Ultrafast electrical signal generation, propagation and detection

Dykaar, D. R.; Keil, U. D.

doi:10.1007/bf00820147

Cited by 6 publications

(5 citation statements)

References 74 publications

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“…We are aware of the reports where the voltage pulse durations down to several hundreds femtoseconds were achieved by designing special photoswitch circuits and using the semiconducting media characterized by short electron decay times. [52][53][54] As for the decay time, they can be very small in metal-based structures. In the limit of ballistic transport estimates based on Eq.…”

Section: Magnetization Reversal Induced By An Electric Bias Pulsementioning

confidence: 99%

Exchange scattering as the driving force for ultrafast all-optical and bias-controlled reversal in ferrimagnetic metallic structures

Kalashnikova

Козуб

2016

Phys. Rev. B

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Experimentally observed ultrafast all-optical magnetization reversal in ferrimagnetic metals and heterostructures based on antiferromagnetically coupled ferromagnetic d− and f −metallic layers relies on intricate energy and angular momentum flow between electrons, phonons and spins. Here we treat the problem of angular momentum transfer in the course of ultrafast laser-induced dynamics in a ferrimagnetic metallic system using microscopical approach based on the system of rate equations. We show that the magnetization reversal is supported by a coupling of d− and f − subsystems to delocalized s− or p− electrons. The latter can transfer spin between the two subsystems in an incoherent way owing to the (s; p) − (d; f ) exchange scattering. Since the effect of the external excitation in this process is reduced to the transient heating of the mobile electron subsystem, we also discuss possibility to trigger the magnetization reversal by applying a voltage bias pulse to antiferromagnetically coupled metallic ferromagnetic layers embedded in point contact or tunneling structures. We argue that such devices allow controlling reversal with high accuracy. We also suggest to use the anomalous Hall effect to register the reversal, thus playing a role of reading probes.

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Section: Magnetization Reversal Induced By An Electric Bias Pulsementioning

confidence: 99%

Exchange scattering as the driving force for ultrafast all-optical and bias-controlled reversal in ferrimagnetic metallic structures

Kalashnikova

Козуб

2016

Phys. Rev. B

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“…For high frequencies, the skin effect in metal electrodes and the dielectric relaxation in the substrate are the two major factors that prevent the metal strips from guiding electrical pulses. However, carefully designed, monolithically integrated metal waveguides on a GaAs-substrate support non-dispersive transmission of electrical pulses with bandwidths up to 200 GHz [1] and a micro-machined coplanar waveguide on a Si-substrate establishes 300-GHzbandwidth non-dispersive pulse propagation [10]. These suggest that the influence of the losses can be made negligible by properly designing the structure of an NLTL.…”

Section: Discussionmentioning

confidence: 98%

“…The broadband optical-to-electrical conversion of a short optical pulse is one method for generating ultrashort pulses. A low-temperature-grown GaAs photoconductor succeeded in generating a 700 GHz bandwidth electrical pulse [1]. A uni-traveling-carrier photodiode [2] is best used for 1.55 μm lights.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Nonlinear Transmission Lines for Short Pulse Amplification

Narahara

2009

J Infrared Milli Terahz Waves

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Pulse propagation on nonlinear transmission lines (NLTLs), which are transmission lines with regularly spaced Schottky varactors, is investigated for the amplification of short pulses. We recently found that the soliton developed in an NLTL experiences an exponential amplitude growth, when it couples with an existing voltage edge. This paper clarifies how the pulse gain depends on the device parameters, including the line inductance, capacitance, and gradient of voltage edge, and describes the design criteria of an NLTL as a pulse amplifier, together with several results of calculations that examine the potential of the NLTL.

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“…An alternative to obtain large ultrashort electrical pulses is the broadband optical-to-electrical conversion of a short optical pulse, which fully utilizes a low-temperature-grown GaAs photoconductor [1] or a unitraveling-carrier photodiode [2]. Moreover, an electrical nonlinear transmission line (NLTL) [3], defined as a transmission line periodically loaded with Schottky varactors, can be a good platform for all electrical short pulse generation [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization of nonlinear transmission lines for amplification of short pulses

Nakagawa

Narahara

2011

2011 International Conference on Multimedia Technology

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Pulse propagation on nonlinear transmission lines (NLTLs), which are transmission lines with regularly spaced Schottky varactors, is experimentally investigated for the amplification of short pulses. We recently found that the soliton developed in an NLTL experiences an exponential amplitude growth, when it couples with an existing voltage edge. Using a test NLTL, we successfully demonstrate the pulse amplification through time-domain measurements. The voltage edge becomes steeper as it travels further, because the nonlinearity leads to the shock formation. This steep edge contributes to the pulse amplification even for the presence of the large parasitic resistance of inductors.

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Ultrafast electrical signal generation, propagation and detection

Cited by 6 publications

References 74 publications

Exchange scattering as the driving force for ultrafast all-optical and bias-controlled reversal in ferrimagnetic metallic structures

Exchange scattering as the driving force for ultrafast all-optical and bias-controlled reversal in ferrimagnetic metallic structures

Characterization of Nonlinear Transmission Lines for Short Pulse Amplification

Experimental characterization of nonlinear transmission lines for amplification of short pulses

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