Radiation of a resonant medium excited by few-cycle optical pulses at superluminal velocity

Obtaining unipolar half-cycle optical pulses of femto- and attosecond duration with a large electrical area is an urgent but difficult task. The reason for the emerging difficulties lies in the existence of the rule of conservation of the electrical area of the pulse, which does not allow converting a bipolar pulse into a unipolar one. In this work, it is shown that in a resonant medium a low-cycle pulse can be converted into two unipolar pulses separated in time by a distance that is an order of magnitude or more longer than the duration of the initial pulse. This allows in a number of problems to consider such pulses separately as unipolar. The estimation of the electric area value relative to its "atomic scale" is carried out.

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Observation of the transparency of a resonant medium to zero‐degree optical pulses

Applied Physics Letters ◽

10.1063/1.1654257 ◽

1972 ◽

Vol 21 (11) ◽

pp. 559-562 ◽

Cited By ~ 44

Author(s):

H.P. Grieneisen ◽

J. Goldhar ◽

N.A. Kurnit ◽

A. Javan ◽

H.R. Schlossberg

Keyword(s):

Resonant Medium ◽

Optical Pulses ◽

Zero Degree

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Emission of a spatially modulated resonant medium excited with superluminal velocity

Optics and Spectroscopy ◽

10.1134/s0030400x12020038 ◽

2012 ◽

Vol 112 (2) ◽

pp. 243-248 ◽

Cited By ~ 10

Author(s):

M. V. Arkhipov ◽

R. M. Arkhipov ◽

Yu. A. Tolmachev

Keyword(s):

Resonant Medium ◽

Superluminal Velocity

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Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200208 ◽

2020 ◽

Vol 92 (2) ◽

pp. 20502

Author(s):

Behrokh Beiranvand ◽

Alexander S. Sobolev ◽

Anton V. Kudryashov

Keyword(s):

Transmission Line ◽

Terahertz Radiation ◽

Transmission Lines ◽

Software Package ◽

Optical Pulses ◽

Capacitively Coupled ◽

Voltage Difference ◽

Left Handed ◽

Microwave Transmission ◽

Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

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