All-optical polarization switch in a quadratic nonlinear photonic quasicrystal

Ayelet Ganany-Padowicz*, Irit Juwiler, Ofer Gayer, Alon Bahabad, Ady Arie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present an all-optical intensity-dependent polarization switch based on cascaded three-wave-mixing interactions in a quasiperiodic quadratic nonlinear photonic crystal. The polarization switching is realized by simultaneous quasiphase matching of upconversion and downconversion processes in LiNbO 3 and achieves three orders of magnitude better efficiency than previous devices based on cascaded cubic nonlinearities. The switch allows extending mode-cleaning and mode-locking techniques to considerably lower input power. We demonstrate experimentally that a single linearly polarized 1550 nm fundamental wave generates a new fundamental wave of orthogonal polarization.

Original languageEnglish
Article number091108
JournalApplied Physics Letters
Issue number9
StatePublished - 2009


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