Optical devices

An optical device to amplify an input light propagating along an optical path, the optical device comprising:

• a substrate;
• and
• a plurality of light emitters disposed on the substrate in the optical path, the light emitters each having a footprint on the substrate and extending away from the substrate laterally to the optical path, the light emitters each comprising a quantum well to emit an emitted light when the light emitter is electrically biased and exposed to the input light, the emitted light from the plurality of the light emitters to form an output light having an amplitude greater than a corresponding amplitude of the input light, and the light emitters each having a refractive index higher than a corresponding refractive index of an environment outside of and abutting the light emitters;
• wherein:
• the light emitters each comprise a nanorod;
• and
• each pair of neighboring nanorods are spaced from one another along the optical path by a distance being about (q+¼)∧, where ∧ is a wavelength of the input light and q is an integer greater than or equal to zero.