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Seminar - Photonic Devices: Controlling, Changing and Using Light

Abstract

Most human beings have the good fortune to be able to see electromagnetic waves that lie in the part of the wavelength/frequency spectrum that we call 'visible'. Outside of the visible spectrum lie the regions known as the infra-red (at longer wavelengths) and the ultra-violet (at shorter wavelengths). Both of these regions of the spectrum are important for human beings, in a variety of ways. For instance, infra-red light propagating along fine fibres of very pure glass is used for the communication of a large fraction of the total electronic data that is transported on the internet. Shaped ultra-violet light is a vital source for the manifold replication of the patterns of different layers made of different materials that are required in the manufacture of silicon integrated circuits – in the process known as ultra-violet lithography. Ultra-violet light can also cause damage to both living creatures and plants. For many purposes, it is convenient to treat light physically as being a wave - but there are also situations where it is appropriate to describe the behaviour of light as being due to particles that we call photons. The emission of light by a source such as an LED or semiconductor laser is an example of photonic behaviour, as is the detection of light by a photo-diode. This lecture will describe how some specific photonic devices are made and how they work. It will also provide examples of how light is exploited in a variety of applications that include sensors for medical diagnosis; display devices in mobile phones, laptop computers and televisions – and wavelength (‘colour’) selection in fibre-optical communications.

Speaker Biographical Sketch

Richard De La Rue was appointed as lecturer at the University of Glasgow in 1971, becoming Senior Lecturer there in 1982, Reader in 1985 - and Professor of Optoelectronics in 1986. On formal retirement from the University of Glasgow in 2010 he became Emeritus Professor and Honorary Senior Research Fellow. Since April 2011 he has been Visiting Professor at the Photonics Research Centre in the Physics Department of the University of Malaya in Kuala Lumpur, Malaysia.

His recent research has been particularly concerned with photonic crystal and photonic wire structures, waveguide micro-cavities and metamaterials. His research in the area of photonic crystals has evolved to cover compact lasers, planar micro-cavities, photonic-crystal LEDs and applications in bio-medical sensing. His research on metamaterials has particularly emphasized the use of semiconductor substrates and the impact of the choice of metallization on the behaviour of metamaterials - and their application in organic sensing. Other research interests include integrated optics technology, photonic integrated circuits (PICs), DFB and DBR semiconductor lasers. He has published more than 250 articles as papers in journals and magazines - and as book chapters.

The PQLDI project, supported by the UK Technology Strategy Board, involved him in collaboration with three other groups – and was concerned with the application of photonic quasi-crystal (PQC) techniques for enhanced extraction of light from blue LEDs. For two years from mid-1999 he served as IEEE-LEOS Distinguished Lecturer. He is a Fellow of the IEEE (2003); Fellow of the OSA (2007) - and Fellow of the Royal Academy of Engineering (2002); Fellow of the Royal Society of Edinburgh (1989) and Fellow of the Institution of Engineering and Technology (1997).

Date: 21 Nov 2011 (Monday)
Time: 3:00pm – 4:30pm
Venue: G6302 (Lift 7), 6/F, Academic Bldg, City University of Hong Kong,
83 Tat Chee Avenue, Kowloon Tong, Kowloon,
Hong Kong.
Fee: Complimentary
Language: English

For seat reservation, please fax the Registration Form to (852)-2788 7579 on / before 21 November 2011.