Abstract-Active phase control of terahertz pulses using a dynamic waveguide

Lauren Gingras, Wei Cui, Aidan W. Schiff-Kearn, Jean-Michel Ménard, and David G. Cooke

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-11-13876

Control over the spectral phase of a light pulse is a fundamental step toward arbitrary signal generation in a spectral band. For the terahertz spectral regime, pulse shaping holds the key for applications ranging from ultra-high speed wireless data transmission to quantum control with shaped fields. In this work, we demonstrate a technique for all-optical and reconfigurable control of the spectral phase of a light pulse in the important terahertz (THz) band. The technique is based on interaction of a guided THz pulse with patterned photoexcited regions within a uniform silicon-filled parallel-plate waveguide. We use this platform to demonstrate broadband and tunable positive and negative chirp of a THz pulse, as well as control of the pulse carrier envelope phase.

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Abstract-Dynamic creation of a light-induced terahertz guided-wave resonator

Lauren Gingras, François Blanchard, Marcel Georgin, and David G. Cooke
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-3-2496

We demonstrate a dynamic light-induced resonator for terahertz (THz) frequency light created on ultrashort time scales inside a planar waveguide. The resonator is created by patterned femtosecond photoexcitation of a one-dimensional array of photoconductive regions inside a silicon-filled parallel plate waveguide. The metal-dielectric photonic crystal is created on a 2 ps time scale, ten times faster than the 20 ps transit time of the THz light through the array. The resonance reveals itself through narrowband THz transmission enhancement with accompanying phase modulation producing an induced group delay of up to 10.8 ps near resonance.

© 2016 Optical Society of America

Full Article  |  PDF Article