Logo of the Laboratory of Terahertz in Prague Hynek Němec
member of a Laboratory of Terahertz Spectroscopy, Department of Dielectrics at Institute of Physics of the Czech Academy of Sciences 		Logo of the Institute of Physics

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  1. S. Faletič, A. Kyuldjiev, T. Lindner, D. Schnider, É. Izsa, M. Hömöstrei, P. Jenei, B. Aneva, D. D. Ivanova, H. Němec, F. Kundracik, and M. Plesch, Development of soft and hard skills of high-school students via Young Physicists’ Tournament, Eur. J. Phys. (in press) PDF file
  2. T. Troha, A. Singh, P. Kužel, and H. Němec, Dynamics of local photoconductivity in GaAs and InP investigated by a terahertz scanning near-field optical microscope, Phys. Rev. B 112, 045407 (2025). PDF file
  3. A. Singh, H. Němec, J. Kunc, and P. Kužel, Ultrafast terahertz conductivity in epitaxial graphene nanoribbons: an interplay between photoexcited and secondary hot carriers, J. Phys. D: Appl. Phys. 58, 045307 (2025). PDF file
  4. A. Singh, H. Němec, J. Kunc, and P. Kužel, Nanoscale terahertz conductivity and ultrafast dynamics of terahertz plasmons in periodic arrays of epitaxial graphene nanoribbons, Phys. Rev. Res. 6, 033063 (2024). PDF file
  5. T. Troha, F. Klimovič, T. Ostatnický, H. Němec, and P. Kužel, Photon-assisted ultrafast electron–hole plasma expansion in direct band semiconductors, Nanophotonics 13, 1859 (2024). PDF file
  6. T. Troha, F. Klimovič, T. Ostatnický, F. Kadlec, P. Kužel, and H. Němec, Ultrafast long-distance electron-hole plasma expansion in GaAs mediated by stimulated emission and reabsorption of photons, Phys. Rev. Lett. 130, 226301 (2023). PDF file
  7. P. Kumar, M. Šilhavík, M. R. Parida, H. Němec, J. Červenka, and P. Kužel, Terahertz charge transport dynamics in 3D graphene networks with localization and band regimes, Nanoscale Adv. 5, 2933 (2023). PDF file
  8. V. Pushkarev, H. Němec, V. C. Paingad, J. Maňák, V. Jurka, V. Novák, T. Ostatnický, and P. Kužel, Charge transport in single-crystalline GaAs nanobars: Impact of band bending revealed by terahertz spectroscopy, Adv. Funct. Mater. 32, 2107403 (2022). PDF file
  9. J. Kuchařík and H. Němec, Strong confinement-induced nonlinear terahertz response in semiconductor nanostructures revealed by Monte Carlo calculations, Phys. Rev. B 103, 205426 (2021). PDF file
  10. H. Němec, C. Kadlec, V. Goian, F. Borodavka, V. Železný, M. Kempa, K. Knížek, J. Hejtmánek, J. Buršík, and M. Soroka, Metal-insulator transition in (Pr,Y)0.7Ca0.3CoO3 in the far-infrared spectral region, Phys. Rev. B 102, 195105 (2020). PDF file
  11. P. Kužel and H. Němec, Terahertz spectroscopy of nanomaterials: a close look at charge-carrier transport, Adv. Opt. Mater. 8, 1900623 (2020). PDF file
  12. X. Su, X. Zeng, H. Němec, X. Zou, W. Zhang, M. Borgström, and A. Yartsev, Effect of hydrogen chloride etching on carrier recombination processes of indium phosphide nanowires, Nanoscale 11, 18550 (2019). PDF file
  13. J. Kuchařík, H. Němec, and T. Ostatnický, Terahertz conductivity and coupling between geometrical and plasmonic resonances in nanostructures, Phys. Rev. B 99, 035407 (2019). PDF file
  14. V. Skoromets, H. Němec, V. Goian, S. Kamba, and P. Kužel, Performance comparison of time-domain terahertz, multi-terahertz, and Fourier transform infrared spectroscopies, J. Infrared Milli. Terahz. Waves 39, 1249 (2018). PDF file
  15. J. Kuchařík and H. Němec, Terahertz conductivity of degenerate electron gas confined in 2D model nanostructures, Proc. SPIE 10756, 107560A (2018). PDF file
  16. T. Ostatnický, V. Pushkarev, H. Němec, and P. Kužel, Quantum theory of terahertz conductivity of semiconductor nanostructures, Phys. Rev. B 97, 085426 (2018). PDF file
  17. M. Šindler, C. Kadlec, P. Kužel, K. Ilin, M. Siegel, and H. Němec, Departure from BCS response in photoexcited superconducting NbN films observed by terahertz spectroscopy, Phys. Rev. B 97, 054507 (2018). PDF file
  18. C. Kadlec, V. Skoromets, F. Kadlec, H. Němec, H.-T. Chen, V. Jurka, K. Hruška, and P. Kužel, Electric-field tuning of a planar terahertz metamaterial based on strained SrTiO3 layers, J. Phys. D: Appl. Phys. 51, 054001 (2018). PDF file
  19. J. Kuchařík, H. Sopha, M. Krbal, I. Rychetský, P. Kužel, J. M. Macak, and H. Němec, Photoconductive, dielectric and percolation properties of anodic TiO2 nanotubes studied by terahertz spectroscopy, J. Phys. D: Appl. Phys. 51, 014004 (2018). PDF file
  20. V. Pushkarev, T. Ostatnický, H. Němec, T. Chlouba, F. Trojánek, P. Malý, M. Zacharias, S. Gutsch, D. Hiller, and P. Kužel, Quantum behavior of terahertz photoconductivity in silicon nanocrystals networks, Phys. Rev. B 95, 125424 (2017). PDF file
  21. S. Bamini, H. Němec, K. Žídek, M. Abdellah, M. J. Al-Marri, P. Chábera, C. Ponseca, K. Zheng, T. Pullerits, Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO, Phys. Chem. Chem. Phys. 19, 6006 (2017). PDF file
  22. V. Zajac, H. Němec, and P. Kužel, Picosecond charge transport in rutile at high carrier densities studied by transient terahertz spectroscopy, Phys. Rev. B 94, 115206 (2016). PDF file
  23. M. Krbal, J. Kuchařík, H. Sopha, H. Němec, and J. M. Macák, Charge transport in anodic TiO2 nanotubes studied by terahertz spectroscopy, Phys. Status Solidi Rapid Res. Lett. 10, 691 (2016). PDF file
  24. M. Šindler, C. Kadlec, F. Dominec, P. Kužel, C. Elissalde, A. Kassas, J. Lesseur, D. Bernard, P. Mounaix, and H. Němec, Bulk magnetic terahertz metamaterials based on dielectric microspheres, Opt. Exp. 24, 18340 (2016). PDF file
  25. H. Němec, K. Knížek, Z. Jirák, J. Hejtmánek, M. Soroka, and J. Buršík, Charge transport in thin layer NaxCoO2 (x ∼ 0.63) studied by terahertz spectroscopy, J. Phys.: Cond. Matter., in press J. Phys.: Cond. Matter. 28, 355601 (2016). Private PDF file
  26. F. D’Angelo, H. Němec, S. H. Parekh, P. Kužel, M. Bonn, and D. Turchinovich, Self-referenced ultra-broadband transient terahertz spectroscopy using air-photonics, Opt. Exp. 24, 10157 (2016). PDF file
  27. L. Nádvorník, P. Němec, T. Janda, K. Olejník, V. Novák, V. Skoromets, H. Němec, P. Kužel, F. Trojánek, T. Jungwirth, and J. Wunderlich, Long-range and high-speed electronic spin-transport at a GaAs/AlGaAs semiconductor interface, Sci. Rep. 6, 22901 (2016). PDF file
  28. V. Skoromets, C. Kadlec, H. Němec, D. Fattakhova-Rohlfing, and P. Kužel, Tunable dielectric properties of KTaO3 single crystals in the terahertz range, J. Phys. D 49, 065306 (2016). Private PDF file
  29. V. Skoromets, H. Němec, J. Kopeček, P. Kužel, K. Peters, D. Fattakhova-Rohlfing, A. Vetushka, M. Müller, K. Ganzerová, and A. Fejfar Conductivity Mechanisms in Sb-Doped SnO2 Nanoparticle Assemblies: DC and Terahertz Regime, J. Phys. Chem. C 119, 19485 (2015). Private PDF file
  30. H. Němec, V. Zajac, P. Kužel, P. Malý, S. Gutsch, D. Hiller, and M. Zacharias, Charge transport in silicon nanocrystal superlattices in the terahertz regime, Phys. Rev. B 91, 195443 (2015). PDF file
  31. K. Peters, P. Zeller, G. Štefanić, V. Skoromets, H. Němec, P. Kužel, and D. Fattakhova-Rohlfing, Water-dispersible small monodisperse electrically conducting antimony doped tin oxide nanoparticles, Chem. Mater. 27, 1090 (2015). Private PDF file
  32. F. Dominec, C. Kadlec, H. Němec, P. Kužel, and F. Kadlec, Transition between metamaterial and photonic-crystal behavior in arrays of dielectric rods, Opt. Exp. 22, 30492 (2014). PDF file
  33. V. Zajac, H. Němec, C. Kadlec, K. Kůsová, I. Pelant, and P. Kužel, THz photoconductivity in light-emitting surfaceoxidized Si nanocrystals: the role of large particles, New J. Phys 16, 093013 (2014). PDF file
  34. C. S. Ponseca, Jr., H. Němec, J. Wallentin, N. Anttu, J. P. Beech, A. Iqbal, M. Borgström, M.-E. Pistol, L. Samuelson, and A. Yartsev, Bulk-like transverse electron mobility in an array of heavily n-doped InP nanowires probed by terahertz spectroscopy, Phys. Rev. B 90, 085405 (2014). PDF file
  35. P. Kužel and H. Němec, Terahertz conductivity in nanoscaled systems: effective medium theory aspects, J. Phys. D: Appl. Phys., 47, 374005 (2014). Private PDF file
  36. S. A. Jensen, K.-J. Tielrooij, E. Hendry, M. Bonn, I. Rychetský, and H. Němec, Terahertz depolarization effects in colloidal TiO2 films reveal particle morphology, J. Phys. Chem. C 118, 1191 (2014). Private PDF file
  37. V. Skoromets, H. Němec, C. Kadlec, D. Fattakhova-Rohlfing, and P. Kužel, Electric-field-tunable defect mode in one-dimensional photonic crystal operating in the terahertz range, Appl. Phys. Lett. 102, 241106 (2013). PDF file
  38. H. Němec, V. Zajac, I. Rychetský, D. Fattakhova-Rohlfing, B. Mandlmeier, T. Bein, Z. Mics, and P. Kužel, Charge transport in TiO2 films with complex percolation pathways investigated by time-resolved terahertz spectroscopy IEEE T. THz. Science Technol. 3, 302 (2013). Private PDF file
  39. R. Yahiaoui, H. Němec, C. Kadlec, F. Kadlec, P. Kužel, U.-C. Chung, C. Elissalde, M. Maglione, and P. Mounaix, TiO2 microsphere-based metamaterials exhibiting effective magnetic response in the terahertz regime, Appl. Phys. A 109, 891 (2012). Private PDF file
  40. N. Vukmirović, C. Ponseca, H. Němec, A. Yartsev, and V. Sundström, Insights into the charge carrier terahertz mobility in polyfluorenes from large-scale atomistic simulations and time-resolved terahertz spectroscopy, J. Phys. Chem. C 116, 19665 (2012). Private PDF file
  41. C. Ponseca, H. Němec, N. Vukmirović, S. Fusco, E. Wang, M. Andersson, P. Chábera, A. Yartsev, and V. Sundström, Electron and hole contributions to the terahertz photoconductivity of a conjugated polymer:fullerene blend identified, J. Phys. Chem. Lett. 3, 2442 (2012). Private PDF file
  42. J. Mrozek and H. Němec, Calculation of terahertz conductivity spectra in semiconductors with nanoscale modulation, Phys.Rev. B 86, 07 5308 (2012). PDF file
  43. L. Fekete, H. Němec, Z. Mics, F. Kadlec, P. Kužel, V. Novák, J. Lorinčík, M. Martin, J. Mangeney, J. C. Delagnes, and P. Mounaix, Ultrafast carrier response of Br+-irradiated In0.53Ga0.47As excited at telecommunication wavelengths, J. Appl. Phys. 111, 09 3721 (2012). PDF file
  44. H. Němec, C. Kadlec, F. Kadlec, P. Kužel, R. Yahiaoui, U-C. Chung, C. Elissalde, M. Maglione, and P. Mounaix, Resonant magnetic response of TiO2 microspheres at terahertz frequencies, Appl. Phys. Lett. 100, 06 1117 (2012). PDF file
  45. V. Skoromets, F. Kadlec, C. Kadlec, H. Němec, I. Rychetský, G. Panaitov, V. Müller, D. Fattakhova-Rohlfing, P. Moch, and P. Kužel, Tuning of dielectric properties of SrTiO3 in the terahertz range, Phys. Rev. B 84, 17 4121 (2011). PDF file
  46. Z. Mics, H. Němec, I. Rychetský, P. Kužel, P. Formánek, P. Malý, and P. Němec, Charge transport and localization in nanocrystalline CdS films: a time-resolved terahertz spectroscopy study, Phys. Rev. B 83, 15 5326 (2011). PDF file
  47. H. Němec, Z. Mics, M. Kempa, P. Kužel, O. Hayden, Y. Liu, T. Bein, and D. Fattakhova-Rohlfing, Tuning the conduction mechanism in niobium-doped titania nanoparticle networks, J. Phys. Chem. C 115, 6968 (2011). Private PDF file
  48. R. Yahiaoui, H. Němec, P. Kužel, F. Kadlec, C. Kadlec, and P. Mounaix, Tunable THz metamaterials based on an array of paraelectric SrTiO3 rods, Appl. Phys. A 103, 689 (2011). Private PDF file
  49. H. Němec, I. Kratochvílová, P. Kužel, J. Šebera, A. Kochalska, J. Nožár, and S. Nešpůrek, Charge carrier mobility in poly[methyl(phenyl)silylene] studied by time-resolved terahertz spectroscopy and molecular modelling, Phys. Chem. Chem. Phys. 13, 2850 (2011). Private PDF file
  50. H. Němec, P. Kužel, and V. Sundström, Charge transport in nanostructured materials for solar energy conversion studied by time-resolved terahertz spectroscopy, J. Photochem. Photobiol. A 215, 123 (2010). Private PDF file
  51. P. Kužel, H. Němec, F. Kadlec, and C. Kadlec, Gouy shift correction for highly accurate refractive index retrieval in time-domain terahertz spectroscopy, Opt. Exp. 18, 15338 (2010). PDF file
  52. H. Němec, J. Rochford, O. Taratula, E. Galoppini, P. Kužel, T. Polívka, A. Yartsev, and V. Sundström, Influence of the electron-cation interaction on electron mobility in dye-sensitized ZnO and TiO2 nanocrystals: a study using ultrafast terahertz spectroscopy, Phys. Rev. Lett. 104, 19 7401 (2010). PDF file
  53. I. Kratochvílová, T. Todorciuc, K. Král, H. Němec, M. Bunček, J. Šebera, S. Záliš, Z. Vokáčová, V. Sychrovský, L. Bednárová, P. Mojzeš, and B. Schneider, Charge transport in DNA oligonucleotides with various base-pairing patterns, J. Phys. Chem. B 114, 5196 (2010). Private PDF file
  54. H. Němec, P. Kužel, F. Kadlec, D. Fattakhova-Rohlfing, J. Szeifert, T. Bein, V. Kalousek, and J. Rathouský, Ultrafast terahertz photoconductivity in nanocrystalline mesoporous TiO2 films, Appl. Phys. Lett. 96, 06 2103 (2010). PDF file
  55. C. Kadlec, V. Skoromets, F. Kadlec, H. Němec, J. Schubert, G. Panaitov, and P. Kužel, Temperature and electric field tuning of the ferroelectric soft mode in a strained SrTiO3/DyScO3 heterostructure, Phys. Rev. B 80, 17 4116 (2009). PDF file
  56. R. Yahiaoui, H. Němec, P. Kužel, F. Kadlec, C. Kadlec, and P. Mounaix, Broadband dielectric terahertz metamaterials with negative permeability, Opt. Lett. 34, 3541 (2009). Private PDF file
  57. J. C. Delagnes, P. Mounaix, H. Němec, L. Fekete, F. Kadlec, P. Kužel, M. Martin, and J Mangeney, High photocarrier mobility in ultrafast ion-irradiated In0.53Ga0.47As for terahertz applications, J. Phys. D 42, 19 5103 (2009). Private PDF file
  58. H. Němec, H.-K. Nienhuys, E. Perzon, F. Zhang, O. Inganäs, P. Kužel, and V. Sundström, Ultrafast conductivity in a low-band-gap polyphenylene and fullerene blend studied by terahertz spectroscopy, Phys. Rev. B 79, 24 5326 (2009). PDF file
  59. H. Němec, P. Kužel, F. Kadlec, C. Kadlec, R. Yahiaoui, and P. Mounaix, Tunable terahertz metamaterials with negative permeability, Phys. Rev. B 79, 24 1108(R) (2009). PDF file
  60. H. Němec, P. Kužel, and V. Sundström, Far-infrared response of free charge carriers localized in semiconductor nanoparticles, Phys. Rev. B 79, 11 5309 (2009). PDF file
  61. L. Fekete, P. Kužel, H. Němec, F. Kadlec, A. Dejneka, J. Stuchlík, and A. Fejfar, Ultrafast carrier dynamics in microcrystalline silicon probed by time-resolved terahertz spectroscopy, Phys. Rev. B 79, 11 5306 (2009). PDF file
  62. C. Kadlec, F. Kadlec, H. Němec, P. Kužel, J. Schubert, and G. Panaitov, High tunability of the soft mode in strained SrTiO3/DyScO3 multilayers, J. Phys.:Cond. Matter. 21, 11 5902 (2009) Private PDF file
  63. H. Němec, L. Fekete, F. Kadlec, P. Kužel, M. Martin, J. Mangeney, J. C. Delagnes, and P. Mounaix, Ultrafast carrier dynamics in Br+-bombarded InP studied by optical pump — terahertz probe spectroscopy, Phys. Rev. B 78, 23 5206 (2008). PDF file
  64. H. Němec, H.-K. Nienhuys, F. Zhang, O. Inganäs, A. Yartsev, and V. Sundström, Charge carrier dynamics in alternating polyfluorene copolymer:fullerene blends probed by terahertz spectroscopy J. Phys. Chem. C 112, 6558 (2008). Private PDF file
  65. L. Fekete, F. Kadlec, H. Němec, and P. Kužel, Fast one-dimensional photonic crystal modulators for the terahertz range, Opt. Exp. 15, 8898 (2007). PDF file
  66. P. Kužel, F. Kadlec, and H. Němec, Propagation of terahertz pulses in photoexcited media: Analytical theory for layered systems, J. Chem. Phys. 127, 02 4506 (2007). Private PDF file
  67. H. Němec, P. Kužel, J.-L. Coutaz, and J. Čtyroký, Transmission properties and band structure of a segmented dielectric waveguide for the terahertz range, Opt. Commun. 273, 99 (2007). Private PDF file
  68. L. Fekete, F. Kadlec, P. Kužel, and H. Němec, Ultrafast opto-terahertz photonic crystal modulator, Opt. Lett. 32, 680 (2007). Private PDF file
  69. L. Fekete, H. Němec, F. Kadlec, P. Kužel, J. Stuchlík, A. Fejfar, J. Kočka, Carrier dynamics in microcrystalline silicon studied by time-resolved terahertz spectroscopy, J. Noncryst. Solids 352, 2846 (2006). Private PDF file
  70. H. Němec, F. Kadlec, P. Kužel, L. Duvillaret, and J.-L. Coutaz, Independent determination of the complex refractive index and wave impedance by time-domain terahertz spectroscopy, Opt. Commun. 260, 175 (2006). Private PDF file
  71. P. Kužel, F. Kadlec, H. Němec, R. Ott, E. Hollmann, and N. Klein, Dielectric tunability of SrTiO3 thin films in the terahertz range, Appl. Phys. Lett 88, 10 2901 (2006). PDF file
  72. H. Němec, F. Kadlec, S. Surendran, P. Kužel, and P. Jungwirth, Ultrafast far-infrared dynamics probed by terahertz pulses: A frequency domain approach. I. Model systems, J. Chem. Phys. 122, 10 4503 (2005). Private PDF file
  73. H. Němec, F. Kadlec, C. Kadlec, P. Kužel, and P. Jungwirth, Ultrafast far-infrared dynamics probed by terahertz pulses: A frequency domain approach. II. Applications, J. Chem. Phys. 122, 10 4504 (2005). Private PDF file
  74. H. Němec, P. Kužel, L. Duvillaret, A. Pashkin, M. Dressel, and M. T. Sebastian, Highly tunable photonic crystal filter for the terahertz range, Opt. Lett. 30, 549 (2005). Private PDF file
  75. F. Kadlec, H. Němec, and P. Kužel, Optical two-photon absorption in GaAs measured by optical-pump terahertz-probe spectroscopy, Phys. Rev. B 70, 12 5205 (2004). PDF file
  76. H. Němec, L. Duvillaret, F. Garet, P. Kužel, P. Xavier, J. Richard, and D. Rauly, Thermally tunable filter for terahertz range based on a one-dimensional photonic crystal with a defect, J. Appl. Phys. 96, 4072 (2004). PDF file
  77. H. Němec, P. Kužel, F. Garet, and L. Duvillaret, Time-domain terahertz study of defect formation in one-dimensional photonic crystals, Appl. Opt. 43, 1965 (2004). Private PDF file
  78. H. Němec, L. Duvillaret, F. Quemeneur, and P. Kužel, Defect modes caused by twinning in one-dimensional photonic crystals, J. Opt. Soc. Am. B 21, 548 (2004). Private PDF file
  79. A. Pashkin, M. Kempa, H. Němec, F. Kadlec, and P. Kužel, Phase-sensitive time-domain terahertz reflection spectroscopy, Rev. Sci. Instrum., 74, 4711 (2003). PDF file
  80. H. Němec, F. Kadlec, and P. Kužel, Methodology of an optical pump-terahertz probe experiment: An analytical frequency-domain approach, J. Chem. Phys. 117, 8454 (2002). Private PDF file
  81. H. Němec, A. Pashkin, P. Kužel, M. Khazan, S. Schnüll, and I. Wilke, Carrier dynamics in low-temperature grown GaAs studied by terahertz emission spectroscopy, J. Appl. Phys. 90, 1303 (2001). PDF file

Book chapters

  1. J. Kuchařík and H. Němec, Transition Between Localized and Delocalized Terahertz Conductivity in Modulated Nanostructures Studied by Monte-Carlo Calculations, In: Terahertz (THz), Mid Infrared (MIR) and Near Infrared (NIR) Technologies for Protection of Critical Infrastructures Against Explosives and CBRN, NATO Science for Peace and Security Series B: Physics and Biophysics book series, Springer (2021).
  2. P. Kužel and H. Němec, Metamaterials, In: Terahertz Spectroscopy and Imaging, Springer Series in Optical Sciences, Vol. 171, pp. 569 – 610 (2012).
  3. H. Němec, E. Galoppini, H. Imahori, and V. Sundström, Solar Energy Conversion – Natural to Artificial, In: Comprehensive Nanoscience and Technology, vol. 2, pp. 325 – 359 (2011).

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