Illumination Device

摘要

Proposed is an illumination device (100), comprising a light source (110) such as an LED or a laser diode, a wavelength conversion medium (120) such as a phosphor, and a periodic antenna array (300) made of a highly polarisable material such as a metal. The light source emits primary wavelength light that at least partially is converted in secondary wavelength light by the wavelength conversion medium. The periodic antenna array is positioned in close proximity to the wavelength conversion medium and functions to enhance the efficiency of the absorption and/or emission processes in the wavelength conversion medium through the coupling of the incident primary wavelength light or the emitted secondary light to surface lattice resonances that arise from the diffractive coupling of localized surface plasmon polaritons in the individual antennas of the array. This is especially advantageous for forming low étendue illumination device suitable for use in projection systems, or for controlling the directionality, the polarization, and/or the color of the secondary wavelength light.

主权项

1. A structure comprising:
a semiconductor light emitting device for emitting a first light at a first wavelength; a wavelength conversion medium arranged to convert at least part of the first light into a second light at a second wavelength; and a periodic antenna array comprising a plurality of antennas, wherein the periodic antenna array supports surface lattice resonances arising from diffractive coupling of localized surface plasmon resonances in at least one of the antennas; wherein the wavelength conversion medium is disposed between the periodic antenna array and the semiconductor light emitting device.