Essays about: "laser etching"

Showing result 1 - 5 of 8 essays containing the words laser etching.

  1. 1. Investigating Optical-Field-Induced Currents in GaN using Ultrafast Lasers

    University essay from Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

    Author : Vidar Flodgren; [2019]
    Keywords : GaN; gallium nitride; nanoscience; material science; ultrafast lasers; Yb Laser; Pharos Laser; titanium sapphire laser; device fabrication; lift-off; gold etching; optical-field-induced currents; modelling; matlab; Physics and Astronomy;

    Abstract : This study saw the development of an experimental setup capable of generating and measuring optical-field-induced currents in a variety of nanodevices fabricated specifically for this project. Each device design features two metallic contacts, closely separated by about 5 micrometers, deposited onto a semiconductor or insulator substrate. READ MORE

  3. 2. Study of ohmic contact formation on AlGaN/GaN heterostructures

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Kai-Hsin Wen; [2019]
    Keywords : ohmic contacts; wide bandgap; Ta-based; recess etch; N-vacancies;

    Abstract : It is challenging to achieve low-resistive ohmic contacts to III-nitride semiconductors due to their wide bandgap. A common way to reduce the contact resistance is to recess the ohmic area prior to metallization. READ MORE

  4. 3. Investigation of the heat transfer of enhanced additively manufactured minichannel heat exchangers

    University essay from KTH/Skolan för industriell teknik och management (ITM)

    Author : Hamidreza Rastan; [2019]
    Keywords : Minichannel; Microchannel; Heat exchanger; Additive manufacturing; 3D printing; Numerical simulation; CFD; Comsol;

    Abstract : Mini-/microchannel components have received attention over the past few decades owing to their compactness and superior thermal performance. Microchannel heat sinks are typically manufactured through traditional manufacturing practices (milling and sawing, electrodischarge machining, and water jet cutting) by changing their components to work in microscale environments or microfabrication techniques (etching and lost wax molding), which have emerged from the semiconductor industry. READ MORE

  5. 4. Effect of oxygen concentration in build chamber during laser metal deposition of Ti-64 wire

    University essay from KTH/Materialvetenskap

    Author : Eyvind Engblom; [2018]
    Keywords : additive manufacturing; laser metal deposition; alpha-case; titanium; wire;

    Abstract : Additive manufacturing of titanium and other metals is a rapidly growing field that could potentially improve component manufacturing through optimization of geometries, less material waste and fewer process steps. Although powder-based additive manufacturing processes have so far been predominant, methods using a wire as feedstock has gained popularity due to faster deposition rates and lower porosity in deposited material. READ MORE

  6. 5. Ablation of Si with femtosecond laser

    University essay from KTH/Skolan för elektro- och systemteknik (EES)

    Author : Stefano Prevosti; [2016]
    Keywords : ;

    Abstract : Femtosecond laser ablation of different materials is becoming more and more important in micro- and nanomachining fields. The cutting precision and cost-effectiveness related to this method are turning it into a valid alternative to traditional methods. READ MORE