Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3224195
Keywords
high-speed optical techniques; lithium compounds; optical dispersion; optical waveguides; phonons; polaritons; terahertz wave generation
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Funding
- ONR [N00014-06-1-0459]
- National Science Council of Taiwan [NSC-095-SAF-1-564-614-TMS]
- NSF
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We demonstrate generation of frequency-tunable, multicycle terahertz phonon-polariton waves in a LiNbO(3) slab waveguide. Because the waveguide modes show considerable phase-velocity dispersion, we are able to enhance frequency-selected narrowband terahertz waves by using femtosecond optical pulses whose intensity fronts are tilted at angles that meet the appropriate noncollinear phase-matching conditions. The pump light is spread across a large area of the crystalline waveguide within which coherent terahertz wave generation occurs, averting material damage, while yielding peak-to-peak terahertz field amplitudes in the waveguide of 50 kV/cm.
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