Tapani Alasaarela, M.Sc., is the first person to examine the waveguiding properties of titanium dioxide atomic layer deposited in a low (120 °C) temperature and the application of the method in the improvement of silicon channel waveguides. Titanium dioxide is more commonly used in particle form, as white colour pigment (in paints) and as UV shield (in cosmetics). Alasaarela will defend his dissertation at Aalto University School of Electrical Engineering on 29 June 2011. Aged 23, he is the youngest person to receive a doctoral degree at Aalto University.
Good waveguiding properties (low losses and a high refractive index) and a low deposition temperature may also allow titanium dioxide to be used for producing channel waveguides on processed silicon chips. Titanium dioxide that is atomic-layer deposited in low temperatures will probably also have other optical applications, including optical biosensors developed for medical measurements.
In his dissertation, Alasaarela focuses on the fabrication and improvement of waveguides, which are an essential part of optical interconnects i.e. optical data transfer inside and between chips. Waveguides, or light-conducting structures, are an essential part of optical data transfer and processing. Nanoscale light channels can be used as waveguides on microchips. These channels are like miniaturised (one thousandth of the thickness of human hair) optical fibres integrated in a circuit. Circuit-integrated waveguides can be manufactured using such materials as silicon used for electronic components or other compatible materials.
In microprocessors used today, the electronic communication between different parts of the microchip is conducted over copper wires. Likewise, the information between the circuits on the motherboard is relayed electronically via copper wires. As processors become faster and computers have an increasing number of processor cores, one factor restricting computer speed is the data-transfer capacity of copper conductors. This limitation can be overcome by introducing optical data transfer inside and between chips. Even though optical fibres have been used in long-distance telecommunications for many years, the development of miniature-sized optical connections inside chips is only at its initial stages.
Tapani Alasaarela completed his matriculation examination at Oulun Lyseo Upper Secondary School in 2005. He graduated as Bachelor of Science (Technology) at the Helsinki University of Technology in January 2007 and as Master of Science at Imperial College London in 2008.
The public examination of Tapani Alasaarela’s dissertation “Atomic layer deposited titanium dioxide in optical waveguiding applications” will take place on Wednesday 29 June at 12 noon at Aalto University School of Electrical Engineering (lecture hall AS1 of the TUAS building) at Otaniementie 17, Espoo.
Doctor Laurent Vivien from L'Université Paris-Sud in France will act as the opponent and Professor Seppo Honkanen from Aalto University Department of Micro- and Nanosciences as the custos.
Contacts and sources:
Tapani Alasaarela
Aalto University
Good waveguiding properties (low losses and a high refractive index) and a low deposition temperature may also allow titanium dioxide to be used for producing channel waveguides on processed silicon chips. Titanium dioxide that is atomic-layer deposited in low temperatures will probably also have other optical applications, including optical biosensors developed for medical measurements.
In his dissertation, Alasaarela focuses on the fabrication and improvement of waveguides, which are an essential part of optical interconnects i.e. optical data transfer inside and between chips. Waveguides, or light-conducting structures, are an essential part of optical data transfer and processing. Nanoscale light channels can be used as waveguides on microchips. These channels are like miniaturised (one thousandth of the thickness of human hair) optical fibres integrated in a circuit. Circuit-integrated waveguides can be manufactured using such materials as silicon used for electronic components or other compatible materials.
In microprocessors used today, the electronic communication between different parts of the microchip is conducted over copper wires. Likewise, the information between the circuits on the motherboard is relayed electronically via copper wires. As processors become faster and computers have an increasing number of processor cores, one factor restricting computer speed is the data-transfer capacity of copper conductors. This limitation can be overcome by introducing optical data transfer inside and between chips. Even though optical fibres have been used in long-distance telecommunications for many years, the development of miniature-sized optical connections inside chips is only at its initial stages.
Tapani Alasaarela completed his matriculation examination at Oulun Lyseo Upper Secondary School in 2005. He graduated as Bachelor of Science (Technology) at the Helsinki University of Technology in January 2007 and as Master of Science at Imperial College London in 2008.
The public examination of Tapani Alasaarela’s dissertation “Atomic layer deposited titanium dioxide in optical waveguiding applications” will take place on Wednesday 29 June at 12 noon at Aalto University School of Electrical Engineering (lecture hall AS1 of the TUAS building) at Otaniementie 17, Espoo.
Doctor Laurent Vivien from L'Université Paris-Sud in France will act as the opponent and Professor Seppo Honkanen from Aalto University Department of Micro- and Nanosciences as the custos.
Contacts and sources:
Tapani Alasaarela
Aalto University
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