Coherent upconversion of light

A method comprising:

• simultaneously receiving (i) light waves emanating from an object and having first frequency components f1.1 and f1.2, and (ii) pumped monochromatic coherent light waves having a second frequency f2,
• non-linearly combining the light waves having the first frequency component f1.1 and the pumped monochromatic coherent light waves having the second frequency f2;
• generating by a second order parametric process coherent light waves having a third frequency component f3.1 that is a sum of the first frequency f1.1 and the second frequency f2;
• non-linearly combining the light waves having the first frequency component f1.2 and the pumped monochromatic coherent light waves having the second frequency f2;
• generating by a second order parametric process coherent light waves having a third frequency component f3.2 that is a sum of the first frequency f1.2 and the second frequency f2;
• digitizing the generated light waves having the frequency components f3.1 and f3.1;
• and
• outputting in response to the digitized generated light waves an image responsive to the light waves having frequency components f1.1 and f1.2 emanating from the object.

An apparatus comprising:

• a metasurface configured to coherently upconvert incident light waves emanating from an object and having first frequency components f1.1 and f1.2, the metasurface comprising:
• a substrate having a first negative-permittivity layer comprising a substrate plasmonic surface;
• a first metasurface pixel comprising a first plasmonic nanoparticle having a base with a negative-permittivity layer comprising a first pixel plasmonic surface;
• a second metasurface pixel comprising a second plasmonic nanoparticle having a second base with a second negative-permittivity layer comprising a second pixel plasmonic surface;
• a dielectric layer comprising a second-order nonlinear dielectric material disposed between the substrate plasmonic surface and the respective first pixel plasmonic surface and the second pixel plasmonic surface;
• wherein the first metasurface pixel is configured to form at least three plasmonic resonant modes in the dielectric layer, the at least three plasmonic resonant modes including a first plasmonic resonant mode having the first frequency component f1.1, a second plasmonic resonant mode having a second frequency f2, and a third plasmonic resonant mode having a third frequency component f3.1;
• wherein the second metasurface pixel is configured to form at least three plasmonic resonant modes in the dielectric layer, the at least three plasmonic resonant modes including a first plasmonic resonant mode having the first frequency component f1.2, a second plasmonic resonant mode having the second frequency f2, and the third plasmonic resonant mode having a third frequency component f3.2;
• wherein the metasurface is configured to generate by a second order parametric process coherent light waves having the third frequency components f3.1 and f3.2 that are a sum of the first frequency components f1.1 and f1.2 and the second frequency f2;
• a second light propagation path from a source of pumped monochromatic coherent light waves having the second frequency f2 to the metasurface;
• and
• a digital image capture device substantially transparent to light waves having the first frequency components f1.1 and f1.2, and including a first capture pixel configured to capture the light having the third frequency component f3.1 generated by the first metasurface pixel and a second capture pixel configured to capture the light having the third frequency component f3.2 generated by the second metasurface pixel.

A method comprising:

• simultaneously receiving (i) light waves emanating from an object and having first frequency components f1.1 and f1.2, and (ii) pumped monochromatic coherent light waves having a second frequency f2,
• non-linearly combining the light waves having the first frequency component f1.1 and the pumped monochromatic coherent light waves having the second frequency f2;
• generating by a second order parametric process coherent light waves having a third frequency component f3.1 that is a sum of the first frequency component f1.1 and the frequency of the second frequency f2;
• non-linearly combining the light waves having the first frequency component f1.2 and the pumped monochromatic coherent light waves having the second frequency f2;
• generating by a second order parametric process coherent light waves having a third frequency component f3.2 that is a sum of the first frequency f1.2 and the second frequency f2;
• capturing the generated light waves having the third frequency component f3.1;
• capturing the generated light waves having the third frequency component f3.2;
• digitizing the captured light waves having the third frequency component f3.1 and the captured light waves having the third frequency f3.2;
• and
• outputting in response to the digitized captured light waves an image responsive to the light waves frequency components f1.1 and f1.2 emanating from the object.