Radially polarized terahertz waves from a photoconductive antenna with microstructures

Kan, Koichi; Yang, Jinfeng; Ogata, A.; Sakakihara, Shouichi; Kondoh, Takafumi; Norizawa, Kimihiro; Nozawa, Itta; Toigawa, Tomohiro; Yoshida, Yasuhiko; Kitahara, Hideaki; Takano, Keisuke; Hangyo, Masanori; Kuroda, R.; Toyokawa, Hiroyuki

doi:10.1063/1.4809756

Cited by 29 publications

(14 citation statements)

References 35 publications

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“…Therefore, the radiated pulse is almost overlapped with the sheet profile during the contraction phase and naturally has an attosecond duration. It is interesting to mention that radially polarized half-cycle pulses have also been recently demonstrated from thin photoconductors, where a sequence of annulus microelectrodes is fabricated on a wafer surface to induce radial currents [25]. However, due to the static wafer plane, only pulses of picosecond duration are generated, determined by the lifetime of the radiating currents.…”

Section: -2mentioning

confidence: 99%

Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotronlike radiation

Sheng

Chen

et al. 2014

Phys. Rev. E

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Attosecond bursts of coherent synchrotronlike radiation are found when driving ultrathin relativistic electron disks in a quasi-one-dimensional regime of wakefield acceleration, in which the laser waist is larger than the wake wavelength. The disks of overcritical density shrink radially due to focusing wakefields, thus providing the transverse currents for the emission of an intense, radially polarized, half-cycle pulse of about 100 attoseconds in duration. The electromagnetic pulse first focuses to a peak intensity (7×10(20)W/cm(2)) 10 times larger than the driving pulse and then emerges as a conical beam. Basic dynamics of the radiative process are derived analytically and in agreement with particle-in-cell simulations. By making use of gas targets instead of solids to form the ultrathin disks, this method allows for high repetition rates required for applications.

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Section: -2mentioning

confidence: 99%

Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotronlike radiation

Sheng

Chen

et al. 2014

Phys. Rev. E

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“…In view of various applications, such as plasma heating, imaging [1], security [2], and the biomedical field [3], there has been research on methods of both producing and detecting them. In THz wave research in the laser field, production and detection by means of photoconducting antennas that induce transient photoelectric currents [4][5][6][7][8] and production via the optical rectification effect [9][10][11] in nonlinear optical crystals have been studied.…”

Section: Introductionmentioning

confidence: 99%

Generation of Terahertz Waves Using Ultrashort Electron Beams from a Photocathode Radio‐Frequency Gun Linac

Kan

Yang

Ogata

et al. 2015

Elect Comm in Japan

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SUMMARY Ultrashort (picosecond or femtosecond) electron beams are useful for electromagnetic radiation production in the terahertz (THz) range because the inverse of a 1 ps bunch length corresponds to a frequency of 1 THz. The electron beams were generated by a photocathode radio‐frequency (RF) gun linac. Electron beams with an energy of about 4 MeV at the RF gun exit were accelerated to about 30 MeV in a linac. The accelerated electron beams were compressed by a magnetic bunch compressor, resulting in femtosecond pulse width. THz radiation of the order of 0.1 THz based on coherent Cherenkov radiation (CCR) using hollow dielectric tubes and Smith−Purcell radiation (SPR) using a metallic grating or metasurface are described.

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“…That means the major emission profile is roughly overlapped with the spatial distribution of sheet electrons during the amplification, and thereby naturally has an attosecond duration. It is interesting to notice that radially polarized half-cycle emissions have recently been obtained from thin photoconductors [13], where a sequence of annulus microelectrodes is fabricated to induce the radial currents. However, due to the static wafer plane, only pulses of picosecond duration are generated, determined by the lifetime of the radiating currents.…”

Section: -2mentioning

confidence: 99%

Attosecond electron sheets and attosecond light pulses from relativistic laser wakefields in underdense plasmas

Li¹,

Sheng²,

Chen

et al. 2016

AIP Conference Proceedings

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Radially polarized terahertz waves from a photoconductive antenna with microstructures

Cited by 29 publications

References 35 publications

Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotronlike radiation

Radially polarized, half-cycle, attosecond pulses from laser wakefields through coherent synchrotronlike radiation

Generation of Terahertz Waves Using Ultrashort Electron Beams from a Photocathode Radio‐Frequency Gun Linac

Attosecond electron sheets and attosecond light pulses from relativistic laser wakefields in underdense plasmas

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