Abstract

We propose an integrated terahertz emitter operating at room temperature between 2.4 and 6THz. Based on difference-frequency generation in a triply resonant AuAlAsGaAsAlAsAu microcylinder, this nonlinear source is pumped by two near-IR whispering-gallery modes that are excited by InAs quantum dots embedded in the resonator. In the vertical direction, these pump modes are due to total internal reflection at GaAsAlAs interfaces, while the terahertz mode is confined between the metallic layers. This parametric source offers potential advantages with respect to existing terahertz sources for spectroscopic applications, such as room-temperature operation and electrical pumping.

© 2008 Optical Society of America

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