Kabushiki Kaisha Toshiba

Cambridge University Technical Services Limited

Toshiba Research Europe Limited

David Mark Whittaker

Andrew James Shields

Edmund Harold Linfield

Clare Foden

Donald Dominic Arnone

Craig Michael Ciesla

Alexander Giles Davies

Richard Andrew Hogg

Michael Johnston

An encoding method, decoding method and a communication method using single photons where information is directly encoded into each photon. In one embodiment at least two out of the three parameters of phases, polarization, and energy are used to encode information. In another embodiment, three or more non-orthogonal states with respect to each parameter are used. A further embodiment is also described which uses selective grouping of the results in order to more clearly detect the presence of an eavesdropper. Apparatus capable of performing the methods are also provided.

Encoding, decoding and communication method and apparatus

A device for generating terahertz radiation. The device comprising a dipole generating layer, a coupling block and an extraction block. The coupling block is transparent to laser light and is in contact with the surface of the dipole generating layer to couple light from a laser to the surface of the dipole generating layer, when the device is in use. The extraction block is located in contact with the surface of the dipole generating layer to provide an emission extraction surface. The refractive indices of the dipole forming layer, the coupling block and the extraction block are substantially equal. In this way, the dipole which is generated upon illumination of the dipole generating layer by a laser, has an axis which is not perpendicular to the emission.

Device for generating THz radiation

An optical device for efficient radiation emission having a modulation region with phase matching means ( ) for enhancing the phase matching between two different frequency signals propagating in the optical modulation region ( ) in response to illumination by at least one incident beam ( ), the phase matching means ( ), having a spatial variation in its refractive index ( ) along the path of the incident radiation beam ( ). The device may be configured as a radiation source comprising a frequency conversion member (C ) for emitting a beam of radiation ( ) in response to irradiation by one or more input beams ( ), the emitted beam ( ) having a frequency different to that of the one or more input beams ( ), the one or more input beams ( ) all being produced within a lasing cavity (defined by M M M M and output coupler ( )) and said frequency conversion member (C ) being located within said lasing cavity. The invention also extends to an imaging system using the radiation source.

Optical device and imaging system

Growing community of inventors

Cambridge, United Kingdom

David Mark Whittaker