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  • 1
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 130, No. 1B ( 2021-06-29), p. 43-51
    Abstract: This study proposes a photonic crystal fiber made of fused silica glass, with the core infiltrated with chloroform as a new source of supercontinuum (SC) spectrum. We numerically study the guiding properties of the fiber structure in terms of characteristic dispersion and mode area of the fundamental mode. Based on the results, we optimized the structural geometries of the CHCl3-core photonic crystal fiber to support the broadband SC generations. The fiber structure with a lattice constant of 1 μm, a filling factor of 0.8, and the diameter of the first-ring air holes equaling 0.5 μm operates in all-normal dispersion. The SC with a broadened spectral bandwidth of 0.64 to 1.80 μm is formed by using a pump pulse with a wavelength of 850 nm, 120 fs duration, and power of 0.833 kW. That fiber would be a good candidate for all-fiber SC sources as cost-effective alternative to glass core fibers.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2021
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  • 2
    In: Optics Communications, Elsevier BV, Vol. 537 ( 2023-06), p. 129441-
    Type of Medium: Online Resource
    ISSN: 0030-4018
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 1468811-6
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  • 3
    In: Photonics Letters of Poland, Photonics Society of Poland, Vol. 13, No. 1 ( 2021-03-15), p. 1-
    Abstract: This paper proposes a pure silica photonic crystal fiber (PCF), having its core infiltrated with olive oil, which allows achieving an ultra-flattened normal dispersion regime. As a result, the optimization processes allows us to achieve an ultra-flat normal dispersion in the range of over 682 nm within the wavelength range from 1446 to 2128 nm. Besides, the nonlinear coefficient of the selected PCF structure is extremely high (9.54 x 109 W-1.km-1 at 1550 nm). The proposed PCF structure could be very helpful in investigating the supercontinuum generation which has many potential applications in various promising areas such as spectroscopy, medical diagnostics, etc. Full Text: PDF ReferencesJ.M.Dudley, G.Genty and S.Coen, "Supercontinuum generation in photonic crystal fiber", Rev. Mod. Phys. 78(2006). CrossRef T.Udem, R.Holzwarth and T.W.Hänsch, "Optical frequency metrology", Nature 416 233-7(2002). CrossRef S.Moon and D.Y.Kim, "Ultra-high-speed optical coherence tomography with a stretched pulse supercontinuum source", Opt. Express 14 11575-84 (2006). CrossRef G.P.Agrawal. "Chapter 11 - Highly Nonlinear Fibers", Nonlinear Fiber Optics (Oxford: Academic Press 2013) CrossRef V.R.K. Kumar, A.K. George, J.C. Knight, P.S.J. Russell, "Tellurite photonic crystal fiber", Opt. Exp. 11 2641-2645 (2003). CrossRef R. Buczynski, H. T. Bookey, D. Pysz, R. Stepien, I. Kujawa, J. E. McCarthy, A. J. Waddie, A. K. Kar and M. R. Taghizadeh, "Supercontinuum generation up to 2.5 μm in photonic crystal fiber made of lead-bismuth-galate glass", Laser Phys. Lett.7 666-72 (2010). CrossRef F.G.Omenetto, N.A.Wolchover, M.R. Wehner, M. Ross, A. Efimov, A.J. Taylor, V.V.R.K. Kumar, A.K. George, J.C. Knight, N.Y. Joly, P.St.J. Russell, "Spectrally smooth supercontinuum from 350 nm to 3 µm in sub-centimeter lengths of soft-glass photonic crystal fibers.", Opt. Express 14 4928-4934 (2010). CrossRef H. L.Van, V. C. Long, H. T. Nguyen, A. M. Nguyen, R. Buczyński, R. Kasztelanic, "Application of ethanol infiltration for ultra-flattened normal dispersion in fused silica photonic crystal fibers", Laser Physics, 28 115106 (2018). CrossRef J. Pniewski, T. Stefaniuk, H. L. Van, V. C. Long, L. C. Van, R. Kasztelanic, G. Stępniewski, A. Ramaniuk, M. Trippenbach, and R. Buczynski, "Dispersion engineering in nonlinear soft glass photonic crystal fibers infiltrated with liquids", Appl. Opt. 55, 5033-5040(2016). CrossRef H. D. Quang, J. Pniewski, H. L.Van, R. Aleksandr. V. C. Long, B. Krzysztof, D. X. Khoa, K. Mariusz, and R. Buczynski, "Optimization of optical properties of photonic crystal fibers infiltrated with carbon tetrachloride for supercontinuum generation with subnanojoule femtosecond pulses", Applied Optics, Vol. 57, No. 15, 1559-128X (2018). CrossRef M.Chemnitz,M.Gebhardt, C.Gaida, F.Stutzki, J.Kobelke, J.Limpert, A.Tünnermann and M.A. Schmidt, "Hybrid soliton dynamics in liquid-core fibres", Nat. Commun. 8 42 (2017). CrossRef S.Kedenburg, A.Steinmann, R.Hegenbarth, T.Steinle and H.Giessen, "Nonlinear refractive indices of nonlinear liquids: wavelength dependence and influence of retarded response", Appl. Phys. B 117 803-16 (2014). CrossRef E.Sani and A.Dell'Oro, "Spectral optical constants of ethanol and isopropanol from ultraviolet to far infrared", Opt. Mater. 60 137-41 (2016). CrossRef S.T. Wu, "Absorption measurements of liquid crystals in the ultraviolet, visible, and infrared", J. Appl. Phys. 84 4462-4465 (1998). CrossRef Z. Mousavi, B. Ghafary, M.H. Majles Ara, "Fifth- and third- order nonlinear optical responses of olive oil blended with natural turmeric dye using z-scan technique", Journal of Molecular Liquids, https://doi.org/10.1016/j.molliq.2019.04.077 CrossRef Web page: Refractive Index Info: https://refractiveindex.info. CrossRef I. Bodurov, I. Vlaeva, M. Marudova, T. Yovcheva, K. Nikolova, T. Eftimov, V. Plachkova, "Detection of adulteration in olive oils using optical and thermal methods", Bulgarian Chemical Communications, Volume 45, Special Issue B (pp. 81-85) (2013) DirectLink
    Type of Medium: Online Resource
    ISSN: 2080-2242
    Language: Unknown
    Publisher: Photonics Society of Poland
    Publication Date: 2021
    detail.hit.zdb_id: 2573654-1
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  • 4
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2011
    In:  Science and Technology Development Journal Vol. 14, No. 1 ( 2011-03-30), p. 72-77
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 14, No. 1 ( 2011-03-30), p. 72-77
    Abstract: ZnO:In thin films was deposited on glass substrate by magnetron DC sputtering method from ceramic target. The ZnO:In ceramic targets have concentrations of In2O3 varying between 1 and 4wt%. The ZnO:In film has the resistivity with value of 1.79 x 10-3 Ωcm, at a layer thickness of about 1μm, corresponding with ZnO:In target (2%wt In2O3), at the substrate temperature of about 240- 0C. All ZnO:In thin films have the transparence above 85% in the visible spectra.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2011
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  • 5
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2014
    In:  Science and Technology Development Journal Vol. 17, No. 4 ( 2014-12-31), p. 27-35
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 17, No. 4 ( 2014-12-31), p. 27-35
    Abstract: The immobilisation of DNA probe on gold electrode surface with the optimal concentration is very important to develop of the DNA biosensors. In this study, we conducted an experiment that determined the optimal concentration of the probe attached the electrodes for the maximum hybridization efficiency. We have used a method that control the surface density of DNA probe by annealing probe modified by thiol and mercaptohexanol. Based on the linear relationship between the mol ratio and density probe, we control probe concentration in the sensor fabricating process as well as the molecular density of DNA probes on the electrode surface. The result of probe concentration 500 nM is optimal for hybidization with DNA target.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2014
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  • 6
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2015
    In:  Science and Technology Development Journal Vol. 18, No. 1 ( 2015-03-31), p. 23-33
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 18, No. 1 ( 2015-03-31), p. 23-33
    Abstract: Sb doped tin oxide films (ATO) were fabricated on Quart glasses from (SnO2 + Sb2O3) mixture ceramic target by direct current (DC) magnetron sputtering in Ar ambient gas at working pressure of 2.10-3 torr. X ray diffraction (XRD), Hall - effect measurements and UV-vis spectra were performed to characterize the deposited films. The substrate temperature of films was investigated for two ways. Films were annealed in Ar ambient gas after deposited at room temperature in one way. They were deposited directly with different temperatures in the other. It is found that the fabricated of ATO films in the first way was easier than the other. Deposited films showed p type electrical property, polycrystalline tetragonal rutile structure and their average transmittance was above 80 % in visible light range at the optimum annealing temperature of 500oC. The best electrical properties of film were obtained on 10 %wt Sb2O3 doped SnO2 target with its resistivity, hole concentration and Hall mobility are 0.55 Ω.cm, 1.2.1019 cm-3 and 0.54 cm2V-1s-1, respectively.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2015
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  • 7
    In: ChemNanoMat, Wiley, Vol. 9, No. 8 ( 2023-08)
    Abstract: Surface‐enhanced Raman spectroscopy (SERS)‐active generally using include nanosized noble metals, semiconductors, or their combination, all of which are mostly subject to challenges such as difficulty in controlling fabrication processes, chemical stability of sensor substrates, reproducibility of amplified Raman signals. To address these concerns, novel SERS substrates were produced by combining zeolitic imidazolate framework‐8 (ZIF‐8) and Ag nanoparticles into stacked layers where the ZIF‐8 acted as “trap nets” of the reporter molecules (organic toxins, rhodamine B, methylene blue and crystal violet). Two different multilayers on a glass slide generated by reversing the stacking order, i. e., Ag/ZIF‐8/glass and ZIF‐8/Ag/glass produced different SERS results. The ZIF‐8/Ag/glass multilayer demonstrated a higher enhancement factor (∼10 13 ), the lower limit of detection (∼10 −14  M) of rhodamine B, with a relative standard deviation of 4.2% for crystal violet, which was 10 times greater than the former arrangement. The sensitivity of the SERS substrates via exposure to low concentrations of organic dyes species was measured. Structural, surface morphology and optical features of the substrates were further examined. This result can pave the way for the development of metal‐organic framework‐based SERS platform and provide new insights into its application for label‐free sensors in biomedical diagnosis and environmental monitoring.
    Type of Medium: Online Resource
    ISSN: 2199-692X , 2199-692X
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2827071-X
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  • 8
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2016
    In:  Science and Technology Development Journal Vol. 19, No. 4 ( 2016-12-31), p. 137-146
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 19, No. 4 ( 2016-12-31), p. 137-146
    Abstract: Transparent Ga-doped tin oxide (GTO) thin films were fabricated on quartz glasses from (SnO2 + Ga2O3) mixture ceramic target by direct current (DC) magnetron sputtering in Ar gas at the pressure of 4.10-3torr. X ray diffraction (XRD), Hall - effect and UV-vis spectra measurements were performed to characterize the deposited films. Films were deposited directly with different temperatures in order to investigate the influence of temperature on their electrical and optical propertises. After that GTO films were deposited at 400 oC and then were annealed in Ar gas at different temperature in order to eliminate acceptor and donor compensation. Deposited films showed p-type electrical property, polycrystalline tetragonal rutile structure and their average transmittance above 80 % in visible light range at the optimum annealing temperature of 550 oC. In addition, p-type conductivity was also confirm by the non-linear characteristics of a p-type GTO/n Si. The best electrical properties of film were obtained on 15 % wt Ga2O3-doped SnO2 target with its resistivity, hole concentration and Hall mobility were 0,63 .cm, 3,3.1018 cm-3 and 3,01 cm2V-1s-1, respectively.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2016
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  • 9
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2009
    In:  Science and Technology Development Journal Vol. 12, No. 3 ( 2009-02-15), p. 5-15
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 12, No. 3 ( 2009-02-15), p. 5-15
    Abstract: Al2O3 is used widely for their properties of high dielectric, anti- erosion and anti- atomic oxygen effects. This compound was investigated by scientists in various methods. At the first time, the High Technology Laboratory of the Natural Sciences University in Ho Chi Minh city fabricated Al2O3 thin film by rf sputtering method. Optical properties of the film were investigated by UV-VIS spectroscopy. Its composition were determined by IR transmittance and reflectance absorption (ATR) spectroscopy methods. The structures of thin film were determined by X-ray diffraction (XRD) and AFM spectroscopies. Furthermore, the phase changes by annealing was investigated by IR transmittance absorption spectroscopy and XRD spectra.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2009
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  • 10
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2009
    In:  Science and Technology Development Journal Vol. 12, No. 12 ( 2009-06-28), p. 59-64
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 12, No. 12 ( 2009-06-28), p. 59-64
    Abstract: The Ti-doped Zno films were deposited onto glass substrates from ceramic targets ZnO with various Ti concentrations using a DC magnetron sputtering. The experimental results show that all thin films are transparent and conductive oxide films, with the appropriate Ti concentration (⁓1.5% Ti), the conductance of films can be improved. Optical characteristics of thin films was determined by UV-V is spectroscopy. The thickness of thin films was measured by Stylus method. The electrical resistivity was measured by four-point probe, and the roughness of films was determined by AFM.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2009
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