US 12,035,078 B2
Light source device and projector
Fumika Yamada, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 29, 2022, as Appl. No. 17/706,763.
Claims priority of application No. 2021-054823 (JP), filed on Mar. 29, 2021.
Prior Publication US 2022/0311978 A1, Sep. 29, 2022
Int. Cl. H04N 9/31 (2006.01); G03B 21/20 (2006.01)
CPC H04N 9/3152 (2013.01) [G03B 21/204 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A light source device comprising:
a light source configured to emit excitation light;
a phosphor which the excitation light enters, the phosphor being configured to emit fluorescence different in wavelength from the excitation light, the phosphor comprising a first surface;
a plurality of nanoantennas provided to the phosphor, the plurality of nanoantennas comprising a first nanoantenna group and a second nanoantenna group, the first nanoantenna group comprising each of the plurality of nanoantennas formed of a first material, the second nanoantenna group comprising each of the plurality of nanoantennas formed of a second material that is different from the first material;
each nanoantenna of the first nanoantenna group being disposed at a first location on the first surface; and
each nanoantenna of the second nanoantenna group being disposed at a second location on the first surface, the second location being different from the first location, wherein
the first nanoantenna group is disposed around the second nanoantenna group such that the first nanoantenna group surrounds the second nanoantenna group,
the first material comprises metal,
the second material has a greater melting point than the first material,
an arrangement area of the second nanoantenna group overlaps an irradiation area with the excitation light in a plan view,
an arrangement area of the first nanoantenna group is outside the irradiation area with the excitation light in a plan view,
nanoantennae of the second nanoantenna group positioned to a center of the arrangement area of the second nanoantenna group are adjacent to other second nanoantennae,
nanoantennae of the second nanoantenna group positioned to an outer periphery of the arrangement area of the second nanoantenna group are adjacent to both the other second nanoantenna and first nanoantennae, and
an electric field enhancement of the fluorescence is achieved by each nanoantenna of the first nanoantenna group and each nanoantenna of the second nanoantenna group.