The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland

The Secretary of State for Defence in Her Brittanic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland

Richard Simon Blacker

Ian Charles Sage

Leigh Trevor Canham

Timothy Ingram Cox

Keith Loder Lewis

Ian Robert Mason

Armando Loni

Andrew John Simons

An electroluminescent device ( ) comprises a porous silicon region ( ) adjacent a bulk silicon region ( ), together with a top electrical contact ( ) of transparent indium tin oxide and a bottom electrical contact ( ) of aluminum. The device includes a heavily doped region ( ) to provide an ohmic contact. The porous silicon region ( ) is fabricated by anodizing through an ion-implanted surface layer of the bulk silicon. The silicon remains unannealed between the ion-implantation and anodization stages. The device ( ) has a rectifying p-n junction within the porous silicon region ( ).

Electroluminescent device comprising porous silicon

A tunable filter in particular for use in the visible or near infrared wavelength region, comprising a nano dispersed composite material contained within a resonant cavity structure comprising dielectric mirrors (,), where the material is polarizable by means of an applied electric field. In particular, the polarizable material may be a nano phase polymer dispersed liquid crystal (PDLC) material where the diameter of liquid crystal droplets (,) within the material (,) is less than 0.1 &mgr;m, and for use in the visible wavelength region is typically between 10 nm and 50 nm. The filter also comprises structure for applying a variable electric field across the faces of the material. The transmission-wavelength characteristic of the filter is such that maxima and minima are shifted in wavelength by varying the electric field.

Tunable nano-phase polymer dispersed liquid crystal filter

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Malvern, United Kingdom

Richard Simon Blacker