Coupled cavity terahertz quantum cascade lasers with integrated emission monitoring |
Optics Express, Vol. 23, Issue 3, pp. 3581-3588 (2015)
http://dx.doi.org/10.1364/OE.23.003581
http://dx.doi.org/10.1364/OE.23.003581
We demonstrate the on-chip generation and detection of terahertz radiation in coupled cavity systems using a single semiconductor heterostructure. Multiple sections of a terahertz quantum cascade laser structure in a double-metal waveguide are optically coupled and operate either as a laser or an integrated emission monitor. A detailed analysis of the photon-assisted carrier transport in the active region below threshold reveals the detection mechanism for photons emitted by the very same structure above threshold. Configurations with a single laser cavity and two coupled laser cavities are studied. It is shown that the integrated detector can be used for spatial sensing of the light intensity within a coupled cavity.
© 2015 Optical Society of America
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