Fa
  • Ph.D. (1989)

    Physics

    Physics Research Department, University of London, London, United Kingdom

  • M.Sc. (1985)

    Physics

    Physics, University of Kent at Canterbury, Canterbury, United Kingdom

  • B.Sc. (1980)

    Physics

    Department of Physics, Pars College, Tehran, I.R. of Iran

  • Fabrication, structural investigation, spectral and properties of crystals with nonlinear properties, solar cells, thin films, nanostructures and aerogels.
  • Experimental and theoretical spectroscopy: Spontaneous Raman, Surface enhanced Raman (SERS), plasmons and polaritons effets.
  • Research Area(s):

    Lab Assistant:

    Phone:

    Location:

  • Research field:

    Expert:

    Phone:

    Address:

Rasoul Malekfar received his BSc in Physics from Pars College, Tehran, Iran in 1980. After serving military service for two years, he started his M.Sc in Physics at School of Physics, the University of Kent at Canterbury, UK in 1983. In June 1985 he started his PhD. at Physics Research Department, Kings College, University of London under supervision of Professor W. F. Sherman and late Professor G. R. Wilkinson and did research on Laser Raman Scattering under extreme conditions of high pressures and low temperatures. After receiving his PhD in December 1989, he returned home and from February 1990 he is working at Atomic and Molecular Group, Physics Department, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, I.R. Iran and currently is a Professor of Physics.

Contact

Curriculum Vitae (CV)

A superconducting Fabry–Perot cavity for trapping cold molecules

T. Momose F.S. Tahsildaran F, M. Vashishta, A.H. Farahbod, R. Malekfar , P. Djuricanin, K. Enomoto
Journal PaperJournal of Physics B: Atomic, Molecular and Optical Physics , Volume 54 , Issue 1, 2021 January 21, {Pages 10510-1-10 }

Abstract

VUV photochemistry and nuclear spin conversion of water and water–orthohydrogen complexes in parahydrogen crystals at 4 K

T Momose FS Tahsildaran F, B Moore, T Bashiri, H Otani, P Djuricanin, R Malekfar, AH Farahbod
Journal PaperPhysical Chemistry Chemical Physics , Volume 23 , Issue 6, 2021 February 2, {Pages Advance Paper }

Abstract

Samples of H2O, HDO, and D2O were isolated in solid parahydrogen (pH2) matrices and irradiated by vacuum ultraviolet (VUV) radiation at 147 nm. Fourier-Transform Infrared (FTIR) spectra showed a clear depletion of D2O and an enrichment of both HDO and H2O by 147 nm irradiation. These irradiation-dependent changes are attributed to the production of OH and/or OD radicals through photodissociations of H2O, HDO, and D2O. The radicals subsequently react with the hydrogen matrix, leading to the observed enrichment of H2O. No trace of isolated OH or OD was detected in the FTIR spectra, indicating that the OH/OD radicals react with the surrounding matrix hydrogen molecules via quantum tunneling within our experimental timescale. The observed tempo

Wave packet shaping for a single photon source

Azadeh Ahmadian, Rasoul Malekfar
Journal PaperJournal of the Optical Society of America B , Volume 38 , Issue 3, 2021 January , {Pages pp. 783-791 }

Abstract

For the realization of a quantum network and efficient transfer of information between its nodes, many challenges should be resolved. One of these challenges is related to controlling photons, in that receiving and resending data in a real-time process should be reliable. The uncontrollable and time asymmetry shape of the photon wave packets emitted by quantum sources creates obstacles for reliable information transfer. In this work, an approach has been introduced to tune the wave packet shape of a single photon as a significant factor for absorbing and resending the same information. Since the wave packet of the photon emitted from spontaneous emission cannot be handled, in this research for the wave packet shaping, two lasers with a phas

Surface-Enhanced Raman Scattering of Methylene Blue on Titanium Nitride Nanoparticles Synthesized by Laser Ablation in Organic Solvents

Marzieh Esmaeilzadeh, Hossein Dizajghorbani-Aghdam, Rasoul Malekfar
Journal PaperSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2021 March 19, {Pages 119721 }

Abstract

Suspensions of titanium nitride (TiN) nanoparticles (NPs) were prepared using nanosecond Ce:Nd:YAG pulsed laser ablation (λ = 1064 nm) of a TiN target immersed in various solvents such as Toluene (C6H5CH3), Acetonitrile (CH3CN), and N, N-dimethylformamide (C3H7NO). The synthesized NPs were characterized by applying a range of spectroscopic, structural, and compositional analysis techniques. The obtained TiN NPs in N, N-dimethylformamide (DMF-TiN NPs) solvent showed strong optical absorption in the near-infrared (NIR) range; Whereas, the obtained TiN NPs in toluene (T-TiN NPs) and acetonitrile (AN-TiN NPs) solvents were covered with a carbon matrix layer that quenched their surface plasmon resonance (SPR). The carbon matrix on the NPs was r

Z-scan investigation to evaluate the third-order nonlinear optical properties of cauliflower-like VS2 structures

Marziyeh Parishani, Marzieh Nadafan, Rasoul Malekfar
Journal PaperJOSA B , Volume 38 , Issue 5, 2021 May 1, {Pages 1586-1592 }

Abstract

VS_2 was prepared via the hydrothermal method and changing the reaction time and employing surfactant. The microstructural characterizations show the control of sheet dimensions and growth of crystal planes. The Z-scan study demonstrates the positive nonlinear n_2 due to the self-focusing effect and the two-photon absorption for nonlinear absorption. These results imply the effect of lateral dimensions of sheets in cauliflower-like structures on nonlinear optical responses. Also, the nonlinear optical susceptibility χ^(3) is as high as 10^−10 (esu). This study shows that the VS_2 flower-like structure and its similar nanostructures are promising materials for nonlinear optical applications and further considerations.

Investigation of the Time Behavior of the Second-Order Coherence Function of a Tunable Single-Photon Source

A Ahmadian, R Malekfar
Journal Paper , , {Pages }

Abstract

Raman Spectroscopic Characterization of Hepatic Differentiation of Mesenchymal Stem Cells

S Arjmand, A Barzegar, A Mohammadpour, H Rezaei, N Davoodian, ...
Journal Paper , , {Pages }

Abstract

Synthesis and optical properties investigation of TiO2‎ nanotubes for use in polymer gel-state dye sensitized solar cells

Z Seidalilir, R Malekfar
Journal Paper , , {Pages }

Abstract

Investigation of Optical Properties of Silver Nanoparticle Contamination Effect on Titanium Dioxide Nanofibers

A Mobasheri, R Malekfar
Journal Paper , , {Pages }

Abstract

A novel approach to the synthesis of lanthanum aluminate nanoparticles using thermal shock assisted solid-state method as a microwave absorber layer,

M Beheshti, R Malekfar
Journal Paper , , {Pages }

Abstract

NiCo2O4-based nanostructured composites for high-performance pseudocapacitor electrodes

P Taboada M Eskandari, R Malekfar, D Buceta
Journal PaperColloids and Surfaces A , Volume 584 , 2020 January 2, {Pages 124039-1-09 }

Abstract

Core–Double-Shell Fe2O3@SiO2@Jarosite Hybrid Nanoparticles Synthesized by Laser Ablation of Turquoise in Ethanol

Mansoureh Jalili, Hajar Ghanbari, Rasoul Malekfar, Seyed Shayan Mousavi Masouleh
Journal PaperACS omega , Volume 5 , Issue 7, 2020 February 14, {Pages 3563-3570 }

Abstract

This work highlights a facile green route for the one-step synthesis of iron oxide core–double-shell nanoparticles (NPs) and aluminum phosphide (AlP) nanosheets by pulsed laser ablation of the mineral turquoise target from Nishapur in the presence of an ethanol solvent. High-resolution transmission electron microscopy, selected-area electron diffraction pattern, and field emission scanning electron microscopy (FESEM) in combination with energy-dispersive X-ray mapping revealed the formation of NPs with a typical core@double-shell structure in which crystalline α-Fe2O3 (iron oxide) formed the core, while SiO2 (quartz) and (K, H3O)Fe3(SO4)2(OH6) (jarosite) participated as the inner and outer shell, respectively. However, the application of

Detecting compressive strain by evaluation of Raman spectroscopy of the multiwall Carbon nanotubes/TiO2 nanocomposites

Marzieh Naddafan, Ammar Shaker Alattar, Zahra Dehghani, Rasoul Malekfar
Journal PaperInternational Journal of Nano Dimension , Volume 11 , Issue 2, 2020 April 1, {Pages 168-176 }

Abstract

Functionalized Multi-walled carbon nanotubes (f-MWCNTs) which are modified using nitric acid and sulfuric acid were evaluated to synthesize a uniform nanocomposite via application of TiO2. The f-MWCNTs-TiO2 nanocomposites have been produced via using the chemical simple two-step method. To characterize the structural analysis, scanning electron microscopy (SEM) imaging, ultraviolet-visible (UV-Vis) spectroscopy, and Raman spectroscopy were utilized. The maximum shift of D, G, and 2G-bands of f-MWCNTs were related to 20 wt. % f-MWCNTs in TiO2 nanoparticles. Moreover, an up-shift of 40 cm-1 was recorded for the MWCNTs (G’-band) for 5 wt. % f-MWCNTs. For 20 wt. % f-MWCNTs/TiO2 (G-band) nanocomposites, was determined by 4.7%. By increasing th

Optical and structural investigation of ZnS: Cu thin films synthesized by spray pyrolysis

Mohammad Reza Khanlary, Farnaz Alizade, Rasoul Malekfar
Journal PaperOptical and Quantum Electronics , Volume 52 , Issue 5, 2020 April 24, {Pages }

Abstract

We have investigated the effect of Cu dopant and substrate temperature on the structural and optical properties of ZnS thin films deposited on glass substrate by spray pyrolysis technique. The glass substrate temperature varied from 300 to 450 C. Different characterization methods such as X-ray diffractometry, EDS, SEM, and Raman scattering analyses for studying the structural, morphological and optical properties of the prepared ZnS and ZnS: Cu samples were carried out. Improvement in crystallization, increase in crystallite size and also better growth orientation along the (111) direction are clearly evident due to the increase in the substrate temperature. Cu doping effects on the displacement of diffraction peaks towards larger angles a

Investigation of Optical Properties of Polycarbonate/TiO 2/ZnO Nanocomposite: Experimental and DFT Calculations

Mehdi Eskandari, Mehrdad Najafi Liavali, Rasoul Malekfar, Pablo Taboada
Journal PaperJournal of Inorganic and Organometallic Polymers and Materials , 2020 June 27, {Pages 10-Jan }

Abstract

In this study, nanocomposites films of polycarbonate/TiO 2/ZnO nanoparticles with various weight percentages (5 and 10 wt%) were prepared. X-ray diffraction and FTIR spectroscopy were utilized to investigate the structure of the samples. The morphologies of nanocomposites were studied by scanning electron microscopy (SEM). Optical properties of the samples were studied by Raman and UV–Vis spectroscopy. The band gaps of nanocomposites were estimated using the Tauc method. The band gap of nanocomposite decreased when the weight percentage of nanoparticles increased. The band gaps of PC/TiO 2, PC/ZnO and PC/TiO 2/ZnO nanocomposites calculated by Density-functional theory (DFT) method are 3.28, 3.37 and 3.3 eV, respectively.

Influence of the order of fabrication sequences on the thermoelectric properties of skutterudite CoSb3–Cu0. 6Ni0. 4 nanocomposites

Ahmad Gharleghi, Md Mobarak Hossain Polash, Rasoul Malekfar, Sima Aminorroaya Yamini, Daryoosh Vashaee
Journal PaperJournal of Alloys and Compounds , 2020 June 30, {Pages 156188 }

Abstract

Nanocomposite samples of CoSb3-xCu0.6Ni0.4 (x = 1, 3.5, 6, and 9 wt%) were fabricated through two different approaches to understand the influence of fabrication processes on the thermoelectric properties of CoSb3 skutterudite. CoSb3 matrix and Cu0.6Ni0.4 nanoalloy were synthesized separately via hydrothermal procedures. The mixtures of as-hydrothermally synthesized powders were prepared and annealed in the first method, while in the second fabrication route, CoSb3 powders were initially annealed, followed by mixing with Cu0.6Ni0.4 and annealing of the composite at the same conditions. The results showed improved electrical conductivity of CoSb3 compounds, which is consistent with the systematic increase of the carrier concentration u

Mechanical study and molecular dynamics simulation on polycarbonate nanocomposite with carbon black and SnO2

Mehdi Eskandari, Jaber Azizi, Rasoul Malekfar, Pablo Taboada
Journal PaperJournal of Polymer Research , Volume 27 , Issue 9, 2020 September , {Pages 08-Jan }

Abstract

In this work, SnO2 and carbon black (CB) nanoparticles (NPs) were used to improve the physical and mechanical properties of polycarbonate films (PC) for industrial applications. Raman spectroscopy proved the successful inclusion of the fillers within the polymeric-based nanocomposites, with a suitable dispersion without changes in the structure and morphology of PC as denoted by scanning electron microscopy (SEM) and X-ray diffraction (XRD). After doping of the PC-based nanocomposites with CB, SnO2 and CB/SnO2 NPs, both the polymer hardness and the elastic modulus of the composites were observed to increase, with the highest value achieved for PC/CB-doped ones. Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DTG)

Long-distance heat transfer between molecular systems through a hybrid plasmonic-photonic nanoresonator

S Mahmoud Ashrafi, R Malekfar, AR Bahrampour, Johannes Feist
Journal PaperarXiv preprint arXiv:2008.11973 , 2020 August 27, {Pages }

Abstract

We introduce a hybrid plasmonic-photonic cavity setup that can be used to induce and control long-distance heat transfer between molecular systems through optomechanical interactions. The structure consists of two separated plasmonic nanoantennas coupled to a dielectric cavity. The hybrid modes of this resonator can combine the large optomechanical coupling of the sub-wavelength plasmonic modes with the large quality factor and delocalized character of the cavity mode that extends over a large distance ( m). We show that this can lead to effective long-range heat transport between molecular vibrations that can be actively controlled through an external driving laser.

Long-distance heat transfer between molecular systems through a hybrid plasmonic-photonic nanoresonator

S Mahmoud Ashrafi, R Malekfar, AR Bahrampour, Johannes Feist
Journal PaperarXiv e-prints , 2020 August , {Pages arXiv: 2008.11973 }

Abstract

We introduce a hybrid plasmonic-photonic cavity setup that can be used to induce and control long-distance heat transfer between molecular systems through optomechanical interactions. The structure consists of two separated plasmonic nanoantennas coupled to a dielectric cavity. The hybrid modes of this resonator can combine the large optomechanical coupling of the sub-wavelength plasmonic modes with the large quality factor and delocalized character of the cavity mode that extends over a large distance ( m). We show that this can lead to effective long-range heat transport between molecular vibrations that can be actively controlled through an external driving laser.

Coupled quantum molecular cavity optomechanics with surface plasmon enhancement: comment

Seyed Mahmoud Ashrafi, Narjes Taghadomi, Alireza Bahrampour, Rasoul Malekfar
Journal PaperPhotonics Research , Volume 8 , Issue 11, 2020 November 1, {Pages 1783-1785 }

Abstract

We have found an incorrect formula to estimate the root mean square (rms) amplitude of the molecular vibration in the molecular optomechanics systems reported by J. Liu et?al. [Photon. Res.5, 450–456 (2017)PRHEIZ2327-912510.1364/PRJ.5.000450]. In contrast with common optomechanical systems, the equilibrium position for molecular optomechanics systems used in the letter cannot be achieved by the equipartition theorem. Here, we achieve the effective temperature of molecules and then provide a corrected formula for the estimation of the rms amplitude of molecular motion. Using defined effective temperature into our new formula, we show that the minimal measurable force is (F≈1.7?10^−14  N), which it is 1 order bigger than the result

Current Teaching

  • Ph.D.

    Laser Spectrometry II

Teaching History

  • Ph.D.

    Laser Spectrometry II

  • Ph.D.

    Nonlinear Optics I

  • MS.c.

    Optics and Laser Laboratory

  • 2019
    Asgari, Davood
    Plasmonic effects in core-shell nanoparticles (titanium nitride- zinc oxide) and its effect on the enhancement of Raman spectra of some transition metal oxides,
  • 2012
    Ahmadian, Azade
    Investigation of some optical impacts on single photon emitted from nano diamond
  • 2017
    Amjadi, Neda

Top

New

    no record found