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Opt Express. 2009 Jul 6;17(14):11558-64.

Engineered nonlinear photonic quasicrystals for multi-frequency terahertz manipulation.

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National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.


The interactions between electromagnetic wave and photonic quasicrystals are investigated. A terahertz (THz) source with multi-frequency modes in an optical LiTaO(3) superlattice produced by quasiperiodic (Fibonacci) domain-inverted ferroelectric material is demonstrated experimentally. Using the canonical pump-probe experimental technique, THz radiations in both forward and backward propagations are in-situ detected simultaneously. Four pronounced THz frequencies at 1.18, 0.78, 0.59 and 0.37 THz in Fourier transform spectrum are observed. The physical properties of THz waves inside quasiperiodic superlattice are discussed.

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