A5033853667- Semiconductor Lasers and Optical Devices
- GaN-based semiconductor devices and materials
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Optical Wireless Communication Technologies
- Ga2O3 and related materials
- ZnO doping and properties
- Underwater Vehicles and Communication Systems
- Perovskite Materials and Applications
- Nanowire Synthesis and Applications
- Advanced Fiber Optic Sensors
- Semiconductor materials and devices
- Advanced Photocatalysis Techniques
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Metal and Thin Film Mechanics
- Photonic Crystals and Applications
- Water Quality Monitoring Technologies
- Quantum Dots Synthesis And Properties
- Organic Light-Emitting Diodes Research
- Spectroscopy and Laser Applications
- Thermal Radiation and Cooling Technologies
- Chalcogenide Semiconductor Thin Films
King Abdullah University of Science and Technology
2016-2025
Photonics (United States)
2017-2023
University of Science and Technology
2020-2022
Korea University of Science and Technology
2022
ORCID
2020
Institute of Electrical and Electronics Engineers
2020
King Fahd University of Petroleum and Minerals
2019
McGill University
2019
Universiti Sains Malaysia
2017
Universiti Teknologi Petronas
2016
We demonstrate ultra-air- and photostable CsPbBr3 quantum dots (QDs) by using an inorganic-organic hybrid ion pair as the capping ligand. This passivation approach to perovskite QDs yields high photoluminescence yield with unprecedented operational stability in ambient conditions (60 ± 5% lab humidity) pump fluences, thus overcoming one of greatest challenges impeding development perovskite-based applications. Due robustness passivated QDs, we were able induce ultrastable amplified...
We experimentally demonstrate an underwater wireless optical communications (UWOC) employing 450-nm TO-9 packaged and fiber-pigtailed laser diode (LD) directly encoded with orthogonal frequency division multiplexed quadrature amplitude modulation (QAM-OFDM) data. A record data rate of up to 4.8 Gbit/s over 5.4-m transmission distance is achieved. By encoding the full 1.2-GHz bandwidth LD a 16-QAM-OFDM data, error vector magnitude (EVM) 16.5%, signal-to-noise ratio (SNR) 15.63 dB bit (BER)...
The video streaming, data transmission, and remote control in underwater call for high speed (Gbps) communication link with a long channel length (~10 meters). We present compact low power consumption wireless optical (UWOC) system utilizing 450-nm laser diode (LD) Si avalanche photodetector. With the LD operating at driving current of 80 mA an 51.3 mW, we demonstrated high-speed UWOC offering rate up to 2 Gbps over 12-meter-long, 1.5 record 20-meter-long channel. measured bit-error (BER)...
Unintentional self-doping in semiconductors through shallow defects is detrimental to optoelectronic device performance. It adversely affects junction properties and it introduces electronic noise. This especially acute for solution-processed semiconductors, including hybrid perovskites, which are usually high due rapid crystallization. Here, we uncover extremely low concentrations single crystals of the two-dimensional perovskites (C6H5C2H4NH3)2PbI4·(CH3NH3PbI3)n−1 (n = 1, 2, 3), over three...
Optical wireless communication (OWC) using the ultra-broad spectrum of visible-to-ultraviolet (UV) wavelength region remains a vital field research for mitigating saturated bandwidth radio-frequency (RF) communication. However, lack an efficient UV photodetection methodology hinders development UV-based The key technological impediment is related to low UV-photon absorption in existing silicon photodetectors, which offer low-cost and mature platforms. To address this technology gap, we...
Visible light communication (VLC) is an emerging technology that uses light-emitting diodes (LEDs) or laser for simultaneous illumination and data communication. This envisioned to be a major part of the solution current bottlenecks in wireless However, conventional lighting phosphors are typically integrated with LEDs have limited modulation bandwidth thus cannot provide required realize potential VLC. In this work, we present promising converter VLC by designing solution-processed CsPbBr3...
A unified statistical model is proposed to characterize turbulence-induced fading in underwater wireless optical communication (UWOC) channels the presence of air bubbles and temperature gradient for fresh salty waters, based on experimental data. In this model, channel irradiance fluctuations are characterized by mixture exponential-generalized gamma (EGG) distribution. We use expectation-maximization algorithm obtain maximum likelihood parameter estimation new model. Interestingly, shown...
We experimentally demonstrate a record high-speed underwater wireless optical communication (UWOC) over 7 m distance using on-off keying non-return-to-zero (OOK-NRZ) modulation scheme. The link uses commercial TO-9 packaged pigtailed 520 nm laser diode (LD) with 1.2 GHz bandwidth as the transmitter and an avalanche photodiode (APD) module receiver. At 2.3 Gbit/s transmission, measured bit error rate of received data is 2.23×10(-4), well below forward correction (FEC) threshold 2×10(-3)...
With the ever-increasing demand for data and radio frequency spectrum becoming congested, free space optics (FSO) may find a niche situations where fiber is too expensive or difficult to install. FSO cross-disciplinary field that draws from communication, astronomy, even quantum optics, it has seen major advances over last three decades. In this tutorial-style review, we provide broad overview of many important topics required design, develop, research next generation technology.
Time, polarization, and wavelength multiplexing schemes have been used to satisfy the growing need of transmission capacity. Using space as a new dimension for communication systems has recently suggested versatile technique address future bandwidth issues. We review potentials harnessing an additional degree freedom applications including free optics, optical fiber installation, underwater wireless links, on-chip interconnects, data center indoor connections, radio frequency, acoustic...
Hydrogen production via photoelectrochemical water-splitting is a key source of clean and sustainable energy. The use one-dimensional nanostructures as photoelectrodes desirable for applications due to the ultralarge surface areas, lateral carrier extraction schemes, superior light-harvesting capabilities. However, unavoidable states nanostructured materials create additional charge trapping centers energy barriers at semiconductor-electrolyte interface, which severely reduce...
Energy-saving photodetectors are the key components in future photonic systems. Particularly, self-powered photoelectrochemical-type (PEC–PDs), which depart completely from classical solid-state junction device, have lately intrigued intensive interest to meet next-generation power-independent and environment-sensitive photodetection. Herein, we construct, for first time, solar-blind PEC PDs based on self-assembled AlGaN nanostructures silicon. Importantly, with proper surface platinum (Pt)...
Abstract High‐quality epitaxy consisting of Al 1− x Ga N/Al y N multiple quantum wells (MQWs) with sharp interfaces and emitting at ≈280 nm is successfully grown on sapphire a misorientation angle as large 4°. Wavy MQWs are observed due to step bunching formed the edges. A thicker QW width accompanied by greater accumulation gallium near macrostep edge than that flat‐terrace 4° misoriented sapphire, leading generation potential minima respect their neighboring QWs. Consequently,...
A radiative vapor condenser sheds heat in the form of infrared radiation and cools itself to below ambient air temperature produce liquid water from vapor. This effect has been known for centuries, is exploited by some insects survive dry deserts. Humans have also using condensation dew collection. However, all existing condensers must operate during nighttime. Here, we develop daytime that continue 24 h a day. These can under direct sunlight, without active consumption energy. Combined with...
Radiative cooling is an emerging technology that can passively release heat to the environment. To obtain a subambient effect during daytime, chemically engineered structural materials are widely explored simultaneously reject sunlight and preserve strong thermal emission. However, many previously reported fabrication processes involve hazardous chemicals, which hinder material's ability be mass produced. In order eliminate chemicals used in of previous works, this article reports white...
Water covers 71% of the Earth's surface, where steady increase in oceanic activities has promoted need for reliable maritime communication technologies. The existing systems involve terrestrial, aerial, and space networks. This article presents a holistic overview different forms communications provides latest advances various marine first introduces techniques used over radio frequency (RF) optical bands. Then, we present channel models RF bands, modulation coding schemes, coverage...
The p-n junction with bipolar characteristics sets the fundamental unit to build electronics while its unique rectification behavior constrains degree of carrier tunability for expanded functionalities. Herein, a bipolar-junction photoelectrode employed gallium nitride (GaN) homojunction nanowire array that operates in electrolyte is reported, demonstrating photoresponse controlled by different wavelengths light. Significantly, rational decoration ruthenium oxides (RuOx ) layer on nanowires...
An advanced light-fidelity (Li-Fi) system based on the blue Gallium nitride (GaN) laser diode (LD) with a compact white-light phosphorous diffuser is demonstrated for fusing indoor white-lighting and visible light communication (VLC). The adhered GaN LD broadens luminescent spectrum diverges beam spot to provide ample functionality including completeness of Li-Fi feature quality white-lighting. diverged covers radiant angle up 120(o) CIE coordinates (0.34, 0.37). On other hand, degradation...
Hybrid perovskite crystals have emerged as an important class of semiconductors because their remarkable performance in optoelectronics devices. The interface structure and chemistry these are key determinants the device’s performance. Unfortunately, little is known about intrinsic properties surfaces materials extrinsic effects, such complex microstructures, processing conditions, hydration under ambient thought to cause resistive losses high leakage current solar cells. We reveal...
Paper is an excellent candidate to replace plastics as a substrate for flexible electronics due its low cost, renewability and flexibility. Cellulose nanopaper (CNP), new type of paper made nanosized cellulose fibers, promising material transparent electrodes potentially high transparency mechanical strength. Although CNP substrates can achieve transparency, they are still characterized by diffuse transmittance small direct transmittance, resulting in optical haze the substrates. In this...