Planarized tapered waveguides for high-temperature THz quantum cascade laser frequency combs
Abstract
We present a novel planarized double metal waveguide platform for high-performance THz quantum cascade laser frequency combs. The waveguides are embedded in a low-loss polymer (BCB) and have an extended top metallization, resulting in lower waveguide losses and improved RF and thermal properties. A further performance improvement is observed for waveguides with a tapered profile due to nonlinearity-enhancing effects. These free-running devices produce strong single RF beatnotes up to almost −30 dBm at 90 K, nearly three orders of magnitude stronger than for ridge devices. The improved comb performance is maintained for higher operating temperatures, with a 200 GHz comb bandwidth and a single RF beatnote above −60 dBm at a heat sink temperature of 115 K. Show more
Publication status
publishedExternal links
Book title
2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)Pages / Article No.
Publisher
IEEEEvent
Organisational unit
03759 - Faist, Jérôme / Faist, Jérôme
Notes
Conference lecture held on August 30, 2022.More
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