Photo-detector having plasmonic resonance and photon crystal thermal noise suppression
A photo-detector having a photonic crystal structure for absorbing photons passing perpendicular to a surface of the photo-detector and a plasmonic resonance structure for absorbing photons passing along the surface of the photo-detector.
1. A photo-detector, comprising:
a photonic crystal structure comprising a plurality of pillar-like first dielectric regions and a plurality of second dielectric regions, each one of the second dielectric regions being disposed between a pair of the pillar-like first dielectric regions, the pillar-like first plurality of dielectric regions having a different dielectric constant than the plurality of second dielectric regions;
a plurality of plasmonic resonance structures, each one of the plurality of plasmonic resonance structures having a surface, such surface having a protrusion projecting outwardly from the surface, such protrusion projecting into a top surface of a corresponding one of the plurality of pillar-like first dielectric regions.
2. The photo-detector recited in claim 1 wherein the plurality of spaced pillar-like structures are spaced in accordance with a predetermined wavelength of photons to be absorbed by the photonic crystal structure.
3. The photo-detector recited in claim 2 wherein each one of the plurality of the plasmonic resonance structures comprises a metal grating structure having a plurality of spaced ridges.
4. A photo-detector, comprising:
a photonic crystal structure comprising a plurality of pillar-like first dielectric structures, each one of the plurality of pillar-like first dielectric structures having a top surface and sidewalls, and a plurality of second dielectric regions, each one of the second dielectric regions being disposed between a pair of the pillar-like first dielectric structures, the pillar-like first plurality of dielectric structures having a different dielectric constant than the plurality of second dielectric regions;
a plurality of plasmonic resonance structures, each one of the plurality of plasmonic resonance structures being disposed on a corresponding one of the plurality of pillar-like first dielectric structures, each one of the plurality of plasmonic resonance structures having a plasmonic resonance structure surface facing the top surface of the corresponding one of the plurality of pillar-like first dielectric structures, the plasmonic resonance structure surface of each one of the plurality of plasmonic resonance structures having a protrusion spaced from the sidewalls of the corresponding one of the plurality of pillar-like first dielectric structures and projecting outwardly from the plasmonic resonance structure surface, such protrusion projecting into the top surface of the corresponding one of the plurality of pillar-like first dielectric regions.