Researcher:
Khan, Imran

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Master Student

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Imran

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Khan

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Khan, Imran

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2015 - 20183

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Researcher Of Publications: search.filters.isAuthorOfPublication.3ce1e570-904a-4096-9784-fea8b9c812ff

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    Far-infrared elastic scattering proposal for the Avogadro Project's silicon spheres
    (Elsevier, 2018) Department of Physics; N/A; N/A; N/A; N/A; N/A; N/A; Serpengüzel, Ali; Humayun, Muhammad Hamza; Khan, Imran; Azeem, Farhan; Chaudhry, Muhammad Rehan; Gökay, Ulaş Sabahattin; Murib, Mohammed Sharif; Faculty Member; Researcher; Master Student; Researcher; Researcher; PhD Student; Researcher; Department of Physics; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; Graduate School of Sciences and Engineering; College of Sciences; 27855; N/A; N/A; N/A; N/A; N/A; N/A
    Avogadro constant determines the number of particles in one mole of a substance, thus relating the molar mass of the substance to the mass of this substance. Avogadro constant is related to Systeme Internationale base units by defining the very concept of chemical quantity. Revisions of the base units created a need to redefine the Avogadro constant, where a collaborative work called the Avogadro Project is established to employ optical interferometry to measure the diameter of high quality 100 mm silicon spheres. We propose far-infrared spectroscopy for determining the Avogadro constant by using elastic scattering from the 100 mm Avogadro Project silicon spheres. Similar spectroscopic methods are already in use in the near-infrared, relating whispering gallery modes of the 1 mm silicon spheres to the diameter of the spheres. We present numerical simulations in the far-infrared and the near-infrared, as well as spatially scaled down elastic scattering measurements in the near-infrared. These numerical and experimental results show that, the diameter measurements of 100 mm single crystal silicon spheres with elastic scattering in the far-infrared can be considered as an alternative to optical interferometry.
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    Silicon microspheres in metrology
    (Electromagnetics Academy, 2015) N/A; N/A; N/A; N/A; N/A; Department of Physics; Humayun, Muhammad Hamza; Azeem, Farhan; Khan, Imran; Gökay, Ulaş Sabahattin; Serpengüzel, Ali; Master Student; Master Student; Master Student; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; N/A; N/A; 27855
    The Système International unit of mass is the kilogram. The present definition of the kg is based on a prototype dating back to 1880s. New approaches to define the unit of mass are being investigated. Avogadro Project uses 10 cm diameter single crystal silicon spheres. The technique commonly observed to measure the radius of the silicon sphere is optical interferometry. Here, we propose an alternate method of measuring the diameter of the single crystal silicon sphere using near-infrared spectroscopy. We demonstrate our approach by numerically simulating the electromagnetic coupling of a silicon microdisk of radius 5 µm to an optical waveguide of width 0.5 µm, thereby approximating the coupling of a microsphere to a rectangular optical waveguide. It might be possible to have a precise technique for determining the radius of the sphere, which can be used for the definition of the kilogram.
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    Simulation of elastic scattering from a germanium microsphere in the near-ir
    (IEEE, 2016) N/A; N/A; Department of Physics; Çirkinoğlu, Hüseyin Ozan; Khan, Imran; Serpengüzel, Ali; Master Student; Master Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; N/A; N/A; 27855
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