Improvement in thermal barriers to intense terahertz generation from photoconductive antennas

Ropagnol, X.; Bouvier, M.; Reid, M.; Ozaki, T.

doi:10.1063/1.4891451

Cited by 21 publications

(14 citation statements)

References 44 publications

(61 reference statements)

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“…However, considering the error bar, we can conclude that all the saturation fluences are in the same range. The saturation fluences of the ZnSe and 6H-SiC LAPCA pumped with 248 nm laser is around 5 times larger than when they are pumped with 400 nm femtosecond laser [46,51]. Using equation (2), we calculate the transient carrier mobility, and find a transient mobility ranging from 52 cm 2 V −1 s −1 , for ZnSe, to 63 cm 2 V −1 s −1 for 6H-SiC.…”

Section: Thz Satmentioning

confidence: 99%

“…Wide-bandgap semiconductor crystals have large dielectric strength, which is advantageous, especially in comparison with smaller bandgap semiconductors (such as GaAs), since high bias fields need to be applied to LAPCAs for the generation of high-field THz pulses. Previously, diamond, ZnO, GaN, ZnSe, 4H-SiC and 6H-SiC crystals were tested as substrates for photoconductive antennas [43][44][45][46]. Despite showing promising results, most of these substrates have not been tested on a very large aperture for the generation of THz pulses with μJ energy level.…”

Section: Introductionmentioning

confidence: 99%

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Intense sub-terahertz radiation from wide-bandgap semiconductor based large-aperture photoconductive antennas pumped by UV lasers

et al. 2019

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The characteristics of terahertz (THz) radiation generated from large-aperture photoconductive antennas (LAPCAs) were investigated. The antennas were fabricated using different wide-bandgap semiconductor crystals (ZnSe, GaN, 6H-SiC, 4H-SiC and β-Ga 2 O 3 ) as the substrate. We used an amplified sub-picosecond KrF excimer laser for illumination of the LAPCAs. THz emission scaling was studied as a function of the bias field and the pump laser energy. It was found that the radiated THz energy scales quadratically as a function of the bias field and sub-linearly as a function of the optical fluence for most of the substrates. Further, we demonstrate that SiC, and especially 4H-SiC LAPCAs offer the best THz generation performances. In order to generate intense THz radiation, we fabricated both 6H-and 4H-SiC LAPCAs with an interdigitated structure. From the field autocorrelation trace, it was found that the spectra lie in the sub-THz regime, extending up to 400 GHz, with a peak frequency at 50 GHz, making the bridge between the microwaves band and the THz band. The maximum generated THz energy was 11 μJ, which is to date the highest THz energy measured from LAPCA sources, with a corresponding peak electric field of 115 kV cm −1 and a corresponding ponderomotive potential of 60 eV. Nonlinear THz experiments were performed using these energetic THz pulses, and open aperture Z-scan experiments in an n-doped InGaAs layer revealed a transmission enhancement of 1.7. It was also shown that in order to have efficient THz generation, the energy contrast of the laser must be kept high.

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Section: Thz Satmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intense sub-terahertz radiation from wide-bandgap semiconductor based large-aperture photoconductive antennas pumped by UV lasers

et al. 2019

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“…These two crystals can overcome the thermal effects well. Compared with ZnSe crystals, 6H-SiC has a 2.3 times higher THz field under optimal conditions [28].…”

Section: Photoconductive Antennamentioning

confidence: 99%

Intense terahertz radiation: generation and application

Zhang

Zhao

2020

Front. Optoelectron.

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Strong terahertz (THz) radiation provides a powerful tool to manipulate and control complex condensed matter systems. This review provides an overview of progress in the generation, detection, and applications of intense THz radiation. The tabletop intense THz sources based on Ti:sapphire laser are reviewed, including photoconductive antennas (PCAs), optical rectification sources, plasma-based THz sources, and some novel techniques for THz generations, such as topological insulators, spintronic materials, and metasurfaces. The coherent THz detection methods are summarized, and their limitations for intense THz detection are analyzed. Applications of intense THz radiation are introduced, including applications in spectroscopy detection, nonlinear effects, and switching of coherent magnons. The review is concluded with a short perspective on the generation and applications of intense THz radiation.

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“…The main features of the radiation generated by large-aperture PCAs are the low-frequency peak in the emission spectrum and the quasi-half-cycle pulse of the emitted radiation [6,7]. Currently, the study of promising substrate materials suitable for different pump lasers is of great interest for high-power large-aperture PCA devices [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Photoconductive Terahertz Generation in Nitrogen-Doped Diamonds

et al. 2021

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The efficiency of the generation of terahertz radiation from nitrogen-doped (∼0.1–100 ppm) diamonds was investigated. The synthetic polycrystalline and monocrystalline diamond substrates were pumped by a 400 nm femtosecond laser and tested for the photoconductive emitter operation. The dependency of the emitted THz power on the intensity of the optical excitation was measured. The nitrogen concentrations of the diamonds involved were measured from the optical absorbance, which was found to crucially depend on the synthesis technique. The observed correlation between the doping level and the level of the performance of diamond-based antennas demonstrates the prospects of doped diamond as a material for highly efficient large-aperture photoconductive antennas.

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Improvement in thermal barriers to intense terahertz generation from photoconductive antennas

Cited by 21 publications

References 44 publications

Intense sub-terahertz radiation from wide-bandgap semiconductor based large-aperture photoconductive antennas pumped by UV lasers

Intense sub-terahertz radiation from wide-bandgap semiconductor based large-aperture photoconductive antennas pumped by UV lasers

Intense terahertz radiation: generation and application

Efficiency of Photoconductive Terahertz Generation in Nitrogen-Doped Diamonds

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