Owing to strong coupling between transverse-optical phonons and high-frequency terahertz waves in zinc-blende semiconductors, second-order nonlinear coefficients can be dramatically enhanced within the forbidden band of the polariton resonance. However, linear absorption in this regime is also dramatically increased. We show that transverse-pumping geometry can be exploited for achieving an efficient terahertz generation at the polariton resonance. Our estimates illustrate that pump powers as low as 100 mW are sufficient for causing the significant depletion of the pump beams.
© 2010 Optical Society of America
Original Manuscript: October 14, 2009
Revised Manuscript: November 30, 2009
Manuscript Accepted: December 8, 2009
Published: January 15, 2010
Yujie J. Ding, "Efficient generation of high-frequency terahertz waves from highly lossy second-order nonlinear medium at polariton resonance under transverse-pumping geometry," Opt. Lett. 35, 262-264 (2010)