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We study a "strongly-coupled" (SC) polariton system formed between theatom-like intersubband transitions in a semiconductor nanostructure and the THzoptical modes that are localised at the edges of a gold aperture. Thepolaritons can be excited optically, by incoherent excitation with bandgapradiation, and we find that they also coherently scatter the same input laser,to give strikingly sharp "sideband" (SB) spectral peaks in the backscatteredspectrum. The SB intensity is a sensitive track of the polariton density andthey can be detected down to a quantum noise floor that is more than 2500 timeslower than the excitation thresholds of comparable quantum cascade laserdiodes. Compared with other coherent scattering mechanisms, higher order SBscattering events are readily observable, and we speculate that the effect mayfind utility as a passive all-optical wavelength shifting mechanism intelecommunications systems.

Thresholdless Coherent Light Scattering from Subband-polaritons in a Strongly-Coupled Microcavity