Numerical Investigation on the Temperature dependent Impedance Characteristics of Far-Infrared Quantum Cascade Lasers

Numerical Investigation on the Temperature dependent Impedance Characteristics of Far-Infrared Quantum Cascade Lasers P Ashok M Ganesh Madhan S Gopinath T R Premila N Janaki Abstract Quantum Cascade Lasers (QCLs) as Terahertz (THz) frequency sources offer a potentially viable solution for new applications in mid and far-infrared frequency bands. This research work exhaustively investigates the temperature dependence on the impedance of temperature dependent Quantum Cascade Lasers (QCLs) operating at 116μm, for the first time. In the 90-stage QCL considered for the work, the cold finger temperature is varied from 15K to 45K. When the device is biased at 0.6A current along with a cold finger temperature of 45K, the magnitude of intrinsic impedance was found to be 23.91mΩ, at a frequency of 4GHz. As the cold finger temperature is increased from 15K to 45K, the impedance response of the device becomes flat and stays constant. At 45K with an injected current of 1.5A, maximum impedance of 3.1mΩ is obtained. The resonant frequency characteristics of the device increase with increase in injected current and cold finger temperature. Also, it is observed that the magnitude of intrinsic impedance decreases with increase in injected current. The impact of cold finger temperature on the intrinsic impedance characteristics are detailed for prospective Radio over Fiber (RoF) applications.
03 01 2023 012018 http://dx.doi.org/10.1088/crossmark-policy iopscience.iop.org Numerical Investigation on the Temperature dependent Impedance Characteristics of Far-Infrared Quantum Cascade Lasers Journal of Physics: Conference Series paper Published under licence by IOP Publishing Ltd http://creativecommons.org/licenses/by/3.0/ https://iopscience.iop.org/info/page/text-and-data-mining 10.1088/1742-6596/2466/1/012018 https://iopscience.iop.org/article/10.1088/1742-6596/2466/1/012018 https://iopscience.iop.org/article/10.1088/1742-6596/2466/1/012018/pdf https://iopscience.iop.org/article/10.1088/1742-6596/2466/1/012018/pdf https://iopscience.iop.org/article/10.1088/1742-6596/2466/1/012018 https://iopscience.iop.org/article/10.1088/1742-6596/2466/1/012018/pdf J. Sel. Top. Quantum Electron. Razeghi 15 941 2009 10.1109/JSTQE.2008.2006764 IEEE Appl. Phys. Lett. Bai 98 2011 Nat. Photonics Bai 4 99 2010 10.1038/nphoton.2009.263 Appl. Phys. Lett. Bandyopadhyay 101 2012 10.1063/1.4769038 Laser Phys. Lett. Ashok 16 1 2019 10.1088/1612-202X/ab39dc Laser Phys. Lett. Ashok 17 1 2020 10.1088/1612-202X/ab7dcd Def Sci. J Murali Krishna 70 538 2020 10.14429/dsj.70.16340 J. Opt. Laser Technol. Ashok 134 2021 10.1016/j.optlastec.2020.106662 Laser Phys. Lett. Gopinath 18 1 2021 10.1088/1612-202X/abf83a Optik Murali Krishna 257 1 2022 Optik Ashok 204 2020 Optik Murali Krishna 219 2020 10.1016/j.ijleo.2020.165018 J. Optoelectron. Adv. Mater. Ozyazici 6 1243 2004 Int J Optoelectron Ganesh Madhan 12 99 1998 Laser Phys. Lett. Ashok 18 1 2021 10.1088/1612-202X/abdcbc IEEE J. Sel.Top. Quantum Electron. Agnew 23 1 2017 10.1109/JSTQE.2016.2638539 Appl.Phys. Lett. Agnew 106 2015 10.1063/1.4918993 IEEE Photonic Tech L Weisser 6 1421 1994 10.1109/68.392224