Global evaluation of closed-loop electron dynamics in quasi-one-dimensional conductors using polarization vortices

Tao, Yu; Shimatake, K.; Toda, Yasunori; Oka, Koichi; Tsubota, Masakatsu; Tanda, Satoshi; Morita, Ryuji

doi:10.1364/oe.17.024198

Cited by 38 publications

(26 citation statements)

References 27 publications

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“…The new light source well-merged with powerful control technique in time or frequency domain such as femtosecond technology enables us to carry out experiments for high-intensity field physics [4], ultrafast nonlinear spectroscopy [5][6][7], terahertz vortex generation based on radiation from coherently-accelerated charged particles along the azimuthal direction [8]. Recently, opticalvortex light sources by the use of femtosecond pulses were reported [9,10].…”

Section: Introductionmentioning

confidence: 99%

Ultrashort optical-vortex pulse generation in few-cycle regime

Yamane¹,

Toda²,

Morita³

2012

Opt. Express

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Abstract:We generated a 2.3-cycle, 5.9-fs, 56-μJ ultrashort opticalvortex pulse (ranging from ∼650 to ∼950 nm) in few-cycle regime, by optical parametric amplification. It was performed even by using passive elements (a pair of prisms and chirped mirrors) for chirp compensation. Spectrally-resolved interferograms and intensity profiles showed that the obtained pulses have no spatial or topological-charge dispersion during the amplification process. To the best of our knowledge, it is the first generation of optical-vortex pulses in few-cycle regime. They can be powerful tools for ultrabroadband and/or ultrafast spectroscopy and experiments of highintensity field physics.

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Section: Introductionmentioning

confidence: 99%

Ultrashort optical-vortex pulse generation in few-cycle regime

Yamane¹,

Toda²,

Morita³

2012

Opt. Express

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“…By changing the mode of interest for conversion, we can obtain an OAM-resolved ( -resolved) spectrum, in which the analyzed beam is decomposed into a series of LG modes with corresponding intensities. The converted fundamental TEM 00 beam is also useful in terms of adopting the technique for various applications, such as telecommunication, optical storage, and laser spectroscopy [3,8,46,47,50,51].…”

Section: Oam Resolved Spectroscopy Based On Mode Conversionmentioning

confidence: 99%

Laser Spectroscopy Using Topological Light Beams

Toda

Morita

2014

Progress in Nanophotonics 3

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Simplifications of systems are important for understanding their universal and/or intrinsic properties. Topology is one of the key concepts of such procedures, which focuses simply on the connectivity of the system to clarify the essential aspects of the geometric structures. To date, this concept has been extended to the field of physics, especially to the condensed matter physics and materials science. For example, topological defects have been observed in various materials, such as liquid crystals, superconductors, and electron gas systems in semiconductors. More recently, photoexcitations to some specific materials (mainly semiconductor nanostructures) have also revealed formation of topological defects. On the other hand, optical field itself includes a topological character, which has been well known as "optical or polarization vortex", "twisted light", and "helical or Laguerre-Gauss light" beams. These topological light beams exhibit spiral (spatial) variations of the phase (polarization) producing phase (polarization) singularities on the wavefront, which can be regarded as topological defects (screw dislocations). Therefore, we have possibilities to evaluate the topological aspects of material system on the interactions with topological light beams. However, the question arises: does it make any sense to apply the topological concept to the laser spectroscopy? The purpose of this chapter is to answer the question by introducing our recent research on this topic. Experimental results will be presented and discussed in terms of topological order of electrons. The chapter begins with the basics of topological light beams together with their important properties for laser spectroscopy (Sect. 3.1). Both the historical background and the overview of applications will also be introduced. In Sects. 3.2 and 3.3, we present several techniques for generating and evaluating the topological light beams, which are useful and needed in the experimental sections. We also discuss their advantages and drawbacks. In Sects. 3.4 and 3.5, we present our experimental results on

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“…Axisymmetrically-polarized modes, such as a radially-polarized (RP) mode and an azimuthally-polarized (AP) mode, have attracted considerable attention for application to laser processing [1][2][3][4][5][6], spectroscopy of a ring shaped material [7], super-resolution microscopy [8], particle acceleration [9], laser trapping [10], and telecommunications [11,12]. They have annular-shaped intensity profile owing to the polarization singularity in the beam center.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear coupling between axisymmetrically-polarized ultrashort optical pulses in a uniaxial crystal

et al. 2014

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Nonlinear propagation of focused axisymmetrically-polarized ultrashort optical pulses along the optic axis in a uniaxial crystal is investigated experimentally and theoretically. The energy transfer between an azimuthally-polarized pulse and a radially-polarized pulse is observed. To analyze the nonlinear propagation, a general paraxial equation with a third-order nonlinearity for axisymmetrically-polarized pulses in a uniaxial crystal is derived and the extended Stokes parameters (ESPs) based on cylindrical coordinates are newly-introduced. The simulation results by using this equation, providing the calculated ESPs, well explain our experimental observations: 1) the energy transfer is attributed to the four-wave-mixing effect, reflecting the overlapping between the axisymmetrically polarized modes, 2) the variations of the polarization defined from the ESPs are clarified to be affected by the self-and the cross-phase modulations, which make the effective propagation length long or short.

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Global evaluation of closed-loop electron dynamics in quasi-one-dimensional conductors using polarization vortices

Cited by 38 publications

References 27 publications

Ultrashort optical-vortex pulse generation in few-cycle regime

Ultrashort optical-vortex pulse generation in few-cycle regime

Laser Spectroscopy Using Topological Light Beams

Nonlinear coupling between axisymmetrically-polarized ultrashort optical pulses in a uniaxial crystal

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