Journal
OPTICS EXPRESS
Volume 21, Issue 5, Pages 5842-5858Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.005842
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Funding
- National Institute for Standards and Technology [60NANB10D137]
- STC program of the National Science Foundation [DMR-0120967]
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We use coupled mode theory, adequately incorporating optical losses, to model ultra-broadband terahertz (THz) waveguide emitters (0.1-20 THz) based on difference frequency generation of femtosecond infrared (IR) optical pulses. We apply the model to a generic, symmetric, five-layer, metal/cladding/core waveguide structure using transfer matrix theory. We provide a design strategy for an efficient ultra-broadband THz emitter and apply it to polymer waveguides with a nonlinear core composed of a poled guest-host electro-optic polymer composite and pumped by a pulsed fiber laser system operating at 1567 nm. The predicted bandwidths are greater than 15 THz and we find a high conversion efficiency of 1.2 x 10(-4) W-1 by balancing both the modal phase-matching and effective mode attenuation. (c) 2013 Optical Society of America
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