Browsing by Author "Alshammari, Talal"

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The practical application of 3D printers in the fabrication of a flexible heatsink for heat applications
(Keimyung University, 2024-02-15) Alshammari, Talal; Kim, Jonghyun
The innovative concept of converting solid thermal reducers into flexible counterparts has emerged as a captivating advancement in the realms of thermal management and material science. Flexible designs represent a dynamic and adaptable solution in the domain of thermal management. This study endeavors to concentrate on the meticulous design and manufacturing of high-performance heatsinks by using 3D printing with exceptional flexibility, specially tailored for effortless integration into collapsible electronic devices. The fabrication of heatsinks with varying ratios of Multi-Walled Carbon Nanotube (MWCNT) and Polydimethylsiloxane (PDMS) was conducted, and the optimal ratio was determined based on design elements (i.e., fin length, fin design, heat dissipation efficiency, tensile strength, flexibility, and bending moment analysis). The heatsink with 5% MWCNTs in PDMS displayed the optimal highest efficiency in heat dispersion. Bending and tension tests approved the excellent mechanical properties of the flexible heatsink. The effectiveness of the flexible heatsink based on MWCNT/PDMS has been proven experimentally to be wearable. These results reveal that the MWCNT/PDMS composite-based heatsink can be a good candidate in the thermal interface for the thermal management of electronic devices.
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TOWARDS TAMSELS: TAMM ASSISTED METASURFACE EMITTING LASERS
(University of Bristol, 2024-09) Alshammari, Talal; Harbourd. Edmund
Optical fibres girdle the earth: information securely travels around the world at the speed of light through optical fibres, supporting modern prosperity. However, this prosperity is at risk due to the "capacity crunch," which refers to the fundamental limitations on the amount of information that can be transmitted through optical fibres. The bottleneck arises from the conversion of electrical signals to optical signals, which restricts the speed at which information can be encoded. In order to overcome these challenges, we need new, compact, and efficient light sources that can be incorporated into photonic and electrical integrated circuits. These light sources should be able to operate at different wavelengths for WDM, various polarizations, and orbital angular momentum states. Our proposal involves the use of Tamm states, which are topologically protected optical states that can be formed at the surface of a semiconductor-distributed Bragg reflector and a thin (~10nm) metal layer. These states are topologically protected, and by using microscale patterning of the metal, we can create single-mode zero-dimensional confined structures. These structures have already been used to demonstrate lasers and single photon sources at short (<1µm) wavelengths. Our project aims to advance Tamm technology to create innovative light sources using quantum wells. We plan to develop dual-wavelength LEDs and lasers that can operate in the C-band, enabling various photonics applications and all-optical switching. Additionally, we aim to extend the Tamm cavity to increase the gain. We will explore using GaAs/AlGaAs DBR in the Tamm to pave the way for an electrically pumped Tamm laser.
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