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| Author | Fedorov, G. E.; Stepanova, T. S.; Gazaliev, A. S.; Gaiduchenko, I. A.; Kaurova, N. S.; Voronov, B. M.; Goltzman, G. N. | ||||
| Title | Asymmetric devices based on carbon nanotubes for terahertz-range radiation detection | Type | Journal Article | ||
| Year | 2016 | Publication | Semicond. | Abbreviated Journal | Semicond. |
| Volume | 50 | Issue | 12 | Pages | 1600-1603 |
| Keywords | carbon nanotubes, CNT detectors | ||||
| Abstract | Various asymmetric detecting devices based on carbon nanotubes (CNTs) are studied. The asymmetry is understood as inhomogeneous properties along the conducting channel. In the first type of devices, an inhomogeneous morphology of the CNT grid is used. In the second type of devices, metals with highly varying work functions are used as the contact material. The relation between the sensitivity and detector configuration is analyzed. Based on the data obtained, approaches to the development of an efficient detector of terahertz radiation, based on carbon nanotubes are proposed. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1063-7826 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1776 | |||
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| Author | Ryzhii, V.; Otsuji, T.; Ryzhii, M.; Leiman, V. G.; Fedorov, G.; Goltzman, G. N.; Gayduchenko, I. A.; Titova, N.; Coquillat, D.; But, D.; Knap, W.; Mitin, V.; Shur, M. S. | ||||
| Title | Two-dimensional plasmons in lateral carbon nanotube network structures and their effect on the terahertz radiation detection | Type | Journal Article | ||
| Year | 2016 | Publication | J. Appl. Phys. | Abbreviated Journal | J. Appl. Phys. |
| Volume | 120 | Issue | 4 | Pages | 044501 (1 to 13) |
| Keywords | carbon nanotubes, CNT detectors, plasmons | ||||
| Abstract | We consider the carrier transport and plasmonic phenomena in the lateral carbon nanotube (CNT) networks forming the device channel with asymmetric electrodes. One electrode is the Ohmic contact to the CNT network and the other contact is the Schottky contact. These structures can serve as detectors of the terahertz (THz) radiation. We develop the device model for collective response of the lateral CNT networks which comprise a mixture of randomly oriented semiconductor CNTs (s-CNTs) and quasi-metal CNTs (m-CNTs). The proposed model includes the concept of the collective two-dimensional (2D) plasmons in relatively dense networks of randomly oriented CNTs (CNT “felt”) and predicts the detector responsivity spectral characteristics exhibiting sharp resonant peaks at the signal frequencies corresponding to the 2D plasmonic resonances. The detection mechanism is the rectification of the ac current due the nonlinearity of the Schottky contact current-voltage characteristics under the conditions of a strong enhancement of the potential drop at this contact associated with the plasmon excitation. The detector responsivity depends on the fractions of the s- and m-CNTs. The burning of the near-contact regions of the m-CNTs or destruction of these CNTs leads to a marked increase in the responsivity in agreement with our experimental data. The resonant THz detectors with sufficiently dense lateral CNT networks can compete and surpass other THz detectors using plasmonic effects at room temperatures. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0021-8979 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1777 | |||
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| Author | Dube, I.; Jiménez, D.; Fedorov, G.; Boyd, A.; Gayduchenko, I.; Paranjape, M.; Barbara, P. | ||||
| Title | Understanding the electrical response and sensing mechanism of carbon-nanotube-based gas sensors | Type | Journal Article | ||
| Year | 2015 | Publication | Carbon | Abbreviated Journal | Carbon |
| Volume | 87 | Issue | Pages | 330-337 | |
| Keywords | carbon nanotubes, CNT detectors, field effect transistors, FET | ||||
| Abstract | Gas sensors based on carbon nanotube field effect transistors (CNFETs) have outstanding sensitivity compared to existing technologies. However, the lack of understanding of the sensing mechanism has greatly hindered progress on calibration standards and customization of these nano-sensors. Calibration requires identifying fundamental transistor parameters and establishing how they vary in the presence of a gas. This work focuses on modeling the electrical response of CNTFETs in the presence of oxidizing (NO2) and reducing (NH3) gases and determining how the transistor characteristics are affected by gas-induced changes of contact properties, such as the Schottky barrier height and width, and by the doping level of the nanotube. From the theoretical fits of the experimental transfer characteristics at different concentrations of NO2 and NH3, we find that the CNTFET response can be modeled by introducing changes in the Schottky barrier height. These changes are directly related to the changes in the metal work function of the electrodes that we determine experimentally, independently, with a Kelvin probe. Our analysis yields a direct correlation between the ON – current and the changes in the electrode metal work function. Doping due to molecules adsorbed at the carbon-nanotube/metal interface also affects the transfer characteristics. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0008-6223 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1778 | |||
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| Author | Akhmadishina, K. F.; Bobrinetskiy, I. I.; Komarov, I. A.; Malovichko, A. M.; Nevolin, V. K.; Fedorov, G. E.; Golovin, A. V.; Zalevskiy, A. O.; Aidarkhanov, R. D. | ||||
| Title | Fast-response biological sensors based on single-layer carbon nanotubes modified with specific aptamers | Type | Journal Article | ||
| Year | 2015 | Publication | Semicond. | Abbreviated Journal | Semicond. |
| Volume | 49 | Issue | 13 | Pages | 1749-1753 |
| Keywords | carbon nanotubes, CNT detectors | ||||
| Abstract | The possibility of the fabrication of a fast-response biological sensor based on a composite of single-layer carbon nanotubes and aptamers for the specific detection of proteins is shown. The effect of modification of the surface of the carbon nanotubes on the selectivity and sensitivity of the sensors is investigated. It is shown that carboxylated nanotubes have a better selectivity for detecting thrombin. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1063-7826 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1783 | |||
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| Author | Vodolazov, D. Y.; Manova, N. N.; Korneeva, Y. P.; Korneev, A. A. | ||||
| Title | Timing jitter in NbN superconducting microstrip single-photon detector | Type | Journal Article | ||
| Year | 2020 | Publication | Phys. Rev. Applied | Abbreviated Journal | Phys. Rev. Applied |
| Volume | 14 | Issue | 4 | Pages | 044041 (1 to 8) |
| Keywords | NbN SSPD, SNSPD | ||||
| Abstract | We experimentally study timing jitter of single-photon detection by NbN superconducting strips with width w ranging from 190 nm to 3μm. We find that timing jitter of both narrow (190 nm) and micron-wide strips is about 40 ps at currents where internal detection efficiency η saturates and it is close to our instrumental jitter. We also calculate intrinsic timing jitter in wide strips using the modified time-dependent Ginzburg-Landau equation coupled with a two-temperature model. We find that with increasing width the intrinsic timing jitter increases and the effect is most considerable at currents where a rapid growth of η changes to saturation. We relate it with complicated vortex and antivortex dynamics, which depends on a photon’s absorption site across the strip and its width. The model also predicts that at current close to depairing current the intrinsic timing jitter of a wide strip could be about ℏ/kBTc (Tc is a critical temperature of superconductor), i.e., the same as for a narrow strip. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 2331-7019 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1788 | |||
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| Author | Shein, K. V.; Zarudneva, A. A.; Emel’yanova, V. O.; Logunova, M. A.; Chichkov, V. I.; Sobolev, A.S.; Zav’yalov, V. V.; Lehtinen, J. S.; Smirnov, E. O.; Korneeva, Y. P.; Korneev, A. A.; Arutyunov, K. Y. | ||||
| Title | Superconducting microstructures with high impedance | Type | Journal Article | ||
| Year | 2020 | Publication | Phys. Solid State | Abbreviated Journal | Phys. Solid State |
| Volume | 62 | Issue | 9 | Pages | 1539-1542 |
| Keywords | superconducting channels, SIS, inetic inductance, tunneling contacts, high impedance | ||||
| Abstract | The transport properties of two types of quasi-one-dimensional superconducting microstructures were investigated at ultra-low temperatures: the narrow channels close-packed in the shape of meander, and the chains of tunneling contacts “superconductor-insulator-superconductor.” Both types of the microstructures demonstrated high value of high-frequency impedance and-or the dynamic resistance. The study opens up potential for using of such structures as current stabilizing elements with zero dissipation. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1063-7834 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1789 | |||
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| Author | Korneeva, Y. P.; Manova, N. N.; Florya, I. N.; Mikhailov, M. Y.; Dobrovolskiy, O. V.; Korneev, A. A.; Vodolazov, D. Y. | ||||
| Title | Different single-photon response of wide and narrow superconducting MoxSi1−x strips | Type | Journal Article | ||
| Year | 2020 | Publication | Phys. Rev. Applied | Abbreviated Journal | Phys. Rev. Applied |
| Volume | 13 | Issue | 2 | Pages | 024011 (1 to 7) |
| Keywords | MoSi SSPD, SNSPD | ||||
| Abstract | The photon count rate (PCR) of superconducting single-photon detectors made of MoxSi1−x films shaped as a 2-μm-wide strip and a 115-nm-wide meander strip line is studied experimentally as a function of the dc biasing current at different values of the perpendicular magnetic field. For the wide strip, a crossover current Icross is observed, below which the PCR increases with an increasing magnetic field and above which it decreases. This behavior contrasts with the narrow MoxSi1−x meander, for which no crossover current is observed, thus suggesting different photon-detection mechanisms in the wide and narrow strips. Namely, we argue that in the wide strip the absorbed photon destroys superconductivity locally via the vortex-antivortex mechanism for the emergence of resistance, while in the narrow meander superconductivity is destroyed across the whole strip line, forming a hot belt. Accordingly, the different photon-detection mechanisms associated with vortices and the hot belt determine the qualitative difference in the dependence of the PCR on the magnetic field. | ||||
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| ISSN | 2331-7019 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1790 | |||
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| Author | Neroev, V. V.; Iomdina, E. N.; Khandzhyan, A. T.; Khodzhabekyan, N. V.; Sengaeva, M. D.; Ivanova, A. V.; Seliverstov, S. V.; Teplyakova, K. O.; Goltsman, G. N. | ||||
| Title | Experimental study of the effect of corneal hydration and its biomechanical properties on the results of photorefractive keratectomy | Type | Journal Article | ||
| Year | 2021 | Publication | Vestn. Oftalmol. | Abbreviated Journal | Vestn. Oftalmol. |
| Volume | 137 | Issue | 3 | Pages | 68-75 |
| Keywords | THz scanning, cornea, photorefractive keratectomy, medicine | ||||
| Abstract | Water content in the cornea may affect the outcome of its excimer laser ablation, especially in presbyopic patients with myopic refraction. This hypothesis can be tested by scanning the cornea in the terahertz (THz) range to determine its hydration level. Purpose: To study the effect of hydration of the cornea determined by non-contact THz scanning and its biomechanical parameters on the results of photorefractive keratectomy (PRK) in an experiment. Material and methods: PRK was performed using the Nidek EC-5000 QUEST excimer laser on 8 rabbit eyes. Corneal hydration was evaluated by determining the reflection coefficient (RC) in the THz electromagnetic radiation range before PRK, after 3-5 days, and after 1, 2, 3, and 4 months. Clinical examination included autorefractometry, assessment of corneal thickness and other anatomical and optical parameters of the anterior eye segment (Galilei G6, Ziemer Ophthalmic Systems AG 6.0.2, Switzerland), measurement of corneal hysteresis (CH) and corneal resistance factor (CRF) using the Ocular Response Analyzer (ORA; Reichert, USA), as well as tear production (Schirmer test). Results: The initial water content in the cornea has a significant effect on the thickness of the removed layer, i.e. on the PRK effect, with correlation coefficient of Rs= -0.976 (p<0.01). The correlation between CH and the ablation depth is less pronounced (Rs=0.643), and CRF had no correlation with it (Rs= -0.089). Biomechanical indicators of the cornea depend on its hydration: changes in CH and CRF after excimer laser ablation qualitatively coincide with changes in RC, the correlation coefficient between RC and the initial value of CH is R= -0.619 (moderate negative correlation). Conclusion: THz scanning is an effective non-contact technology for monitoring corneal hydration level. The mismatch of the hypoeffect of keratorefractive excimer laser intervention planned for patients with presbyopia with the actual outcome can be caused by individual decrease in the initial water content in the cornea. |
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| Language | Russian | Summary Language | Original Title | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1794 | |||
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| Author | Smirnov, K.; Moshkova, M.; Antipov, A.; Morozov, P.; Vakhtomin, Y. | ||||
| Title | The cascade switching of the photon number resolving superconducting single-photon detectors | Type | Journal Article | ||
| Year | 2021 | Publication | IEEE Trans. Appl. Supercond. | Abbreviated Journal | IEEE Trans. Appl. Supercond. |
| Volume | 31 | Issue | 2 | Pages | 1-4 |
| Keywords | PNR SSPD, SNSPD | ||||
| Abstract | In this article, present the first detailed study of cascade switching in superconducting photon number resolving detectors. The detectors were made in the form of four parallel nanowires, coupled with the single-mode optical fiber and mounted into a closed-cycle refrigerator with a temperature of 2.1 K. We found out the value of additional false pulses (N cas.sw. ) appearing due to cascade switching and showed that it is possible to set up the detector bias current that corresponds to a high level of the detection efficiency and a low level of N cas.sw. simultaneously. We reached the detection efficiency of 60% and N cas.sw. = 0.3%. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1051-8223 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1796 | |||
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| Author | Zhang, X.; Lita, A. E.; Smirnov, K.; Liu, H. L.; Zhu, D.; Verma, V. B.; Nam, S. W.; Schilling, A. | ||||
| Title | Strong suppression of the resistivity near the superconducting transition in narrow microbridges in external magnetic fields | Type | Journal Article | ||
| Year | 2020 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
| Volume | 101 | Issue | 6 | Pages | 060508 (1 to 6) |
| Keywords | MoSi, WSi films | ||||
| Abstract | We have investigated a series of superconducting bridges based on homogeneous amorphous WSi and MoSi films, with bridge widths w ranging from 2 to 1000μm and film thicknesses d∼4−6 and 100 nm. Upon decreasing the bridge widths below the respective Pearl lengths, we observe in all cases distinct changes in the characteristics of the resistive transitions to superconductivity. For each of the films, the resistivity curves R(B,T) separate at a well-defined and field-dependent temperature T∗(B) with decreasing the temperature, resulting in a dramatic suppression of the resistivity and a sharpening of the transitions with decreasing bridge width w. The associated excess conductivity in all the bridges scales as 1/w, which may suggest either the presence of a highly conducting region that is dominating the electric transport, or a change in the vortex dynamics in narrow enough bridges. We argue that this effect can only be observed in materials with sufficiently weak vortex pinning. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 2469-9950 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 1800 | |||
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| Author | Kitaeva, G. K.; Kornienko, V. V.; Kuznetsov, K. A.; Pentin, I. V.; Smirnov, K. V.; Vakhtomin, Y. B. | ||||
| Title | Direct detection of the idler THz radiation generated by spontaneous parametric down-conversion | Type | Journal Article | ||
| Year | 2019 | Publication | Opt. Lett. | Abbreviated Journal | Opt. Lett. |
| Volume | 44 | Issue | 5 | Pages | 1198-1201 |
| Keywords | HEB applications | ||||
| Abstract | We study parametric down-conversion (PDC) of optical laser radiation in the strongly frequency non-degenerate regime which is promising for the generation of quantum-correlated pairs of extremely different spectral ranges, the optical and the terahertz (THz) ones. The possibility to detect tenuous THz-frequency photon fluxes generated under low-gain spontaneous PDC is demonstrated using a hot electron bolometer. Then experimental dependences of the THz radiation power on the detection angle and on the pump intensity are analyzed. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0146-9592 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | PMID:30821747 | Approved | no | ||
| Call Number | Serial | 1801 | |||
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| Author | Lobanov, Y. V.; Vakhtomin, Y. B.; Pentin, I. V.; Khabibullin, R. A.; Shchavruk, N. V.; Smirnov, K. V.; Silaev, A. A. | ||||
| Title | Characterization of the THz quantum cascade laser using fast superconducting hot electron bolometer | Type | Journal Article | ||
| Year | 2018 | Publication | EPJ Web Conf. | Abbreviated Journal | EPJ Web Conf. |
| Volume | 195 | Issue | Pages | 04004 (1 to 2) | |
| Keywords | NbN HEB, QCL | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 2100-014X | ISBN | Medium | ||
| Area | Expedition | Conference | 3rd International Conference “Terahertz and Microwave Radiation: Generation, Detection and Applications” (TERA-2018) | ||
| Notes | Approved | no | |||
| Call Number | Serial | 1808 | |||
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| Author | Zolotov, P. I.; Vakhtomin, Yu. B.; Divochiy, A. V.; Seleznev, V. A.; Smirnov, K. V. | ||||
| Title | Technology development of resonator-based structures for efficiency increasing of NBN detectors of IR single photons | Type | Journal Article | ||
| Year | 2016 | Publication | Proc. 5th Int. Conf. Photonics and Information Optics | Abbreviated Journal | Proc. 5th Int. Conf. Photonics and Information Optics |
| Volume | Issue | Pages | 115-116 | ||
| Keywords | NbN SSPD | ||||
| Abstract | This paper presents a technology of fabrication of NbN superconductive single- photon detectors, using resonator structures. The main results are related to optimization of the process of NbN sputtering over substrate with metallic mirrors and SiO 2 /Si 3 N 4 layers /4 thick. Investigation of the quantum efficiency of fabricated devices at 1.6 K on 1.55 μm showed triple-magnified value compared to standard Si/NbN structures. | ||||
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| Language | Russian | Summary Language | Original Title | ||
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| ISSN | ISBN | 978-5-7262-2215-8 | Medium | ||
| Area | Expedition | Conference | |||
| Notes | http://fioconf.mephi.ru/files/2015/12/FIO2016-Sbornik.pdf Разработка технологии создания резонаторных структур для увеличения квантовой эффективности NBN детекторов ИК-фотонов | Approved | no | ||
| Call Number | Serial | 1811 | |||
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| Author | Smirnov, K.; Vachtomin, Y.; Divochiy, A.; Antipov, A.; Goltsman, G. | ||||
| Title | The limitation of noise equivalent power by background radiation for infrared superconducting single photon detectors coupled to standard single mode optical fibers | Type | Journal Article | ||
| Year | 2015 | Publication | Rus. J. Radio Electron. | Abbreviated Journal | Rus. J. Radio Electron. |
| Volume | Issue | 5 | Pages | ||
| Keywords | NbN SSPD | ||||
| Abstract | We investigated the minimum level of the dark count rates and noise equivalent power of superconducting single photon detectors coupled to standard single mode optical fibers. We found that background radiation limits the minimum level of the dark count rates. We also proposed the effective method for reducing background radiation out of the required spectral range of the detector. Measured noise equivalent power of detector reaches 8.9×10-19 W×Hz1/2 at a wavelength of 1.55 μm and quantum efficiency 35%. | ||||
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| Notes | 14 pages | Approved | no | ||
| Call Number | Serial | 1813 | |||
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| Author | Smirnov, A. V.; Karmantsov, M. S.; Smirnov, K. V.; Vakhtomin, Y. B.; Masterov, D. V.; Tarkhov, M. A.; Pavlov, S. A.; Parafin, A. E. | ||||
| Title | Terahertz response of thin-film YBCO bolometers | Type | Journal Article | ||
| Year | 2012 | Publication | Tech. Phys. | Abbreviated Journal | Tech. Phys. |
| Volume | 57 | Issue | 12 | Pages | 1716-1719 |
| Keywords | YBCO HEB | ||||
| Abstract | The bolometric response of high-temperature thin-film YBCO superconducting detectors to an electromagnetic radiation with a frequency of 2.5 THz is measured for the first time. The minimum value of the noise-equivalent power of the detectors is 3.5 × 10−9 W/Hz−−−√. The feasibility of further increasing the sensitivity of the detectors is discussed. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1063-7842 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1817 | |||
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