Conversion of Electrostatic to Electromagnetic Waves by Superluminous Ionization Fronts

Hashimshony, D.; Zigler, A.; Papadopoulos, K.

doi:10.1103/physrevlett.86.2806

Cited by 58 publications

(26 citation statements)

References 11 publications

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“…The indirect photonic transitions shown here rely on the interaction of an optical signal with a moving free-carrier plasma front in a semiconductor [7][8][9][10], which leads to a moving refractive index front via the carrier-plasma dispersion effect [11]. In this case, the front velocity may exceed the speed of light in vacuum, since no material is actually moving.…”

mentioning

confidence: 99%

Optically Induced Indirect Photonic Transitions in a Slow Light Photonic Crystal Waveguide

et al. 2014

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We demonstrate indirect photonic transitions in a silicon slow light photonic crystal waveguide. The transitions are driven by an optically generated refractive index front that moves along the waveguide and interacts with a signal pulse copropagating in the structure. We experimentally confirm a theoretical model which indicates that the ratio of the frequency and wave vector shifts associated with the indirect photonic transition is identical to the propagation velocity of the refractive index front. The physical origin of the transitions achieved here is fundamentally different than in previously proposed refractive index modulation concepts with fixed temporal and spatial modulation frequencies; as here, the interaction with the refractive index front results in a Doppler-like signal frequency and wave vector shift. Consequently, the bandwidth over which perfect mode frequency and wave vector matching is achieved is not intrinsically limited by the shape of the photonic bands, and tuning of the indirect photonic transitions is possible without any need for geometrical modifications of the structure. Our device is genuinely nonreciprocal, as it provides different frequency shifts for co-and counterpropagating signal and index fronts.

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mentioning

confidence: 99%

Optically Induced Indirect Photonic Transitions in a Slow Light Photonic Crystal Waveguide

et al. 2014

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“…In order to develop high-power and efficient THz sources, several schemes have been proposed, out of which current schemes rely on nonlinear interaction of an intense short pulse laser with a semiconductor/dielectric [5][6][7][8] or on synchrotron/ transition radiation 9,10 from bunched electron beams. However, due to damage limit and conversion efficiency it is difficult to obtain powerful THz emission from the THz emitters such as electro-optic crystals, semiconductors, synchrotron, etc.…”

Section: Investigations On Terahertz Radiation Generated By Two Supermentioning

confidence: 99%

Investigations on terahertz radiation generated by two superposed femtosecond laser pulses

Malik

Kawata

2010

Journal of Applied Physics

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The generation of terahertz (THz) radiation based on tunnel ionization of a gas jet is analytically investigated when two superposed short pulse lasers with finite initial phase difference are focused on to it after passing through an axicon. The phase difference between these two lasers plays an important role for the optimization of rate of ionization, evolution of plasma density, and subsequently the residual current due to dipole oscillations. The directionality of the emitted THz radiation can be controlled by tuning initial phase difference between the two laser pulses. Since a nonuniform plasma is produced during the tunnel ionization, the effect of radial variation in the electron density in the plasma channel is studied on the frequency of the emitted THz radiation and on its power. Higher power THz radiation is obtained for the higher fields of the lasers. With optimum initial phase of the laser envelope and the channel width, the mechanism seems to be much more efficient than some of the other mechanisms.

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“…³ÕÂÕËÚÇÔÍÑÇ àÎÇÍÕÓËÚÇÔÍÑÇ ÒÑÎÇ Ä ÓÇÊÖÎßÕÂÕÇ ÄÊÂËÏÑAEÇÌÔÕÄËâ Ô ËÑÐËÊÂÙËÑÐÐÑÌ ÄÑÎÐÑÌ ÒÓÇÑÃÓÂÊÖÇÕÔâ Ä àÎÇÍÕÓÑÏÂÅÐËÕÐÖá ÄÑÎÐÖ [23]. £ ÖÔÎÑÄËâØ àÍÔÒÇÓËÏÇÐÕÑÄ [24,25] ÚÂÔÕÑÕÂ ÅÇÐÇÓËÓÖÇÏÑÌ ÄÑÎÐÞ ÎÇÉËÕ Ä ÕÇÓÂÅÇÓÙÇÄÑÏ AEËÂÒÂÊÑÐÇ (1´¤Ù ÔÑÑÕÄÇÕ-ÔÕÄÖÇÕ ÒÇÓËÑAEÖ 10 À12 Ô). ±ÑÄÞÛÇÐËÇ ÚÂÔÕÑÕÞ ËÊÎÖÚÇÐËâ, ÑÕÓÂÉÈÐÐÑÅÑ ÑÕ ×ÓÑÐÕÂ ËÑÐËÊÂÙËË, ×ÑÓÏËÓÖáÜÇÅÑÔâ ÒÓË ÐÂÍÎÑÐÐÑÏ ÒÂAEÇÐËË ËÑÐËÊÖáÜÇÅÑ ËÊÎÖÚÇÐËâ ÐÂ ÒÑ-ÄÇÓØÐÑÔÕß ÏËÛÇÐË, ÐÂÃÎáAEÂÎÑÔß Ä [26].…”

Section: £äçAeçðëçunclassified

Relativistic mirrors in plasmas — novel results and perspectives

Bulanov¹,

Esirkepov²,

Kando³

et al. 2013

Usp. Fiz. Nauk

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Conversion of Electrostatic to Electromagnetic Waves by Superluminous Ionization Fronts

Cited by 58 publications

References 11 publications

Optically Induced Indirect Photonic Transitions in a Slow Light Photonic Crystal Waveguide

Optically Induced Indirect Photonic Transitions in a Slow Light Photonic Crystal Waveguide

Investigations on terahertz radiation generated by two superposed femtosecond laser pulses

Relativistic mirrors in plasmas — novel results and perspectives

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