Browsing USN Open Archive by Author "Akram, Muhammad Nadeem"
Now showing items 1-20 of 21
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Analysis of an Approximated Model for the Depletion Region Width of Planar Junctionless Transistors
Nowbahari, Arian; Roy, Avisek; Akram, Muhammad Nadeem; Marchetti, Luca (Peer reviewed; Journal article, 2019)In this paper, we investigate the accuracy of the approximated analytical model currently utilized, by many researchers, to describe the depletion region width in planar junctionless transistors (PJLT). The proposed analysis ... -
Design of Silicon Cap for Hermetic Packaging of Microbolometer Focal Plane Arrays
Xia, Hexin; Akram, Muhammad Nadeem; Roy, Avisek; Bardalen, Eivind; Nguyen, Hoang Vu; Hoivik, Nils; Aasmundtveit, Knut Eilif; Ohlckers, Per (Peer reviewed; Journal article, 2021)A microbolometer array is used as a detector in an infrared camera. It converts the temperature change induced by the incoming longwave infrared light into an electrical signal for obtaining the thermal image information. ... -
The effects of source resolution on resolution enhancement through shifted superimposition projection
Hansen, Svein Arne Jervell; Hardeberg, Jon Yngve; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2020)Resolution in a projected display is traditionally defined by the number of pixels in the projector's spatial light modulator (SLM). In recent years, different techniques that increase the resolution on the screen above ... -
Emmetropia Is Maintained Despite Continued Eye Growth From 16 to 18 Years of Age
Hagen, Lene Aarvelta; Gilson, Stuart; Akram, Muhammad Nadeem; Baraas, Rigmor C. (Journal article; Peer reviewed, 2019)PURPOSE. To examine, in Norwegian adolescents, to what degree emmetropia and low hyperopia were maintained from 16 to 18 years of age, and if this was the case, whether it was associated with continued coordinated ocular ... -
Evaluation of Silicon Diaphragms for Hermetic Packaging of Microbolometer Arrays
Xia, Hexin; Akram, Muhammad Nadeem; Bardalen, Eivind; Roy, Avisek; Aasmundtveit, Knut; Øhlckers, Per (Chapter, 2020)Hermetic packaging is a critical requirement for microbolometers to maintain long-term reliability. A thinner diaphragm is desirable for vacuum packaging of microbolometers to obtain higher infrared light transmission. ... -
Fourier ptychography algorithm based on scaled Fourier transform
Hasanzade, Mojde; Hussain, Nazabat; Breiby, Dag Werner; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2021)This letter discusses an alternative Fourier ptychography algorithm based on the scaled fast Fourier transform propagation. The advantage of this scheme is that it enables a zoom-in capability of the object spectrum and ... -
High-resolution Fourier Ptychography Microscopy using ultra-violet light and infrared light
Duong Gia, Huy (Master thesis, 2023)This thesis focuses on implementing the Fourier Ptychography Microscopy (FPM) technique using Ultra-violet (UV) and infrared (IR) light. In this report, the introduction provides a brief overview of FPM, its history, ... -
High-resolution polarization-sensitive Fourier ptychography microscopy using a high numerical aperture dome illuminator
Gholamimayani, Mahdieh; Tekseth, Kim Robert Bjørk; Breiby, Dag Werner; Klein, Joern; Akram, Muhammad Nadeem (Journal article; Peer reviewed, 2022)Polarization-sensitive Fourier-ptychography microscopy (pFPM) allows for high resolution imaging while maintaining a large field of view, and without mechanical movements of optical-setup components. In contrast to ordinary ... -
High-Speed Pulsation of a Cryogenically Operable Bipolar Photodiode Module for the Josephson Arbitrary Waveform Synthesizer
Karlsen, Bjørnar; Bardalen, Eivind; Nissilä, Jaani; Fordell, Thomas; Kieler, Oliver; Palafox, Luis; Behr, Ralf; Malmbekk, Helge; Akram, Muhammad Nadeem; Øhlckers, Per (Peer reviewed; Journal article, 2020)This paper describes the development and testing of a prototype of a cryogenically operable bipolar photodiode module. Optical pulsation systems based on both a Mach-Zehnder modulator and a mode-locked laser have been used ... -
Improved resolution Fourier ptychography scheme using oil-filled dome-shaped LED array
Mayani, Mahdieh Gholami; Hussain, Nazabat; Breiby, Dag Werner; Akram, Muhammad Nadeem (Peer reviewed; Journal article, 2022)Utilising angular-varied illumination in Fourier Ptychography, the resolution of optical microscopes can be increased and the phase of the sample can also be recovered while maintaining a wide field-of-view. In this work, ... -
Interconnected Crosslinked Carbon Nanotubes as Blackbody Emissive and Transmissive Films
Alsaleh, Bothayna Ahmad (Master thesis, 2024)This study invistagats the applications of interconnected crosslinked carbon nanotubes (iCLCNT) films on silicon substrate to offer efficient infrared (IR) emission as black body behavior for applications such as IR sensors. ... -
Modeling framework for piezoelectrically actuated MEMS tunable lenses
Abdelmeguid, Mahmoud Ahmed Farghaly; Akram, Muhammad Nadeem; Halvorsen, Einar (Peer reviewed; Journal article, 2016)We report a modeling framework for evaluating the performance of piezoelectrically actuated MEMS tunable lenses. It models the static opto-electromechanical coupling for symmetric configurations of piezoelectric actuators ... -
Optical performance of piezoelectrically actuated MEMS tunable lenses with various pupil geometries
Abdelmeguid, Mahmoud Ahmed Farghaly; Akram, Muhammad Nadeem; Halvorsen, Einar (Journal article; Peer reviewed, 2017)Abstract. A square geometry for the diaphragm of microelectromechanical systems (MEMS) tunable lenses with circular pupils is often used. This square diaphragm introduces aberrations that would not be present for a circular ... -
Optisk gyroskop konsept ved bruk av koblet resonator optisk bølgeleder: simulering og fabrikasjon
Grønvold, Fredrik Sommerfelt (Master thesis, 2020)Koblede koblede resonator optiske bølgeledere (CROW) har vist stort potensial som optiske gyroskoper, og oppnår følsomhet for ytelsen til navigasjonsgrad. Imidlertid er de bare overlegne over enkle ring resonatorer når ... -
Reliable Packaging and Development of Photodiode Module for Operation at 4 K
Bardalen, Eivind (Doctoral dissertations at the University of South-Eastern Norway;5, Doctoral thesis, 2018)AC voltage standards based on pulse-driven Josephson junction arrays, operated at 4 K, enable quantum-accurate generation of arbitrary voltage waveforms. These devices are operated by biasing the arrays with high-frequency ... -
Simulated effects of wet-etched induced surface roughness on IR transmission and reflection
Papatzacos, Phillip; Akram, Muhammad Nadeem; Bardalen, Eivind; Øhlckers, Per (Chapter, 2020)We have constructed a finite element simulation where we investigate the effects of wet-etch-induced surface roughness on transmission and reflection of infrared light in the 8-12um band. A silicon wafer was wet-etched for ... -
Simulation and microfabrication of MEMS vacuum electronic devices for terahertz technology
Billa, Laxma Reddy (Doctoral dissertations at the University of South-Eastern Norway;49, Doctoral thesis, 2019)Numerous applications explore the scarcely used terahertz (THz) band in the electromagnetic spectrum. However, widespread utilization of the THz band is technically challenging, due to the lack of power sources. The power ... -
Solar-driven plasmonic heterostructure Ti/TiO2−x with gradient doping for sustainable plasmon-enhanced catalysis
Cheng, Chaoqun; Akram, Muhammad Nadeem; Nilsen, Ola; Pryds, Nini; Wang, Kaiying (Journal article; Peer reviewed, 2020)Plasmon-enhanced harvesting of photons has contributed to the photochemical conversion and storage of solar energy. However, high dependence on noble metals and weak coupling in heterostructures constrain the progress ... -
Study of plasmonics induced optical absorption enhancement of Au embedded in titanium dioxide nanohole arrays
Zhao, Ying; Høivik, Nils Deneke; Akram, Muhammad Nadeem; Wang, Kaiying (Journal article; Peer reviewed, 2017)The light absorbing performance of titanium dioxide (TiO2) nanohole arrays partially filled with metallic gold is investigated using analytical methods. As a plasmonic generation element on one-dimensional (1D) TiO2, the ... -
Trial functions for reduced-order models of piezoelectrically actuated microelectromechanical systems tunable lenses
Farghaly, Mahmoud A.; Hanke, Ulrik; Akram, Muhammad Nadeem; Halvorsen, Einar (Journal article; Peer reviewed, 2018)Piezoelectrically actuated microelectromechanical systems (MEMS) lens structures can be composed of a clamped square elastic diaphragm partially covered with a thin piezoelectric film leaving a circular transparent region ...