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  • 1.
    AlSalhi, M S.
    et al.
    King Saud University, Saudi Arabia .
    Atif, M
    King Saud University, Saudi Arabia; National Institute of Laser and Optronics, Nilore, Islamabad, Pakistan.
    Ansari, A A.
    King Saud University, Saudi Arabia .
    Khun, Kimleang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Hussain Ibupoto, Zafar
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. King Saud University, Riyadh, Saudi Arabia.
    Growth and characterization of ZnO nanowires for optical applications2013In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 23, no 6, article id 065602Article in journal (Refereed)
    Abstract [en]

    In the present work, cerium oxide CeO2 nanoparticles were synthesized by the sol-gel method and used for the growth of ZnO nanorods. The synthesized nanoparticles were studied by x-ray diffraction (XRD) and Raman spectroscopic techniques. Furthermore, these nanoparticles were used as the seed layer for the growth of ZnO nanorods by following the hydrothermal growth method. The structural study of ZnO nanorods was carried out by means of field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM) and XRD techniques. This study demonstrated that the grown ZnO nanorods are well aligned, uniform, of good crystal quality and have diameters of less than 200 nm. Energy dispersive x-ray (EDX) analysis revealed that the ZnO nanorods are composed only of zinc, cerium as the seed atom, and oxygen atoms, with no other impurities in the grown nanorods. Moreover, a photoluminescence (PL) approach was applied for the optical characterization, and it was observed that the near-band-edge (NBE) emission was the same as that of the zinc acetate seed layer, however the green and orange/red emission peaks were slightly raised due to possibly higher levels of defects in the cerium oxide seeded ZnO nanorods. This study provides an alternative approach for the controlled synthesis of ZnO nanorods using cerium oxide nanoparticles as the seed nucleation layer, improving both the morphology of the nanorods and the performance of devices based upon them.

  • 2.
    Bogdanova, M.V.
    et al.
    Institute of Spectroscopy, Russian Academy of Sciences, Troitsk 142190, Russian Federation.
    Eiderman, S.L.
    Institute of Spectroscopy, Russian Academy of Sciences, Troitsk 142190, Russian Federation.
    Lozovik, Yu.E.
    Institute of Spectroscopy, Russian Academy of Sciences, Troitsk 142190, Russian Federation.
    Willander, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Absorption spectra versus field distribution for metal-dielectric three-dimensional photonic crystals2008In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 18, no 4, p. 417-423Article in journal (Refereed)
    Abstract [en]

    The absorption spectra of three-dimensional metal-dielectric photonic crystals (PCs) are studied using computer simulation by the finite difference time domain method and the layered Korringa-Kohn-Rostoker method. The band structure of a three-dimensional dielectric PC is obtained by the plane wave expansion method. The explanation of absorption spectra of PC based on its comparison with the band structure and Fabry-Perot resonances inside a PC plate is given. The intensity distribution of an electric field using FDTD inside the metal-dielectric PC for three various structures is analyzed. It is shown that spherical cavities in a dielectric PC "focus" the field inside cavities at certain wavelengths. This leads to an increase of absorption at these wavelengths if metal spheres are located in the centers of those cavities. This effect can be considered as an analogue of the Borrmann effect in X-ray spectroscopy. © 2008 MAIK Nauka.

  • 3.
    Bossi, Alesandra
    et al.
    University of Verona, Italy .
    Vareija, M.
    Cranfield University, UK.
    Piletska, Elena
    Cranfield University, UK.
    Turner, Anthony
    Cranfield University, UK.
    Meglinski, Igor
    University of Otago, Dunedin, New Zealand .
    Piletsky, Sergey
    Cranfield University, UK.
    Ice matrix inreconfigurable microfluidic systems2013In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 23, no 7Article in journal (Refereed)
    Abstract [en]

    Microfluidic devices find many applications in biotechnologies. Here, we introduce a flexible and biocompatible microfluidic ice-based platform with tunable parameters and configuration of microfluidic patterns that can be changed multiple times during experiments. Freezing and melting of cavities, channels and complex relief structures created and maintained in the bulk of ice by continuous scanning of an infrared laser beam are used as a valve action in microfluidic systems. We demonstrate that pre-concentration of samples and transport of ions and dyes through the open channels created can be achieved in ice microfluidic patterns by IR laser-assisted zone melting. The proposed approach can be useful for performing separation and sensing processes in flexible reconfigurable microfluidic devices.

  • 4.
    Fakhar-e-Alam, M.
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Kishwar, S.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Khan, Y.
    Pakistan Institute for Engineering and Applied Science.
    Siddique, M.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Atif, M.
    Pakistan Institute for Engineering and Applied Science.
    Nur, Omer
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Willander, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Tumoricidal Effects of Nanomaterials in HeLa Cell Line2011In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 21, no 11, p. 1978-1988Article in journal (Refereed)
    Abstract [en]

    The current study exhibits the cellular response of HeLa (cervical cancer) cells to metal oxides ultrafine nanomaterials e.g. manganese dioxide nanowires (MnO(2) NRs), iron oxide nanoparticles (Fe(2)O(3) NPs) and zinc oxide nanorods (ZnO NRs) as bare and as conjugated with photosensitizers. For cytotoxic evaluations, the cellular morphology, (MTT) assay, reactive oxygen species (ROS) production were used for cases with and without photo sensitizer as well illuminated with UV-visible laser exposed conditions. Three different photosensitizers were tested. These are 5-aminolevulinic acid (5-ALA), Photofrin (R), and protoporphyrin dimethyl ester (PPDME). Significant loss in cell viability was noted with 100-500 mu g/ml in bare and conjugated forms of the metal oxides used. The effect was insignificant with lower concentrations (0.05-50 mu g/ml). While notable anticancer effect of 5-ALA under 30 J/cm(2) of diode laser irradiation was noted as compared to other photo sensitizer. By increasing the UV irradiation time of labeled cells, generation of ROS was observed, indicating the possibility of achieving efficient photodynamic therapy (PDT).

  • 5.
    Fakhar-e-Alam, M
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. Pakistan Institute of Engineering and Applied Sciences, Pakistan.
    Usman Ali, Syed
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. , NED University of Engineering and Technology, Pakistan.
    Hussain Ibupoto, Zafar
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Atif, M
    Pakistan Institute of Engineering and Applied Sciences, Pakistan;Physics and Astronomy Department, College of Science, King Saud University, Saudi Arabia.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Erratum: “Phototoxic effects of zinc oxide nanowires (ZnO NWs) complexed with 5-ALA in RD cell line” (Laser Physics 21, 2165 (2011))2012In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 22, no 2, p. 476-476Article in journal (Other academic)
    Abstract [en]

    n/a

  • 6.
    Fakhar-e-Alam, M.
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Usman Ali, Syed
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Hussain Ibupoto, Zafar
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Atif, M.
    Pakistan Institute for Engineering and Applied Science.
    Willander, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Phototoxic effects of zinc oxide nanowires (ZnO NWs) complexed with 5-ALA in RD cell line2011In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 21, no 12, p. 2165-2170Article in journal (Refereed)
    Abstract [en]

    In this current study, we have manifested the photosensitizing effects of zinc oxide nanowires (ZnO NWs) in dark as well as under ultra violet light exposure with 240 nm of UV region, using human muscle cancer (Rhybdomyosarcoma cells, RD) as in vitro experimental model. We have fabricated ZnO-NWs on the tip of borosilicate glass capillaries (0.5 mu m diameter) and were conjugated using 5-aminolevulinic acid (ALA) for the efficient intracellular drug delivery. When ZnO NWs were applied on tumor localizing drugs with non ionizing illumination, then excited drug liberates reactive oxygen species (ROS), effecting mitochondria and nucleus resulting in cell necrosis within few minutes. During investigations, we observed that when ZnO-NWs grown on intracellular tip was excited by using 240 nm of UV light, as a resultant 625 nm of emitted red light were used as appetizer in the presence of 5-ALA for chemical reaction, which produces singlet oxygen, responsible for cell necrosis. Morphological changes of necrosed cells were examined under microscopy. Moreover, Viability of controlled and treated RD cells with optimum dose of light (UV-Visible) has been assessed by MTT assay as well as reactive oxygen species (ROS) detection.

  • 7.
    Fakhar-e-Alam, M
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan.
    Usman Ali, Syed
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. Department of Electronic Engineering, NED University of Engineering and Technology, Karachi, Pakistan.
    Ibupoto, Zafar Hussain
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Atif, M
    Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan; Physics and Astronomy Department, College of Science, King Saud University, Riyadh, Saudi Arabia.
    Willander, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Erratum: “Phototoxic Effects of Zinc Oxide Nanowires (ZnO NWs) Complexed with 5-ALA in RD Cell Line” (Laser Physics 21, 2165 (2011))2012In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 22, no 1, p. 338-338Article in journal (Other academic)
    Abstract [en]

    n/a

  • 8.
    Lozovik, Yu.E.
    et al.
    Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow oblast 142190, Russian Federation.
    Eiderman, S.L.
    Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow oblast 142190, Russian Federation.
    Willander, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    The two-dimensional superconducting photonic crystal2007In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 17, no 9, p. 1183-1186Article in journal (Refereed)
    Abstract [en]

    The band structure of a two-dimensional superconducting photonic crystal is studied. The temperature dependence of the photonic band structure in a wide temperature region below the superconducting transition is analyzed. It is found that the photonic crystal has two full band gaps and two incomplete band gaps, which are shifted to the high frequency region with decreasing temperature. © 2007 MAIK "Nauka/Interperiodica".

  • 9.
    Lozovik, Yurii E
    et al.
    Russian Academy of Science.
    Dobryakov, A L
    Humboldt Universität, Berlin.
    Kovalenko, S A
    Humboldt Universität, Berlin.
    Merkulova, S P
    Russian Academy of Science.
    Volkov, S Y
    Russian Academy of Science.
    Willander, Magnus
    Chalmers.
    Study of localization of carriers in disordered semiconductors by femtosecond spectroscopy2002In: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 12, no 4, p. 802-811Article in journal (Refereed)
    Abstract [en]

    A new method for determination of the mobility edge in disordered semiconductors by femtosecond pump-supercontinuum probe spectroscopy is presented. The method is based on the determination of the spectral dependence of a stretched exponential relaxation in a wide spectral range of probing, homega(probe) = 1.6-3.2 eV. The method is demonstrated for porous silicon. It is shown that the relaxation parameters for porous silicon have essential spectral dependence. The spectral dependence of stretched exponential index beta(omega) give unique information about existence and position of the mobility edge in disordered materials, and thus may be used as effective tool in manifestation of the transition from localized to delocalized relaxation regime on the femtosecond time scale.

1 - 9 of 9
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