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Results of research of resonant phenomena in planar periodic structuresconsisted of dielectric elements are presented. A problem of plane wavediffraction by a structure which a periodic cell is composed of two dielectricbars with different lengths has been solved. For the first time an existence ofhigh Q-factor trapped mode resonances are revealed in these structures. Themain difference of studied structure in contrast to the planar structure with asingle dielectric bar in the unit cell is appearing of a great red shift of atrapped mode resonant wavelength. The red shift is caused by strong coupling ofelectromagnetic fields in neighbor dielectric bar resonators. This property isvery attractive to design resonant periodic planar structures by using moderaterefractive index materials like semiconductors within their transparencywindow. In the near infrared band, the trapped mode resonances of periodicplanar structure with bars made of germanium have been studied. It is shownthat decreasing of structure asymmetry degree results in increasing of both redshift and Q-factor of resonance.

Giant red shift and enhancement of resonant light confinement in planar array of dielectric bars