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Using metal-clad (or plasmonic) waveguide structures in semiconductor laserscarries a promise of reduced size, threshold, and power consumption. Thispromise is put to a rigorous theoretical test, that takes into accountincreased waveguide loss, Auger recombination, and Purcell enhancement ofspontaneous recombination. The conclusion is that purported benefits of metalwaveguides are small to nonexistent for all the band-to-band and intersubbandlasers operating from UV to Mid-IR range, with a prominent exception of far-IRand THz quantum cascade lasers. For these devices, however, metal waveguidesalready represent the state of the art, and the guiding mechanism in them hasfar more in common with a ubiquitous transmission line than with plasmonics.

Prospects and merits of metal-clad semiconductor lasers from nearly UV to far IR