Journal
OPTICS EXPRESS
Volume 23, Issue 3, Pages 3581-3588Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.003581
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Funding
- Austrian Science Fund FWF [SFB IR-ON F25, SFB NextLite F49, DK CoQuS W1210, DK Solids4Fun W1243]
- Austrian Nano Initiative project (PLATON)
- Austrian Society for Microelectronics (GMe)
- Austrian Science Fund (FWF) [W1210, W1243] Funding Source: Austrian Science Fund (FWF)
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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. (C) 2015 Optical Society of America
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