Pulsed THz radiation under ultrafast optical discharge of vacuum photodiode

Abstract

In this paper, we first present an experimental demonstration of terahertz radiation pulse generation with energy up to 5 pJ under the electron emission during ultrafast optical discharge of a vacuum photodiode. We use a femtosecond optical excitation of metallic copper photocathode for the generation of ultrashort electron bunch and up to 45 kV/cm external electric field for the photo-emitted electron acceleration. Measurements of terahertz pulses energy as a function of emitted charge density, incidence angle of optical radiation and applied electric field have been provided. Spectral and polarization characteristics of generated terahertz pulses have also been studied. The proposed semi-analytical model and simulations in COMSOL Multiphysics prove the experimental data and allow for the optimization of experimental conditions aimed at flexible control of radiation parameters.

Graphical abstract

Keywords

Electron emission / Vacuum photodiode / Ultrafast excitation / Terahertz

References

[1] Zhang, X.C., Xu, J.: Introduction to THz Wave Photonics. Springer, New York (2010)

[2] Grischkowsky, D., Keiding, S., Van Exter, M., Fattinger, C.: Farinfrared time-domain spectroscopy with terahertz beams of dielectrics and semiconductors. J. Opt. Soc. Am. B 7(10), 2006–2015 (1990)

[3] Chan, W.L., Deibel, J., Mittleman, D.M.: Imaging with terahertz radiation. Rep. Prog. Phys. 70(8), 1325–1379 (2007)

[4] Jen, C.Y., Richter, C.: Sample thickness measurement with THz-TDS: resolution and implications. Int. J. Infrared Millim. Terahertz Waves 35(10), 840–859 (2014)

[5] Ushakov, A., Chizhov, P., Bukin, V., Savel’ev, A., Garnov, S.: Broadband in-line terahertz 2D imaging: comparative study with time-of-flight, cross-correlation, and Fourier transform data processing. J. Opt. Soc. Am. B 35(5), 1159–1164(2018)

[6] Fattinger, C., Grischkowsky, D.: Terahertz beams. Appl. Phys. Lett. 54(6), 490–492 (1989)

[7] Obraztsov, P.A., Bulgakova, V.V., Chizhov, P.A., Ushakov, A.A., Gets, D.S., Makarov, S.V., Bukin, V.V.: Hybrid perovskite terahertz photoconductive antenna. Nanomaterials (Basel) 11(2), 313 (2021)

[8] Hamster, H., Sullivan, A., Gordon, S., Falcone, R.W.: Short-pulse terahertz radiation from high-intensity-laser-produced plasmas. Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics 49(1), 671–677(1994)

[9] Cook, D.J., Hochstrasser, R.M.: Intense terahertz pulses by four-wave rectification in air. Opt. Lett. 25(16), 1210–1212 (2000)

[10] Ushakov, A.A., Chizhov, P.A., Andreeva, V.A., Panov, N.A., Shipilo, D.E., Matoba, M., Nemoto, N., Kanda, N., Konishi, K., Bukin, V.V., Kuwata-Gonokami, M., Kosareva, O.G., Garnov, S.V., Savel’ev, A.B.: Ring and unimodal angular-frequency distribution of THz emission from two-color femtosecond plasma spark. Opt. Express 26(14), 18202–18213(2018)

[11] Ushakov, A.A., Panov, N.A., Chizhov, P.A., Shipilo, D.E., Bukin, V.V., Savel’ev, A.B., Garnov, S.V., Kosareva, O.G.: Waveform, spectrum, and energy of backward terahertz emission from two-color femtosecond laser induced microplasma. Appl. Phys. Lett. 114(8), 081102(2019)

[12] Mokrousova, D.V., Savinov, S.A., Seleznev, L.V., Rizaev, G.E., Koribut, A.V., Mityagin, Yu.A., Ionin, A.A., Nikolaeva, I.A., Shipilo, D.E., Panov, N.A., Ushakov, A.A., Savel’ev, A.B., Kosareva, O.G., Shkurinov, A.P.: Tracing air-breakdown plasma characteristics from single-color filament terahertz spectra. Int. J. Infrared Millim. Terahertz Waves 41(9), 1105–1113(2020)

[13] Chizhov, P.A., Volkov, R.V., Bukin, V.V., Ushakov, A.A., Garnov, S.V., Savel’ev-Trofimov, A.B.: Generation of terahertz radiation by focusing femtosecond bichromatic laser pulses in a gas or plasma. Quantum Electron. 43(4), 347–349(2013)

[14] Tcypkin, A.N., Ponomareva, E.A., Putilin, S.E., Smirnov, S.V., Shtumpf, S.A., Melnik, M.V., e, Y., Kozlov, S.A., Zhang, X.C.: Flat liquid jet as a highly efficient source of terahertz radiation. Opt. Express 27(11), 15485–15494(2019)

[15] Hebling, J., Yeh, K.L., Hoffmann, M.C., Bartal, B., Nelson, K.A.: Generation of high-power terahertz pulses by tilted-pulse-front excitation and their application possibilities. J. Opt. Soc. Am. B 25(7), B6(2008)

[16] Vicario, C., Ovchinnikov, A.V., Ashitkov, S.I., Agranat, M.B., Fortov, V.E., Hauri, C.P.: Generation of 0.9-mJ THz pulses in DSTMS pumped by a Cr:Mg₂SiO₄ laser. Opt. Lett. 39(23), 6632–6635(2014)

[17] Chai, X., Ropagnol, X., Ovchinnikov, A., Chefonov, O., Ushakov, A., Garcia-Rosas, C.M., Isgandarov, E., Agranat, M., Ozaki, T., Savel’ev, A.: Observation of crossover from intraband to interband nonlinear terahertz optics. Opt. Lett. 43(21), 5463–5466(2018)

[18] Carron, N.J., Longmire, C.L.: Electromagnetic pulse produced by obliquely incident X Rays. IEEE Trans. Nucl. Sci. 23(6), 1897–1902 (1976)

[19] Lazarev, Y.N., Petrov, P.V.: Generation of an intense directed ultrashort electromagnetic pulse. JETP Lett. 60(9), 512–515 (1995)

[20] Lazarev, Y.N., Petrov, P.V.: Microwave generation using a superluminal source. J. Exp. Theor. Phys. 88(5), 926–935 (1999)

[21] Klatt, G., Hilser, F., Qiao, W., Beck, M., Gebs, R., Bartels, A., Huska, K., Lemmer, U., Bastian, G., Johnston, M.B., Fischer, M., Faist, J., Dekorsy, T.: Terahertz emission from lateral photo-Dember currents. Opt. Express 18(5), 4939–4947 (2010)

[22] Kononenko, V.V., Bukin, V.V., Komlenok, M.S., Zavedeev, E.V., Kononenko, T.V., Dezhkina, M.A., Ratnikov, P.P., Dolmatov, T.V., Chizhov, P.A., Ushakov, A.A., Konov, V.I., Garnov, S.V.: A diamond terahertz large aperture photoconductive antenna biased by a longitudinal field. Photonics 10(10), 1169(2023)

[23] Kondrat’ev, A.A.: Angular and spectral distributions of the broad-band radiation of a photoemission source. Tech. Phys. 63(3), 434–437(2018)

[24] Lazarev, Y.N., Petrov, P.V., Syrtsova, Y.G.: Photoemission pulsed source of wide-band directional electromagnetic radiation. Tech. Phys. 49(11), 1477–1485 (2004)

[25] Potapov, A.V., Zavolokov, E.V., Kondrat’ev, A.A., Pkhaiko, N.A., Sorokin, I.A., Goncharenko, B.G., Luzanov, V.A., Salov, V.D.: Generation of ultrawideband electromagnetic radiation by a vacuum photodiode with anode with a sapphire input window. Tech. Phys. 66(3), 491–495(2021)

[26] Andreeva, V.A., Kosareva, O.G., Panov, N.A., Shipilo, D.E., Solyankin, P.M., Esaulkov, M.N., González de Alaiza Martínez, P., Shkurinov, A.P., Makarov, V.A., Bergé, L., Chin, S.L.: Ultrabroad terahertz spectrum generation from an air-based filament plasma. Phys. Rev. Lett. 116(6), 063902(2016)

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