Explanipedia

Innovation in Spinal Fusion Surgery Techniques; A Review of Current Advance and Future Directions Open

Aymen Nasreldin Abalkariem, Harsha Sai Krishna Gottimukkala, Mustak Shaikh, Ata Khalid · 2025

Spinal fusion surgery is a critical procedure used to treat various spinal disorders, including degenerative diseases, deformities, trauma, and tumors. Over the past few decades, advancements have been made to improve patient outcomes, red…

A low-cost miniature immunosensor for haemoglobin as a device for the future detection of gastrointestinal bleeding Open

Alper Demirhan, Iva Chianella, Samadhan B. Patil, Ata Khalid · 2024

A novel device was developed for the future detection of gastrointestinal bleeding.

747 Ten Year Outcomes After Surgical Fixation of Tibial Plateau Fractures Open

Ata Khalid, Christine Nelson, Matthew Howell, Onyedikachi Eseonu, James Doonan , et al. · 2023

Aim This study represents one of the largest clinical case series' evaluating long-term outcomes following surgical fixation of tibial plateau fractures over a 10-year follow-up. The primary aim is to evaluate the incidence of TKR and risk…

Investigation of High-Frequency Fine Structure in the Current Output of Shaped Contact Planar Gunn Diodes Open

A. Mindil, G. M. Dunn, Ata Khalid, C. H. Oxley · 2020

A novel gallium arsenide (GaAs) planar Gunn diode design with shaped anode and cathode contacts using Monte Carlo simulations has been shown to produce significantly higher frequency fine structure components in the output waveform than th…

Investigation of THz Frequency Shaped Anode Planar Gunn Diodes Operating in Delayed Mode Open

A. Mindil, G. M. Dunn, Ata Khalid, C. H. Oxley · 2020

A novel planar design of Gunn diode with a shaped anode contact, utilizing Monte Carlo simulations, has been shown to have produced 0.3 THz frequency current output when operated in delayed mode. Two novel anode designs are investigated he…

Resonant Tunneling Diode Terahertz Sources With up to 1 mW Output Power in the<i>J</i>-Band Open

Abdullah Al‐Khalidi, Khalid H. Alharbi, Jue Wang, Razvan Morariu, Liquan Wang , et al. · 2019

Terahertz (THz) oscillators based on resonant tunneling diodes (RTDs) have relatively low output power, tens to hundreds of microwatts. The conventional designs employ submicron-sized RTDs to reduce the device self-capacitance and, as a re…

Investigation of Contact Edge Effects in the Channel of Planar Gunn Diodes Open

A. Mindil, G. M. Dunn, Ata Khalid, C. H. Oxley · 2019

The effect of the edge of the channel on the operation of Planar Gunn diodes has been examined using Monte Carlo simulations. High fields at the corner of the anode contact are known to cause impact ionization and consequent electrolumines…

An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar gunn diode oscillator Open

Mohamed Ismaeel Maricar, Ata Khalid, G. Dunn, Steve Greedy, Dave Thomas , et al. · 2018

The planar Gunn diode offers the potential of microwave, milli‐metric and THz‐based oscillators, which can be fabricated as part of a microwave monolithic integrated circuit (mmic). The paper develops an electrical representation of an alu…

Monolithically Integrated InAsSb-Based nBnBn Heterostructure on GaAs for Infrared Detection Open

Chengzhi Xie, Vincenzo Pusino, Ata Khalid, Adam P. Craig, Andrew Marshall , et al. · 2018

High operating temperature i nfrared photo detectors with multi -color function that are capable of monolithic integration are of increasing importance in developing the next generation of mid -IR imag e sensors. Applications of these sens…

An electrical equivalent circuit to simulate the output power of an AlGaAs/GaAs planar Gunn diode Open

Mohamed Ismaeel Maricar, Ata Khalid, G. Dunn, Steve Greedy, David W. P. Thomas , et al. · 2018

The planar Gunn diode offers the potential of microwave, milli-metric and THz based oscillator which can be fabricated as part of a microwave monolithic integrated circuit (mmic). To-date the RF output power has been too low for many appli…

Single-chip, mid-infrared array for room temperature video rate imaging Open

Chengzhi Xie, Mohsin Aziz, Vincenzo Pusino, Ata Khalid, Matthew J. Steer , et al. · 2017

The need for energy efficiency and lower emissions from industrial plants and infrastructures is driving research into novel sensor technologies, especially those that allow observing and measuring greenhouse gases, such as CO2. CO2 emissi…

Multispectral mid-infrared light emitting diodes on a GaAs substrate Open

Mohsin Aziz, Chengzhi Xie, Vincenzo Pusino, Ata Khalid, Matthew J. Steer , et al. · 2017

We have designed, simulated, and experimentally demonstrated four-colour mid-infrared (mid-IR) Light Emitting Diodes (LEDs) integrated monolithically into a vertical structure on a semi-insulating GaAs substrate. In order to finely control…

A new monolithic approach for mid-IR focal plane arrays Open

Chengzhi Xie, Vincenzo Pusino, Ata Khalid, Mohsin Aziz, Matthew J. Steer , et al. · 2016

Antimonide-based photodetectors have recently been grown on a GaAs substrate by molecular beam epitaxy (MBE) and reported to have comparable performance to the devices grown on more expensive InSb and GaSb substrates. We demonstrated that …

Diced and grounded broadband bow‐tie antenna with tuning stub for resonant tunnelling diode terahertz oscillators Open

Khalid H. Alharbi, Ata Khalid, Afesomeh Ofiare, Jue Wang, Edward Wasige · 2016

Radiation from antennas integrated with indium phosphide (InP)‐based resonant tunnelling diode (RTD) oscillators is mainly through the substrate because of the effects of the large dielectric constant. Therefore, hemispherical lenses are u…

InSb Photodiodes for Monolithic Active Focal Plane Arrays on GaAs Substrates Open

Vincenzo Pusino, Chengzhi Xie, Ata Khalid, Matthew J. Steer, Marc Sorel , et al. · 2016

We describe the development and optical characterization of a planar medium infrared (mid-IR) InSb photodetector on a GaAs substrate technology, capable of integrating MESFETs, to demonstrate a new active pixel device architecture. Our res…

Development of InSb dry etch for mid-IR applications Open

Vincenzo Pusino, Chengzhi Xie, Ata Khalid, Iain Thayne, David R. S. Cumming · 2015

We present a new chlorine-free dry etching process which was used to successfully etch indium antimonide grown on gallium arsenide substrates while keeping the substrate temperature below 150 °C. By use of a reflowed photoresist mask a sid…

Extraction of second harmonic from an InP based planar Gunn diode using diamond resonator for milli-metric wave frequencies Open

Mohamed Ismaeel Maricar, Ata Khalid, David R. S. Cumming, C. H. Oxley · 2015

Planar Indium Gallium Arsenide (In0.57Ga0.47As) Gunn diode was fabricated on a semi-insulating indium phosphide substrate with on chip matching circuit to enable the extraction of second harmonic in millimeter and terahertz frequencies. Th…

Improving the quality factor of the coplanar waveguide resonator Open

Mohamed Ismaeel Maricar, Ata Khalid, David R. S. Cumming, Christopher H. Oxley · 2015

A novel method of introducing a notch at a point of high magnetic field in a coplanar \nwaveguide (cpw) radial and diamond stub resonator to increase the quality factor (Q) was \nanalysed. For comparison both radial and diamond shaped cpw …

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