Illumination device
Embodiments of the invention include a semiconductor light emitting device for emitting a first light at a first wavelength and a wavelength conversion medium arranged to convert at least part of the first light into a second light at a second wavelength. The wavelength conversion medium is disposed between a periodic antenna array and the semiconductor light emitting device. The periodic antenna array includes a plurality of antennas. The periodic antenna array supports surface lattice resonances arising from diffractive coupling of localized surface plasmon resonances in at least one of the antennas.
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 a distance between the wavelength conversion medium and the periodic antenna array is smaller than the wavelength of the first light or the second light.
2. The structure of claim 1 wherein the periodic antenna array supports surface lattice resonances at least at one of the first wavelength and the second wavelength.
3. The structure of claim 1 wherein the distance is smaller than 700 nm.
4. The structure of claim 1 wherein the distance is smaller than 300 nm.
5. The structure of claim 1 wherein the periodicity of the periodic antenna array is of the order of the first wavelength or the second wavelength.
6. The structure of claim 1 wherein the antennas comprise a material selected from the group consisting of a noble metal, gold, silver, copper, platinum, palladium, nickel, aluminum, and an alloy.
7. The structure of claim 6 wherein the antennas comprise a chromium adhesive.
8. The structure of claim 1 wherein the periodic antenna array is disposed on a transparent substrate.
9. The structure of claim 8 wherein the transparent substrate is conformed for mechanical stretching, wherein the mechanical stretching may be thermally induced, humidity induced, or electrically induced.
10. The structure of claim 8 wherein the transparent substrate is conformed for mechanical stretching, wherein the mechanical stretching may be controlled by a microelectromechanical system or a liquid crystal polymer that deforms due to a phase transition.
11. The structure of claim 8 wherein the transparent substrate comprises a material showing a piezo-electrical effect.
12. The structure of claim 11 wherein the material showing piezo-electrical effect is selected from the group consisting of LiNbO 3 and potassium titanyl phosphate.
13. The structure of claim 8 wherein the transparent substrate comprises a deformable polymer.