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Microwave modulation of terahertz quantum cascade lasers: a transmission-line approach

2010; American Institute of Physics; Volume: 96; Issue: 2 Linguagem: Inglês

10.1063/1.3284518

1520-8842

W. Maineult, Lu Ding, P. Gellie, Pascal Filloux, Carlo Sirtori, S. Barbieri, T. Akalin, Jean-Francois Lampin, I. Sagnes, Harvey E. Beere, D. A. Ritchie,

Photonic and Optical Devices

We report on microwave impedance measurements of metal-metal ridge-waveguide terahertz quantum cascade lasers. Experimental data, recorded at 4 K in the 100 MHz–55 GHz range, are well reproduced by distributed-parameter transmission-line simulations, showing that the modulation cutoff is limited by the propagation losses that increase for higher microwave frequencies, yielding a 3 dB modulation bandwidth of ∼70 GHz for a 1 mm-long ridge. By using a shunt-stub matching we demonstrate amplitude modulation of a 2.3 THz QCL up to 24 GHz.