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We demonstrate that surface-emitting second-harmonic generation is an effective technique for evaluating domains of periodically-poled lithium niobate waveguide: domain period, linear taper, and poling depth. Such a method reaches nanoscale spatial resolution of 0.5 nm.
Tunable plasmonic bandgaps were achieved on adiabatically graded grating structures. Light of different wavelengths is “trapped” at different positions along the grating, consistent with computer simulations, thus verifying the intriguing “rainbow” trapping effect.
In the near-IR and mid-IR regions, periodically-poled LiNbO3 (PPLN) has become an extremely efficient nonlinear medium. However, since long-wavelength cutoff for LiNbO3 is 5.5 µm, the longest wavelength ever generated from such a crystal is 6.8 µm [1]. Such a limit is caused by the strong polariton resonances due to the coupling of transverse-optical phonons with electromagnetic waves, see Fig. 1(a)...
By coupling two counter-propagating fundamental beams into a LiNbO3 channel waveguide, we have generated a strong surface-emitting second-harmonic beam, with normalized conversion efficiency being enhanced by seven orders of magnitude.
Direct measurements on graded grating structures show that light of different wavelengths in the 500–700nm region is “trapped” at different positions along the grating, consistent with theoretical predictions, thus verifying the “rainbow” trapping effect.
We have demonstrated recovery of polaritonic stop-band in pressed polycrystalline CaF2 powder. Due to small sizes of CaF2 particles, we have observed evidence of severe damping of polaritonic waves at particle surfaces.
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