Intrinsic formation of electromagnetic divergence and rotation by parabolic focusing

Shibata, Kazunori; Takai, Mayuko; Uemoto, Mitsuharu; Watanabe, Shinichi

doi:10.1103/physreva.92.053806

Cited by 12 publications

(24 citation statements)

References 21 publications

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“…To answer this question, we constructed a terahertz E-field vector imaging system using a CCD camera [62] and investigated the spatial E-field vector distribution at the focal plane. We observed an unusual E-field vector distribution and successfully explained the experimental results by a rigorous calculation as outlined below [69,70]. Figure 4 shows the experimental setup of the terahertz E-field vector imaging system [62].…”

Section: Visualization Of Spatio-temporal Variation Of the E-field Vesupporting

confidence: 74%

Terahertz Polarization Imaging and Its Applications

Watanabe

2018

Photonics

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This review focuses on several recent research activities regarding precise and fast polarization-sensitive terahertz time-domain spectroscopy systems for imaging purposes, and explains three interesting application examples. Owing to modulation techniques that have recently been developed for the evaluation of the instantaneous terahertz electric-field (E-field) vector, fast and precise terahertz polarization imaging becomes feasible. This terahertz technology enables high-resolution surface topography, precise understanding of the spatial E-field vector distribution of the focused terahertz pulse, and examination of strain-induced birefringence in polymeric materials. These examples constitute a new application area of terahertz photonics with emphasis on both fundamental optics and industrial applications.

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Section: Visualization Of Spatio-temporal Variation Of the E-field Vesupporting

confidence: 74%

Terahertz Polarization Imaging and Its Applications

Watanabe

2018

Photonics

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“…In Ref. [28] the authors also develop a simple and approximate model; although not directly applicable to their experimental results, due to its validity strictly holding only for high f numbers, this model predicts the observed loss of the original polarization. An approximate theoretical description of the electric field in the focal region has been also recently proposed by the same authors [30] .…”

Section: Introductionmentioning

confidence: 99%

“…[26,27] both account for a time dependence of the focused ultrashort pulse at an envelope level. Recently, a group working in the field of terahertz radiation reported on an experiment in which the electric and magnetic fields of a THz beam focused with a 90 • OAP mirror were characterized with sub-cycle time resolution [28,29] . In particular, the authors observed a loss of the original polarization structure and the formation of what they call electromagnetic divergence and rotation at the time of the optical cycle at which the fields are supposed to vanish.…”

Section: Introductionmentioning

confidence: 99%

Intra-cycle depolarization of ultraintense laser pulses focused by off-axis parabolic mirrors

Labate

Vantaggiato

Gizzi

2018

High Pow Laser Sci Eng

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A study of the structure of the electric and magnetic fields of ultraintense laser pulses focused by an off-axis parabolic mirror is reported. At first, a theoretical model is laid out, whose final equations integration allows the space and time structure of the fields to be retrieved. The model is then employed to investigate the field patterns at different times within the optical cycle, for off-axis parabola parameters normally employed in the context of ultraintense laser-plasma interaction experiments. The results show that nontrivial, complex electromagnetic field patterns are observed at the time at which the electric and magnetic fields are supposed to vanish. The importance of this effect is then studied for different laser polarizations, f numbers and off-axis angles.

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“…Figure 3 contains more quantitative results and, hence, we can consider the experimental feasibility of the proposed method. For example, in our previous paper, 27) Fig. 3(a), |E Z |=|E Y | = 0.01 corresponds to Δ=λ = 2.8 × 10 −2 .…”

mentioning

confidence: 99%

“…Previously, we reported [27][28][29] that a transient rotational electric field distribution appears around the focus when a linearly polarized parallel light is focused by an off-axis parabolic mirror (PM). The rotational distribution in this case exhibits an interesting feature, i.e., the amplitude at each point varies linearly on the subwavelength scale.…”

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confidence: 99%

One-dimensional subwavelength position determination exploiting off-axis parabolic mirror

Shibata

Uemoto

2017

Appl. Phys. Express

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We demonstrate a subwavelength position determination method for the terahertz region. Previously, we reported that an off-axis parabolic mirror generates a peculiar transient rotational distribution around the focus on the subwavelength scale. In the method proposed herein, the position is determined by measuring the electric field scattered by a sample placed at this rotational distribution. We perform a realistic numerical calculation and show that this method is feasible for a sample on the wavelength scale and can distinguish a displacement of the order of 0.01 wavelengths. This method can be easily implemented for micro and nanoscale measurement and processing in the terahertz region.

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Intrinsic formation of electromagnetic divergence and rotation by parabolic focusing

Cited by 12 publications

References 21 publications

Terahertz Polarization Imaging and Its Applications

Terahertz Polarization Imaging and Its Applications

Intra-cycle depolarization of ultraintense laser pulses focused by off-axis parabolic mirrors

One-dimensional subwavelength position determination exploiting off-axis parabolic mirror

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