Nathan Jukam

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The amplification of spontaneous emission is used to initiate laser action. As the phase of spontaneous emission is random, the phase of the coherent laser emission (the carrier phase) will also be random each time laser action begins. This prevents phase-resolved detection of the laser field. Here, we demonstrate how the carrier phase can be fixed in a(More)
GaAs terahertz ͑THz͒ photonic crystals are fabricated using reactive ion etching. A femtosecond laser beam generates THz radiation inside the PCs. Spatial patterning of the laser beam is used to couple into the PC modes. THz emission is observed from modes above the light line ͑leaky modes͒. Only the dipole modes are found to radiate strongly in the(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)
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)
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