots.
3
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Enhancing photocell power by noise-induced coherence

100%
Svidzinsky A. A., Dorfman K. E., Scully M. O.
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EN
We show that coherence induced by Fano interference can enhance the power produced by photovoltaic devices, e.g. photodetectors and solar cells, as compared to the same system with no coherence. No additional external energy source is necessary to create such induced coherence. In the present model, coherence generated by photocurrent increases (for optically thin cells) the flow of electrons through the load, which reduces radiative recombination and enhances cell power. We discuss two schemes in which coherence is generated between upper or lower energy levels. We also study the influence of decoherence, τa, on cell power and show that one can design a device with Fano enhancement even at relatively large decoherence rates. Finally we investigate the effect of ambient temperature Ta on the cell power in a scheme with no interference and show that for certain parameters power can be increased by increasing Ta.
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