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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
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Hussain Ibupoto, Zafar
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
    Willander, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan. King Saud University, Riyadh, Saudi Arabia.
    Growth and characterization of ZnO nanowires for optical applications2013Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 23, nr 6, artikkel-id 065602Artikkel i tidsskrift (Fagfellevurdert)
    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
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    Absorption spectra versus field distribution for metal-dielectric three-dimensional photonic crystals2008Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 18, nr 4, s. 417-423Artikkel i tidsskrift (Fagfellevurdert)
    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 systems2013Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 23, nr 7Artikkel i tidsskrift (Fagfellevurdert)
    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.
    Chen, Daru
    et al.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Fu, Hongyan
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Liu, W.
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
    Single-longitudinal-mode erbium-doped fiber laser based on a fiber Bragg grating Fabry-Perot filter2007Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 17, nr 10, s. 1246-1248Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A novel single-longitudinal-mode (SLM) erbium-doped fiber laser with a simple linear cavity based on a fiber Bragg grating Fabry-Perot filter (FBG-FPF) and a narrowband (similar to 0.06 nm) FBG is proposed and demonstrated experimentally. Two uniform FBGs form the FBG-FPF, which has two ultranarrow transmission bands with a bandwidth of 0.12 pm and a wavelength spacing of 0.095 nm. By slightly tuning the central wavelength of the narrowband FBG, SLM lasing at 1549.658 or 1549.563 nm (corresponding to the two transmission peaks of the FBG-FPF) is achieved with a laser output power of similar to 4 mW, when the pump power is similar to 75 mW.

  • 5.
    Fakhar-e-Alam, M.
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Kishwar, S.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Khan, Y.
    Pakistan Institute for Engineering and Applied Science.
    Siddique, M.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Atif, M.
    Pakistan Institute for Engineering and Applied Science.
    Nur, Omer
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Willander, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Tumoricidal Effects of Nanomaterials in HeLa Cell Line2011Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 21, nr 11, s. 1978-1988Artikkel i tidsskrift (Fagfellevurdert)
    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).

  • 6.
    Fakhar-e-Alam, M
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan. Pakistan Institute of Engineering and Applied Sciences, Pakistan.
    Usman Ali, Syed
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan. , NED University of Engineering and Technology, Pakistan.
    Hussain Ibupoto, Zafar
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
    Atif, M
    Pakistan Institute of Engineering and Applied Sciences, Pakistan;Physics and Astronomy Department, College of Science, King Saud University, Saudi Arabia.
    Willander, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
    Erratum: “Phototoxic effects of zinc oxide nanowires (ZnO NWs) complexed with 5-ALA in RD cell line” (Laser Physics 21, 2165 (2011))2012Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 22, nr 2, s. 476-476Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    n/a

  • 7.
    Fakhar-e-Alam, M.
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Usman Ali, Syed
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Hussain Ibupoto, Zafar
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Atif, M.
    Pakistan Institute for Engineering and Applied Science.
    Willander, Magnus
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Phototoxic effects of zinc oxide nanowires (ZnO NWs) complexed with 5-ALA in RD cell line2011Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 21, nr 12, s. 2165-2170Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 8.
    Fakhar-e-Alam, M
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan. Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad, Pakistan.
    Usman Ali, Syed
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan. Department of Electronic Engineering, NED University of Engineering and Technology, Karachi, Pakistan.
    Ibupoto, Zafar Hussain
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
    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
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
    Erratum: “Phototoxic Effects of Zinc Oxide Nanowires (ZnO NWs) Complexed with 5-ALA in RD Cell Line” (Laser Physics 21, 2165 (2011))2012Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 22, nr 1, s. 338-338Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    n/a

  • 9. Fort, C.
    et al.
    Cataliotto, F.S.
    Catani, J.
    De Sarlo, L.
    Fallani, L.
    Lye, J.E.
    Modugno, M.
    Saers, Robert
    Umeå universitet, Teknisk-naturvetenskaplig fakultet, Fysik.
    Inguscio, M.
    Bloch matter waves dynamics and its breakdown: a Bose-Einstein condensate in a moving 1D optical lattice2005Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 15, nr 3, s. 447-453Artikkel i tidsskrift (Fagfellevurdert)
  • 10. Hellstrom, J. E.
    et al.
    Pasiskevicius, V.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Denker, B.
    Galagan, B.
    Ivleva, L.
    Sverchkov, S.
    Voronina, I.
    Horvath, V.
    Laser performance of Yb: GdCa4O(BO3)(3) compared to Yb : KGd(WO4)(2) under diode-bar pumping2007Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 17, nr 10, s. 1204-1208Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A study of Yb:GdCOB under diode-bar pumping has been performed and the results are compared, experimentally and theoretically, with Yb:KGW in the same cavity. An output power of 7.3 W and a slope efficiency of 57.4% were obtained. Self-frequency-doubling experiments are also discussed.

  • 11.
    Khrennikov, Andrei
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Matematiska och systemtekniska institutionen.
    Bell’s inequality, Einstein, Podolsky, Rosenarguments and von Neumann’s projection postulate2009Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 19, nr 1, s. 346-356Artikkel i tidsskrift (Fagfellevurdert)
  • 12.
    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
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för teknik och naturvetenskap.
    The two-dimensional superconducting photonic crystal2007Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 17, nr 9, s. 1183-1186Artikkel i tidsskrift (Fagfellevurdert)
    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".

  • 13.
    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 spectroscopy2002Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 12, nr 4, s. 802-811Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 14.
    Mohamed, Tarek
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Beni Suef University, Egypt.
    Andler, Guillermo
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    Schuch, Reinhold
    Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
    A seeded dye laser cavity for intracavity experiments2015Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 25, nr 9, artikkel-id 095801Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A seeded dye laser cavity, synchronously pumped by the 2nd harmonic of the Nd:YAG laser has been designed and experimentally tested. The used seed signal was the well defined narrow linewidth output laser signal (Delta lambda = 0.013 nm) from the excimer-dye laser system. Energy considerations showed that the intracavity laser energy, that can be used for an experimental section inside the cavity, can reach an efficiency of 20% of the pumping energy. The wavelength and linewidth are fully controlled by the wavelength and linewidth of the seeding laser.

  • 15. Naveed, H. B.
    et al.
    Popov, Sergei
    KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Optik och Fotonik, OFO.
    Shafique, M.
    Model microcavity laser with CdSe/CdS quantum dots as lasing media2016Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 26, nr 2, artikkel-id 025004Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A model is established for a microcavity laser with cadmium selenium/cadmium sulfide (CdSe/CdS) core/shell quantum dots (QDs) as a lasing medium, The research was organised to develop and solve the rate equations for the above mentioned microcavity laser to calculate the output parameters during lasing. Using time-resolved fluorescence spectroscopy, the radiative life time of the lasing medium was measured along with its fluorescence and absorption spectra. A model is also established on the basis of the segment contact method (SCM) to demonstrate the threshold gain profile using the absorption spectrum of CdSe/CdS core/shell type II QDs residing in the cavity. A laser cavity of size 1 mu m was pumped with an optical source (532 nm) to achieve an optimised laser peak at 470nm,

  • 16.
    Stenholm, Stig
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Topics in adiabaticity2005Inngår i: Laser physics, ISSN 1054-660X, E-ISSN 1555-6611, Vol. 15, nr 10, s. 1421-1427Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents the general framework for adiabatic time evolution. It discusses two cases where systematic sequences of approximations are possible: the time-dependent two-level system and the harmonic oscillator with drifting frequency. In the former case, the appearance of a level crossing leads to nonanalytic corrections not captured by the systematic expansion.

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