Technologies for a phase-locked terahertz plasmonic laser array with microcavities

A plasmonic laser array device, comprising:

• a first microcavity element, the first microcavity having a first radiating end facet and a second radiating end facet opposite the first radiating end facet in a longitudinal direction of the device;
• a second microcavity element, the second microcavity having a third radiating end facet and a fourth radiating end facet opposite the third radiating facet in the longitudinal direction of the device;
• a first microcavity gap configured to separate the first microcavity element and the second microcavity element in the longitudinal direction of the device, a distance between the first microcavity element and the second microcavity element being configured as an integer multiple of a surface plasmon polariton (SPP) wavelength;
• a bottom layer configured to underly the first microcavity element, the second microcavity element, and the first microcavity gap;
• and
• an arrangement of the first microcavity element and the second microcavity element on the bottom layer, the arrangement configured such that the second radiating end facet is opposite the third radiating end facet across the first microcavity gap, the arrangement placing at least the first microcavity element and the second microcavity element into a phase-locked orientation for a phased-locked operation of the plasmonic laser array device.