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Optics and photonics
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Although the general public is likely to associate "optics" with telescopes and contact lenses, the applications and the underpinning science of optics and photonics are much broader in scope and much more dynamic as a research discipline.

A diverse range of the industries rely heavily on optics and photonics and they continue to prosper and grow. The new technologies emerging from research laboratories and universities mean that this growth is sure to continue into the future.

Optical technologies are the basis of many of today's popular and powerful technologies: the small semiconductor laser in your CD player and the fibre optic network connecting you to the Internet both rely on developments in optics. Soon, research currently under way may enable computers using optical technology to help solve difficult problems such as weather forecasting.

Optical sciences deal with the study of light and its behaviour (although by "light" we often mean the near infra red and ultraviolet, as well as the visible spectrum). The long established traditional areas of optical science are geometrical optics (how light is reflected and refracted by media - critical to the correct design of optical systems) and physical optics (which is concerned with the nature and properties of light). These remain vital and active area of research and application. For example, adaptive optical systems, which use computer-controlled optical elements to eliminate aberrations or distortions introduced by atmospheric disturbances are already being used by astronomical telescopes and may be used to improve vision. However, there are many other exciting and innovative areas where development relies heavily on research in the fields of optics and photonics.

Recent applications of optical research result from work on new light sources and new material to manipulate light. Solid-state light sources (light emitting diodes - LEDs - and lasers) use semiconductor technologies to produce light sources that are small, controllable and can be integrated within electronic systems. LEDs with their low power consumption, small size and bright light are ubiquitous on watches, microwave ovens and car dashboards, yet they only began to be used widely in commercial applications in the 1970s. Future applications abound, in particular research to develop white light LEDs which will replace fluorescent tubes and general lighting. With lower power consumption and longer life, the 20 - 30% of electricity generated for lighting can be significantly reduced, with obvious savings in cost and greenhouse gas emissions.

Another major application for light sources is in optical communication networks. Light, due to its higher frequency, offers incredible increases in the amount of information that it can carry compared with radio or satellite systems. This light can be carried around the globe using fibre optic networks. Fibre optic is a fine strand of glass tailored so that light that enters the fibre remains within it. A piece of fibre optic is one thousandth of a millimetre in diameter and, coupled with the appropriate light source, can carry the equivalent of 30,000 telephone calls simultaneously!