Conical second harmonic generation in a two-dimensional chi(2) photonic crystal: a hexagonally poled LiTaO3 crystal.
A new type of conical second-harmonic generation was discovered in a 2D chi((2)) photonic crystal-a hexagonally poled LiTaO3 crystal. It reveals the presence of another type of nonlinear interaction-a scattering involved optical parametric generation in a nonlinear medium. Such a nonlinear interaction can be significantly enlarged in a modulated chi((2)) structure by a quasi-phase-matching process. The conical beam records the spatial distribution of the scattering signal and discloses the structure information and symmetry of the 2D chi((2)) photonic crystal.
Xu
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National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China.
Ji
S H
SH
Zhu
S N
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Yu
X Q
XQ
Sun
J
J
Wang
H T
HT
He
J L
JL
Zhu
Y Y
YY
Ming
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