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  1. AU="Obraztsov, Petr A"
  2. AU="Santacaterina, Fabio"
  3. AU="Rosales, M E"
  4. AU=Kallmes D F
  5. AU="Ge, Xiaomeng"
  6. AU="Michaloliakos, I"
  7. AU="Rayce, Signe Boe"
  8. AU="Heiman Joel"
  9. AU=Rashedi Jalil
  10. AU="Rodríguez-Tovar, Aída Verónica"

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  1. Article ; Online: 11-GHz waveguide Nd:YAG laser CW mode-locked with single-layer graphene.

    Okhrimchuk, Andrey G / Obraztsov, Petr A

    Scientific reports

    2015  Volume 5, Page(s) 11172

    Abstract: We report stable, passive, continuous-wave (CW) mode-locking of a compact diode-pumped waveguide Nd:YAG laser with a single-layer graphene saturable absorber. The depressed cladding waveguide in the Nd:YAG crystal is fabricated with an ultrafast laser ... ...

    Abstract We report stable, passive, continuous-wave (CW) mode-locking of a compact diode-pumped waveguide Nd:YAG laser with a single-layer graphene saturable absorber. The depressed cladding waveguide in the Nd:YAG crystal is fabricated with an ultrafast laser inscription method. The saturable absorber is formed by direct deposition of CVD single-layer graphene on the output coupler. The few millimeter-long cavity provides generation of 16-ps pulses with repetition rates in the GHz range (up to 11.3 GHz) and 12 mW average power. Stable CW mode-locking operation is achieved by controlling the group delay dispersion in the laser cavity with a Gires-Tournois interferometer.
    Language English
    Publishing date 2015-06-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep11172
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Hybrid Perovskite Terahertz Photoconductive Antenna.

    Obraztsov, Petr A / Bulgakova, Vladislava V / Chizhov, Pavel A / Ushakov, Alexander A / Gets, Dmitry S / Makarov, Sergey V / Bukin, Vladimir V

    Nanomaterials (Basel, Switzerland)

    2021  Volume 11, Issue 2

    Abstract: Hybrid organic-inorganic perovskites, while well examined for photovoltaic applications, remain almost completely unexplored in the terahertz (THz) range. These low-cost hybrid materials are extremely attractive for THz applications because their ... ...

    Abstract Hybrid organic-inorganic perovskites, while well examined for photovoltaic applications, remain almost completely unexplored in the terahertz (THz) range. These low-cost hybrid materials are extremely attractive for THz applications because their optoelectronic properties can be chemically engineered with relative ease. Here, we experimentally demonstrate the first attempt to apply solution-processed polycrystalline films of hybrid perovskites for the development of photoconductive terahertz emitters. By using the widely studied methylammonium-based perovskites MAPbI
    Language English
    Publishing date 2021-01-26
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano11020313
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Many-particle excitations in non-covalently doped single-walled carbon nanotubes.

    Eremin, Timofei V / Obraztsov, Petr A / Velikanov, Vladimir A / Shubina, Tatiana V / Obraztsova, Elena D

    Scientific reports

    2019  Volume 9, Issue 1, Page(s) 14985

    Abstract: Doping of single-walled carbon nanotubes leads to the formation of new energy levels which are able to participate in optical processes. Here, we investigate (6,5)-single walled carbon nanotubes doped in a solution of hydrochloric acid using optical ... ...

    Abstract Doping of single-walled carbon nanotubes leads to the formation of new energy levels which are able to participate in optical processes. Here, we investigate (6,5)-single walled carbon nanotubes doped in a solution of hydrochloric acid using optical absorption, photoluminescence, and pump-probe transient absorption techniques. We find that, beyond a certain level of doping, the optical spectra of such nanotubes exhibit the spectral features related to two doping-induced levels, which we assign to a localized exciton [Formula: see text] and a trion T, appearing in addition to an ordinary exciton [Formula: see text]. We evaluate the formation and relaxation kinetics of respective states and demonstrate that the kinetics difference between E
    Language English
    Publishing date 2019-10-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-019-50333-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Interfacial THz generation from graphene/Si mixed-dimensional van der Waals heterostructure.

    Yao, Zehan / Huang, Yuanyuan / Zhu, Lipeng / Obraztsov, Petr A / Du, Wanyi / Zhang, Longhui / Xu, Xinlong

    Nanoscale

    2019  Volume 11, Issue 35, Page(s) 16614–16620

    Abstract: Even though Si is the most cost efficient and extensively used semiconductor in modern optoelectronics, it is not considered to be an effective THz emitter due to its low carrier drift velocity and small saturated built-in electric field from the ... ...

    Abstract Even though Si is the most cost efficient and extensively used semiconductor in modern optoelectronics, it is not considered to be an effective THz emitter due to its low carrier drift velocity and small saturated built-in electric field from the inversion layer. Herein, we present an effective way to enhance THz generation using a graphene/Si Schottky junction (GSSJ) excited with a femtosecond laser under electrical gating without rapid saturation and with high carrier drift velocity. This mixed-dimensional van der Waals interface demonstrates large saturation pump fluence with an invalid inversion layer by removing the native oxide on the Si surface. The THz emission amplitude from GSSJ effectively increases with the gate voltage. The THz emission from GSSJ under the same excitation conditions is stronger than that from the surface of InAs (100) and GaAs (100). The results not only show an efficient THz emission from GSSJ but also demonstrate the ability of THz generation for probing the mixed-dimensional van der Waals interface.
    Language English
    Publishing date 2019-08-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/c9nr03570b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: "Terhune-like" transformation of the terahertz polarization ellipse "mutually induced" by three-wave joint propagation in liquid.

    Balakin, Alexei V / Garnov, Sergey V / Makarov, Vladimir A / Kuzechkin, Nikolay A / Obraztsov, Petr A / Solyankin, Peter M / Shkurinov, Alexander P / Zhu, Yiming

    Optics letters

    2018  Volume 43, Issue 18, Page(s) 4406–4409

    Abstract: In this Letter, we show experimentally for the first time, to the best of our knowledge, the possibility to observe the effect of polarization mutual action of three elliptically polarized waves, with one of them at terahertz frequency, when they ... ...

    Abstract In this Letter, we show experimentally for the first time, to the best of our knowledge, the possibility to observe the effect of polarization mutual action of three elliptically polarized waves, with one of them at terahertz frequency, when they propagate in the isotropic nonlinear medium. When three light pulses are propagated at frequencies
    Language English
    Publishing date 2018-09-11
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.43.004406
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: All-optical control of ultrafast photocurrents in unbiased graphene.

    Obraztsov, Petr A / Kaplas, Tommi / Garnov, Sergey V / Kuwata-Gonokami, Makoto / Obraztsov, Alexander N / Svirko, Yuri P

    Scientific reports

    2014  Volume 4, Page(s) 4007

    Abstract: Graphene has recently become a unique playground for studying light-matter interaction effects in low-dimensional electronic systems. Being of strong fundamental importance, these effects also open a wide range of opportunities in photonics and ... ...

    Abstract Graphene has recently become a unique playground for studying light-matter interaction effects in low-dimensional electronic systems. Being of strong fundamental importance, these effects also open a wide range of opportunities in photonics and optoelectronics. In particular, strong and broadband light absorption in graphene allows one to achieve high carrier densities essential for observation of nonlinear optical phenomena. Here, we make use of strong photon-drag effect to generate and optically manipulate ultrafast photocurrents in graphene at room temperature. In contrast to the recent reports on injection of photocurrents in graphene due to external or built-in electric field effects and by quantum interference, we force the massless charge carriers to move via direct transfer of linear momentum from photons of incident laser beam to excited electrons in unbiased sample. Direction and amplitude of the drag-current induced in graphene are determined by polarization, incidence angle and intensity of the obliquely incident laser beam. We also demonstrate that the irradiation of graphene with two laser beams of the same wavelength offers an opportunity to manipulate the photocurrents in time domain. The obtained all-optical control of the photocurrents opens new routes towards graphene based high-speed and broadband optoelectronic devices.
    Language English
    Publishing date 2014-02-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep04007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Broadband light-induced absorbance change in multilayer graphene.

    Obraztsov, Petr A / Rybin, Maxim G / Tyurnina, Anastasia V / Garnov, Sergey V / Obraztsova, Elena D / Obraztsov, Alexander N / Svirko, Yuri P

    Nano letters

    2011  Volume 11, Issue 4, Page(s) 1540–1545

    Abstract: We report the ultrafast light-induced absorbance change in CVD-grown multilayer graphene. Using femtosecond pump-probe measurements in 1100-1800 nm spectral range, we revealed broadband absorbance change when the probe photon energy was higher than that ... ...

    Abstract We report the ultrafast light-induced absorbance change in CVD-grown multilayer graphene. Using femtosecond pump-probe measurements in 1100-1800 nm spectral range, we revealed broadband absorbance change when the probe photon energy was higher than that of the pump photon. The observed phenomenon is interpreted in terms of the Auger recombination and impact ionization playing a significant role in the dynamics of photoexcited carriers in graphene.
    MeSH term(s) Graphite/chemistry ; Light ; Materials Testing ; Nanostructures/chemistry ; Nanostructures/ultrastructure ; Particle Size ; Scattering, Radiation
    Chemical Substances Graphite (7782-42-5)
    Language English
    Publishing date 2011-03-28
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/nl104303c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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