Abstract
Room temperature spasing of surface plasmon polaritons at 1.46 μm wavelength has been demonstrated by sandwiching a gold-film plasmonic waveguide between optically pumped InGaAs quantum-well gain media. The spaser exhibits gain narrowing, the expected transverse-magnetic polarization, and mirror feedback provided by cleaved facets in a 1-mm long cavity fabricated with a flip-chip approach. The 1.06-μm pump-threshold of ~60 kW/cm2 is in good agreement with calculations. The architecture is readily adaptable to all-electrical operation on an integrated microchip.
Highlights
The field of plasmonics exploits the surface plasmon, a hybridized mode of conduction currents and optical fields confined to a metallic surface
Micro-scale sources [12,13,14] may be simpler to fabricate, and can in principle be coupled to nano-waveguides [15], but electrical excitation has so far been limited to the longwave IR (7.5 μm) where ohmic losses are reduced [16,17,18]
An inset with linear scale shows that the output increases quasi-linearly above a clear threshold near 60 kW/cm2, following classic laser behavior
Summary
Room temperature spasing of surface plasmon polaritons at 1.46 μm wavelength has been demonstrated by sandwiching a gold-film plasmonic waveguide between optically pumped InGaAs quantum-well gain media. The spaser exhibits gain narrowing, the expected transverse-magnetic polarization, and mirror feedback provided by cleaved facets in a 1-mm long cavity fabricated with a flip-chip approach. The 1.06-μm pump-threshold of ~60 kW/cm is in good agreement with calculations. The architecture is readily adaptable to all-electrical operation on an integrated microchip.
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