Researcher:
Chaudhry, Muhammad Rehan

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PhD Student

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Muhammad Rehan

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Chaudhry

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Chaudhry, Muhammad Rehan

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2014 - 20205

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Researcher Of Publications: search.filters.isAuthorOfPublication.dd16fa10-6215-4173-a8b4-9d1c3e003c10

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Now showing 1 - 5 of 5
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    Elastic scattering from a sapphire microsphere in the THz region
    (Optica Publishing Group (formerly OSA), 2014) N/A; N/A; N/A; Department of Physics; Bukhari, Syed Sultan Shah; Chaudhry, Muhammad Rehan; Bayer, Mustafa Mert; Serpengüzel, Ali; PhD Student; PhD Student; Master Student; Faculty Member; Department of Physics; 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; 27855
    We analyze numerically TE and TM polarization 0° transmission and 90° elastic scattering from a sapphire microsphere with a radius of 2000 μm in terahertz region from 790 μm to 850 μm by utilizing generalized Lorenz-Mie theory.
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    Symmetric meandering distributed feedback structures for silicon photonic circuits
    (Ieee-Inst Electrical Electronics Engineers Inc, 2020) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Physics; Chaudhry, Muhammad Rehan; Zakwan, Muhammad; Onbaşlı, Mehmet Cengiz; Serpengüzel, Ali; PhD Student; PhD Student; Faculty Member; Faculty Member; Department of Electrical and Electronics Engineering; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Sciences; N/A; N/A; 258783; 27855
    Fano lineshapes and electro-magnetically induced transparency-like peaks in the transmittance of a transverse electric polarization silicon-on-insulator symmetric meandering distributed feedback photonic structure are demonstrated. The coupling constants at the five identical directional couplers are varied to obtain the desired spectral responses. The numerically simulated and experimentally measured transmittance spectra are in good agreement with each other. The numerically calculated and experimentally measured insertion loss for the symmetric meandering distributed feedback structure with directional coupler coupling length L-c = 10 mu m are respectively -5 dB and -17 dB, including the grating couplers. Fano lineshapes with mode splitting is observed at directional coupler coupling constant value C of 0.24. For coupling constant value of C similar to 0.78, electro-magnetically induced transparency-like peaks are observed, and spectrally adjusted by varying the directional coupler coupling length. Fano lineshapes show an extinction ratio of more than 26 dB and slope ratio of 368 dB/nm. Electro-magnetically induced transparency-like peaks show a quality-factor on the order of 5 x 10(4). The symmetric meandering distributed feedback structure shows promise for possible applications as an optical switch, and an optical filter in wavelength division multiplexing and data networks, as well as optical sensors in optical diagnostics, using silicon photonics.
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    Elastic scattering from germanium microspheres in the terahertz region
    (IEEE, 2016) N/A; N/A; Department of Physics; Bukhari, Syed Sultan Shah; Chaudhry, Muhammad Rehan; Serpengüzel, Ali; PhD Student; PhD 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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    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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    Electromagnetic simulation of coupled silicon and diamond microdisks and slab waveguides in the mid-infrared
    (Electromagnetics Academy, 2015) Uysallı, Yiğit; Kurt, Adnan; N/A; N/A; N/A; Department of Physics; Chaudhry, Muhammad Rehan; Rashid, Muhammed Zeeshan; Gökay, Ulaş Sabahattin; Serpengüzel, Ali; PhD Student; PhD 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; College of Sciences; N/A; N/A; N/A; 27855
    Electromagnetic numerical studies of silicon and diamond microdisks coupled with silicon and diamond slab waveguides are performed in the CO2 laser emission region in the mid-infrared. Microdisk is the 2D analog of the microsphere and the slab waveguide is the 2D analog of the rectangular optical waveguide. The evanescent coupling between the waveguide and the microdisk results in efficient pumping of the whispering gallery modes of the microdisk. On-resonant and off-resonant studies are performed by tuning the laser wavelength to the microdisk whispering gallery modes.