In this paper, we present a new approach for the enhancement of pulsed terahertz (THz) generation in quantum dot (QD) based photoconductive antennas (PCA). We demonstrate the benefits of the combination of a QD substrate based PCA and an interdigitated electrodes topology which allows the photocarriers to reach the antenna terminals in a quasi-ballistic regime and immediately contribute to the THz emission. A 50-fold increase in the generated THz power is observed. Such enhancement is made possible by unique combination of QD substrate properties, such as very high electric and thermal breakdown ruggedness, high carrier mobility, and yet short carrier lifetimes, compared to typical low temperature grown materials. We expect this solution to become favourable for development of powerful compact THz emitters.
|Number of pages||5|
|Journal||IEEE Journal of Selected Topics in Quantum Electronics|
|Early online date||3 May 2023|
|Publication status||Published - Sept 2023|
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Funding & Acknowledgsments: The PCAs were developed within the financial support of the Russian Science Foundation, grant 19-79-10240 (prerequisite
simulation and topology) and grant 18-79-10195 (THz characterisation of the PCAs). The technological routine of their fabrication was supported by the Ministry of Science and Higher Education of the Russian Federation in the scope
of the government assignment (Agreement 075-03-2023-106 13.01.2023). The authors will also like to acknowledge financial support from EPSRC (Grant no. EP/R024898/1) and EU H2020 (Grant No. 824996).
- Principal component analysis
- photoconducting devices
- terahertz materials
- Broadband antennas
- quantum dots
- terahertz radiation