Learn More
For future ultrafast all-optical networks, new optical devices are required that directly manipulate communication channels to shift their wavelength over the bandwidth of an optical fiber (50THz). 1,2 Current proposed solutions based on nonlinear processes, however, suffer from small efficiencies owing to low nonlinear susceptibilities. 3 Here, we(More)
A terahertz (THz) frequency quantum cascade laser (QCL) is used as an integrated injection seeded source and amplifier for use in THz time-domain spectroscopy. A THz input pulse is generated inside a QCL, by illuminating the laser facet with a near-infrared pulse from a femtosecond laser, and amplified using gain switching. The THz output from the QCL is(More)
The interaction between intersubband resonances (ISRs) and metamaterial microcavities constitutes a strongly coupled system where new resonances form that depend on the coupling strength. Here we present experimental evidence of strong coupling between the cavity resonance of a terahertz metamaterial and the ISR in a high electron mobility transistor (HEMT)(More)
  • 1