| 摘要 |
<p>A device is arranged to couple with an electromagnetic source 401, such as an LED light source to increase luminous efficiency. The device comprises a first optical metamaterial arranged to increase the intensity of radiation at a predetermined wavelength. The optical meta material has a periodic reflective component 405 having a dimension no greater than the predetermined wavelength. The periodic reflective component may comprise a regular planar grid or array of metal reflectors on a dielectric support. The LED may be mounted on a reflective surface 403 and the metamaterial may include a fluorescent phosphor material to convert radiation at the predetermined wavelength to a visible wavelength. A second optical metamaterial arranged to increase the intensity of radiation at a second wavelength may be layered on the first metamaterial.</p> |
