We exploit theoretically the occurrence and tunability of photonic Blochoscillations (PBOs) in one-dimensional photonic crystals (PCs) containingnonlinear composites. Because of the enhanced third-order nonlinearity (Kerrtype nonlinearity) of composites, photons undergo oscillations inside tiltedphotonic bands, which are achieved by the application of graded external pumpelectric fields on such PCs, varying along the direction perpendicular to thesurface of layers. The tunability of PBOs (including amplitude and period) isreadily achieved by changing the field gradient. With an appropriate gradedpump AC or DC electric field, terahertz PBOs can appear and cover a terahertzband in electromagnetic spectrum.
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